• DAY48SVR: Nws Storm Prediction Center Norman Ok

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Aug 10 08:25:48 2025
    ACUS48 KWNS 100825
    SWOD48
    SPC AC 100824

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0324 AM CDT Sun Aug 10 2025

    Valid 131200Z - 181200Z

    ...DISCUSSION...
    From Wednesday/D4 into Thursday/D5, a shortwave trough is forecast
    to move from the Pacific Northwest across MT and over the far
    northern Plains, with an upper speed max developing into southern SK
    and MB. In advance of this trough, a leading trough affecting the
    Great Lakes region will also lift northeastward, with height rises
    and a warming pattern across parts of the Plains and upper Midwest.
    The combination of increasing dewpoints and the upper trough
    glancing the region may result in some manner of severe risk late
    Thursday/D5, and most likely from parts of ND into northern MN, and
    in evening/overnight MCS form. Future model trends will be monitored
    for a possible risk area.

    From Friday/D6 onward, predictability decreases with the motion of
    the aforementioned upper wave. However, large instability is likely
    to again build across the Mid MO/Upper MS Valleys, and at least
    sporadic severe storms cannot be ruled out from the northern High
    Plains eastward toward the Upper Great Lakes.

    ..Jewell.. 08/10/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Aug 11 08:53:28 2025
    ACUS48 KWNS 110853
    SWOD48
    SPC AC 110852

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0352 AM CDT Mon Aug 11 2025

    Valid 141200Z - 191200Z

    ...DISCUSSION...
    On Thursday/D4, a shortwave trough is forecast to move from MT into
    the northern Plains, with primary upper low well to the north. A
    surface trough and cold front should push eastward across the
    Dakotas as well, and extend roughly from MN into NE by Friday/D5
    morning. Model spread is high regarding the amount of moisture
    return and instability, with some models likely over-estimating real instability. In any case, storms appear most likely from ND into
    northern MN, beneath 50+ kt midlevel westerlies. As such, a 15%
    severe area has been introduced.

    This wave will progress east/northeastward on Friday/D5, with a
    front trailing southwestward perhaps from Lake Superior across WI/MN
    and toward NE. A moist and unstable air mass will remain near and
    south of any such boundary, but the position of said boundary may
    depend on storms from the previous night, or possibly a continuation
    of such storms. Predictability is therefore low on Friday/D5.

    Beyond this time frame, it appears the storm track will shift
    northward into Canada, with upper ridging over much of the CONUS.

    ..Jewell.. 08/11/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Aug 12 08:12:32 2025
    ACUS48 KWNS 120812
    SWOD48
    SPC AC 120811

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0311 AM CDT Tue Aug 12 2025

    Valid 151200Z - 201200Z

    ...DISCUSSION...
    From Friday/D4 into Saturday/D5, an upper low will move from
    Manitoba across Hudson Bay and into Quebec. Moderate midlevel
    westerlies will exist over the far northern Plains to Upper Great
    Lakes during this period, with gradual weakening. An upper high will
    also be centered over the mid MS Valley, while a weak midlevel
    trough with cool air aloft slowly departs the Great Basin.

    At the surface, a front is forecast to stall on Friday/D4 from
    northern NE across southern MN and into northern WI, with a moist
    and unstable air mass remaining to the south. This front will remain
    over roughly the same zone into Saturday/D5, and perhaps as late as
    Sunday/D6.

    Given that the moist and unstable air mass will persist over parts
    of the northern Plains/Upper MS Valley, and minor ripples in the
    flow are hinted at by several models, areas of storms are expected.
    However, storm/MCS corridors are difficult to pinpoint this far out.
    In general, the area from SD into WI will bear watching for wind
    potential.

    From Sunday/D6 onward, an upper ridge is expected to build over much
    of the western and central states, with a reduction in severe
    potential overall.

    ..Jewell.. 08/12/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Aug 13 08:47:20 2025
    ACUS48 KWNS 130846
    SWOD48
    SPC AC 130844

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0344 AM CDT Wed Aug 13 2025

    Valid 161200Z - 211200Z

    ...DISCUSSION...
    During the Saturday/D4 to Sunday/D5 time frame, a weak midlevel wave
    may affect the far northern Plains to upper Great Lakes, rounding
    the building upper ridge. Meanwhile, a boundary will exist roughly
    from ND/MN into MI, with latitudinal uncertainty. A moist air mass
    will remain across this zone, with periodic storm complexes
    possible. Predictability is low but at least some wind risk may
    develop across portions of this zone.

    For the rest of the period through at least Wednesday/D8, a large
    upper ridge is forecast to build over much of the West/Rockies, with
    minimal severe risk.

    ..Jewell.. 08/13/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Aug 14 08:29:34 2025
    ACUS48 KWNS 140828
    SWOD48
    SPC AC 140826

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0326 AM CDT Thu Aug 14 2025

    Valid 171200Z - 221200Z

    ...DISCUSSION...
    An upper ridge is forecast to build over the Plains and Rockies
    through Tuesday/D6, with the upper high retrograding from the
    central Plains to the Four Corners. East of the ridge axis,
    northwest midlevel flow of 20-30 kt will persist over the upper MS
    Valley/Great Lakes, with a large area of moisture and instability
    roughly from MN/IA to IL/IN. This pattern should support corridors
    of thunderstorms in the low-level warm advection zone, or along the
    northern instability gradient through Tuesday/D6. While areas of
    strong wind gusts will be possible, the overall severe probably is
    less than the 15% threshold over this large zone.

    The upper ridge may flatten over the northern Rockies/Plains beyond
    D6, with perhaps an eventual northwest flow regime coinciding with
    residual instability, supporting at least minimal severe potential
    over the northern Plains.

    ..Jewell.. 08/14/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Aug 15 08:47:23 2025
    ACUS48 KWNS 150845
    SWOD48
    SPC AC 150844

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0344 AM CDT Fri Aug 15 2025

    Valid 181200Z - 231200Z

    ...DISCUSSION...
    ...Monday/Day 4 to Wednesday/Day 6...
    At mid-levels, heights are forecast to rise across the north-central
    states on Monday and Tuesday, as west-northwesterly flow remains
    from parts of the northern Plains to the Eastern Seaboard.
    Thunderstorm development will be possible each day along parts of a
    front, which is forecast to be slow-moving and situated from the
    northern Plains east-southeastward into the southern Great Lakes. An
    isolated severe threat will be possible in the vicinity of the front
    within a moderately unstable airmass on Monday from parts of South
    Dakota eastward into the western Great Lakes. Storms with an
    isolated severe threat will again be possible on Tuesday. The
    greatest convective coverage is forecast to be further to the east
    from the southern Great Lakes into the central Appalachians.

    On Wednesday, isolated to scattered thunderstorms are expected over
    parts of the mid Mississippi and lower Ohio Valleys. In this area,
    large-scale ascent and deep-layer shear are forecast to be weak
    suggesting the potential for severe storms will remain low.

    ...Thursday/Day 7 and Friday/Day 8...
    On Thursday, a cold front is forecast to move into the northern
    Plains. Thunderstorm development will be possible ahead of the front
    along an axis of instability from parts of South Dakota into
    northwestern Minnesota. An isolated severe threat may develop with
    this activity during the afternoon and evening. The potential for
    isolated severe is forecast to shift southeastward into the mid
    Missouri upper Mississippi Valleys on Friday. However, uncertainty
    is low at this range in the forecast period.

    ..Broyles.. 08/15/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Aug 16 08:58:40 2025
    ACUS48 KWNS 160857
    SWOD48
    SPC AC 160856

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0356 AM CDT Sat Aug 16 2025

    Valid 191200Z - 241200Z

    ...DISCUSSION...
    ...Tuesday/Day 4 and Wednesday/Day 5...
    A mid-level ridge will build across the Rockies and northern High
    Plains during the middle part of the week. At the surface, a front
    will advance slowly southward into the lower Missouri and mid
    Mississippi Valleys. A post-frontal airmass will remain over the
    upper Mississippi and Great Lakes region. On the southern and
    western periphery of this airmass, moderate instability is forecast
    to develop each afternoon. Limited large-scale ascent is expected to
    keep convective coverage isolated. In spite of relatively weak
    deep-layer shear along much of the instability corridor, steep low
    to mid-level lapse rates will be in place and could be enough for a
    marginal severe threat in areas that destabilize the most.

    ...Thursday/Day 6 and Saturday/Day 8...
    Mid-level zonal flow is forecast to develop on Thursday over much of
    the north-central and northwestern U.S., as a ridge moves
    southeastward into the western Great Lakes. A pocket of moderate
    instability is forecast to develop ahead of a cold front on Thursday
    in the northern Plains. Limited large-scale ascent should keep
    convective coverage isolated. Although deep-layer shear is forecast
    to be modest, any cell that can develop and persist near the
    stronger instability in the late afternoon and early evening could
    obtain an isolated severe threat.

    On Friday an Saturday, a cold front is forecast to move
    southeastward across the north-central U.S. Near and ahead of the
    front, isolated thunderstorms will be possible each afternoon from
    the upper Mississippi Valley into the Great Lakes region. The
    combination of instability and shear could be sufficient for an
    isolated severe threat. However, considerable uncertainty exists at
    this range in the forecast.

    ..Broyles.. 08/16/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Aug 17 08:55:40 2025
    ACUS48 KWNS 170855
    SWOD48
    SPC AC 170854

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0354 AM CDT Sun Aug 17 2025

    Valid 201200Z - 251200Z

    ...DISCUSSION...
    ...Wednesday/Day 4 to Friday/Day 6...
    On Wednesday, a mid-level ridge will likely be in place across the
    northern Plains. At the surface, a front is forecast to be located
    over the Ozarks and lower Ohio Valley. Moderate instability is
    expected to develop to the south of the front, and over parts of the north-central states. In areas where storms are expected, deep-layer
    shear should be weak, suggesting a severe threat is unlikely.

    On Thursday, a mid-level shortwave trough and an associated cold
    front are forecast to move eastward into the northern Plains. An
    axis of moderate instability is forecast ahead of the front. This
    combined with moderate deep-layer shear could be enough for an
    isolated severe threat during the afternoon and evening, mainly over
    eastern North Dakota and northwestern Minnesota.

    The front and its associated shortwave trough are forecast to move
    into the upper Mississippi and mid Missouri Valleys on Friday.
    Moderate instability appears likely to develop ahead of the front
    during the afternoon. Along and near the instability axis, the
    greatest potential for thunderstorm development could occur in the
    central Plains within northwest mid-level flow. An isolated severe
    threat will be possible during the late afternoon and early evening.

    ...Saturday/Day 7 and Sunday/Day 8...
    On Saturday and Sunday, an upper-level trough is forecast to remain
    over the Great Lakes region. Ahead of the trough, an axis of
    instability is forecast to develop in the central Appalachians,
    where isolated to scattered thunderstorms will be possible each
    afternoon. Moderate deep-layer shear could be sufficient for an
    isolated wind-damage threat, mainly in the late afternoon as
    low-level lapse rates become steep.

    ..Broyles.. 08/17/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Aug 18 08:54:18 2025
    ACUS48 KWNS 180854
    SWOD48
    SPC AC 180852

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0352 AM CDT Mon Aug 18 2025

    Valid 211200Z - 261200Z

    ...DISCUSSION...
    ...Thursday/Day 4 to Saturday/Day 6...
    On Thursday, a subtle shortwave trough is forecast to move eastward
    across the northern Plains. An axis of moderate instability will
    likely develop by afternoon ahead of the front across the eastern
    Dakotas and northwest Minnesota. Scattered storms could develop
    during the afternoon near the instability axis, with an isolated
    severe threat possible.

    On Friday, the front is forecast to move southeastward toward the
    upper Mississippi and mid Missouri Valleys, as an axis of
    instability develops during the afternoon. Isolated thunderstorms
    will be possible near the instability axis, but the severe potential
    is expected to remain localized, mostly due to minimal convective
    coverage.

    On Saturday, the front is forecast to move across the Great Lakes
    region, extending west-southwestward into the central U.S. Isolated
    storms with a potential for localized severe will again be possible
    in the afternoon ahead of the front. Due to a lack of large-scale
    ascent, cell coverage is expected to be very isolated.

    ...Sunday/Day 7 and Monday/Day 8...
    From Sunday into Monday, an upper-level trough and an associated
    cold front is forecast to move across the eastern U.S. Thunderstorm
    development will be possible ahead of the front Sunday afternoon in
    the central Appalachians, and along parts of the middle to upper
    Atlantic Seaboard on Monday afternoon. Instability ahead of the
    front is expected to remain weak in most areas during this period,
    suggesting any severe threat will remain localized.

    ..Broyles.. 08/18/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Aug 19 08:52:58 2025
    ACUS48 KWNS 190850
    SWOD48
    SPC AC 190849

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0349 AM CDT Tue Aug 19 2025

    Valid 221200Z - 271200Z

    ...DISCUSSION...
    ...Friday/Day 4 to Sunday/Day 6...
    On Friday, a mid-level shortwave trough and an associated cold front
    is forecast to move into the upper Mississippi Valley. An axis of
    moderate instability will likely develop by afternoon ahead of the
    front from the western Great Lakes southwestward into the mid
    Missouri Valley. Due to limited large-scale ascent, convective
    coverage near the instability axis is expected to be very isolated.
    A marginal risk will be possible with cells that develop close
    enough to the instability axis.

    On Saturday, the front is forecast to move through the Great Lakes
    region, extending southward into the central Plains. Instability
    will again develop ahead of the front, but convective initiation
    should remain isolated due to a lack of large-scale ascent. The area
    with the greatest potential for a marginal severe threat would be
    over the central Great Lakes ahead of a shortwave trough.

    The shortwave trough is forecast to amplify over the Great Lakes
    region on Sunday, as the cold front advances through the lower Great
    Lakes and Ohio Valley. Instability will increase during the day
    ahead of the front over the central Appalachians with scattered
    thunderstorms developing during the afternoon. Deep-layer shear
    should be strong enough for an isolated wind-damage threat, mainly
    in areas where instability is stronger.

    ...Monday/Day 7 and Tuesday/Day 8...
    A cold front is forecast to advance towards the Eastern Seaboard on
    Monday. Scattered thunderstorms will be possible Monday afternoon
    ahead of the front from New England southward into the Mid-Atlantic.
    Although moderate deep-layer shear is forecast, instability should
    remain weak, suggesting any severe threat will be marginal. Although uncertainty is substantial at this extended range, the models keep a
    relatively dry post-frontal airmass over much of the central and
    eastern U.S on Tuesday. Along the southern periphery of this
    airmass, isolated thunderstorms will be possible in the southern
    Plains and Ark-La-Tex Tuesday afternoon. However, weak instability
    is expected to limit severe threat potential.

    ..Broyles.. 08/19/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Aug 20 08:05:04 2025
    ACUS48 KWNS 200804
    SWOD48
    SPC AC 200803

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0303 AM CDT Wed Aug 20 2025

    Valid 231200Z - 281200Z

    ...DISCUSSION...
    ...D4/Saturday - D6/Monday...
    On D4/Saturday, a seasonably strong cold front will move across
    parts of the south-central Great Plains into the mid MS Valley and
    southern Great Lakes region, as a deep mid/upper-level trough
    becomes established over much of the central/eastern CONUS. Somewhat
    favorable deep-layer flow/shear could support strong to locally
    severe storms along the front, though generally modest instability
    may tend to limit the magnitude of the severe threat. Strong storms
    may also develop within a post-frontal regime across parts of the
    central High Plains.

    The cold front will make further south/east progress on D5/Sunday,
    and locally strong storms may develop from parts of the Northeast
    into the central/southern Appalachians. Generally weak instability
    may tend to limit coverage of the organized severe threat. Strong
    storms may also develop again within a post-frontal regime across
    parts of the central/southern High Plains.

    The cold front may tend to slow down by D6/Monday across parts of
    the Mid Atlantic and Northeast, though guidance begins to diverge
    regarding the evolution of the deep upper trough and potential for
    surface low development off of the Mid Atlantic coast. Some
    potential for strong storms could again evolve along the front, from
    parts of New England into the Mid Atlantic.

    ...D7/Tuesday - D8/Wednesday...
    While predictability continues to wane regarding the details,
    extended-range guidance generally depicts persistence of the eastern
    CONUS upper trough into the middle of next week, though it may begin
    to shift eastward with time. In the wake of the cold frontal
    passage, an expansive surface ridge is forecast to maintain
    generally stable conditions for most areas east of the Rockies,
    resulting in limited potential for organized severe storms.

    ..Dean.. 08/20/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Aug 21 08:11:10 2025
    ACUS48 KWNS 210811
    SWOD48
    SPC AC 210809

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0309 AM CDT Thu Aug 21 2025

    Valid 241200Z - 291200Z

    ...DISCUSSION...
    ...D4/Sunday - D5/Monday...
    A cold front that moves into the eastern CONUS on Sunday may tend to
    slow down, as a reinforcing shortwave moves through the base of a
    deep mid/upper-level trough covering the region. Scattered storms
    will be possible from the Northeast into the central/southern
    Appalachians on D4/Sunday, though with only modest instability and
    deep-layer shear forecast to be in place, any severe potential may
    remain isolated. Stronger deep-layer flow/shear is generally
    forecast to overspread parts of the Northeast/New England on
    D5/Monday, though with generally weak instability expected, severe
    potential is uncertain.

    Scattered storms will also be possible on Sunday and Monday across
    the CO Front Range vicinity into the central High Plains, within a
    persistent post-frontal regime. While details are uncertain, strong
    to isolated severe storms cannot be ruled out, especially if any
    organized clustering can develop and emerge into parts of the High
    Plains.

    ...D6/Tuesday - D8/Thursday...
    While typical model spread is noted by Days 6-8, guidance generally
    depicts relatively limited severe potential into the middle of next
    week, as an expansive surface ridge suppresses richer low-level
    moisture to parts of the Gulf Coast and Texas. Some guidance shows
    potential for recovery by D8/Thursday across parts of the
    southern/central Plains, but deep-layer flow is generally forecast
    to remain weak to modest across the region.

    ..Dean.. 08/21/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Aug 22 08:48:15 2025
    ACUS48 KWNS 220848
    SWOD48
    SPC AC 220846

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0346 AM CDT Fri Aug 22 2025

    Valid 251200Z - 301200Z

    ...DISCUSSION...
    ...Monday/Day 4 to Wednesday/Day 6...
    On Monday, a cyclonic-flow mid-level pattern will be in place across
    much of the eastern two-thirds of the nation. Southwesterly flow is
    expected over the Northeast, where scattered thunderstorms will be
    possible on Monday, mainly in New England. Scattered storms are also
    expected to develop in parts of the southern and central Plains
    within northwesterly flow. Any severe threat in these two areas will
    likely remain localized, mainly due to weak instability.

    On Tuesday and Wednesday, a large area of high pressure is forecast
    to be in place from the central and northern Plains eastward to the
    Atlantic Seaboard. Thunderstorms, non severe in nature, would be
    possible each afternoon across parts of the Gulf Coast states and in
    the southern and central High Plains, along the southern and western
    periphery of the post-frontal airmass.

    ...Thursday/Day 7 and Friday/Day 8...
    From Thursday into Friday, a mid-level low is forecast to form over
    the lower Great Lakes, as a large area of surface high pressure
    moves slowly eastward across the eastern U.S. Scattered
    thunderstorms could form in parts of the southern Plains and High
    Plains, but weak instability should limit any severe potential.

    ..Broyles.. 08/22/2025

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Aug 23 08:38:19 2025
    ACUS48 KWNS 230838
    SWOD48
    SPC AC 230836

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0336 AM CDT Sat Aug 23 2025

    Valid 261200Z - 311200Z

    ...DISCUSSION...
    ...Tuesday/Day 4 to Thursday/Day 6...
    A large-scale trough will remain in place across the eastern U.S. on
    Tuesday, as an area of surface high pressure remains dominant across
    much of the eastern half of the nation. Non-severe thunderstorms may
    develop on the western periphery of post-frontal airmass, over parts
    of the southern and central High Plains on Tuesday and Wednesday.

    On Thursday, low-level moisture return is forecast to take place
    across the southern and central Plains. A pocket of moderate
    instability will be possible across parts of Oklahoma, where
    scattered thunderstorms may develop during the afternoon. In spite
    of this, deep-layer shear is forecast to remain relatively weak,
    suggesting any severe threat will be marginal.

    ...Friday/Day 7 and Saturday/Day 8...
    From Friday into Saturday, northwesterly mid-level flow will remain
    in place over parts of much of the central and eastern part of the
    nation. At the surface, a moist airmass will likely be located over
    parts of the Gulf Coast states, where scattered thunderstorms will
    be possible each day. Deep-layer shear is forecast be relatively
    weak across most of the region from Friday into Saturday, suggesting
    that any severe threat will remain localized.

    ..Broyles.. 08/23/2025

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