Severe Thunderstorm Warning 83, NWS Cheyenne, WY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
304 PM MDT SAT JUN 19 2010

.SHORT TERM...TONIGHT THROUGH MONDAY...

CURRENT SITUATION...AREA STILL CAPPED PRETTY GOOD LOOKING AT RUC
CINH FORECASTS FOR THIS AFTERNOON. WITH CONVECTIVE TEMPERATURE
AROUND 80F...AND CURRENT TEMPERATURES IN THE LOW 70S...IT MAY BE
HARD TO BREAK THE LOW LEVEL CAPPING INVERSION TO INITIATE
CONVECTION. WE ARE OBSERVING SOME VERY WEAK CONVECTION ACROSS
NIOBRARA AND PLATTE COUNTIES WHERE TEMPERATURES ARE A BIT CLOSER
TO THE CONVECTIVE TEMPERATURES. WILL NEED TO MONITOR RADAR TRENDS
LATE THIS AFTERNOON. RUC BREAKS THE CAP ACROSS GOSHEN...EASTERN
LARAMIE AND EXTREME WESTERN NEBRASKA FOR A BRIEF PERIOD THIS
AFTERNOON...WITH CAPE VALUES AROUND 4000 J/KG. SO ISOLATED SEVERE
THUNDERSTORMS ARE STILL POSSIBLE.

SIMILAR CONDITIONS EXPECTED FOR SUNDAY...WITH SAME AREA UNDER THE
GUN...EXTREME SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE. WRF
BREAKS LOW LEVEL CAP EARLIER SUNDAY AROUND 18-21Z. GOING TO BE A
LITTLE WARMER TOMORROW AS WELL BY ABOUT 3 DEGREES OR SO. FOR
MONDAY...UPPER LEVEL STORM SYSTEM TRACKS INTO WESTERN MONTANA WITH
CONVECTION MOVING NORTH OF WYOMING.

.LONG TERM...MONDAY NIGHT THROUGH SATURDAY...MEDIUM RANGE MODELS
IN GOOD AGREEMENT...SHOWING A SUMMER WEATHER PATTERN ACROSS
SOUTHEAST WYOMING AND WRN NEBRASKA THROUGH NEXT WEEK. MODELS SHOW
UPPER LEVEL HIGH PRESSURE CENTERED OVER THE SOUTHERN PLAINS AND
SOUTHERN MISSISSIPPI RIVER VALLEY THROUGH NEXT WEEK. THE HIGH IS
EXPECTED TO SLOWLY NUDGE EASTWARD OVER TIME...ALLOWING A LONGWAVE
TROUGH TO SETTLE OVER THE WESTERN UNITED STATES AND WESTERN
CANADA. WITH AN ACTIVE JET OVER THE AREA THROUGH THE WEEK...IN
ADDITION TO LOW TO MIDLEVEL MOISTURE PUSHING INTO THE REGION FROM
THE SOUTH AND SEVERAL WEAK SHORTWAVES EJECTING NORTHEASTWARD OVER
THE NRN AND CNTRL ROCKIES...EXPECT A DAILY CHANCE OF THUNDERSTORMS
OVER THE REGION THROUGH THE MIDDLE OF THE WEEK...ESPECIALLY EAST
OF THE LARAMIE RANGE. THE ONLY EXCEPTION IS FRIDAY...WITH MODELS
SHOWING A WEAK PACIFIC FRONT PUSHING ACROSS THE AREA RESULTING IN
DRIER WESTERLY FLOW. KEPT A SLIGHT CHANCE OF TSTORMS IN THE
FORECAST FOR MAINLY ISOLATED COVERAGE...BUT DID EXTEND THE
COVERAGE FURTHER WEST ALONG THE LARAMIE RANGE. HIGH TEMPS ARE
EXPECTED TO BE SEASONABLY WARM AND AROUND 80 ACROSS CARBON AND
ALBANY COUNTIES OF WYOMING...WITH HIGHS IN THE 80S TO LOW 90S OVER
THE HIGH PLAINS OF WYOMING AND WRN NEBRASKA. &&

.AVIATION...18Z TAF ISSUANCE. VFR CONDITIONS EXPECTED THROUGH THIS
EVENING WITH SOUTH WINDS BETWEEN 15 TO 25 KTS. WINDS WILL BE MORE
OUT OF THE SOUTHWEST ACROSS CARBON COUNTY WITH SOUTH TO SOUTHEAST
WINDS EAST OF RAWLINS. ISOLATED THUNDERSTORMS ARE EXPECTED THROUGH
THIS EVENING EAST OF THE LARAMIE RANGE...WITH THE BEST CHANCE OF
TSTORMS ACROSS WESTERN NEBRASKA.

FOR LATE TONIGHT...THERE IS A 25 PCT CHANCE OF MVFR CONDITIONS AND
MIST ACROSS PORTIONS OF WESTERN NEBRASKA INCLUDING
KSNY...KAIA...AND KBFF.
&&

.FIRE WEATHER...NO FIRE WEATHER CONCERNS AS FIRE DANGER REMAINS IN
THE LOW CATEGORY ACROSS THE AREA. WEST TO SOUTHWEST WINDS WILL BE
FROM 20 TO 30 MPH WITH GUSTS TO 40 MPH ACROSS AREAS WEST OF THE
LARAMIE RANGE. THESE STRONG WINDS EXPECTED TO DIMINISH AFTER
SUNSET THIS EVENING.

&&

.HYDROLOGY...CONCERN CONTINUES FOR OUR EASTERN CWA WHERE RIVER CRESTS
CONTINUE TO MOVE DOWNSTREAM. RELEASES FROM WHEATLAND RESERVOIR
NUMBER 2 AND GRAY ROCKS ARE KEEPING THE LARAMIE RIVER ABOVE FLOOD
STAGE. ADDITIONALLY CRESTS FROM THE UPPER NORTH PLATTE ARE NOW MAKING
THEIR WAY INTO THE NEBRASKA PANHANDLE WITH FLOODING FORECAST AT BOTH
HENRY...MINITARE AND MITCHELL ALONG THE PLATTE RIVER. THESE HIGH
WATERS EXPECTED TO CONTINUE INTO NEXT WEEK AS RELEASES CONTINUE.

&&

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

&&

SHORT TERM/FIRE WEATHER...CLAYCOMB
LONG TERM/AVIATION...TJT

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
1030 AM MDT SAT JUN 19 2010

NEZ002-003-019>021-054-055-095-096-WYZ101>103-106>108-116>119-
201100-
DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-
NORTH SIOUX-SOUTH SIOUX-CONVERSE COUNTY LOWER ELEVATIONS-
NIOBRARA COUNTY-NORTH LARAMIE RANGE-
CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY-
EAST PLATTE COUNTY-GOSHEN COUNTY-SOUTH LARAMIE RANGE-
SOUTH LARAMIE RANGE FOOTHILLS-CENTRAL LARAMIE COUNTY-
EAST LARAMIE COUNTY-
1030 AM MDT SAT JUN 19 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA
PANHANDLE...SOUTHEAST WYOMING.

.DAY ONE...TODAY AND TONIGHT

ISOLATED THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND EVENING. A
FEW STORMS COULD BECOME STRONG OR SEVERE MAINLY OVER THE NEBRASKA
PANHANDLE WITH HAIL THE MAIN THREAT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

WIDELY SCATTERED MAINLY AFTERNOON AND EVENING THUNDERSTORMS ARE
POSSIBLE PRIMARILY ON SUNDAY AND MONDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

&&

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND
CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT...
HTTP://WEATHER.GOV/CHEYENNE

WYZ104-105-109>115-201100-
FERRIS/SEMINOE/SHIRLEY MOUNTAINS-SHIRLEY BASIN-
CENTRAL CARBON COUNTY-NORTH SNOWY RANGE FOOTHILLS-
SOUTHWEST CARBON COUNTY-SIERRA MADRE RANGE-
UPPER NORTH PLATTE RIVER BASIN-SNOWY RANGE-LARAMIE VALLEY-
414 AM MDT SAT JUN 19 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL WYOMING AND
SOUTHEAST WYOMING.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.

&&

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND
CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT...
HTTP://WEATHER.GOV/CHEYENNE

CLAYCOMB

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