Severe Thunderstorm Warning 26, NWS Cheyenne, WY

Issued

Jul 3, 2002, 3:23 PM MDT (21:23 UTC)

Expired

Jul 3, 2002, 4:00 PM MDT

In force

37 min

Issued by

NWS Cheyenne, WY

Area

Counties, with a storm outline in the text

Counties Goshen County, WY, Platte County, WY

The Cheyenne radar (KCYS), 79 km from the middle of the area, began a volume at 21:23 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.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

000 
WUUS55 KCYS 032123
SVRCYS
WYC015-031-032200-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
323 PM MDT WED JUL 3 2002

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN GOSHEN COUNTY IN SOUTHEAST WYOMING
  SOUTHEASTERN PLATTE COUNTY IN SOUTHEAST WYOMING

* UNTIL 400 PM MDT

* AT 318 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 27 MILES WEST OF LA GRANGE...OR ABOUT 26 MILES
  SOUTHEAST OF WHEATLAND...MOVING NORTHEAST AT 20 MPH.

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN
EXCESS OF 55 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

INTENSE LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY
AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF
POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID
USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY
ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN CHEYENNE.

LAT...LON 4197 10495 4166 10471 4161 10406 4200 10412

GRIFFITH

WCJIN-WYSE

NWS Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 3, 1:10 AM MDT, 14 hours 13 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
110 AM MDT WED JUL 3 2002

THE FIRST REAL THREAT OF SHOWERS AND THUNDERSTORMS IN SOME TIME WILL
EXIST OVER THE CWA THIS AFTERNOON AND TONIGHT.  HUMIDITIES THROUGHOUT
THE ATMOSPHERE INCREASE DURING THAT TIME WITH PRECIPITABLE WATER
VALUES OVER AN INCH IN AREAS EAST OF THE LARAMIE RANGE.  A SHORTWAVE
TROUGH OVER NORTHERN ARIZONA EARLY THIS AFTERNOON WILL MOVE OVER THE
CWA SLOWLY THIS AFTERNOON AND TONIGHT.  IN ADDITION...UPPER LEVEL
DIVERGENCE AND MID LEVEL CONVERGENCE WILL BE OVER AREAS EAST OF THE
LARAMIE RANGE.  SOME SEVERE POTENTIAL EXISTS MAINLY IN THE NEBRASKA
PANHANDLE WITH THE DEEPER MOISTURE...BETTER SHEAR AND STEEPER LAPSE
RATES.  WILL GO WITH A 40 OR 50 PERCENT COVERAGE OF SHOWERS AND STORMS
EAST OF THE LARAMIE RANGE THIS AFTERNOON WITH THE ACTIVITY SLOWLY
ENDING FROM WEST TO EAST TONIGHT.  MAIN MODEL DIFFERENCES ARE THE
AVN DEPICTION OF A STRONGER SHORTWAVE TROUGH AND LARGER QPF AMOUNTS
FROM THE ETA.  THE ATMOSPHERE DRIES SOME FOR THURSDAY AND CONTINUING
FOR FRIDAY AND WILL BE MORE STABLE.  MOST OF THE ACTIVITY WILL BE ALONG
AND TO THE EAST OF A SURFACE LOW PRESSURE TROUGH SHICH WILL BE NEAR
THE WYOMING AND COLORADO BORDER THURSDAY AND FRIDAY.  TEMPERATURES WILL
BE A BIT COOLER DURING THE DAY THROUGH FRIDAY WITH MORE CLOUD COVER
AND COOLER 700 MB TEMPERATURES.  WILL TAKE A LOOK AT THE LATER PERIODS
OF THE FORECAST BEFORE THE FORECAST ISSUANCE.

.CYS...
WY...NONE.
NE...NONE.

WEILAND

In the hours before

NEZ001>003-019>021-054-055-WYZ059>070-031830-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1051 AM MDT WED JUL 3 2002

...SPOTTER ACTIVATION MAY BE NEEDED TODAY IN PORTIONS OF SOUTHEAST
WYOMING AND THE WESTERN NEBRASKA PANHANDLE...

SCATTERED THUNDERSTORMS WILL DEVELOP OVER THE MOUNTAINS OF SOUTHEAST
WYOMING THIS AFTERNOON.  THE STORMS WILL MOVE ONTO THE PLAINS WHERE
THE AIRMASS IS UNSTABLE AND THERE IS AMPLE LOW LEVEL MOISTURE.  A FEW
OF THE STORMS MAY BECOME STRONG AND PRODUCE HAIL AND GUSTY WINDS.
THE PRIMARY AREA OF CONCERN WILL BE THE EAST CENTRAL PLAINS OF
WYOMING THIS AFTERNOON...INTO THE NORTHWEST NEBRASKA PANHANDLE THIS
EVENING.

&&

STARK
WCJIN-WYSE-WYNE

Severe Thunderstorm Warnings in Wyoming, 2002Every severe thunderstorm warning in 2002

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