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LOT issues Hazardous Weather Outlook (HWO)
"INFORMS YOU ON WEATHER" THIS BLOG WILL INFORM ON WEATHER MOSTLY FOR NORTHERN ILLINOIS AND SURROUNDING AREAS. ALSO MOST AREAS DURRING SEVERE WEATHER.
URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 552 NWS STORM PREDICTION CENTER NORMAN OK 1215 PM CDT FRI AUG 3 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF CENTRAL ALABAMA CENTRAL MISSISSIPPI EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1215 PM UNTIL 700 PM CDT. HAIL TO 1.5 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 50 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH SOUTHWEST OF GREENWOOD MISSISSIPPI TO 50 MILES NORTHEAST OF SELMA ALABAMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2). 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. DISCUSSION...DIFFERENTIAL HEATING ON THE S EDGE OF A CLOUD BAND ACROSS NRN MS/AL WILL PROMOTE NEW THUNDERSTORM DEVELOPMENT THIS AFTERNOON ACROSS CENTRAL MS/AL. STRONG INSTABILITY IS ALREADY PRESENT ACROSS THIS AREA /MLCAPE AOA 3000 J PER KG/...AND EFFECTIVE BULK SHEAR OF 25-30 KT WILL SUPPORT A RISK FOR ORGANIZED MULTICELL CLUSTERS CAPABLE OF PRODUCING DAMAGING DOWNBURST WINDS AND ISOLATED LARGE HAIL THIS AFTERNOON. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR 36015.
URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 551 NWS STORM PREDICTION CENTER NORMAN OK 205 PM MDT THU AUG 2 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EASTERN MONTANA WESTERN NORTH DAKOTA NORTHWEST SOUTH DAKOTA NORTHEAST WYOMING EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 205 PM UNTIL 900 PM MDT. 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 85 STATUTE MILES EAST AND WEST OF A LINE FROM 80 MILES EAST OF GILLETTE WYOMING TO 50 MILES NORTHEAST OF WOLF POINT MONTANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1). 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 550... DISCUSSION...STORMS ARE INTENSIFYING OVER SERN MT AND NERN WY ALONG A DRY LINE/CONVERGENCE ZONE...WHILE NEW CU/TCU IS EVIDENT IN SATELLITE IMAGERY FARTHER NORTH INTO NERN MT WHERE LOW LEVEL MOISTURE WITH SURFACE DEW POINTS REMAIN IN THE 50S. INITIAL ARC OF WARM ADVECTION CONVECTION FROM NERN MT INTO SWRN ND IS EXPECTED TO PROGRESS EWD WITH ADDITIONAL STRONG/SEVERE STORMS DEVELOPING OVER ERN MT AND NERN WY. STEEP LAPSE RATES ARE CONTRIBUTING TO MLCAPE OF 1000-1500 J/KG...AND 30-40 KT WESTERLY MID LEVEL WINDS ARE RESULTING IN SUFFICIENT DEEP LAYER SHEAR TO SUPPORT ORGANIZED SEVERE STORMS INTO THE EVENING HOURS AS ACTIVITY SPREADS EWD. 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 500. MEAN STORM MOTION VECTOR 27025.
SEVERE WEATHER OUTLOOK FOR TODAY |