Large-area PDS up
Posted by
JAC on 5/25/2011, 12:37 pm


URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 370 NWS STORM PREDICTION CENTER NORMAN OK 1110 AM CDT WED MAY 25 2011 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTHERN ILLINOIS SOUTHERN INDIANA WESTERN AND CENTRAL KENTUCKY EASTERN MISSOURI EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1110 AM UNTIL 900 PM CDT. ...THIS IS A PARTICULARLY DANGEROUS SITUATION... DESTRUCTIVE TORNADOES...LARGE HAIL TO 3 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 75 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST OF FARMINGTON MISSOURI TO 40 MILES SOUTH SOUTHEAST OF LOUISVILLE KENTUCKY. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0). 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 367...WW 368...WW 369... DISCUSSION...AN OUTBREAK OF TORNADOES --SOME POTENTIALLY STRONG TO VIOLENT AND LONG-TRACKED-- IS EXPECTED ACROSS THE WATCH AREA TODAY IN ASSOCIATION WITH MULTIPLE WAVES OF SUPERCELLS. THE COMBINATION OF A VERY MOIST BOUNDARY LAYER AND DAYTIME HEATING WILL CONTRIBUTE TO A BROAD...MODERATELY TO STRONGLY UNSTABLE WARM SECTOR WITH MLCAPE VALUES OF 1500-3500 J/KG. THIS INSTABILITY WILL COINCIDE WITH 50-60 KT OF DEEP SWLY SHEAR AND EFFECTIVE SRH OF 300-500 M2/S2...RESULTING IN A VOLATILE ENVIRONMENT QUITE FAVORABLE FOR LONG-LIVED SUPERCELLS. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM MOTION VECTOR 24035. ...MEAD |
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In this thread:
Mid MS-River Area under High-Risk for Severe Weather Today -
JAC,
5/25/2011, 9:01 am- IN dodged a bullet. Looks like no fatalities. - JAC, 5/26/2011, 6:14 am
- Indy TV streaming damage - IndyDave, 5/25/2011, 9:26 pm
- Strong violent tornadoes expected next 2 to 4 hrs - JAC, 5/25/2011, 4:42 pm
- PDS 2 - JAC, 5/25/2011, 1:50 pm
- St Louis Under-the-Gun - JAC, 5/25/2011, 1:07 pm
- Live Feed - JAC, 5/25/2011, 4:44 pm
- Funnel spotted near mall - JAC, 5/25/2011, 4:38 pm
- Sedalia, MO just took a hit - JAC, 5/25/2011, 2:42 pm
- Tornadic cells building and approaching St Louis - JAC, 5/25/2011, 2:14 pm
- Re: St Louis Under-the-Gun - ArgosyTn, 5/25/2011, 1:26 pm
- Strong Uncapped STP in AR - JAC, 5/25/2011, 12:29 pm
- Re: Strong Uncapped STP in AR - ArgosyTn, 5/25/2011, 1:46 pm
- Long-tack tornadoes expected. Another PDS coming up. - JAC, 5/25/2011, 1:14 pm
- MAJOR TORNADO OUTBREAK IS FORECAST - JAC, 5/25/2011, 12:50 pm
- Large-area PDS up - JAC, 5/25/2011, 12:37 pm
- Here's the current STP - JAC, 5/25/2011, 12:30 pm
- IN later this morning - JAC, 5/25/2011, 9:50 am
- Memphis: NAM at 21Z - JAC, 5/25/2011, 9:29 am
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