SPC Severe Thunderstorm Watch 657
Mon, 13 Sep 2010 19:00:04 -0500
URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 657 NWS STORM PREDICTION CENTER NORMAN OK 610 PM CDT MON SEP 13 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTHERN IOWA NORTHEAST KANSAS NORTHWEST MISSOURI EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 610 PM UNTIL 100 AM CDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHWEST OF LAMONI IOWA TO 40 MILES EAST SOUTHEAST OF SAINT JOSEPH MISSOURI. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7). 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 655...WW 656... DISCUSSION...SUPERCELL CLUSTER NOW MOVING SSE FROM THE OMA AREA EXPECTED TO BE THE DOMINANT MESOSCALE FEATURE FOR THE NEXT FEW HOURS IN THE LWR MO VLY REGION. INSTABILITY/SHEAR PATTERNS SUGGEST THAT COMPLEX SHOULD MOVE MAINLY SEWD. ADDITIONAL STORM DEVELOPMENT MAY OCCUR PREFERENTIALLY ON ERN SIDE OF COMPLEX...AND E OF COMPLEX...IF ASSOCIATED MESOSCALE CIRCULATION ENHANCES WAA/ASCENT ALONG EXISTING W-E BOUNDARY NOW OVER SRN IA. DEGREE OF INSTABILITY AND MODEST BUT SUFFICIENT DEEP SHEAR FOR SUSTAINED STORMS/SUPERCELLS SUGGEST THREAT FOR HIGH WIND/SVR HAIL...AND POSSIBLY A BRIEF TORNADO OR TWO. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR 30030. ...CORFIDIRead more
SPC Tornado Watch 656
Mon, 13 Sep 2010 19:00:07 -0500
URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 656 NWS STORM PREDICTION CENTER NORMAN OK 240 PM CDT MON SEP 13 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTHWEST IOWA NORTHERN KANSAS SOUTHERN AND CENTRAL NEBRASKA EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 240 PM UNTIL 1100 PM CDT. TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES NORTH NORTHWEST OF MCCOOK NEBRASKA TO 15 MILES EAST NORTHEAST OF FALLS CITY NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6). REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND 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. OTHER WATCH INFORMATION...CONTINUE...WW 655... DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN NUMBER AND INTENSITY THIS AFTERNOON AND EVENING FROM THE VICINITY OF A SURFACE LOW NW OF HLC EWD ALONG EITHER SIDE OF A STATIONARY BOUNDARY SITUATED NEAR THE NEB/KS BORDER. THE COMBINATION OF BOUNDARY LAYER DEWPOINTS IN THE MID 60S TO LOWER 70S AND STEEP MIDLEVEL LAPSE RATES IS YIELDING A MODERATE TO STRONGLY UNSTABLE AIR MASS WITH MLCAPE OF 2000-3000+ J/KG AND A WEAKENING CAP. DEEP-LAYER SHEAR IS ALREADY SUPPORTIVE OF SUPERCELLS AND AS A SLY LLJ INCREASES TO 30+ KT TOWARD 14/00Z...LOW-LEVEL SHEAR WILL ACCORDING STRENGTHEN. AS SUCH...THE INITIAL HAZARDS WILL BE LARGE HAIL AND DAMAGING WINDS. HOWEVER...THE POTENTIAL FOR A FEW TORNADOES WILL INCREASE BY LATE AFTERNOON THROUGH THIS EVENING. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 29025. ...MEADRead more
SPC Severe Thunderstorm Watch 657 Status Reports
Mon, 13 Sep 2010 19:00:06 -0500
STATUS FOR WATCH 0657 HAS NOT BEEN ISSUED YETRead more
SPC Tornado Watch 656 Status Reports
Mon, 13 Sep 2010 19:00:09 -0500
STATUS REPORT ON WW 656 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1822 ..SMITH..09/13/10 ATTN...WFO...OAX...TOP...GLD...GID...LBF... STATUS REPORT FOR WT 656 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IAC071-129-137-145-155-140040- IA . IOWA COUNTIES INCLUDED ARE FREMONT MILLS MONTGOMERY PAGE POTTAWATTAMIE KSC013-027-029-039-065-085-089-117-123-131-137-141-143-147-149- 157-161-163-183-201-140040- KS . KANSAS COUNTIES INCLUDED ARE BROWN CLAY CLOUD DECATUR GRAHAM JACKSON JEWELL MARSHALL MITCHELL NEMAHA NORTON OSBORNE OTTAWA PHILLIPS POTTAWATOMIE REPUBLIC RILEY ROOKS SMITH WASHINGTONRead more
SPC Severe Thunderstorm Watch 655 Status Reports
Mon, 13 Sep 2010 19:00:12 -0500
STATUS REPORT ON WW 655 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 10 SSW AVP TO 20 SSW BDL. ..NWSSPC..09/13/10 ATTN...WFO...OKX...BOX...ALY...PHI...BGM... STATUS REPORT FOR WS 655 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS CTC001-007-009-132240- CT . CONNECTICUT COUNTIES INCLUDED ARE FAIRFIELD MIDDLESEX NEW HAVEN NJC003-013-017-019-027-031-035-037-039-041-132240- NJ . NEW JERSEY COUNTIES INCLUDED ARE BERGEN ESSEX HUDSON HUNTERDON MORRIS PASSAIC SOMERSET SUSSEX UNION WARREN NYC071-079-087-119-132240- NY . NEW YORK COUNTIES INCLUDED ARE ORANGE PUTNAM ROCKLANDRead more
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