High Wind Warning 7, NWS Cheyenne, WY

514 
WWUS75 KCYS 242101
NPWCYS

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHEYENNE WY
301 PM MDT MON MAY 24 2010

...VERY STRONG WINDS WILL CONTINUE TO IMPACT SOUTHEAST WYOMING
AND THE WESTERN NEBRASKA PANHANDLE THROUGH THIS EVENING...

.A PACIFIC STORM SYSTEM WILL MOVE NORTHEAST ACROSS THE CENTRAL
ROCKIES AND INTO THE WESTERN DAKOTAS THROUGH TONIGHT. AN
ASSOCIATED STRONG COLD FRONT HAS MOVED ACROSS SOUTHEAST WYOMING 
AND NEARBY AREAS OF THE NEBRASKA PANHANDLE AND WILL CONTINUE TO
MOVE EAST THROUGH THE REST OF THE PANHANDLE BY THE EARLY EVENING.
THE VERY STRONG WESTERLY WINDS WILL BE BEHIND THE COLD FRONT.
THE WINDS WILL GRADUALLY DIMINISH OVER THE REGION LATE MONDAY
EVENING.

WYZ103-105-106-110>112-114>119-250200-
/O.CON.KCYS.HW.W.0007.000000T0000Z-100525T0200Z/
NORTH LARAMIE RANGE-SHIRLEY BASIN-
CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY-
NORTH SNOWY RANGE FOOTHILLS-SOUTHWEST CARBON COUNTY-
SIERRA MADRE RANGE-SNOWY RANGE-LARAMIE VALLEY-SOUTH LARAMIE RANGE-
SOUTH LARAMIE RANGE FOOTHILLS-CENTRAL LARAMIE COUNTY-
EAST LARAMIE COUNTY-
INCLUDING THE CITIES OF...MEDICINE BOW...BORDEAUX...ARLINGTON...
ELK MOUNTAIN...BAGGS...DIXON...CENTENNIAL...ALBANY...
WOODS LANDING...LARAMIE...VEDAUWOO...BUFORD...PUMPKIN VINE...
HORSE CREEK...HARRIMAN...WHITAKER...CHEYENNE...BURNS...
CARPENTER...ALBIN...PINE BLUFFS
301 PM MDT MON MAY 24 2010

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS
EVENING...

A HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS
EVENING. 

* TIMING...STRONG WEST WINDS WILL CONTINUE OVER SOUTHEAST WYOMING
  THROUGH THE EVENING. THE STRONGEST WINDS WILL BE THROUGH 6 PM.

* WINDS...WEST WINDS WILL BE SUSTAINED AT 35 TO 45 MPH WITH GUSTS
  AS HIGH AS 70 MPH THROUGH THE EARLY EVENING. THE STRONGER WINDS
  WILL BE ALONG AND EAST OF THE LARAMIE RANGE.

* REPORTS...WINDS GUSTED TO 64 MPH IN CHEYENNE AND 66 MPH IN
  TORRINGTON AT 230 PM. WINDS AS HIGH AS 73 MPH WERE REPORTED
  ALONG THE LARAMIE RANGE AND JUST NORTHEAST OF CHEYENNE.

* IMPACTS...TRAVEL IN LIGHTWEIGHT OR HIGH PROFILE VEHICLES WILL BE
  HAZARDOUS THROUGH THE EVENING DUE TO THE STRONG WINDS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED
OR OCCURRING. SUSTAINED WIND SPEEDS OF AT LEAST 40 MPH OR GUSTS
OF 58 MPH OR MORE CAN LEAD TO PROPERTY DAMAGE. FOR DETAILED ROAD
AND TRAVEL CONDITIONS IN WYOMING AND NEBRASKA...DIAL 5 1 1.

&&

$$

NEZ002-003-019>021-054-055-095-096-WYZ101-102-107-108-250200-
/O.CON.KCYS.HW.W.0007.000000T0000Z-100525T0200Z/
DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-
NORTH SIOUX-SOUTH SIOUX-CONVERSE COUNTY LOWER ELEVATIONS-
NIOBRARA COUNTY-EAST PLATTE COUNTY-GOSHEN COUNTY-
INCLUDING THE CITIES OF...CHADRON...ALLIANCE...SCOTTSBLUFF...
GERING...HARRISBURG...BRIDGEPORT...BAYARD...KIMBALL...SIDNEY...
HARRISON...AGATE...DOUGLAS...GLENROCK...LUSK...GLENDO...
WHEATLAND...CHUGWATER...GUERNSEY...TORRINGTON
301 PM MDT MON MAY 24 2010

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS
EVENING...

A HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS
EVENING. 

* TIMING...STRONG SOUTH WINDS WILL CONTINUE TO GRADUALLY SHIFT
  FROM WEST TO EAST OVER THE PANHANDLE THROUGH THE LATE AFTERNOON.
 
* WINDS...SOUTH WINDS WILL BE SUSTAINED AT 20 TO 30 MPH IN THE FAR
  EAST PART OF THE PANHANDLE UNTIL 5 PM WITH GUSTS TO 40 MPH.
  OTHERWISE...WEST WINDS WILL SPREAD OVER THE PANHANDLE WITH GUSTS
  AS HIGH AS 60 MPH.

* REPORTS...AT 220 PM THE SCOTTSBLUFF AIRPORT REPORTED A WIND GUST
  OF 72 MPH WITH A GUST TO 58 MPH AT KIMBALL AT 210 PM.

* IMPACTS...TRAVEL IN LIGHTWEIGHT OR HIGH PROFILE VEHICLES MAY 
  BECOME HAZARDOUS MONDAY DUE TO THE STRONG WINDS. VISIBILITIES 
  MAY BECOME REDUCED DUE TO BLOWING DUST FROM RECENTLY PLOWED 
  FIELDS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED
OR OCCURRING. SUSTAINED WIND SPEEDS OF AT LEAST 40 MPH OR GUSTS
OF 58 MPH OR MORE CAN LEAD TO PROPERTY DAMAGE. FOR DETAILED ROAD
AND TRAVEL CONDITIONS IN WYOMING AND NEBRASKA...DIAL 5 1 1.

&&

$$

WYZ104-109-113-250000-
/O.CON.KCYS.HW.A.0005.000000T0000Z-100525T0000Z/
FERRIS/SEMINOE/SHIRLEY MOUNTAINS-CENTRAL CARBON COUNTY-
UPPER NORTH PLATTE RIVER BASIN-
INCLUDING THE CITIES OF...MUDDY GAP...RAWLINS...SINCLAIR...
HANNA...SARATOGA...ENCAMPMENT...RIVERSIDE
301 PM MDT MON MAY 24 2010

...HIGH WIND WATCH REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

A HIGH WIND WATCH REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING. 

* TIMING...THE STRONG WINDS WILL CONTINUE THROUGH 6 PM AT TIMES
  OVER SOUTH CENTRAL WYOMING.

* WINDS...WEST OR SOUTHWEST WINDS WILL BE SUSTAINED AT 30 TO 40 MPH
  WITH GUSTS TO 60 MPH POSSIBLE.

* IMPACTS...TRAVEL IN LIGHTWEIGHT OR HIGH PROFILE VEHICLES MAY 
  BECOME HAZARDOUS MONDAY DUE TO THE STRONG WINDS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WATCH MEANS THERE IS THE POTENTIAL FOR A HAZARDOUS
HIGH WIND EVENT. SUSTAINED WINDS OF AT LEAST 40 MPH...OR GUSTS OF
58 MPH OR STRONGER MAY OCCUR. CONTINUE TO MONITOR THE LATEST
FORECASTS.

&&

$$

WEILAND

170 
WWUS75 KCYS 250155
NPWCYS

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHEYENNE WY
755 PM MDT MON MAY 24 2010

...GUSTY WESTERLY WINDS WILL CONTINUE TO DIMINISH THE REST OF
TONIGHT...

.THE SURFACE COLD FRONT THAT HELPED TO PRODUCE THE STRONG WINDS
THIS AFTERNOON OVER SOUTHEAST WYOMING AND THE WESTERN NEBRASKA
PANHANDLE HAS MOVED EAST AND OVER THE PLAINS. THE WINDS HAVE
GRADUALLY DIMINISHED OVER THE AREA SINCE 6 PM AND THAT TREND 
WILL CONTINUE THE REST OF TONIGHT. WIND GUSTS WILL BE AS HIGH AS
50 MPH THROUGH 05Z...BUT WILL REMAIN BELOW HIGH WIND CRITERIA 
LEVELS. FOR THAT REASON THE HIGH WIND WARNING HAS BEEN CAN CELLED. 

NEZ002-003-019>021-054-055-095-096-WYZ101>103-105>108-110>112-
114>119-250300-
/O.CAN.KCYS.HW.W.0007.000000T0000Z-100525T0200Z/
DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-
NORTH SIOUX-SOUTH SIOUX-CONVERSE COUNTY LOWER ELEVATIONS-
NIOBRARA COUNTY-NORTH LARAMIE RANGE-SHIRLEY BASIN-
CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY-
EAST PLATTE COUNTY-GOSHEN COUNTY-NORTH SNOWY RANGE FOOTHILLS-
SOUTHWEST CARBON COUNTY-SIERRA MADRE RANGE-SNOWY RANGE-
LARAMIE VALLEY-SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS-
CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY-
INCLUDING THE CITIES OF...CHADRON...ALLIANCE...SCOTTSBLUFF...
GERING...HARRISBURG...BRIDGEPORT...BAYARD...KIMBALL...SIDNEY...
HARRISON...AGATE...DOUGLAS...GLENROCK...LUSK...MEDICINE BOW...
BORDEAUX...GLENDO...WHEATLAND...CHUGWATER...GUERNSEY...
TORRINGTON...ARLINGTON...ELK MOUNTAIN...BAGGS...DIXON...
CENTENNIAL...ALBANY...WOODS LANDING...LARAMIE...VEDAUWOO...
BUFORD...PUMPKIN VINE...HORSE CREEK...HARRIMAN...WHITAKER...
CHEYENNE...BURNS...CARPENTER...ALBIN...PINE BLUFFS
755 PM MDT MON MAY 24 2010

...HIGH WIND WARNING IS CAN CELLED...

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS CAN CELLED THE HIGH
WIND WARNING. 

WESTERLY SURFACE WINDS AS OF 730 PM WERE SUSTAINED AT 25 TO 35
MPH WITH GUSTS UP TO 50 MPH OVER MUCH OF SOUTHEAST WYOMING AND THE
WESTERN NEBRASKA PANHANDLE. THOSE SPEEDS WERE LESS THAN THOSE OF
THE AFTERNOON AND THE GRADUAL DECREASE IN WINDS WILL CONTINUE FOR
THE REST OF TONIGHT. FOR THAT REASON...THE HIGH WIND WARNING HAS
BEEN CAN CELLED.  

WINDS GUSTED BETWEEN 60 AND 75 MPH THIS AFTERNOON OVER MANY
LOCATIONS ESPECIALLY ALONG AND EAST OF THE LARAMIE RANGE.  

MOTORISTS SHOULD STILL BE AWARE OF STRONG WINDS GUSTING AS HIGH
AS 50 MPH THROUGH MIDNIGHT ALONG AND EAST OF THE LARAMIE RANGE.  

$$

WEILAND

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
921 PM MDT SUN MAY 23 2010

.DISCUSSION...AFTER A QUICK LOOK AT THE 00Z NAM WILL CONTINUE THE
HIGH WIND WATCH FOR MUCH OF MONDAY OVER THE CWA.  THE NAM IS SIMILAR
IN ITS PAST FEW RUNS AND WOULD SUPPORT A PERIOD OF HIGH WINDS.
INITIALLY...THE SOUTHERLY SURFACE PRESSURE GRADIENT AND WINDS UP TO
700 MB WILL INCREASE TONIGHT AND CONTINUE UNTIL FRONTAL PASSAGE FROM
WEST TO EAST OVER THE CWA ON MONDAY.  ALREADY EARLY THIS EVENING...
THE WINDS ON THE LOWEST GATES OF THE PLATTEVILLE AND GRANADA
PROFILERS WERE RUNNING 30 TO 35 KNOTS.  AM CONCERNED THAT THE
PANHANDLE WILL NEED A WIND ADVISORY PRIOR TO THE HIGH WIND WATCH
START TIME.  WILL MONITOR TRENDS IN THE WINDS IN THAT PART OF THE
CWA OVERNIGHT.  THE HIGH WIND EVENT WILL BECOME A BORA EVENT FROM
WEST TO EAST ACROSS THE CWA ON MONDAY WITH THE COLD FRONTAL
PASSAGE.  THE 700 MB WINDS INCREASE TO 50 KNOTS IN THE AFTERNOON.
THE EXPECTED 3 HOURLY SURFACE PRESSURE RISES WILL BE BETWEEN 3 AND
4 MB WITH COLD AIR ADVECTION AND WOULD SUPPORT AT LEAST A PERIOD OF
HIGH WINDS.  OTHERWISE...A THUNDERSTORM HAS DEVELOPED SINCE 0230Z
JUST TO THE SOUTHEAST OF CHEYENNE COUNTY.  THE SEVERE POTENTIAL
STILL LOOKS TO BE JUST TO THE EAST OF THE CWA...BUT MANY SEVERE
WEATHER PARAMETERS WOULD SUPPORT SEVERE WEATHER IN THE PANHANDLE
OVERNIGHT.  WILL CONTINUE THE MENTION OF SMALL HAIL AND STRONG WIND
GUSTS.

DISCUSSION ISSUED AT 725 PM...
AS DISCUSSED IN THE PREVIOUS DISCUSSION...THE FORECAST
THROUGH MONDAY WILL BE DIFFICULT.  AN ENERGETIC SHORTWAVE TROUGH
MOVING INTO SOUTHWEST UTAH EARLY THIS EVENING WILL APPROACH AND PASS
OVER THE CWA DURING THAT TIME.  ITS MOVEMENT WILL CONTINUE TO MOVE A
WARM FRONT NORTH AND OVER MUCH OF THE CWA TONIGHT.  THAT FEATURE WAS
LOCATED ACROSS CENTRAL COLORADO AT 00Z.  LOW LEVEL MOISTURE WILL
CONTINUE TO INCREASE OVER THE EAST PART OF THE CWA TONIGHT...WITH
THE DEW POINT AT KSNY UP TO 53.  MODELS ALL RAPIDLY INCREASE THE LOW
LEVEL THETA E VALUES EARLY TONIGHT...WITH THE FOCUS JUST EAST OF THE
CWA.  MODELS ALSO STEEPEN THE PASE RATES AND CAPES VALUES OVER THE
PANHANDLE AND LOCATIONS FURTHER EAST.  THE LOW LEVEL JET WILL BE OVER
THE PANHANDLE AS WELL WITH ELEVATED CONVECTION LIKELY.  AT THIS
TIME...WILL KEEP THE MENTION OF SEVERE ACTIVITY TONIGHT OUT OF THE
CWA BUT MENTION GUSTY WINDS AND SMALL HAIL IN THE PANHANDLE.  THE
SOUTHEASTERLY WINDS WILL GUST TO AS HIGH AS 40 MPH FOR MUCH OF TONIGHT
TO THE EAST OF THE LARAMIE RANGE AS WELL AS THE LARAMIE VALLEY THROUGH
THE EVENING.  FOR NOW WILL LEAVE THE HIGH WIND WATCH FOR THE ENTIRE
CWA FOR MUCH OF MONDAY AND WILL TAKE A CLOSER LOOK AT THE NEW MODEL
RUNS BEFORE DOING ANY ADJUSTING.

&&

.PREVIOUS DISCUSSION.../ISSUED AT 305 PM MDT SUN MAY 23 2010/...

SHORT TERM...TONIGHT THROUGH TUESDAY...
A FEW SHOWERS HAVE STARTED TO FORM OFF OF THE SNOWY AND SIERRA MADRE
RANGES AS EXPECTED THIS AFTERNOON. THIS ACTIVITY WILL CONTINUE TO
DEVELOP AS INSTABILITY INCREASES AND UPPER LEVEL ENERGY MOVES CLOSER
AND LINES UP WITH THE RIGHT ENTRANCE REGION OF THE DEPARTING JET
STREAK. 12Z RAOB DATA INDICATED THE BASE OF THE UPPER TROUGH WOULD
CONTINUE TO DIG SOUTH BEFORE EJECTING NORTHEAST TOWARD THE FORECAST
AREA TONIGHT...AND THIS APPEARS TO BE VERIFYING. MODELS ARE IN
AGREEMENT THAT THE LESS ENERGY ON THE BACK SIDE OF THIS TROUGH WILL
MEAN THAT THE LEADING ENERGY WILL EJECT THE LOW NORTHEASTWARD
QUICKLY TO NORTHEAST WYOMING BY 00Z TUESDAY. CYCLOGENESIS BENEATH
THE FAVORABLE UPPER LEVEL PATTERN THIS AFTERNOON WILL CONTINUE TO
DEEPEN THE SURFACE LOW OVER EASTERN UTAH AND WESTERN COLORADO. THE
RESULTING SOUTHEAST FLOW TO THE EAST OF THE LOW WILL ACT TO RETURN A
WARM FRONT NORTHWARD INTO THE AREA THIS EVENING...SETTING THE STAGE
FOR THUNDERSTORM FORMATION WELL INTO THE NIGHTTIME HOURS. THE STORM
PREDICTION CENTER HAS IDENTIFIED MOST OF THE AREA EAST OF THE
LARAMIE RANGE AS HAVING A SLIGHT RISK FOR SEVERE THUNDERSTORMS
TONIGHT. THE LIMITING FACTOR ON CONVECTION UNTIL LATER IN THE
EVENING IS THE HEIGHT RISES AT BOTH 700 MB AND 500 MB OBSERVED IN
THE 12Z RAOBS. AS THE UPPER LOW BEGINS TO EJECT NORTHEAST
TONIGHT...RATHER SIGNIFICANT HEIGHT FALLS WILL EVOLVE IMPROVING THE
ENVIRONMENT FOR CONVECTIVE DEVELOPMENT. THESE HEIGHT FALLS WILL ALSO
INCREASE THE SPEED OF THE SOUTHERLY RETURN FLOW...PARTICULARLY
ACROSS THE NEBRASKA ZONES WITH WIND SPEEDS EXPECTED TO APPROACH
ADVISORY CRITERIA THERE OVERNIGHT. THE MODEL GUIDANCE INDICATES WIND
SPEEDS SHOULD CONTINUE TO INCREASE DURING THE DAY AHEAD OF THE
FRONTAL PASSAGE...SO HAVE ISSUED A HIGH WIND WATCH IN THE PANHANDLE
ZONES DURING THE AFTERNOON FOR BOTH THE STRONG SOUTH WINDS AHEAD OF
THE FRONT AND A PERIOD OF STRONG SUBSIDENCE AND WEST-SOUTHWEST WINDS
WITH THE FRONTAL PASSAGE. WHILE PRE-FRONTAL WINDS ARE NOT EXPECTED
TO BE AS STRONG ACROSS THE SOUTHEAST WYOMING PORTION OF THE
AREA...STRONG WEST WINDS ARE EXPECTED WITH THE FRONTAL PASSAGE
DURING THE AFTERNOON AND HAVE ALSO ISSUED A HIGH WIND WATCH FOR
THESE AREAS. TEMPERATURES WILL BE FALLING THROUGH THE DAY FOLLOWING
HIGHS OBSERVED JUST BEFORE THE FRONTAL PASSAGE...AND FOR THAT REASON
HIGHS WILL BE 20 TO 25 DEGREES WARMER IN THE EASTERN ZONES COMPARED
TO THE WESTERN ZONES. OVERNIGHT LOWS MONDAY NIGHT WILL BE AROUND
FREEZING TO SLIGHTLY BELOW FREEZING ALONG AND WEST OF THE LARAMIE
RANGE...BUT THESE AREAS HAVE AN AVERAGE LAST FREEZE INTO FIRST OR
SECOND WEEK OF JUNE SO THIS IS NOT ALL THAT UNUSUAL FOR THE WESTERN
ZONES. TEMPERATURES THIS COOL WILL CERTAINLY BRING SNOW LEVELS INTO
MANY OF THE LOWER ELEVATIONS OF CARBON COUNTY...WITH SNOW LEVELS
EXPECTED TO DROP TO AROUND 6500 FEET BY MID-AFTERNOON TOMORROW. AT
THIS TIME IT APPEARS THAT A MID-LEVEL DRY SLOT WILL MOVE
PRECIPITATION OUT OF THE CHEYENNE AREA BEFORE TEMPERATURES ARE COOL
ENOUGH TO ALLOW FOR SNOWFALL...BUT WILL NEED TO WATCH THIS ON THE
OVERNIGHT SHIFT. FINALLY...THE UPPER LOW WILL MOVE NORTH OF THE AREA
MONDAY NIGHT AND A SHORT-WAVE UPPER RIDGE WILL BUILD OVER THE
FORECAST AREA...CAUSING TEMPERATURES TO WARM TO ONLY SLIGHTLY BELOW
NORMAL FOR TUESDAY.

LONG TERM...TUESDAY NIGHT THROUGH SUNDAY...

NAM...GFS AND ECMWF IN GOOD AGREEMENT AT 500 MB...THUS MODERATE
TO HIGH CONFIDENCE IN THEIR SOLUTIONS.

TUESDAY NIGHT...SHORTWAVE TROUGH MOVING ACROSS EASTERN COLORADO WILL
PRODUCE ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ACROSS OUR
EASTERN COUNTIES.

WEDNESDAY...LOW LEVEL WINDS TURN SOUTHEAST AND INCREASE IN RESPONSE
TO STRENGTHENING SOUTHWEST FLOW ALOFT. SLIGHT CHANCE OF AFTERNOON
AND EVENING THUNDERSTORMS ALONG AND EAST OF THE LARAMIE RANGE IN
MECHANICAL SOUTHEAST UPSLOPE FLOW.

THURSDAY...HEIGHTS ALOFT RISE TO 5850 METERS AT 500 MB AS THE
CENTRAL UNITED STATES RIDGE AXIS EXERTS ITSELF ACROSS OUR COUNTIES.
WARM TEMPERATURES ALOFT WITH 1000-500 MB THICKNESSES ABOVE 5760
METERS WILL LIKELY INHIBIT ALL BUT ISOLATED AFTERNOON AND EVENING
THUNDERSTORMS OVER THE NORTHERN LARAMIE RANGE.

FRIDAY...WILL CONTINUE WITH A DRY FORECAST...EXCEPT FOR ISOLATED
AFTERNOON AND EVENING THUNDERSTORMS ACROSS THE NORTHERN LARAMIE
RANGE...DUE TO INHIBITING FACTOR OF WARM TEMPERATURES ALOFT GIVEN
THE 1000-500 MB THICKNESSES NEAR 5790 METERS.

SATURDAY...SHORTWAVE TROUGH MOVES ACROSS WYOMING AND MONTANA SENDING
A COLD FRONT ACROSS OUR COUNTIES. TIMING OF THE FRONT STILL IN
QUESTION ON DAY SIX...THUS WILL CONTINUE WITH A MOSTLY DRY FORECAST
FOR NOW DUE TO FRONTAL TIMING UNCERTAINTY.

SUNDAY...SOUTHWEST FLOW ALOFT PREVAILS. LIMITED LOW AND MID LEVEL
MOISTURE AND LACK OF OBVIOUS MESOSCALE AND SYNOPTIC LIFT PRECLUDES
MENTION OF AFTERNOON THUNDERSTORMS.

&&

.AVIATION...
ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS TONIGHT
PRODUCING TURBULENCE AND MVFR. AREAS OF FOG TONIGHT EAST OF THE
LARAMIE RANGE PRODUCING IFR AND MVFR. STRONG COLD FRONTAL PASSAGE
FROM WEST TO EAST ON MONDAY WITH WINDS BECOMING WEST AND INCREASING
SIGNIFICANTLY. SCATTERED SHOWERS AND THUNDERSTORMS PRODUCING MVFR.
VFR MONDAY NIGHT WITH WINDS SUBSIDING.

&&

.FIRE WEATHER...
SCATTERED STRONG STORMS ARE EXPECTED ACROSS THE WESTERN PORTION OF
THE DISTRICT TONIGHT...WITH SCATTERED STORMS WITH THE POTENTIAL TO
BECOME SEVERE ALSO EXPECTED ACROSS THE EASTERN PORTION OF THE
DISTRICT TONIGHT. AN UPPER LEVEL LOW WILL MOVE NORTHEAST ACROSS THE
AREA THROUGH MONDAY AND THIS WILL BRING A SIGNIFICANT COLD FRONT
EAST ACROSS THE AREA. NEBRASKA PANHANDLE PORTIONS OF THE DISTRICT
WILL HAVE VERY STRONG SOUTH WINDS AHEAD OF THE FRONT AND THE ENTIRE
AREA CAN EXPECT A PERIOD OF VERY STRONG WEST-SOUTHWEST WINDS WITH
THE FRONTAL PASSAGE MONDAY AFTERNOON.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...HIGH WIND WATCH FROM 10 AM MONDAY TO 6 PM MONDAY FOR WYZ101-
     WYZ102-WYZ103-WYZ104-WYZ105-WYZ106-WYZ107-WYZ108-WYZ109-
     WYZ110-WYZ111-WYZ112-WYZ113-WYZ114-WYZ115-WYZ116-WYZ117-
     WYZ118-WYZ119.
NE...HIGH WIND WATCH FROM 10 AM MONDAY TO 6 PM MONDAY FOR NEZ002-
     NEZ003-NEZ019-NEZ020-NEZ021-NEZ054-NEZ055-NEZ095-NEZ096.

&&

SHORT TERM/FIRE WEATHER...CARPENTER
LONG TERM/AVIATION...RUBIN
UPDATE...WEILAND

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
100 AM MDT MON MAY 24 2010

NEZ002-003-019>021-054-055-095-096-WYZ101>103-106>108-116>119-
242215-
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-
100 AM MDT MON MAY 24 2010

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

.DAY ONE...TONIGHT

SOME THUNDERSTORMS WILL CONTINUE OVER THE NORTHERN PANHANDLE THROUGH
3 AM. THOSE STORMS WILL PRODUCE MODERATE RAINFALL...SMALL HAIL AND
WIND GUSTS TO 45 MPH. A SMALL STREAM FLOOD ADVISORY REMAINS IN
EFFECT UNTIL 4 AM FOR NORTHWEST SCOTTS BLUFF COUNTY TO SOUTHWEST
DAWES COUNTY...WHERE EARLIER HEAVY RAINS OCCURRED.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

A POTENT UPPER LEVEL DISTURBANCE WILL EJECT NORTHEAST ACROSS
COLORADO AND WYOMING MONDAY AND MONDAY NIGHT. A STRONG PACIFIC
COLD FRONT WILL ALSO SURGE EAST ACROSS THE AREA DURING THE
AFTERNOON AND EVENING. SCATTERED SHOWERS AND THUNDERSTORMS
WILL DEVELOP IN ADVANCE OF THE FRONT. SOME OF THE STORMS MAY
BE STRONG WITH HAIL AND LOCALLY HEAVY RAINFALL EAST OF THE
LARAMIE RANGE. A TIGHT PRESSURE GRADIENT WILL GENERATE VERY
WINDY CONDITIONS ACROSS THE AREA MONDAY AFTERNOON AND EVENING.
IT WILL TURN COLDER MONDAY NIGHT WITH TEMPERATURES FALLING
TO THE FREEZING MARK AND BELOW OVER THE HIGHER TERRAIN AND
SURROUNDING VALLEYS OF THE LARAMIE...SNOWY AND SIERRA MADRE
RANGES. THERE WILL BE A PERIOD OF SNOW SHOWERS...HOWEVER
SNOW ACCUMULATIONS WILL BE LIGHT. WINDS WILL DIMINISH TUESDAY
AS WEAK HIGH PRESSURE DOMINATES. ANOTHER UPPER LEVEL DISTURBANCE
AND RETURN MOISTURE FROM THE SOUTHEAST WILL BRING A CHANCE OF
SHOWERS AND THUNDERSTORMS TUESDAY NIGHT AND WEDNESDAY. THEN HIGH
PRESSURE ALOFT BUILDS OVER THE PLAINS FOR THE END OF THE
WEEK...RESULTING IN LITTLE OR NO PRECIPITATION AND WARMER THAN
NORMAL TEMPERATURES. THESE WARMER TEMPERATURES WILL CAUSE AN
INCREASE IN SNOW MELT WHICH MAY LEAD TO HIGHER RIVER AND STREAM
LEVELS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT.

&&

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

WYZ104-105-109>115-242215-
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-
100 AM MDT MON MAY 24 2010

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

.DAY ONE...TONIGHT

SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WILL CONTINUE TONIGHT
FOR AREAS OVER AND WEST OF THE LARAMIE RANGE.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

A POTENT UPPER LEVEL DISTURBANCE WILL EJECT NORTHEAST ACROSS
COLORADO AND WYOMING MONDAY AND MONDAY NIGHT. A STRONG PACIFIC
COLD FRONT WILL ALSO SURGE EAST ACROSS THE AREA LATE MONDAY
AFTERNOON AND EVENING. SCATTERED SHOWERS AND THUNDERSTORMS WILL
DEVELOP IN ADVANCE OF THE FRONT. SOME OF THE STORMS MAY BE STRONG
TO SEVERE WITH LARGE HAIL AND DAMAGING WINDS. A TIGHT PRESSURE
GRADIENT WILL GENERATE VERY WINDY CONDITIONS ACROSS THE AREA
MONDAY AFTERNOON AND EVENING. IT WILL TURN COLDER MONDAY NIGHT
WITH TEMPERATURES FALLING INTO THE MID AND UPPER 30S BY TUESDAY
MORNING. WINDS WILL DIMINISH TUESDAY AS WEAK HIGH PRESSURE
DOMINATES. ANOTHER UPPER LEVEL DISTURBANCE AND RETURN MOISTURE
FROM THE SOUTHEAST WILL BRING A CHANCE OF SHOWERS AND THUNDERSTORMS
TUESDAY NIGHT AND WEDNESDAY. THEN HIGH PRESSURE ALOFT BUILDS OVER
THE PLAINS FOR THE END OF THE WEEK...RESULTING IN LITTLE OR NO
PRECIPITATION AND WARMER THAN NORMAL TEMPERATURES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED TONIGHT.

&&

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

WEILAND

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1106 PM MDT SUN MAY 23 2010

WYZ118-119-240600-
CENTRAL LARAMIE COUNTY WY-EAST LARAMIE COUNTY WY-
1106 PM MDT SUN MAY 23 2010

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN LARAMIE COUNTY UNTIL
MIDNIGHT MDT...

AT 1100 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES SOUTH OF LA
GRANGE TO 7 MILES EAST OF BURNS...AND MOVING NORTH AT 45 MPH.

HAIL UP TO THE SIZE OF PENNIES IS POSSIBLE WITH THESE STORMS.

LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...
  PINE BLUFFS...

THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 384 AND
402.

RE

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1137 PM MDT SUN MAY 23 2010

NEZ002-019-095-096-WYZ108-240615-
DAWES NE-GOSHEN COUNTY WY-NORTH SIOUX NE-SCOTTS BLUFF NE-SOUTH SIOUX
NE-
1137 PM MDT SUN MAY 23 2010

...SIGNIFICANT WEATHER ADVISORY FOR EXTREME EASTERN GOSHEN...SIOUX...
NORTHWESTERN DAWES AND WESTERN SCOTTS BLUFF COUNTIES UNTIL 1215 AM
MDT...

AT 1132 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES NORTHWEST OF
WHITNEY LAKE TO 7 MILES EAST OF HAWK SPRINGS RECREATION AREA...AND
MOVING NORTH AT 50 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THESE STORMS.

LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...
  GLEN...
  LYMAN...
  AGATE...
  MOUNT EDNA...
  NORMAN RESERVOIR...
  AGATE DAM RESERVOIR...
  MONTROSE...
  HARRISON...
  HENRY...

THESE STORMS MAY INTENSIFY...AND A SEVERE THUNDERSTORM WATCH IS IN
EFFECT FOR THIS AREA UNTIL 5 AM MDT. BE CERTAIN TO MONITOR LOCAL
RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR
ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.

RE

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1141 PM MDT SUN MAY 23 2010

WYZ101-240630-
CONVERSE COUNTY LOWER ELEVATIONS WY-
1141 PM MDT SUN MAY 23 2010

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CONVERSE COUNTY
UNTIL 1230 AM MDT...

AT 1136 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 10 MILES WEST OF MANNING RANCH...OR 20 MILES
NORTHEAST OF DOUGLAS...MOVING NORTH AT 40 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THIS STORM.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  DULL CENTER...
  DULL RESERVOIR...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

RE

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1201 AM MDT MON MAY 24 2010

NEZ002-095-096-240645-
DAWES NE-NORTH SIOUX NE-SOUTH SIOUX NE-
1201 AM MDT MON MAY 24 2010

...SIGNIFICANT WEATHER ADVISORY FOR SIOUX AND DAWES COUNTIES UNTIL
1245 AM MDT...

AT 1157 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 17 MILES NORTHWEST
OF CHADRON 25 MILES NORTHWEST OF SCOTTSBLUFF...MOVING NORTH AT 50
MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THESE STORMS...
ALONG WITH HEAVY RAIN.

LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...
  MOUNT EDNA...
  AGATE...
  NORMAN RESERVOIR...
  AGATE DAM RESERVOIR...
  HARRISON...
  MONTROSE...

THESE STORMS MAY INTENSIFY...AND A SEVERE THUNDERSTORM WATCH IS IN
EFFECT FOR THIS AREA UNTIL 5 AM MDT. BE CERTAIN TO MONITOR LOCAL
RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR
ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES...
IS ALSO POSSIBLE. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY.

RE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
1232 AM MDT MON MAY 24 2010

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

1228 AM     HEAVY RAIN       10 N MITCHELL           42.09N 103.81W
05/24/2010  M0.00 INCH       SIOUX              NE   LAW ENFORCEMENT

            HEAVY RAIN ESTIMATED TO BE AROUND 2 INCHES CAUSED WATER
            TO FLOW OVER A PORTION OF COUNTY ROAD 10 ON THE SIOUX AND
            SCOTTS BLUFF COUNTY LINE.

&&

MWEILAND

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1236 AM MDT MON MAY 24 2010

NEZ002-095-240730-
DAWES NE-NORTH SIOUX NE-
1236 AM MDT MON MAY 24 2010

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN SIOUX AND
NORTHWESTERN DAWES COUNTIES UNTIL 130 AM MDT...

AT 1235 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 7 MILES NORTHWEST OF CRAWFORD...OR 26 MILES
WEST OF CHADRON...MOVING NORTH AT 55 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  NORMAN RESERVOIR...
  AGATE DAM RESERVOIR...
  WOLF BUTTE...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

IN ADDITION...THIS STORM MAY INTENSIFY...AND A SEVERE THUNDERSTORM
WATCH IS IN EFFECT FOR THIS AREA. BE CERTAIN TO MONITOR LOCAL RADIO
AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

MSW