Severe Thunderstorm Warning 62, NWS Cheyenne, WY

Issued

Aug 29, 2002, 3:42 PM MDT (21:42 UTC)

Expired

Aug 29, 2002, 4:15 PM MDT

In force

33 min

Issued by

NWS Cheyenne, WY

Area

Counties, with a storm outline in the text

County Laramie County, WY

The Cheyenne radar (KCYS), 41 km from the middle of the area, began a volume at 21:41 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.

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.

417 
WUUS55 KCYS 292142
SVRCYS
WYC021-292215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
341 PM MDT THU AUG 29 2002

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL LARAMIE COUNTY IN SOUTHEAST WYOMING

* UNTIL 415 PM MDT

* AT 336 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM OVER CENTRAL LARAMIE COUNTY ABOUT 14 MILES
  NORTHEAST OF CHEYENNE...MOVING NORTH AT 15 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 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT 
THURSDAY EVENING FOR SOUTHEAST WYOMING. 

LAT...LON 4157 10474 4129 10477 4137 10426 4156 10427

&&

RE
WCJIN-WYSE

NWS Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 29, 2:10 PM MDT, 1 hour 32 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
210 PM MDT THU AUG 29 2002

WV IMAGERY SHOWING S/WV TROF FROM SOUTH CENTRAL WY-NORTH CENTRAL
CO...WITH SECOND TROF FURTHER WEST OVER UT-SW WY.  18Z META DEPICTS
BOTH OF THESE FEATURES FAIRLY WELL...SHOWING BOTH TROFS EVENTUALLY
MOVING E-NE INTO ERN WY/SW NE BY LATER THIS EVENING.  EVERYTHING IN
PLACE FOR DECENT COVERAGE OF SHWR/TSTM ACTIVITY THIS EVENING...WITH
H8-H7 THETA-E RIDGE OVR SW NE...AND SRN PARTS OF THE AREA IN LFQ OF
60KT H3 JET.  SOME CONCERN ABOUT FLASH FLOOD POTENTIAL OVER SE PARTS
OF THE FA...GIVEN THE PAST 5 DAYS OF LCLY HEAVY RAIN.  AFTER SVRL
PHONE CALLS ACRS SE PARTS OF THE FA...IT WAS DETERMINED THAT MOST
AREAS COULD ABSORB 1-2 INCHES OF ADDITIONAL RAINFALL.  A FEW AREAS
THAT WILL HAVE TO BE MONITORED CLOSELY THIS EVENING INCLUDE ERN
LARAMIE COUNTY AND THE AREA BETWEEN BROADWATER AND LODGEPOLE.  THESE
AREAS REPORT SOME STANDING WATER FROM RECENT RAINS...AND ADDITIONAL
RAINS MAY CAUSE FLOODING PROBLEMS.  I WL NOT ISSUE A FLOOD WATCH
GIVEN THE LOCALIZED PROBLEM AREAS...BUT EVENING CREW WL HAVE
TO MONITOR CLOSELY.  PCPN ENDS SHORTLY AFTER 06Z OVR ERN
AREAS...WITH DOWNWARD MOTION BEHIND MAIN S/WV TROF MVG IN FROM W-E.
FAIRLY QUIET WX FRI-SAT AS UPR FLOW VEERS TO WESTERLY WITH MAINLY
DOWNSLOPE FLOW AND DRY CONDS.  MODELS HINT AT SOME INSTABILITY AND
MSTR ASSOC W/ WEAK VORT MVG OUT OF CO AND INTO FAR SE WY/SRN
PANHANDLE BY SAT EVENING.  GIVEN THE H7-H5 MSTR PROGS AND LI/S OF -1
TO -3...I WL PUT ISOLD STORMS INTO THOSE AREAS.

COOL FRONT SWINGS THRU THE AREA ON SUNDAY...WITH H7 TEMPS COOLING
2-4 DEGC AFT FROPA.  THERE MAY BE A FEW AFTN SHWRS/TSTMS FROM THE
LAR RANGE EASTWARD ON SUNDAY AFTERNOON IN MODERATELY UNSTABLE
AIRMASS AND LOW LVL UPSLOPE FLOW.

.EXTENDED...
COOLER AIR FILTERS ACROSS THE FORECAST AREA DURING THE FIRST PART OF
THE WEEK BEHIND A COLD FRONT.  ONLY A SMALL CHANCE OF SHOWERS OR
THUNDESTORMS MID-WEEK AS WARM AIR STARTS TO PUSH BACK INTO THE AREA.

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

JK/RGB

In the hours before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE, WY
316 PM MDT THU AUG 29 2002

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0935 PM    15 E BOSLER               WY   1.25 INCH HAIL
08/27/02   ALBANY

0945 PM    5 N IRON MOUNTAIN         WY   .75 INCH HAIL
08/27/02   LARAMIE

GRIFFITH

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.