Severe Thunderstorm Warning 108, NWS Cheyenne, WY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
326 AM MDT MON AUG 21 2006

.SHORT TERM...THROUGH TUE. AN UPPER RIDGE WILL BUILD OVER THE REGION
TODAY AND WILL REMAIN OVER WY TUE. SURFACE HIGH PRESSURE TO OUR EAST
WILL INDUCE LOW LEVEL SOUTHEASTERLY WINDS TODAY...WHICH WILL KEEP
HIGHER DEWPOINT AIR OVER THE AREA. THE AIRMASS WILL BECOME UNSTABLE
THIS AFTERNOON WHICH WILL INTERACT WITH THE ATMOSPHERIC MOISTURE TO
WARRANT A CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS. MODELS HINT
AT PRECIPITATION CONTINUING PAST MIDNIGHT OVER THE NORTHEASTERN
FRINGE OF THE FORECAST AREA THUS WILL INCLUDE CHANCE OF LATE NIGHT
RAINFALL THERE. TEMPS TUE WILL BE WARMER AND WELL ABOVE NORMAL WITH
AFTERNOON TEMPS REACHING THE LOWER TO MID 90S IN MOST AREAS EAST OF
THE MOUNTAINS. TUE WILL HAVE A CHANCE OF AFTERNOON STORMS WITH MOIST
UPSLOPE FLOW CONTINUING OVER MUCH OF THE FORECAST AREA.

.LONG TERM...THE RIDGE ALOFT OVER THE ROCKIES IS FLATTENED TUESDAY
NIGHT AND WEDNESDAY MORNING AS A SHORTWAVE TROUGH MOVES ACROSS THE
NORTHERN ROCKIES AND HIGH PLAINS.  A FAST WESTERLY FLOW ALOFT IS THE
RESULT OVER THE CWA FOR WEDNESDAY AND THURSDAY.  THE ATMOSPHERE WILL
BE VERY WARM AND DRY THOSE DAYS...WITH THE WARMEST DAY APPEARING TO
BE WEDNESDAY.  WINDS ALOFT AND THE SURFACE PRESSURE GRADIENT
INCREASE OVER THE REGION LATE TUESDAY NIGHT AND WEDNESDAY MORNING
AND CONTINUE THROUGH AT LEAST WEDNESDAY EVENING.  CRITICAL FIRE
WEATHER CONDITIONS CAN BE EXPECTED OVER MANY LOCATIONS IN THE CWA
WEDNESDAY AFTERNOON AND EARLY EVENING AS WINDS WILL GUST TO NEAR 40
MPH.  MODELS CONTINUE TO ADVERTISE THE PASSAGE OF A SHORTWAVE TROUGH
AND COLD FRONT FRIDAY AND EARLY FRIDAY NIGHT. THERE DO EXIST
DIFFERENCES IN THE MODELS WITH THE CANADIAN AND NOGAPS MUCH WEAKER
AND FURTHER NORTH WITH THE FEATURE THAN THE GFS AND ECMWF.  WILL
LEAN TOWARD THE GFS AND ECMWF SOLUTION FOR THIS FORECAST.  THE 00Z
GFS NOW IS WETTER THAN ITS PREVIOUS RUNS FOR FRIDAY AFTERNOON AND
FRIDAY NIGHT WITH QPF OVER THE EAST PART OF THE CWA.  DUE TO THE
STRONG SYNOPTIC LIFT AND A TREND OF MORE MOISTURE WILL INCREASE POPS
SOME DURING THOSE TIMES.  HEIGHTS ALOFT REBUILD OVER THE ROCKIES
SATURDAY WITH THE RIDGE OVER THE AREA THROUGH NEXT MONDAY.  FRIDAY
WILL BE COOLER BEHIND THE FRONT AND SATURDAY SHOULD HAVE
TEMPERATURES JUST A BIT BELOW NORMAL AS THE SURFACE HIGH TRAVERSES
THE CWA.  TEMPERATURES THEN WARM FOR SUNDAY AND MONDAY.  WILL KEEP
SATURDAY THROUGH MONDAY DRY.

&&

.FIRE WEATHER...FIRE WEATHER CONDITIONS WILL BE CRITICAL WEDNESDAY
AND POSSIBLY THURSDAY IN THE LATE MORNING TO EARLY EVENING HOURS.
AT THIS TIME...HIGH TEMPERATURES FOR WEDNESDAY WILL BE FROM 85 TO 95
IN THE LOWER ELEVATIONS...MINIMUM RELATIVE HUMIDITIES WILL BE FROM
10 TO 15 PERCENT AND WEST WINDS WILL BE SUSTAINED AT 20 TO 25 MPH
WITH GUSTS BETWEEN 35 AND 40 MPH.  THE TEMPERATURES WILL BE A BIT
COOLER ON THURSDAY.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...NONE.
NE...NONE.

&&

JR/WEILAND

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