Severe Thunderstorm Warning 23, NWS Riverton, WY

Issued

Jul 22, 2002, 10:15 PM MDT (04:15 UTC)

Expired

Jul 22, 2002, 10:45 PM MDT

In force

30 min

Issued by

NWS Riverton, WY

Area

Whole counties

County Fremont County, WY

The Riverton/Lander radar (KRIW), 13 km from the middle of the area, began a volume at 04:14 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.

743 
WUUS55 KRIW 230415
SVRRIW
WYC013-230445-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
1015 PM MDT MON JUL 22 2002

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL FREMONT COUNTY IN CENTRAL WYOMING

* UNTIL 1045 PM MDT

* AT 1015 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
  A SEVERE THUNDERSTORM OVER EAST CENTRAL FREMONT COUNTY...OR ABOUT  
  30 MILES NORTHEAST OF RIVERTON...MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  OVER RURAL EASTERN FREMONT COUNTY IN CENTRAL WYOMING THROUGH 1045 
  PM MDT...INCLUDING LYSITE AND MONETA.

THE SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING...
 HAIL UP TO THE SIZE OF NICKELS.
 WINDS UP TO 60 MILES AN HOUR.
 FREQUENT CLOUD-TO-GROUND LIGHTNING.

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 60 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 RIVERTON.



$$
LAT...LON 4337 10800 4309 10800 4305 10754 4337 10754

C. BAKER

WCJIN-WYNW

NWS Riverton, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 22, 2:30 PM MDT, 7 hours 45 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
230 PM MDT MON JUL 22 2002

IN THE SHORT TERM AFT/EVE CONVECTION WILL MOVE ACROSS THE NORTH HALF
OF THE AREA. SEEMS TO BE A DISTURBANCE EJECTING OUT OF UPPER
CIRCULATION. STORMS ALREADY GOING IN N UT/S ID AND THIS AREA WILL
EXPAND OVER W WY AND INTO N/CENT WY DURING THE EVE. UPPER JET MERGE
OVER NRN WY ALSO A CONCERN THAT COULD AID IN STORM STRENGTH. SO POPS
HIGHEST IN THE N AND LESSER IN THE SOUTH. ON TUE MODELS WISH TO BRING
DRIER AIR INTO THE AREA IN WSW ALOFT. BIG QUESTION IS HOW MUCH WILL
DEWPOINTS DROP IN THE ZONES. APPEARS A BOUNDARY WILL EXIST IN CENT
WY WHICH WOULD BE FOCUS FOR STORMS TO DEVELOP. ATTM WANT TO KEEP
ISOLATED TO SCT POPS IN MANY PLACES AND KEEP SW ZONES DRY. BREEZY AS
WELL IN FAVORED AREAS FROM KRKS TO KCPR. HIGH TEMPS TUE SOME 4 TO 8
DEGREES HIGHER THAN TDY. LOW POPS IN THE N AND E FOR TUE NT WITH DRY
WEATHER ELSEWHERE. WED LOOKS RATHER SIMILAR TO TUE WITH BOUNDARY NOT
MOVING MUCH. THUS WILL TREND POPS ALONG THE SAME AREAS. LITTLE
CHANGE IN HIGH TEMPS. ON THU 12Z AVN WANTS TO BRING A DISTURBANCE
THROUGH THE AREA WITH INCREASED MOISTURE. SO SCATTERED POPS ALL
AREAS SEEM BEST FOR NOW. A TAD COOLER DUE TO MORE CLOUDS AROUND.
THE FRI THROUGH MON PERIOD FEATURES A WNW FLOW ALOFT WITH A SERIES
OF SHORTWAVES MOVING THROUGH. FORECAST OF POPS IS BASED ON CURRENT
MODEL TIMING OF THESE FEATURES. LITTLE CHANGE IN TEMPS DURING THE
PERIOD.

.RIW...NONE.

AR

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.