Severe Thunderstorm Warning 4, NWS Cheyenne, WY

500 
WWUS55 KCYS 172026
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
226 PM MDT FRI MAY 17 2013

NEC013-123-157-165-172115-
/O.CON.KCYS.SV.W.0004.000000T0000Z-130517T2115Z/
BOX BUTTE NE-MORRILL NE-SCOTTS BLUFF NE-SIOUX NE-
226 PM MDT FRI MAY 17 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EXTREME
SOUTHEASTERN SIOUX...NORTHEASTERN SCOTTS BLUFF...NORTHWESTERN MORRILL
AND SOUTHERN BOX BUTTE COUNTIES UNTIL 315 PM MDT...

AT 223 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED 7 MILES NORTHEAST
OF LAKE MINATARE...AND MOVING NORTHEAST AT 20 MPH.

HAZARD...PING PONG BALL SIZE HAIL AND 60 MPH WIND GUSTS.

SOURCE...RADAR INDICATED.

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT HAIL
         DAMAGE TO ROOFS...SIDING...WINDOWS...VEHICLES AND CROPS.
         EXPECT WIND DAMAGE TO ROOFS...SIDING AND TREES.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  KILPATRICK LAKE AROUND 245 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4240 10341 4207 10283 4190 10340 4196 10352
TIME...MOT...LOC 2027Z 224DEG 17KT 4203 10339

HAIL...1.50IN
WIND...60MPH

$$

LIEBL

189 
WWUS55 KCYS 172036
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
236 PM MDT FRI MAY 17 2013

NEC157-172045-
/O.CAN.KCYS.SV.W.0004.000000T0000Z-130517T2115Z/
SCOTTS BLUFF NE-
236 PM MDT FRI MAY 17 2013

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SCOTTS BLUFF
COUNTY IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA. MORE STORMS ARE POSSIBLE THIS AFTERNOON. 

LAT...LON 4207 10283 4192 10334 4196 10337 4200 10336
      4200 10340 4213 10349 4240 10341
TIME...MOT...LOC 2035Z 224DEG 17KT 4206 10335

$$

NEC013-123-165-172115-
/O.CON.KCYS.SV.W.0004.000000T0000Z-130517T2115Z/
BOX BUTTE NE-MORRILL NE-SIOUX NE-
236 PM MDT FRI MAY 17 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EXTREME
SOUTHEASTERN SIOUX...NORTHWESTERN MORRILL AND SOUTHERN BOX BUTTE
COUNTIES UNTIL 315 PM MDT...

AT 232 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR KILPATRICK
LAKE...AND MOVING NORTHEAST AT 20 MPH.

HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.

SOURCE...RADAR INDICATED.

IMPACT...HAIL DAMAGE TO VEHICLES AND CROPS IS EXPECTED. EXPECT WIND
         DAMAGE TO ROOFS...SIDING AND TREES.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  KILPATRICK LAKE AROUND 245 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4207 10283 4192 10334 4196 10337 4200 10336
      4200 10340 4213 10349 4240 10341
TIME...MOT...LOC 2035Z 224DEG 17KT 4206 10335

HAIL...1.00IN
WIND...60MPH

$$

LIEBL

461 
WWUS55 KCYS 172101
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
301 PM MDT FRI MAY 17 2013

NEC123-165-172111-
/O.CAN.KCYS.SV.W.0004.000000T0000Z-130517T2115Z/
MORRILL NE-SIOUX NE-
301 PM MDT FRI MAY 17 2013

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME SOUTHEASTERN SIOUX AND
NORTHWESTERN MORRILL COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4207 10283 4201 10306 4201 10331 4207 10339
      4234 10331
TIME...MOT...LOC 2101Z 210DEG 29KT 4215 10308

$$

NEC013-172115-
/O.CON.KCYS.SV.W.0004.000000T0000Z-130517T2115Z/
BOX BUTTE NE-
301 PM MDT FRI MAY 17 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN BOX
BUTTE COUNTY UNTIL 315 PM MDT...

AT 300 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED 7 MILES SOUTHWEST
OF BEREA...AND MOVING NORTHEAST AT 35 MPH.

HAZARD...QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...DAMAGE TO VEHICLES AND CROPS IS EXPECTED.

THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF SOUTHERN
BOX BUTTE COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4207 10283 4201 10306 4201 10331 4207 10339
      4234 10331
TIME...MOT...LOC 2101Z 210DEG 29KT 4215 10308

HAIL...1.00IN
WIND...<50MPH

$$

LIEBL

309 
WWUS55 KCYS 172114
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
314 PM MDT FRI MAY 17 2013

NEC013-172123-
/O.EXP.KCYS.SV.W.0004.000000T0000Z-130517T2115Z/
BOX BUTTE NE-
314 PM MDT FRI MAY 17 2013

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN BOX BUTTE COUNTY WILL
EXPIRE AT 315 PM MDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA. A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN 
BOX BUTTE COUNTY. 

LAT...LON 4207 10283 4201 10306 4201 10331 4207 10339
      4234 10331
TIME...MOT...LOC 2113Z 210DEG 29KT 4223 10301

$$

LIEBL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
120 PM MDT FRI MAY 17 2013

.SHORT TERM...(THIS EVENING THROUGH SATURDAY)
ISSUED AT 1240 PM MDT FRI MAY 17 2013

QUITE INTERESTING WEATHER SCENARIO SHAPING UP FOR THIS AFTERNOON
AND EVENING. 18Z...NOON...DEWPOINT DISCONTINUITY AND PSEUDO
DRYLINE ALREADY SHOWING UP FROM EAST OF CHEYENNE TO SOUTH OF
DOUGLAS...WITH SURFACE DEWPOINTS ONLY IN THE LOWER TO MID 20S WEST
OF THIS DRYLINE FEATURE...AND UPPER 40S TO LOWER 50S DEWPOINTS
EAST OF THE DRYLINE AT DOUGLAS...TORRINGTON...CHADRON...
SCOTTSBLUFF...ALLIANCE...KIMBALL AND SIDNEY.

FOR THIS AFTERNOON...VISIBLE SATELLITE IMAGERY SHOWING A WELL
PRONOUNCED FULL SUN AREA OVER THE SOUTHEAST HALF OF OUR COUNTIES.
WATER VAPOR IMAGERY SHOWING A WELL PRONOUNCED DRY SLOT WORKING
NORTHEASTWARD ACROSS NORTHERN COLORADO AND SOUTHEAST WYOMING
WITH ASSOCIATED SHORTWAVE TROUGH ALOFT WORKING NORTHEAST.

LATE THIS AFTERNOON...NORTH TO SOUTH ORIENTED SURFACE TROUGH WILL
EXTEND FROM RAPID CITY...ALONG THE WYOMING-NEBRASKA STATE LINE
INTO EASTERN COLORADO. WARM MID LEVEL TEMPERATURES...700 MB
TEMPERATURES NEAR 12 CELSIUS...LIKELY WILL PROVIDE ENOUGH
CONVECTIVE INHIBITION...CIN...TO LIMIT ANY CONVECTIVE POTENTIAL
ALONG AND EAST OF THE DRYLINE FEATURE UNTIL AFTER 3 PM...AS
LOW LEVEL NEGATIVE THETA-E ADVECTION WILL BE NOTED ALONG AND
WEST OF THE DRYLINE WITH NEUTRAL OR SLIGHT NEGATIVE THETA-E
ADVECTION AT MID LEVELS...700 MB. TO ACCOUNT FOR POSSIBLE
CONVECTIVE INITIATION AFTER 3 PM...OUR TEAM ADDED MENTION OF
ISOLATED THUNDERSTORM EAST OF A LUSK TO KIMBALL LINE...IN CASE
CONVECTIVE INHIBITION...CIN...CAN BE ERODED SUFFICIENTLY. WE
CONCUR WITH STORM PREDICTION CENTER DAY 1 OUTLOOK AND THEIR
REASONING.

FOR THIS EVENING...LOW LEVEL WINDS OVER FAR EASTERN WYOMING
AND WESTERN NEBRASKA WILL BACK...ADVECTING LOW LEVEL MOISTURE
NORTHWESTWARD ROUGHLY EAST OF A LUSK TO PINE BLUFFS LINE...
AND SETTING UP A DECENT LOW LEVEL CONVERGENCE AXIS ALONG AND
EAST OF THE WYOMING AND NEBRASKA STATE LINE. BOTH THE NAM AND
GFS GIVE INDICATIONS THAT CONVECTIVE INITIATION WILL TAKE PLACE
MORE ROBUSTLY AFTER 6 PM THIS EVENING ALONG AND EAST OF THE
WYOMING-NEBRASKA STATE LINE...THUS WE HAVE INCLUDED ISOLATED
TO SCATTERED THUNDERSTORMS THROUGH 9 PM ALONG AND EAST OF THE
STATE LINE...WITH A FEW STORMS POSSIBLY SEVERE DUE TO ADEQUATE
SHEAR AND INSTABILITY.

.LONG TERM...(MONDAY THROUGH THURSDAY)
ISSUED AT 345 AM MDT FRI MAY 17 2013

MODELS HAVING SOME DIFFICULTY WITH THE MOVEMENT OF THE UPPER
SYSTEM AFFECTING THE REGION MONDAY...WITH THE GFS MORE PROGRESSIVE
THAN THE ECMWF. REMAINING COOL TO MILD MONDAY AND TUESDAY WITH
DECENT CHANCES FOR SHOWERS AND A FEW STORMS. DRIER AND WARMER WEDS
INTO THURSDAY WITH UPPER FLOW GRADUALLY BACKING TO SW AHEAD OF
NEXT UPPER LOW THAT WILL DROP OVER THE PACIFIC NW WEDS. SHOULD SEE
AN UPTICK IN CONVECTION LATE WEDS AND THURSDAY AS ANY IMPULSES
EJECT NORTHEAST FROM THIS SYSTEM AND ACROSS THE CWA.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z SATURDAY MORNING)
ISSUED AT 1240 PM MDT FRI MAY 17 2013

21Z TO 00Z...ISOLATED THUNDERSTORMS DEVELOPING EAST OF A LUSK
TO KIMBALL LINE. SOUTH TO SOUTHWEST WINDS GUSTING UP TO 38 KNOTS
AT AERODROMES. VFR PREVAILING OUTSIDE OF THUNDERSTORMS WITH
SCATTERED TO BROKEN CLOUDS AT OR ABOVE 8000 FEET AGL.

00Z TO 06Z...ISOLATED TO SCATTERED THUNDERSTORMS DEVELOPING AND
INCREASING IN COVERAGE EAST OF A LUSK TO KIMBALL LINE WITH A
FEW STORMS POSSIBLY SEVERE EARLY IN THE EVENING OVER WESTERN
NEBRASKA AND EASTERN NIOBRARA COUNTY...PRODUCING SEVERE
TURBULENCE...POSSIBLE STRONG WINDS...HAIL AND HEAVY RAIN.
ELSEWHERE...VFR PREVAILS WITH WINDS VEERING TO WEST AND
DECREASING.

AFTER 06Z...VFR WITH DECREASING CLOUDINESS.

&&

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

SHORT TERM...RUBIN
LONG TERM...HAMMER
AVIATION...RUBIN

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
144 PM MDT FRI MAY 17 2013

WYZ101>119-181445-
CONVERSE COUNTY LOWER ELEVATIONS-NIOBRARA COUNTY-
NORTH LARAMIE RANGE-FERRIS/SEMINOE/SHIRLEY MOUNTAINS-
SHIRLEY BASIN-CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY-
EAST PLATTE COUNTY-GOSHEN 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-
144 PM MDT FRI MAY 17 2013

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

ISOLATED NON-SEVERE THUNDERSTORMS WILL DEVELOP AFTER 3 PM EAST OF A
LUSK TO TORRINGTON LINE. STORM MOVEMENT WILL BE TO THE NORTHEAST AT
20 MPH.

ISOLATED THUNDERSTORMS WILL CONTINUE EAST OF A LUSK TO TORRINGTON
LINE FROM 6 PM TO 9 PM...WITH A FEW SEVERE THUNDERSTORMS POSSIBLE
OVER EASTERN NIOBRARA COUNTY...PRODUCING ONE INCH DIAMETER HAIL OR
LARGER AND WIND GUSTS IN EXCESS OF 60 MPH.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

ISOLATED TO SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE
EXPECTED MAINLY SATURDAY THROUGH MONDAY. SEVERE STORMS ARE NOT
ANTICIPATED AT THIS TIME.

.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

NEZ002-003-019>021-054-055-095-096-181445-
DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-
NORTH SIOUX-SOUTH SIOUX-
144 PM MDT FRI MAY 17 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA
PANHANDLE.

.DAY ONE...THIS AFTERNOON AND TONIGHT

ISOLATED THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS AFTERNOON WITH
STORM MOVEMENT TO THE NORTHEAST AT 20 MPH. A FEW OF THE THUNDERSTORMS
NORTH OF A LUSK TO ALLIANCE LINE MAY BECOME SEVERE AFTER 3
PM...PRODUCING QUARTER SIZE HAIL OR LARGER...OR WIND GUSTS IN EXCESS
OF 60 MPH.

THUNDERSTORMS MAY INCREASE IN COVERAGE AND INTENSITY BETWEEN 6 PM
AND 9 PM THIS EVENING...WITH A FEW SEVERE THUNDERSTORMS POSSIBLE
EAST OF A LUSK TO KIMBALL LINE...PRODUCING QUARTER SIZE HAIL OR
LARGER OR WIND GUSTS IN EXCESS OF 60 MPH. STORM MOVEMENT WILL BE TO
THE NORTHEAST AT 25 MPH.

AFTER 9 PM THIS EVENING...ISOLATED TO SCATTERED THUNDERSTORMS WILL
DECREASE IN COVERAGE AND INTENSITY AS STORMS PROPAGATE NORTHEASTWARD
WITH ANY THUNDERSTORMS ENDING FROM CHADRON TO SIDNEY BY OR NEAR
MIDNIGHT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS SATURDAY AFTERNOON
AND EVENING. SCATTERED AFTERNOON AND EVENING THUNDERSTORMS WILL
OCCUR ON SATURDAY.

ISOLATED TO SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE
EXPECTED MAINLY SUNDAY AND MONDAY. SEVERE STORMS ARE NOT ANTICIPATED
AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED FOR THE PANHANDLE THIS AFTERNOON
FROM 3 PM THROUGH 9 PM THIS EVENING FOR AREAS ALONG AND EAST OF A
LINE FROM LUSK TO KIMBALL...WITH THE GREATEST THREAT AREA EAST OF A
HARRISON TO SIDNEY LINE.

&&

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

RUBIN