Alert archive / Wyoming / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 168, NWS Cheyenne, WY

July 21, 2013Converse County, Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 21, 2013, 6:34 PM MDT for Converse County, Niobrara County, Wyoming. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 21, 2013, 6:34 PM MDT (00:34 UTC)
Expired
Jul 21, 2013, 7:15 PM MDT
In force
41 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon
Hail
1.75 in
Wind
60.0 mph

Counties Converse County, WY, Niobrara County, WY

The radar

The Cheyenne radar (KCYS), 208 km from the middle of the area, began a volume at 00:36 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 21, 3:17 PM MDT, 3 hours 17 minutes earlier.

Area forecast discussion, Jul 21, 3:17 PM MDT, 3 hours 17 minutes before
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Hazardous weather outlook, Jul 21, 3:20 PM MDT, 3 hours 14 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
320 PM MDT SUN JUL 21 2013

WYZ101-103>107-109>118-220930-
CONVERSE COUNTY LOWER ELEVATIONS-NORTH LARAMIE RANGE-
FERRIS/SEMINOE/SHIRLEY MOUNTAINS-SHIRLEY BASIN-
CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY-
EAST 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-
320 PM MDT SUN JUL 21 2013

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

VERY DRY CONDITIONS ARE EXPECTED THIS AFTERNOON FOR CARBON COUNTY
AND AREAS WEST OF THE LARAMIE RANGE. AFTERNOON HUMIDITIES ARE
EXPECTED TO FALL INTO THE SINGLE DIGITS. WINDS ARE EXPECTED TO
GUSTS TO 30 TO 35 MPH THIS AFTERNOON. CRITICAL FIRE WEATHER
CONDITIONS ARE EXPECTED FOR CARBON COUNTY AND PORTIONS OF EXTREME
WESTERN ALBANY COUNTY. RED FLAG WARNINGS HAVE BEEN POSTED UNTIL
6 PM FOR THOSE AREAS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

SIMILAR FIRE WEATHER CONDITIONS CAN BE EXPECTED MONDAY WITH
SLIGHTLY STRONGER WINDS. A FIRE WEATHER WATCH HAS BEEN POSTED FOR
CARBON COUNTY AND EXTREME WESTERN ALBANY COUNTY FOR MONDAY.

MONSOONAL MOISTURE RETURNS TO THE AREA WEDNESDAY NIGHT INTO
THURSDAY WHICH WILL HELP DEVELOP SCATTERED THUNDERSTORMS DURING
THIS TIME. AT THIS TIME...THESE THUNDERSTORMS ARE NOT EXPECTED TO
BECOME SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE REQUIRED THIS AFTERNOON OR 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-WYZ102-108-119-220930-
DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-
NORTH SIOUX-SOUTH SIOUX-NIOBRARA COUNTY-GOSHEN COUNTY-
EAST LARAMIE COUNTY-
320 PM MDT SUN JUL 21 2013

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

WIDELY SCATTERED THUNDERSTORMS ARE ONCE AGAIN EXPECTED THROUGH
THE EVENING OVER MAINLY THE NORTHERN PART OF THE NEBRASKA PANHANDLE.
SOME OF THE STORMS MAY PRODUCE GUSTY WINDS...A PERIOD OF MODERATE
RAIN AND SMALL HAIL.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

ISOLATED THUNDERSTORMS ARE EXPECTED MONDAY AND TUESDAY
AFTERNOON...MAINLY ACROSS THE NORTHERN PANHANDLE. THESE
THUNDERSTORMS ARE NOT EXPECTED TO BECOME SEVERE AT THIS TIME.

A MORE WIDESPREAD THUNDERSTORM EVENT LOOKS TO TAKE SHAPE
WEDNESDAY NIGHT AND PERSIST INTO FRIDAY AS MONSOONAL MOISTURE
RETURNS TO THE AREA. ITS STILL TO EARLY TO DETERMINE WHETHER THESE
THUNDERSTORMS WILL BE SEVERE AT THIS POINT AND WHERE THEY WILL
FORM.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED THIS AFTERNOON AND TONIGHT.

&&

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

WEILAND

In the hours before

Special weather statement, Jul 21, 4:58 PM MDT, 1 hour 36 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
458 PM MDT SUN JUL 21 2013

WYZ110-220000-
NORTH SNOWY RANGE FOOTHILLS-
INCLUDING THE CITIES OF...ARLINGTON...ELK MOUNTAIN
458 PM MDT SUN JUL 21 2013

...STRONG AND GUSTY WINDS AFFECTING THE NORTH SNOWY RANGE FOOTHILS
LATE THIS AFTERNOON...

SUSTAINED WESTERLY WINDS OF 25 TO 35 MPH WILL GUST TO 50 MPH AT
TIMES LATE THIS AFTERNOON...AFFECTING THE INTERSTATE 80 CORRIDOR
WEST OF LARAMIE TO ARLINGTON. THIS INCLUDES HALLECK RIDGE AND ELK
MOUNTAIN.

THE WYOMING DEPARTMENT OF TRANSPORTATION ADVISES NO LIGHT TRAILER
TRAFFIC DUE TO WIND SPEEDS ABOVE 50 MPH. THESE WINDS MAY CAUSE
LOSS OF VEHICLE CONTROL OR A BLOW OVER TO HIGH PROFILE VEHICLES
TRAVELING EMPTY OR WITH A LIGHT LOAD. DRIVERS OF SUCH VEHICLES ARE
ADVISED TO DELAY TRAVEL.

JAMSKI
Special weather statement, Jul 21, 5:30 PM MDT, 1 hour 4 minutes before
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Local storm report, Jul 21, 5:51 PM MDT, 43 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
551 PM MDT SUN JUL 21 2013

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

0544 PM     HAIL             BILL                    43.21N 105.26W
07/21/2013  E2.75 INCH       CONVERSE           WY   TRAINED SPOTTER

            HAIL UP TO BASEBALL SIZE BETWEEN 544 AND 549 PM MDT.

&&

HAMMER
Special weather statement, Jul 21, 6:29 PM MDT, 5 minutes before
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Special weather statement, Jul 21, 6:31 PM MDT, 3 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
631 PM MDT SUN JUL 21 2013

WYZ107-220100-
EAST PLATTE COUNTY WY-
631 PM MDT SUN JUL 21 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN PLATTE COUNTY UNTIL 700
PM MDT...

AT 627 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 5 MILES NORTHWEST OF SIBLEY PEAK...OR 24 MILES
SOUTHEAST OF DOUGLAS...MOVING SOUTHEAST AT 20 MPH.

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

THIS STORM WILL BE NEAR...
SIBLEY PEAK AROUND 640 PM MDT.
GLENDO RESERVOIR AND TWO MOON CAMPGROUND AROUND 650 PM MDT.

THIS STORM MAY INTENSIFY...SO 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 4248 10483 4228 10500 4243 10522 4255 10512
TIME...MOT...LOC 0031Z 301DEG 16KT 4246 10510

JAMSKI

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 21, 6:29 PM MDTSpecial Weather StatementCYSNiobrara31 min
Jul 21, 6:31 PM MDTSpecial Weather StatementCYSPlatte29 min
Jul 21, 6:59 PM MDTRed Flag WarningCYS24 hr
Jul 21, 7:02 PM MDTSpecial Weather StatementCYSPlatte28 min
Jul 21, 7:10 PM MDTSpecial Weather StatementCYSNiobrara35 min
Jul 21, 7:20 PM MDTSpecial Weather StatementCYSNiobrara25 min
Jul 21, 7:48 PM MDTSpecial Weather StatementCYSGoshen27 min
Jul 21, 7:56 PM MDTSpecial Weather StatementCYSNiobrara34 min
Jul 21, 7:14 PM MDTSpecial Weather StatementCYSSioux31 min
Jul 21, 8:16 PM MDTSpecial Weather StatementCYSSioux29 min
Jul 21, 8:48 PM MDTSpecial Weather StatementCYSBox Butte, Dawes27 min
Jul 21, 9:54 PM MDTSpecial Weather StatementCYSBox Butte66 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2013Every severe thunderstorm warning in 2013

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.