WATCHES: Severe Thunderstorm Watch Number 555

WWUS20 KWNS 062007
SEL5
SPC WW 062007
COZ000-NEZ000-WYZ000-070200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 555
NWS STORM PREDICTION CENTER NORMAN OK
205 PM MDT MON JUL 6 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

PARTS OF NORTH CENTRAL AND NORTHEASTER COLORADO
WESTERN PORTIONS OF THE NEBRASKA PANHANDLE
PARTS OF EAST CENTRAL AND SOUTHEAST WYOMING

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 205 PM UNTIL 800
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 80
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES EAST
NORTHEAST OF DOUGLAS WYOMING TO 45 MILES WEST SOUTHWEST OF LIMON
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.

OTHER WATCH INFORMATION...CONTINUE...WW 553...WW 554...

DISCUSSION...CONVECTION CONTINUES TO INCREASE ACROSS THE CENTRAL
ROCKIES AHEAD OF A VIGOROUS MID-LEVEL SHORT-WAVE TROUGH CROSSING THE
NORTHERN INTERMOUNTAIN REGION ATTM. NWWD ADVECTION OF UPPER 50S TO
LOW 60S SURFACE DEWPOINTS INTO THE HIGH PLAINS COMBINED WITH DAYTIME
HEATING HAVE RESULTED IN MODERATE DESTABILIZATION...WHICH WILL
SUPPORT AN INTENSIFICATION OF STORMS MOVING SEWD OFF THE HIGHER
TERRAIN.
STORM INTENSIFICATION WILL ALSO BE AIDED BY INCREASING MID-LEVEL
FLOW WITH TIME...CONTRIBUTING TO SHEAR SUFFICIENT FOR MULTICELL
ORGANIZATION -- AND EVENTUALLY PERHAPS SOME MID-LEVEL UPDRAFT
ROTATION. ALONG WITH THE THREAT FOR LARGE HAIL...LOCALLY
STRONG/GUSTY WINDS WILL BE POSSIBLE.

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 30025.

...GOSS

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