WW 85 SEVERE TSTM CO 082020Z – 090300Z
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 85
NWS STORM PREDICTION CENTER NORMAN OK
220 PM MDT MON APR 8 2013
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EASTERN COLORADO
EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 220 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 35
STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH
NORTHEAST OF AKRON COLORADO TO 30 MILES SOUTH OF LAMAR COLORADO.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU5).
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...HIGH-BASED THUNDERSTORM DEVELOPMENT IS EXPECTED IN THE
NEXT COUPLE OF HOURS AS SURFACE HEATING/MIXING CONTINUES ACROSS ERN
CO IN A STEEP LAPSE RATE ENVIRONMENT. VERTICAL SHEAR PROFILES WILL
BE FAVORABLE FOR SUPERCELLS...WITH LARGE HAIL THE PRIMARY THREAT
GIVEN THE LIMITED LOW-LEVEL MOISTURE AS OF EARLY AFTERNOON. AREAS
FARTHER E INTO W/NW KS WILL BE MONITORED FOR MORE OF A MOISTURE
INCREASE THIS AFTERNOON/EVENING...AND SOME THREAT FOR A COUPLE OF
TORNADOES AS THE ERN CO STORMS MATURE AND MOVE INTO KS CLOSER TO 23Z
OR SO.
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 450. MEAN STORM
MOTION VECTOR 23025.
...THOMPSON
via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0085.html
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