Severe Thunderstorm Warning 209, NWS Cheyenne, WY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
532 PM MDT THU AUG 1 2013

.SHORT TERM...(THIS EVENING THROUGH SATURDAY NIGHT)
ISSUED AT 302 PM MDT THU AUG 1 2013

ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS TODAY AND TONIGHT WITH
SOME SEVERE THUNDERSTORMS EXPECTED. DEVELOPMENT HAS ALREADY
OCCURRED OVER WESTERN PORTIONS OF THE FORECAST AREA. BATCH OF
SHOWERS AND THUNDERSTORMS CURRENTLY OVER ALBANY COUNTY WILL SPREAD
EAST INTO THE PLAINS OVER THE NEXT FEW HOURS. THIS CONVECTION
SHOULD HELP ERODE IF NOT BREAK THE CAP. AT ANY RATE...SHOULD SEE
THE CAP BREAK SOMETIME THIS AFTERNOON WITH STORMS DEVELOPING AND
EVENTUALLY BECOMING SEVERE.

MAIN SEVERE WEATHER THREAT WILL BE LARGE HAIL BUT DAMAGING WINDS
AND A FEW TORNADOES ARE POSSIBLE LATE THIS AFTERNOON AND EVENING.
VERY JUICY AIR IN PLACE AT THIS TIME WITH DEW POINTS MAINLY IN THE
50S TO LOW 60S EAST OF THE LARAMIE RANGE. THE ONE EXCEPTION BEING
AROUND CHEYENNE WHERE A DRY PUNCH DROPPED THE DEW POINTS INTO THE
30S. MU CAPES FROM CURRENT ANALYSIS RUNNING BETWEEN 2000-3000
J/KG...NEARLY DOUBLE THAT OF YESTERDAY BUT WIND PROFILES ARE
SIMILAR. IMPRESSIVE DEEP LAYER SHEAR WITH INCREASING WINDS FROM
THE BOUNDARY LAYER THROUGH THE EQUILIBRIUM LEVEL. THIS WILL
SUPPORT SUPER-CELL THUNDERSTORMS WITH STRONG UPDRAFTS. HAIL SIZES
COULD BE VERY LARGE...CERTAINLY HAIL OVER 2 INCHES IS POSSIBLE AND
COULD SEE A FEW STORMS PRODUCING BASEBALL SIZED HAIL. WIND THREAT
APPEARS TO BE RATHER STANDARD WITH 60-70 MPH WINDS. ALSO...THERE
IS A CHANCE FOR TORNADOES. CURRENTLY A COUPLE BOUNDARIES IN PLACE
OVER THE AREA WHICH COULD BE A FOCUS FOR TORNADIC DEVELOPMENT.
ALSO EASTERLY SURFACE WINDS ARE FORECAST TO INCREASE TO 10 TO 15
MPH BY THIS EVENING. THIS COULD ENHANCE THE TORNADO THREAT FOR A
TIME THIS EVENING. THE HIGHEST TORNADIC THREAT APPEARS TO BE NEAR
A SYNOPTIC BOUNDARY IN THE NORTHERN NEBRASKA PANHANDLE AND
ADJACENT PORTIONS OF EAST CENTRAL WY EARLY THIS EVENING.

MODELS ARE NOW PUSHING THE MAIN AREA OF LOW LEVEL MOISTURE AND
INSTABILITY EAST OF THE FORECAST AREA FOR TOMORROW. THIS WILL
SIGNIFICANTLY REDUCE THE SEVERE THUNDERSTORM POTENTIAL FOR FRIDAY.
MAINLY GARDEN VARIETY SHOWERS AND THUNDERSTORMS FRIDAY WITH THE
ONLY POTENTIAL FOR SEVERE MAY BE THE NORTHERN NEBRASKA PANHANDLE
BUT THAT DEVELOP ON WHERE THE LOW LEVEL BOUNDARY RESIDES. BOUNDARY
IS FORECAST TO SLAM BACK TO THE WEST FRIDAY NIGHT. COULD SEE SOME
FOG AND LOW CLOUDS EAST OF THE LARAMIE RANGE AS THE LOW LEVEL
MOISTURE INCREASES. MORE SHOWERS AND THUNDERSTORMS SATURDAY
AFTERNOON BUT TOUGH TO GUAGE THE STRENGTH AT THIS POINT...BUT
BASED ON CURRENT MODELS COULD SEE A FEW MORE SEVERE THUNDERSTORMS.

.LONG TERM...(SUNDAY THROUGH THURSDAY)
ISSUED AT 302 PM MDT THU AUG 1 2013

AN UPPER RIDGE IS EXPECTED TO HOLD JUST WEST OF THE CWA FOR MUCH
OF THIS PERIOD...EXTENDING BASICALLY FROM TEXAS NNW JUST WEST OF
THE ROCKY MOUNTAIN CHAIN. SUBTROPICAL MOISTURE WILL CONTINUE TO
MOVE UNDER THIS RIDGE FROM THE DESERT SW ACROSS THE REGION WHICH
WILL KEEP AT LEAST WIDELY SCTD MAINLY AFTERNOON AND EVENING
CONVECTION GOING ACROSS THE CWA THROUGH SUNDAY THEN IT MIGHT
BECOME MORE ISOLATED EARLY NEXT WEEK AS THE MOISTURE DECREASES A
BIT. A DECENT PUSH OF COOLER AIR IS DEPICTED TO MOVE INTO THE
REGION MIDWEEK AND SHOULD ALLOW FOR MORE WIDESPREAD SHOWERS AND
STORMS WITH RESULTANT UPSLOPE PATTERN. GFS MAY BE OVERDONE WITH
ITS QPF BUT AT LEAST SCTD POPS LOOK IN ORDER THEN. TEMPERATURES
WARM SUNDAY THROUGH TUESDAY BEFORE TRENDING DOWN WEDNESDAY.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z FRIDAY AFTERNOON)
ISSUED AT 524 PM MDT THU AUG 1 2013

SHOWERS AND THUNDERSTORMS WILL CONTINUE TO IMPACT SOUTHEAST
WYOMING AND THE NEBRASKA PANHANDLE THIS EVENING. SOME
THUNDERSTORMS WILL BE SEVERE WITH LARGE DAMAGING HAIL AND WINDS TO
50 KTS IN THE NEBRASKA PANHANDLE. SHOWERS AND THUNDERSTORMS WILL
NOT BE A STRONG OVER SOUTHEAST WYOMING THIS EVENING BUT GUSTS TO
40 KTS ARE POSSIBLE WITH SOME SHOWERS AND THUNDERSTORMS. STORMS
WILL DECREASE IN COVERAGE AND INTENSITY LATER THIS EVENING. FOG
MAY DEVELOP LATE TONIGHT INTO THE NORTHERN NEBRASKA PANHANDLE.
WINDY FRIDAY FROM MID MORNING THROUGH FRIDAY AFTERNOON OVER
SOUTHEAST WYOMING WITH GUSTS TO 30 KTS.

&&

.FIRE WEATHER...
ISSUED AT 208 PM MDT THU AUG 1 2013

SHOWERS AND THUNDERSTORM CHANCES WILL CONTINUE THROUGH THE WEEKEND
AND INTO EARLY NEXT WEEK. MAIN CHANCES FOR WETTING RAINS WILL OCCUR
OVER THE MOUNTAINS AND EAST OF THE LARAMIE RANGE. SEVERE
THUNDERSTORMS POSSIBLE IN THIS AREA TODAY AND FOR FAR EASTERN
PORTIONS OF THE DISTRICT ON FRIDAY. FURTHER WEST...SOMEWHAT DRIER AND
BREEZY CONDITIONS WILL PREVAIL. MINIMUM HUMIDITIES LOOK TO DROP INTO
THE UPPER TEENS TO LOW 30S WITH SOUTHWEST WINDS GUSTING 20 TO 30 MPH
TODAY AND FRIDAY. LIGHTER WINDS ARE ANTICIPATED FOR THE WEEKEND.
THUNDERSTORM COVERAGE WILL BE MORE WIDELY SCATTERED IN THIS AREA
TODAY...WITH LESS COVERAGE ANTICIPATED FOR FRIDAY.

&&

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

SHORT TERM...LIEBL
LONG TERM...RE
AVIATION...LIEBL
FIRE WEATHER...LIEBL

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
318 PM MDT THU AUG 1 2013

WYZ103>106-109>119-021045-
NORTH LARAMIE RANGE-FERRIS/SEMINOE/SHIRLEY MOUNTAINS-
SHIRLEY BASIN-CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY-
CENTRAL CARBON COUNTY-NORTH SNOWY RANGE FOOTHILLS-
SOUTHWEST CARBON COUNTY-SIERRA MADRE RANGE-
UPPER NORTH PLATTE RIVER BASIN-SNOWY RANGE-LARAMIE VALLEY-
SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS-
CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY-
318 PM MDT THU AUG 1 2013

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

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE
EXPECTED. A FEW STRONG STORMS MAY PRODUCE GUSTY WINDS TO 50 MPH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE EACH
AFTERNOON AND EVENING. NO SEVERE WEATHER IS EXPECTED AT THIS
TIME...HOWEVER LOCALLY HEAVY RAIN AND GUSTY WINDS WILL BE
POSSIBLE WITH SOME OF THE STORMS THIS WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE REQUIRED TODAY AND TONIGHT.

&&

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

NEZ002-003-019>021-054-055-095-096-WYZ101-102-107-108-021045-
DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-
NORTH SIOUX-SOUTH SIOUX-CONVERSE COUNTY LOWER ELEVATIONS-
NIOBRARA COUNTY-EAST PLATTE COUNTY-GOSHEN COUNTY-
318 PM MDT THU AUG 1 2013

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

.DAY ONE...TODAY AND TONIGHT

A SEVERE THUNDERSTORM WATCH IS NOW IN EFFECT FOR PORTIONS OF
SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE UNTIL 10 PM MDT.

SCATTERED THUNDERSTORMS WILL IMPACT PORTIONS OF SOUTHEAST AND
EAST CENTRAL WYOMING...AND THE NEBRASKA PANHANDLE THIS AFTERNOON
AND EVENING. SOME STORMS WILL BECOME SEVERE WITH LARGE HAIL AND
DAMAGING WINDS...ALONG AND EAST OF A LINE FROM DOUGLAS TO WHEATLAND
TO KIMBALL. HAIL UP TO THE SIZE OF TENNIS BALLS IS POSSIBLE SOME
STORMS...WITH THE GREATEST THREAT FOR VERY LARGE HAIL OVER THE
NEBRASKA PANHANDLE. ISOLATED TORNADOES WILL ALSO BE POSSIBLE.

PATCHY LOW CLOUDS AND FOG WILL BE POSSIBLE LATER TONIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE EACH
AFTERNOON AND EVENING. NO SEVERE WEATHER IS EXPECTED AT THIS
TIME...HOWEVER LOCALLY HEAVY RAIN AND GUSTY WINDS WILL BE
POSSIBLE WITH SOME OF THE STORMS THIS WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS EXPECTED BETWEEN 2 PM AND 10 PM.

&&

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

LIEBL

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
538 PM MDT THU AUG 01 2013

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

0523 PM     TSTM WND GST     BUSHNELL                41.23N 103.89W
08/01/2013  E50 MPH          KIMBALL            NE   TRAINED SPOTTER

            HEAVY RAIN WAS ALSO FALLING.

0524 PM     HAIL             BUSHNELL                41.23N 103.89W
08/01/2013  E0.25 INCH       KIMBALL            NE   TRAINED SPOTTER

0526 PM     TSTM WND GST     12 W KIMBALL            41.23N 103.89W
08/01/2013  M62 MPH          KIMBALL            NE   LAW ENFORCEMENT

            ALSO HEAVY RAIN WAS FALLING.

&&

MWEILAND

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
551 PM MDT THU AUG 01 2013

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

0535 PM     TSTM WND GST     3 S KIMBALL             41.19N 103.66W
08/01/2013  M58 MPH          KIMBALL            NE   AWOS

            WINDS OCCURRED AT THE KIMBALL AIRPORT.

&&

MWEILAND

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
551 PM MDT THU AUG 1 2013

WYZ103-107-020045-
EAST PLATTE COUNTY WY-NORTH LARAMIE RANGE WY-
551 PM MDT THU AUG 1 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN PLATTE...EXTREME
SOUTHERN CONVERSE AND EXTREME NORTHEASTERN ALBANY COUNTIES UNTIL 645
PM MDT...

AT 546 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR ESTERBROOK CAMPGROUND...OR 26 MILES SOUTH OF
DOUGLAS...MOVING EAST AT 20 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 55 MPH ARE
EXPECTED WITH THIS STORM.

THIS STORM WILL BE NEAR...
SIBLEY PEAK AROUND 625 PM MDT.
GLENDO AROUND 630 PM MDT.
TWO MOON CAMPGROUND AND GLENDO RESERVOIR AROUND 635 PM MDT.

THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 101 AND
114.

THIS STORM MAY INTENSIFY...AND A SEVERE THUNDERSTORM WATCH IS IN
EFFECT UNTIL 1000 PM 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.

&&

LAT...LON 4261 10488 4232 10478 4236 10537 4239 10539
TIME...MOT...LOC 2351Z 255DEG 19KT 4239 10526

RUBIN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
555 PM MDT THU AUG 1 2013

NEZ003-020045-
BOX BUTTE NE-
555 PM MDT THU AUG 1 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BOX BUTTE COUNTY
UNTIL 645 PM MDT...

AT 551 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR HEMINGFORD...OR 21 MILES NORTHWEST OF
ALLIANCE...MOVING SOUTHEAST AT 15 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  HEMINGFORD...
  WILD HORSE BUTTE...

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.

&&

LAT...LON 4220 10309 4241 10321 4244 10318 4244 10298
      4232 10273 4227 10274
TIME...MOT...LOC 2355Z 312DEG 14KT 4236 10305

HAMMER/RUBIN