Severe Thunderstorm Warning 26, NWS Cheyenne, WY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
615 PM MDT THU MAY 22 2008

.DISCUSSION...HAVE JUST UPDATED THE GRIDS AND FORECAST TO REMOVE
THE WIND ADVISORY FOR THE PANHANDLE.

&&

.PREVIOUS DISCUSSION.../ISSUED AT 444 PM MDT THU MAY 22 2008/

SHORT TERM...TONIGHT AND FRIDAY...BUSY SHIFT WITH SEVERE TSTMS AND
HEAVY RAIN. TORNADO WATCH FROM WEST OF KCYS TO KSNY GOES UNTIL 02Z
WITH A SEVERE TSTM WATCH UNTIL 03Z ALONG AND SOUTH OF A LINE FROM
KLAR TO KCDR. FLASH FLOOD WATCH UNTIL 06Z FOR AREA FROM KLAR TO KDGW
TO W OF KCYS. STRONG SSE FLOW ALOFT WILL CONTINUE AS UPPER LOW OVER
NW AZ REFORMS NORTHWESTWARD. SERIES OF SHORTWAVE TROUGHS WILL BE
ROTATING THROUGH THE UPPER FLOW ENHANING THE SHOWERS AND TSTMS.
CURRENTLY...IT APPEARS THAT AFTER LATE THIS EVENING...THERE WILL BE
AT LEAST A DECREASE IN COVERAGE FOR A TIME TONIGHT BEFORE MORE
SHOWERS AND TSTMS DEVELOP LATE FRIDAY MORNING AND AFTERNOON. SOME
STRONG TSTMS POSSIBLE OVER EASTERN CWA FRI AFTERNOON PER SPC DAY 2
OUTLOOK AND MODEL CAPE PROGS. TEMPS WILL STILL BE COOL FRIDAY BUT
NOT AS COOL AS TODAY.

LONG TERM...AN UPPER TROUGH/LOW WILL REMAIN OVER THE INTERMOUNTAIN
WEST THROUGH THE WEEKEND.  THE UPPER LOW WILL BEGIN TO FILL EARLY
NEXT WEEK...WITH THE TROUGH AXIS FINALLY MOVING ACROSS THE CWA ON
TUESDAY.  THIS PATTERN WILL RESULT IN A CHANCE OF SHOWERS AND
AFTERNOON AND EVENING THUNDERSTORMS EACH DAY ACROSS THE AREA...WITH
THE NEXT BEST CHANCE FOR SEVERE WEATHER TUESDAY.  DRY AND WARMER
CONDITIONS WILL RETURN TO THE AREA FOR WED AND THURSDAY.

&&

.AVIATION...MVFR AND EVEN IFR CEILINGS WILL PERSIST IN MUCH OF
THE CWA FOR A TIME THIS EVENING WITH SOME IMPROVEMENT OVERNIGHT
AS THE SHOWERS/TSTMS PULL NORTH AWAY FROM THE SOUTHERN CWA.
WILL NEED TO WATCH FOR AREAS OF FOG DEVELOPING LATER. MVFR
CEILINGS WILL FORM AGAIN LATE FRI MORNING AND AFTERNOON OVER AT
LEAST EASTERN CWA FROM MORE SHOWERS AND TSTMS FORMING. JLH

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...FLASH FLOOD WATCH UNTIL MIDNIGHT FRIDAY FOR WYZ059-WYZ064-WYZ065-
     WYZ066-WYZ067.
     FLOOD WATCH UNTIL 6 PM FRIDAY FOR WYZ061-WYZ063.
NE...NONE.

&&

WEILAND

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
358 PM MDT THU MAY 22 2008

NEZ054-055-WYZ066-069-070-231200-
KIMBALL-CHEYENNE-LARAMIE RANGE-CHEYENNE FOOTHILLS-PINE BLUFFS-
358 PM MDT THU MAY 22 2008

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL CONTINUE THIS EVENING.  SOME OF
THE STORMS MAY BE SEVERE WITH LARGE HAIL...HEAVY RAIN AND
POSSIBLY EVEN TORNADOES. A TORNADO WATCH IS IN EFFECT UNTIL
8 PM MDT THIS EVENING.

THE SHOWERS AND THUNDERSTORMS WILL DECREASE IN COVERAGE AND
INTENSITY FROM LATE EVENING ONWARD. HOWEVER...AREAS OF FOG
CAN BE EXPECTED TO PERSIST.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE WILL BE A CHANCE OF LATE DAY THUNDERSTORMS ESSENTIALLY
EACH DAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED THIS AFTERNOON AND EVENING.

&&

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

WYZ061-063-231200-
SOUTHWEST CARBON-SNOWY RANGE-
358 PM MDT THU MAY 22 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WYOMING.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A FLOOD WARNING REMAINS IN EFFECT ALONG THE LITTLE SNAKE RIVER IN
FAR SOUTHWEST CARBON COUNTY THROUGH 3 PM FRIDAY. A FLOOD WATCH
CONTINUES FOR CENTRAL AND SOUTHERN PARTS OF THE COUNTY THROUGH
FRIDAY. THERE IS A CONCERN THAT ADDITIONAL SHOWERS AND
THUNDERSTORMS THIS AFTERNOON AND TONIGHT COULD CAUSE SOME RIVERS
AND STREAMS ALREADY SWOLLEN WITH SNOW MELT RUNOFF TO FLOOD.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE IS A CHANCE OF LATE DAY THUNDERSTORMS JUST ABOUT EACH DAY.

.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

NEZ001>003-019>021-WYZ060-067-068-231200-
SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-NIOBRARA-PLATTE-
GOSHEN-
358 PM MDT THU MAY 22 2008

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

NUMEROUS SHOWERS AND THUNDERSTORMS CAN BE EXPECTED THE REST OF
THIS AFTERNOON AND EVENING. SOME OF THE THUNDERSTORMS MAY BE
SEVERE WITH LARGE HAIL AND HEAVY RAIN. A SEVERE THUNDERSTORM WATCH
IS IN EFFECT UNTIL 9 PM MDT FOR ALL BUT NIOBRARA COUNTY IN EAST
CENTRAL WYOMING.

ALSO...A FLASH FLOOD WATCH IS IN EFFECT FOR PLATTE COUNTY
UNTIL MIDNIGHT AS ADDITIONAL RAINFALL WILL BRING THE THREAT
OF FLOODING WHERE HEAVY RAINS FELL WEDNESDAY EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE IS A CHANCE OF LATE DAY THUNDERSTORMS EACH DAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING.

&&

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

WYZ062-231200-
NORTH CARBON-
358 PM MDT THU MAY 22 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WYOMING.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL CONTINUE THROUGH THE EVENING.
SOME OF THE STORMS MAY HAVE SMALL HAIL AND HEAVY RAIN. THE
SHOWERS AND THUNDERSTORMS WILL CONTINUE ON A SCATTERED BASIS
OVERNIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE WILL BE A CHANCE OF LATE DAY THUNDERSTORMS EACH DAY.

.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

WYZ059-064-065-231200-
CONVERSE-NORTH LARAMIE RANGE-LARAMIE VALLEY-
358 PM MDT THU MAY 22 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WYOMING.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL CONTINUE THIS EVENING. SOME
THUNDERSTORMS MAY BE SEVERE WITH HAIL AND HEAVY RAIN OVER ALBANY
COUNTY WHERE A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM.
A FLASH FLOOD WATCH IS ALSO IN EFFECT UNTIL MIDNIGHT AS THE
ADDITIONAL RAINFALL WILL AGGRAVATE THE ALREADY SATURATED GROUND
...POSSIBLY CAUSING FLASH FLOODING.

THE SHOWERS AND THUNDERSTORMS WILL SLOWLY DECREASE OVERNIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE WILL BE A CHANCE OF THUNDERSTORMS ESSENTIALLY EACH DAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING.

&&

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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
741 PM MDT THU MAY 22 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0740 PM     HAIL             10 W CHEYENNE           41.15N 104.98W
05/22/2008  M0.25 INCH       LARAMIE            WY   TRAINED SPOTTER

            GROUND IS WHITE.

&&

BCHAPMAN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
826 PM MDT THU MAY 22 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0821 PM     FUNNEL CLOUD     CHEYENNE                41.15N 104.79W
05/22/2008                   LARAMIE            WY   PUBLIC

            MULTY REPORTS OF FUNNELS AND A POSSIBLE TORNADO TOUCH
            DOWN.THESE REPORTS HAVE BEEN COMING IN FROM ALL OVER
            TOWN.UNABLE TO VERIFY VISUALY FROM WEATHER SERVICE
            OFFICE.

&&

BCHAPMAN

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