Severe Thunderstorm Warning 22, NWS Riverton, WY

Issued

Jul 22, 2002, 9:43 PM MDT (03:43 UTC)

Expired

Jul 22, 2002, 10:15 PM MDT

In force

32 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 03:44 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.

977 
WUUS55 KRIW 230343
SVRRIW
WYC013-230415-

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

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

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

* UNTIL 1015 PM MDT

* AT 945 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A SEVERE THUNDERSTORM 5 MILES WEST OF SHOSHONI...OR ABOUT 20 MILES
  NORTHEAST OF RIVERTON...MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE...OVER SHOSHONI FROM 950 THROUGH 1015
  PM MDT.  DAMAGING WINDS WERE REPORTED IN RIVERTON EARLIER WITH THIS
  THUNDERSTORM.

THE SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING...
 HAIL UP TO ONE INCH IN DIAMETER.
 DAMAGING WINDS GREATER THAN 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 55 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE
FOR DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

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 4342 10826 4304 10855 4290 10824 4303 10804
          4337 10780

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 13 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.