The SPC is forecasting ...severe thunderstorms expected over parts of the central plains into the upper mississippi valley later today and tonight.... Please read the latest public statement about this event.
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SPC AC 072000 DAY 1 CONVECTIVE OUTLOOK NWS STORM PREDICTION CENTER NORMAN OK 0300 PM CDT SAT JUN 07 2008 VALID 072000Z - 081200Z ...THERE IS A MDT RISK OF SVR TSTMS ACROSS EASTERN NEB/MUCH OF IA INTO SOUTHERN WI/NORTHERN IL... ...THERE IS A SLGT RISK OF SVR TSTMS FROM THE CENTRAL PLAINS INTO THE GREAT LAKES REGION... ...IA/SOUTHERN MN/WI/NORTHERN IL/LOWER MI... SEVERE STORMS INCLUDING TORNADIC SUPERCELLS ARE ONGOING AT MID AFTERNOON ACROSS SOUTHERN WI AND PORTIONS OF EASTERN IA/NORTHWEST IL. THIS ACTIVITY WILL CONTINUE TO POSE A CONSIDERABLE SEVERE/TORNADO THREAT ESPECIALLY ACROSS SOUTHERN WI/FAR NORTHWEST IL...WITH UPSCALE EVOLUTION APPEARING LIKELY OVER THE NEXT FEW HOURS WITH WIND DAMAGE POTENTIAL ALSO INCREASING ACROSS SOUTHEAST WI INTO LOWER MI. WITHIN A VERY UNSTABLE/WEAKLY CAPPED AIRMASS...ADDITIONAL STORMS ARE LIKELY TO DEVELOP THROUGH LATE AFTERNOON ACROSS NORTHERN/CENTRAL IA AND PERHAPS FAR EASTERN NEB/FAR SOUTHERN MN. THE 18Z SPECIAL RAOB FROM OMAHA REFLECTS CONSIDERABLE CAP REMOVAL/IMPLIED LIFT BETWEEN 750-900 MB SINCE 12Z THIS MORNING...WITH INSTABILITY WELL IN LINE WITH THE 3000-4000 J/KG MLCAPE REFLECTED FROM EASTERN NEB INTO SOUTHERN WI PER RUC-BASED OBJECTIVE ANALYSIS. IN ADDITION TO LARGE HAIL...DEEP LAYER SHEAR/LOW LEVEL HODOGRAPHS WILL REMAIN FAVORABLE FOR SUPERCELLS AND TORNADOES IN A RATHER MOIST AIRMASS WITH 70-75 F DEWPOINTS. REFERENCE THE LATEST SPC WATCHES/MESOSCALE DISCUSSIONS FOR SHORT TERM DETAILS. ...NEB/IA TONIGHT... LATER TONIGHT...STRONGER FORCING IS EXPECTED TO OVERSPREAD THE CENTRAL PLAINS AS THE NEXT UPSTREAM SHORTWAVE TROUGH APPROACHES. WITH PLENTIFUL INSTABILITY/STEEPENING MID LEVEL LAPSE RATES...AND THE EXPECTED DEVELOPMENT OF A STRONG LEVEL JET /65+ KT/ AND INTENSE MOISTURE TRANSPORT REGIME...THERE APPEARS TO BE A LIKLIHOOD OF SEVERE STORMS TO DEVELOP...WITH A DAMAGING WIND/HAIL THREAT CONTINUING THROUGH THE OVERNIGHT FROM EASTERN NEB INTO IA/FAR SOUTHERN MN. ...NORTHEAST STATES... REFERENCE SPC MESOSCALE DISCUSSION 1262 FOR ADDITIONAL DETAILS REGARDING ISOLATED SEVERE WIND/HAIL POTENTIAL. ...SOUTHEAST NM/FAR WEST TX... AN ISOLATED STRONG/SEVERE STORM OR TWO WILL BE POSSIBLE THROUGH EARLY EVENING WITHIN A MOIST/UNSTABLE AIRMASS ACROSS SOUTHEAST NM/FAR WEST TX. ..GUYER.. 06/07/2008 CLICK TO GET WUUS01 PTSDY1 PRODUCT NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 0100Z