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  1. WW 307 SEVERE TSTM IA NE 240335Z - 241000Z
    WW 0307 Image
    
    URGENT - IMMEDIATE BROADCAST REQUESTED
    Severe Thunderstorm Watch Number 307
    NWS Storm Prediction Center Norman OK
    1035 PM CDT Wed Jun 23 2021
    
    The NWS Storm Prediction Center has issued a
    
    * Severe Thunderstorm Watch for portions of 
      Far western Iowa
      Central to eastern Nebraska
    
    * Effective this Wednesday night and Thursday morning from 1035
      PM until 500 AM CDT.
    
    * Primary threats include...
      Scattered damaging winds and isolated significant gusts to 90
        mph likely
      Scattered large hail and isolated very large hail events to 2
        inches in diameter possible
    
    SUMMARY...A forward-propagating cluster will likely develop
    east-southeast from ongoing cells across north-central Nebraska,
    spreading into eastern Nebraska and far western Iowa overnight.
    Intense severe wind gusts are possible.
    
    The severe thunderstorm watch area is approximately along and 65
    statute miles north and south of a line from 35 miles northwest of
    Broken Bow NE to 20 miles northeast of Omaha NE. For a complete
    depiction of the watch see the associated watch outline update
    (WOUS64 KWNS WOU7).
    
    PRECAUTIONARY/PREPAREDNESS ACTIONS...
    
    REMEMBER...A Severe Thunderstorm Watch means conditions are
    favorable for severe thunderstorms in and close to the watch area.
    Persons in these areas should be on the lookout for threatening
    weather conditions and listen for later statements and possible
    warnings. Severe thunderstorms can and occasionally do produce
    tornadoes.
    
    &&
    
    OTHER WATCH INFORMATION...CONTINUE...WW 306...
    
    AVIATION...A few severe thunderstorms with hail surface and aloft to
    2 inches. Extreme turbulence and surface wind gusts to 80 knots. A
    few cumulonimbi with maximum tops to 600. Mean storm motion vector
    29040.
    
    ...Grams
    
    
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  2. WW 0307 Status Updates
    WW 0307 Status Image
    
    STATUS REPORT ON WW 307
    
    SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 NE LBF TO
    10 SSE ONL TO 30 W SLB.
    
    ..BROYLES..06/24/21
    
    ATTN...WFO...OAX...FSD...LBF...GID...
    
    
    STATUS REPORT FOR WS 307 
    
    SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 
    
    IAC071-085-129-133-155-193-240640-
    
    IA 
    .    IOWA COUNTIES INCLUDED ARE
    
    FREMONT              HARRISON            MILLS               
    MONONA               POTTAWATTAMIE       WOODBURY            
    
    
    NEC003-011-019-021-023-025-037-039-041-043-053-055-071-077-079-
    081-093-109-119-121-125-131-139-141-143-153-155-159-163-167-173-
    175-177-179-183-185-240640-
    
    NE 
    .    NEBRASKA COUNTIES INCLUDED ARE
    
    ANTELOPE             BOONE               BUFFALO             
    BURT                 BUTLER              CASS                
    COLFAX               CUMING              CUSTER              
    DAKOTA               DODGE               DOUGLAS             
    GARFIELD             GREELEY             HALL                
    HAMILTON             HOWARD              LANCASTER           
    MADISON              MERRICK             NANCE               
    OTOE                 PIERCE              PLATTE              
    POLK                 SARPY               SAUNDERS            
    
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  3. WW 0306 Status Updates
    WW 0306 Status Image
    
    STATUS REPORT ON WW 306
    
    SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 NNE SNY
    TO 35 W MHN TO 35 NW MHN TO 40 W VTN.
    
    ..LYONS..06/24/21
    
    ATTN...WFO...LBF...
    
    
    STATUS REPORT FOR WS 306 
    
    SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 
    
    NEC005-009-015-017-031-041-049-069-071-075-089-091-101-103-111-
    113-115-117-149-171-183-240340-
    
    NE 
    .    NEBRASKA COUNTIES INCLUDED ARE
    
    ARTHUR               BLAINE              BOYD                
    BROWN                CHERRY              CUSTER              
    DEUEL                GARDEN              GARFIELD            
    GRANT                HOLT                HOOKER              
    KEITH                KEYA PAHA           LINCOLN             
    LOGAN                LOUP                MCPHERSON           
    ROCK                 THOMAS              WHEELER             
    
    
    THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY.  PLEASE
    REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
    INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
    CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
    
    
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  4. MD 1073 CONCERNING SEVERE THUNDERSTORM WATCH 307... FOR EASTERN NEBRASKA...FAR NORTHEAST KANSAS...NORTHWEST MISSOURI...SOUTHWEST IOWA
    MD 1073 Image
    
    Mesoscale Discussion 1073
    NWS Storm Prediction Center Norman OK
    0136 AM CDT Thu Jun 24 2021
    
    Areas affected...Eastern Nebraska...Far Northeast Kansas...Northwest
    Missouri...Southwest Iowa
    
    Concerning...Severe Thunderstorm Watch 307...
    
    Valid 240636Z - 240830Z
    
    The severe weather threat for Severe Thunderstorm Watch 307
    continues.
    
    SUMMARY...A potential for wind damage, isolated large hail and a
    brief tornado will likely continue for several more hours. As the
    MCS in northeast Nebraska moves southeastward toward the edge of
    weather watch 307, a new watch will need to be considered.
    
    DISCUSSION...The latest high-resolution radar imagery from Omaha
    shows a well-developed bowing line segment located in northeast
    Nebraska. A pronounced surface high-low couplet is evident behind
    the bowing segment. Surface dewpoints ahead of the line are
    generally in the lower 70s F, which is contributing to strong
    instability. The RAP is analyzing a pocket of MLCAPE between 4000
    and 4500 J/Kg. In addition, the Omaha WSR-88D VWP shows strong
    directional shear in the low-levels with some speed shear in the mid
    to upper levels. This wind profile along with a strong rear inflow
    jet will continue support the bowing line segment as it moves
    quickly southeastward across eastern Nebraska over the next couple
    of hours. Wind damage will be likely along the leading edge with
    wind gusts above 70 knots possible. Recently, the BVN observing site
    reported a wind gust at 73 knots. Large hail and a brief tornado
    will also be possible with the more intense rotating cells embedded
    in the line. The line is expected to exit weather watch 307 by 09Z.
    As it approaches the edge of the watch, a new watch will need to be
    considered further downstream.
    
    ..Broyles/Edwards.. 06/24/2021
    
    ...Please see www.spc.noaa.gov for graphic product...
    
    ATTN...WFO...DMX...EAX...OAX...TOP...GID...
    
    LAT...LON   41569496 41919625 42079740 41919794 41539859 41219852
                40639779 40129703 39559597 39349525 39329462 39849402
                40379381 40849411 41569496 
    
    
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  5. SPC 1200Z Day 1 Outlook
    Day 1 Outlook Image
    Day 1 Convective Outlook  
    NWS Storm Prediction Center Norman OK
    0100 AM CDT Thu Jun 24 2021
    
    Valid 241200Z - 251200Z
    
    ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM A PORTION
    OF THE CENTRAL PLAINS INTO THE MIDDLE MISSISSIPPI VALLEY REGION...
    
    ...SUMMARY...
    Scattered strong to severe thunderstorms are expected across a broad
    region of the central Plains, Mid Mississippi Valley, and the upper
    Midwest on Thursday. The greatest threat including the potential for
    significant wind damage is forecast over the central Plains into the
    middle Mississippi Valley.
    
    ...Central Plains through middle Mississippi Valley...
    
    MCS currently over eastern NE continue into northern MO through the
    morning before weakening, likely posing an ongoing risk for damaging
    wind. The remnant outflow boundary should extend from central MO
    northwestward through northeast KS into eastern NE, and this feature
    will shift northeast during the day. Robust boundary-layer recovery
    and destabilization will likely occur in the vicinity of and west of
    this boundary as rich low-level moisture (low 70s F dewpoints)
    advects northeast along a southwesterly low-level jet. A cold front
    will likely move slowly southeast and should extend from the upper
    Midwest southwest through central and southwest NE, then northwest
    into the central High Plains. South of this feature, easterly
    low-level winds are expected north of a thermal low that will be
    situated over western KS. A dryline should extend southward from the
    thermal low into the southern High Plains. A corridor of richer
    low-level moisture will likely persist with the easterly low-level
    flow regime across northern KS into central and eastern NE. A warm
    elevated mixed layer with 8.5+ C/km mid-level lapse rates will
    persist across this region above the moist boundary layer
    contributing to MLCAPE from 3000-4000 J/kg. 
    
    Potential areas for thunderstorm initiation include the deeply mixed
    boundary layer across the central High Plains, along the dryline
    from the TX Panhandle into southwest KS and along/north of the
    outflow boundary across northeast KS into northwest MO and southeast
    NE. High-based storms that develop over western KS and southwest NE
    will likely intensify as they spread east and intercept the moist
    and unstable boundary layer across southern NE into northern KS.
    Vertical wind profiles with 40+ kt effective bulk shear will support
    supercells as the initial storm mode, but storms should eventually
    evolve into an organized MCS with potential for significant wind
    damage as it continues through the central Plains into the middle MS
    Valley during the afternoon and into the overnight. The best threat
    for a few tornadoes will be along and just to the cool side of the
    outflow boundary from northeast KS/northwest MO into southeast NE
    and southwestern IA, where 0-1 km hodographs will be the most
    supportive of low-level mesocyclones, especially with any discrete
    supercells that can develop during the afternoon or early evening.
    
    ...Upper Midwest and Great Lakes region...
    
    Thunderstorms are expected to develop along a cold front during the
    afternoon within an environment characterized by modest instability
    and 30-40 kt effective bulk shear. The stronger storms may produce a
    few locally strong to severe wind gusts and hail from afternoon into
    the early evening.
    
    ..Dial/Lyons.. 06/24/2021
    
    
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