• DAY48SVR: Nws Storm Prediction Center Norman Ok

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Jan 10 09:41:49 2026
    ACUS48 KWNS 100941
    SWOD48
    SPC AC 100940

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0340 AM CST Sat Jan 10 2026

    Valid 131200Z - 181200Z

    ...DISCUSSION...
    A large-scale upper-level trough is forecast to develop across the
    central and eastern U.S. during the mid-week. This feature is
    forecast to move eastward toward the Atlantic Seaboard late in the
    week, as another trough takes its place further west across the
    Mississippi Valley. In response to the pattern, a large area of high
    pressure is forecast to settle into the central U.S. on Wednesday
    and move slowly across the Gulf Coast region on Thursday and Friday.
    Another large area of high pressure is forecast to move southward
    into the western and central U.S. by the weekend. As a result, the
    airmass across most of the continental U.S. during the mid to late
    week should be cold and relatively dry, suggesting thunderstorm
    development will be unlikely during the Day 4 to 8 period.

    ..Broyles.. 01/10/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Jan 11 09:47:22 2026
    ACUS48 KWNS 110947
    SWOD48
    SPC AC 110946

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0346 AM CST Sun Jan 11 2026

    Valid 141200Z - 191200Z

    ...DISCUSSION...
    A persistent large-scale upper-level trough is forecast to remain in
    the eastern U.S. during the Day 4 to 8 period. This pattern will be
    favorable for repeated cold air intrusions into the lower
    forty-eight states from mid to late week. Cold and dry surface high
    pressure will dominate across much of the nation, making conditions
    unfavorable for thunderstorm development.

    ..Broyles.. 01/11/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Jan 12 09:39:59 2026
    ACUS48 KWNS 120939
    SWOD48
    SPC AC 120938

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0338 AM CST Mon Jan 12 2026

    Valid 151200Z - 201200Z

    ...DISCUSSION...
    A persistent large-scale upper-level trough is forecast to remain
    over the east-central U.S. during the Day 4 to 8 period. This
    pattern will be favorable for repeated cold air intrusions into the
    continental U.S late this week into early next week. As a result,
    cool and dry conditions are expected to remain in place over much of
    the nation, making thunderstorm development unlikely in most areas.
    No severe threat is forecast to develop over the continental U.S.
    through early next week.

    ..Broyles.. 01/12/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Jan 12 09:55:58 2026
    ACUS48 KWNS 120955
    SWOD48
    SPC AC 120954

    Day 4-8 Convective Outlook RESENT 1
    NWS Storm Prediction Center Norman OK
    0354 AM CST Mon Jan 12 2026

    Valid 151200Z - 201200Z

    ...DISCUSSION...
    A persistent large-scale upper-level trough is forecast to remain
    over the east-central U.S. during the Day 4 to 8 period. This
    pattern will be favorable for repeated cold air intrusions into the
    continental U.S late this week into early next week. As a result,
    cool and dry conditions are expected to remain in place over much of
    the nation, making thunderstorm development unlikely in most areas.
    No severe threat is forecast to develop over the continental U.S.
    through early next week.

    ..Broyles.. 01/12/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Jan 13 09:37:05 2026
    ACUS48 KWNS 130937
    SWOD48
    SPC AC 130935

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0335 AM CST Tue Jan 13 2026

    Valid 161200Z - 211200Z

    ...DISCUSSION...
    A persistent eastern U.S large-scale upper-level trough is forecast
    to remain in place through the Day 4 to 8 period. As a result,
    northwesterly mid-level flow is forecast over much of the
    continental U.S. In response, multiple cold air intrusions are
    expected to take place across the central and eastern U.S. This will
    keep a relatively dry and cold airmass over much of the nation
    through early next week. For this reason, conditions will be
    unfavorable for thunderstorms in most areas, and a severe threat is
    not forecast in the Day 4 to 8 period.

    ..Broyles.. 01/13/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Jan 14 09:31:40 2026
    ACUS48 KWNS 140931
    SWOD48
    SPC AC 140930

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0330 AM CST Wed Jan 14 2026

    Valid 171200Z - 221200Z

    ...DISCUSSION...
    Medium-range guidance generally indicates that amplified mid-level
    troughing, evolving by late week to the east of the Rockies, will be
    maintained through this coming weekend, before a fairly prominent
    ridge near and offshore of the Pacific Northwest/British Columbia
    coast weakens and redevelops to the west/northwest. However, even
    as flow trends less amplified, it appears that a broadly confluent
    westerly to northwesterly regime to the east of the Rockies may
    continue to support a series of southeastward developing cold
    surface ridges. Toward the middle of next week, this may become
    less of an influence across the southwestern into western Gulf
    Basin, beneath a belt of strengthening mid/upper westerlies
    emanating from the subtropical eastern Pacific. It is possible that
    low-level moistening and forcing for ascent could become supportive
    of sufficient destabilization for thunderstorm development by
    Tuesday/Wednesday across the northwestern Gulf. However, it is not
    yet clear that this will impact areas inland of the Gulf coast, or
    become particularly strong.

    ..Kerr.. 01/14/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Jan 15 09:49:16 2026
    ACUS48 KWNS 150949
    SWOD48
    SPC AC 150947

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0347 AM CST Thu Jan 15 2026

    Valid 181200Z - 231200Z

    ...DISCUSSION...
    Medium-range models continue to indicate that highly amplified
    mid-level troughing will persist across much of North America (to
    the east of the Rockies) and the Gulf Basin through this coming
    weekend into early next week, when an initially prominent ridge near
    the British Columbia/Pacific Northwest coast begins to weaken and
    perhaps redevelop to the west/northwest. Thereafter, sizable spread
    remains evident within and among the various model output concerning
    shorter wavelength developments and blocking within the larger-scale
    split flow across the mid-latitude eastern Pacific, and the impacts
    on the downstream flow remain unclear.

    In general, it still appears that the Gulf Coast states and Gulf
    Basin may come under the increasing influence of a strengthening
    belt of westerlies emanating from the subtropical eastern Pacific,
    and troughing may tend to dig within the mid-latitude westerlies
    near and inland of the Pacific coast through mid to late next week.
    However, even with guidance indicating potential for modest surface cyclogenesis to the lee of the southern Rockies by the end of the
    period, it does not appear that moist return flow off a modifying
    Gulf boundary-layer will yet become supportive of appreciable inland destabilization.

    ..Kerr.. 01/15/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Jan 16 08:26:54 2026
    ACUS48 KWNS 160826
    SWOD48
    SPC AC 160825

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0225 AM CST Fri Jan 16 2026

    Valid 191200Z - 241200Z

    ...DISCUSSION...
    Broad upper troughing will persist across much of the CONUS from the
    Rockies to the Eastern Seaboard during the Day 4-8 period. Surface
    high pressure will largely keep Gulf moisture well offshore, with
    cold air intrusions into the Plains and eastern U.S. precluding much
    in the way of thunderstorm potential.

    The exception may be briefly on Day 6/Wednesday across portions of
    the Texas Coastal Plain vicinity. As a reinforcing shortwave upper
    trough ejects across the Rockies, lee surface low development over
    western TX will allow for very modest Gulf moisture to filter into south/southeast TX. A cold front will sweep south/southeast during
    the evening/overnight and isolated thunderstorms could develop.
    Severe potential appears low given modest moisture/limited
    destabilization.

    ..Leitman.. 01/16/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Jan 16 08:36:24 2026
    ACUS48 KWNS 160836
    SWOD48
    SPC AC 160834

    Day 4-8 Convective Outlook RESENT 1
    NWS Storm Prediction Center Norman OK
    0234 AM CST Fri Jan 16 2026

    Valid 191200Z - 241200Z

    ...DISCUSSION...
    Broad upper troughing will persist across much of the CONUS from the
    Rockies to the Eastern Seaboard during the Day 4-8 period. Surface
    high pressure will largely keep Gulf moisture well offshore, with
    cold air intrusions into the Plains and eastern U.S. precluding much
    in the way of thunderstorm potential.

    The exception may be briefly on Day 6/Wednesday across portions of
    the Texas Coastal Plain vicinity. As a reinforcing shortwave upper
    trough ejects across the Rockies, lee surface low development over
    western TX will allow for very modest Gulf moisture to filter into south/southeast TX. A cold front will sweep south/southeast during
    the evening/overnight and isolated thunderstorms could develop.
    Severe potential appears low given modest moisture/limited
    destabilization.

    ..Leitman.. 01/16/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Jan 17 08:56:31 2026
    ACUS48 KWNS 170856
    SWOD48
    SPC AC 170855

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0255 AM CST Sat Jan 17 2026

    Valid 201200Z - 251200Z

    ...DISCUSSION...
    Convective potential will remain low for most of the CONUS during
    the Day 4-8 period as persistent troughing envelops much of the
    country. However, a couple chances for thunderstorm activity may
    develop from TX to the Lower MS Valley vicinity on Day 5/Wed and
    possibly toward the end of the period heading into the weekend.
    These chances will occur as modified Gulf moisture impinges on the
    TX coastal vicinity on Wednesday as an upper trough moves across the
    Plains toward the MS Valley. Moisture return, in response to a
    developing low in the lee of the southern Rockies, will remain
    shallow, but could be sufficient for isolated thunderstorms across
    portions of southeast TX into LA Wednesday afternoon into early
    Thursday morning.

    Some guidance suggests a weak upper shortwave trough and enhanced
    southwesterly flow could overspread the Gulf Basin during the
    weekend, bringing some deeper boundary layer moisture into portions
    of the western and central Gulf coast states. However, guidance
    varies considerably and run-to-run consistency is poor.

    ..Leitman.. 01/17/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Jan 18 08:47:07 2026
    ACUS48 KWNS 180847
    SWOD48
    SPC AC 180845

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0245 AM CST Sun Jan 18 2026

    Valid 211200Z - 261200Z

    ...DISCUSSION...
    A large-scale upper trough will develop eastward across the Plains
    and eastern U.S. on Days 4-5/Wed-Thu. As this occurs, some modest
    Gulf moisture will spread across east TX toward the Lower MS Valley
    ahead of a cold front. Some low potential for thunderstorms will be
    possible, but the modest moisture return will limit instability and
    severe potential is low.

    Beyond Day 5/Thu, forecast guidance is not in very good agreement
    with large spread resulting in greater than normal uncertainty. The
    control member of the ECMWF appears to be an outlier, showing some
    increasing severe potential across the Gulf Coast states toward the
    end of the forecast period. However, the GFS and EC-AIFS keep any
    Gulf moisture offshore, precluding severe potential. Given these
    large model discrepancies, severe probabilities seem low for now.

    ..Leitman.. 01/18/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Jan 19 09:32:45 2026
    ACUS48 KWNS 190932
    SWOD48
    SPC AC 190931

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0331 AM CST Mon Jan 19 2026

    Valid 221200Z - 271200Z

    ...DISCUSSION...
    Severe potential is expected to be low during the Day 4-8 period.
    Some modest Gulf moisture will impinge on the coastal regions from
    TX into MS/AL/FL beginning Day 4/Thu. Warm advection will allow for
    showers and perhaps isolated thunderstorms, but weak forcing for
    ascent and only very minor instability will preclude severe
    potential. By Day 5-6/Fri-Sat, a deepening upper trough over the
    western U.S. will develop east across portions of the Plains and
    Midwest. A strong arctic cold front will move across the middle of
    the country, ushering in another punch of cold to very cold air and
    once again shunting Gulf moisture offshore. Some thunderstorm
    activity could occur ahead of this front across the Gulf coast
    states, but deeper moisture return is not expected and will be
    insufficient for severe storms. Surface high pressure and a
    cold/stable airmass will persist over much of the CONUS behind the
    arctic cold front on Days 7-8/Sun-Mon.

    ..Leitman.. 01/19/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Jan 20 08:53:51 2026
    ACUS48 KWNS 200853
    SWOD48
    SPC AC 200852

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0252 AM CST Tue Jan 20 2026

    Valid 231200Z - 281200Z

    ...DISCUSSION...
    An arctic airmass will settle across much of the CONUS east of the
    Rockies on Days 4-5/Fri-Sat. Resulting strong high pressure and
    cold/dry/stable conditions will persist over much of the country
    throughout the period. However, some thunderstorm potential could
    develop across portions of the Gulf Coast states/Southeast on Days
    4-6/Fri-Sun as a surface cold front progresses east/southeast.
    Modified Gulf moisture will be in place near the immediate Gulf
    Coast. Warm advection in the low-levels could result in isolated
    thunderstorms near or just to the cool side of the cold front Friday
    afternoon across parts of TX, spreading east/northeast across the
    Southeast through Saturday and early Sunday. Instability should
    remain weak as better moisture remains offshore, and due to
    convection becoming undercut by the cold front.

    ..Leitman.. 01/20/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Jan 21 08:37:27 2026
    ACUS48 KWNS 210837
    SWOD48
    SPC AC 210835

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0235 AM CST Wed Jan 21 2026

    Valid 241200Z - 291200Z

    ...DISCUSSION...
    A large-scale upper trough will shift from the Rockies through the
    central and eastern CONUS Days 4-6/Sat-Mon. As this occurs, a very
    cold airmass will overspread much of the country, with a swath of
    winter precipitation expected to spread from the southern Plains
    through the Mid-Atlantic. At the surface, model guidance varies, but
    a deepening low is expected to develop over the central Gulf Coast
    vicinity on Saturday night/early Sunday. The low and trailing cold
    front will move offshore the Atlantic coast by early Monday.
    Depending how far north the surface low develops, some thunderstorm
    potential could increase across parts of the central Gulf Coast and
    the FL Panhandle on Sunday. However, severe storms appear unlikely.
    The very cold airmass settling over much of the country during the
    weekend is likely to persist into early next week, precluding
    thunderstorm potential through the end of the period.

    ..Leitman.. 01/21/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Jan 22 08:56:48 2026
    ACUS48 KWNS 220856
    SWOD48
    SPC AC 220855

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0255 AM CST Thu Jan 22 2026

    Valid 251200Z - 301200Z

    ...DISCUSSION...
    A surface low over the Deep South on Day 4/Sunday morning will
    develop east/northeast through early Monday, moving offshore the
    Carolinas coast. As this occurs, an arctic cold front will continue
    to push southeast across the Southeast U.S. Ahead of the front,
    modified Gulf moisture will be in place, supporting weak
    instability. As an upper trough approaches, large-scale ascent and
    warm advection atop the surface front will support isolated
    thunderstorms across southern MS/AL into northern FL and southern
    GA. Modest instability and poor lapse rates should limit severe
    potential within the warm sector.

    By Day 5/Monday, the cold front will have moved well offshore the
    Gulf and Atlantic coasts and an arctic airmass will envelop much of
    the CONUS. Mean troughing is forecast to persist, allowing
    reinforcing shots of colder air to filter southward east of the
    Rockies and preclude any return flow across the Gulf basin.

    ..Leitman.. 01/22/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Jan 23 09:55:17 2026
    ACUS48 KWNS 230955
    SWOD48
    SPC AC 230953

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0353 AM CST Fri Jan 23 2026

    Valid 261200Z - 311200Z

    ...DISCUSSION...
    Amplified mid-level flow will persist over the US through next week
    with troughing generally over the East and a building ridge to the
    West. This will favor continued northwesterly flow aloft and
    reinforcement of an extensive cold air outbreak and Arctic high
    pressure over the lower 48. With little to no inland moisture
    transport expected over the next week, severe weather is unlikely.

    ..Lyons.. 01/23/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Jan 24 09:58:03 2026
    ACUS48 KWNS 240957
    SWOD48
    SPC AC 240956

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0356 AM CST Sat Jan 24 2026

    Valid 271200Z - 011200Z

    ...DISCUSSION...
    Amplified mid-level flow will persist over the US through the
    remainder of the extended forecast period. Continued troughing in
    the eastern US will be supported by the arrival of multiple
    perturbations from southern Canada over the next week. At the same
    time, strong ridging developing over the West will favor
    northwesterly flow aloft over the central States. This will allow
    for multiple reinforcing surges of cold air to replenish a cold, dry
    and stable air mass. Thus, severe thunderstorms are unlikely through
    day 8.

    ..Lyons.. 01/24/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Jan 25 09:50:35 2026
    ACUS48 KWNS 250950
    SWOD48
    SPC AC 250948

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0348 AM CST Sun Jan 25 2026

    Valid 281200Z - 021200Z

    ...DISCUSSION...
    Severe weather concerns are negligible for the extended forecast
    period. Continued eastern US troughing, reinforced by northwesterly
    flow out of southern Canada will replenish a cold, dry and stable
    air mass underneath Arctic high Pressure. While some surface
    cyclogenesis appears possible over the eastern Gulf and Atlantic
    coast into next weekend, offshore winds should preclude robust
    moisture return, negating any thunderstorm or severe risk for the
    next several days.

    ..Lyons.. 01/25/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Jan 26 10:00:44 2026
    ACUS48 KWNS 261000
    SWOD48
    SPC AC 260958

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0358 AM CST Mon Jan 26 2026

    Valid 291200Z - 031200Z

    ...DISCUSSION...
    Severe weather is unlikely through the extended forecast period. A
    robust Arctic air mass associated with continued troughing over the
    eastern US will be reinforced by several additional perturbations
    moving out of Canada and a building western US ridge. As the flow
    pattern aloft amplifies, surface cyclogenesis appears possible over
    the eastern Gulf and Atlantic seaboard this weekend, further
    increasing offshore flow and limiting substantial inland moisture return/destabilization. Thus, thunderstorm potential appears
    negligible through the extended forecast period.

    ..Lyons.. 01/26/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Jan 27 09:51:49 2026
    ACUS48 KWNS 270951
    SWOD48
    SPC AC 270950

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0350 AM CST Tue Jan 27 2026

    Valid 301200Z - 041200Z

    ...DISCUSSION...
    Severe weather potential in the extended forecast period is very
    low. Broad-scale eastern US troughing will strengthen this weekend
    as a clipper-style trough dives out of Canada an rapidly intensifies
    along the Eastern Seaboard. A surface low will develop over the
    eastern Gulf and rapidly deepen over the western Atlantic into early
    next week. Western US ridging and strong surface high pressure over
    the central US will keep substantial inland moisture return unlikely
    for the foreseeable future.

    ..Lyons.. 01/27/2026

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Jan 28 09:57:24 2026
    ACUS48 KWNS 280957
    SWOD48
    SPC AC 280956

    Day 4-8 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0356 AM CST Wed Jan 28 2026

    Valid 311200Z - 051200Z

    ...DISCUSSION...
    Severe weather is unlikely through the extended forecast period. A
    highly amplified mid-level flow pattern over the CONUS will continue
    through this weekend and into the first part of next week. A
    prominent upper low will amplify over the East Coast as a strong
    surface cyclone develops offshore. Ridging over the western US will
    support strong high pressure and a cold/dry continental air mass
    over much of the US. This will largely suppress inland moisture
    transport, outside of far south FL, and subsequent thunderstorm
    potential for the next several days.

    ..Lyons.. 01/28/2026

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