Alert archive / Wyoming / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 14, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jun 26, 2001, 3:03 PM MDT for Natrona County, Wyoming. It was in force for 57 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jun 26, 2001, 3:03 PM MDT (21:03 UTC)
- Expired
- Jun 26, 2001, 4:00 PM MDT
- In force
- 57 min
- Issued by
- NWS Riverton, WY
- Area
- Whole counties
County Natrona County, WY
The radar
The Riverton/Lander radar (KRIW), 137 km from the middle of the area, began a volume at 21:04 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 26, 3:25 PM MDT | Tornado F0 | Alcova, WY | |
| Jun 26, 3:45 PM MDT | Hail 0.75 | Casper, WY |
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.
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 9.1 hours before the alert went out and 131 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1851 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 64 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 Riverton, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 26, 1:00 PM MDT, 2 hours 3 minutes earlier.
Area forecast discussion, Jun 26, 1:00 PM MDT, 2 hours 3 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 1 PM MDT TUE JUN 26 2001 ISOLD CNVCTN FIRING UP AT 1230 PM THIS AFTN WITH AN OTHERWISE FAIR SKY. ETA/AVN MDLS IN AGRMNT WITH MAIN FTRS THIS RUN...BUT THE ETA HNDLG SHORT TERM DETAILS BTR. LOW LVL CNVRGNC ZONE OVR CNTRL FCST AREA THIS AFTN WITH SHT/WVS MOVG UP FM THE SOUTH WILL KICK OFF CNVCTN THIS AFTN. DWPTS ARE RISING WITH LOW LVL MSTR FLUX FM THE SE...SO THESE STRMS SHOULD HAVE SOME HEAVY SHWRS AND HAIL. THETA-E RDG THRU THIS EVG AT H8 RUNS OVR MAINLY THE FAR E AND STRETCHES TO THE NRN AND NE FCST AREAS. WITH THE RMNTS OF THE SRN CA UPR LOW MOVG INTO THE SW LT TNGHT WILL KEEP TSTMS GOING ALL NIGHT. WITH A SFC LOW DVLPG OVR SW WY THIS AFTN THEN INTO CNTRL WY BY THIS EVG XCPT INCRS SW WNDS BHND THE LOW ESPCLY ON WED AS THE LOW REACHS THE XTRM N-NE BY 12Z. MAIN CHG TO FCST WILL BE TO BUMP UP POPS INTO HIGH SCT RNG FOR THIS EVG. FOR WED THE UPR RDG STARTS BLDG FM THE SW AND WILL GO WITH ONLY ISOLD SHWRS OVR THE CNTRL-SW WITH SCT TSTMS OVR THE N-NE-E AND SCT SHWRS NW. FOR THUR THE RDG CONTS TO BLD OVR THE FCST AREA AND WILL GO WITH ONLY ISOLD PM TSTMS HIGHER TRRN. AS FOR TMPS WED WILL UNDERCUT GUICDANCE SM AND CONT TMPS SMLR TO TODAY OR A LTL WARMER...AND THEN FOR THUR A FEW DEGS WARMER. XTNDD FCST ON TRAK WITH HOT AND DRY WITH SLGHT CHC PM TSTMS MAINLY HIGHER TRRN AS RDG CONTS TO BLD OVR THE CNTRL RCKYS. RWM .RIW...NONE.
In the hours before
Special weather statement, Jun 26, 10:36 AM MDT, 4 hours 27 minutes before
WYZ002>005-008>015-019-020-022>028-270130- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 1036 AM MDT TUE JUN 26 2001 THE SEVERE WEATHER POTENTIAL IN WESTERN AND CENTRAL WYOMING WILL BE SLIGHT THIS AFTERNOON AND EVENING. SPOTTER ACTIVATION MAY BE NECESSARY LATER TODAY. DISCUSSION... INCREASING SUBTROPICAL MOISTURE FROM THE SOUTH TODAY WILL BRING SCATTERED THUNDERSTORMS TO THE REGION LATE THIS AFTERNOON AND EVENING. THERE IS A SLIGHT CHANCE THAT SOME OF THESE STORMS WILL PRODUCE LARGE HAIL AND DAMAGING WINDS. THE MAIN THREAT OVER SWEETWATER AND SUBLETTE COUNTIES WILL BE DAMAGING WINDS AS THERE IS LITTLE CHANCE FOR LARGE HAIL. THIS OUTLOOK IS FOR THE FOLLOWING COUNTIES IN WESTERN AND CENTRAL WYOMING BIG HORN FREMONT HOT SPRINGS JOHNSON NATRONA PARK SUBLETTE SWEETWATER WASHAKIE RWM WCJIN-WYNW-WYSW-WYNE
Special weather statement, Jun 26, 12:45 PM MDT, 2 hours 18 minutes before
WYZ002>005-008>015-019-020-022>028-262200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 1245 PM MDT TUE JUN 26 2001 ...SEVERE WEATHER OUTLOOK... THE SEVERE WEATHER POTENTIAL IN WESTERN AND CENTRAL WYOMING WILL BE SLIGHT THIS AFTERNOON AND EVENING. SPOTTER ACTIVATION MAY BE NECESSARY LATER TODAY. DISCUSSION... INCREASING SUBTROPICAL MOISTURE FROM THE SOUTH TODAY WILL BRING SCATTERED THUNDERSTORMS TO THE REGION LATE THIS AFTERNOON AND EVENING. THERE IS A SLIGHT CHANCE THAT SOME OF THESE STORMS WILL PRODUCE LARGE HAIL AND DAMAGING WINDS. THE MAIN THREAT OVER SWEETWATER AND SUBLETTE COUNTIES WILL BE DAMAGING WINDS AS THERE IS LITTLE CHANCE FOR LARGE HAIL. THIS OUTLOOK IS FOR THE FOLLOWING COUNTIES IN WESTERN AND CENTRAL WYOMING BIG HORN FREMONT HOT SPRINGS JOHNSON NATRONA PARK SUBLETTE SWEETWATER WASHAKIE RWM WCJIN-WYNW-WYSW-WYNE
Special weather statement, Jun 26, 12:45 PM MDT, 2 hours 18 minutes before
WYZ002>005-008>015-019-020-022>028-262200- SEVERE WEATHER OUTLOOK...RETRANSMISSION NATIONAL WEATHER SERVICE RIVERTON WY 1245 PM MDT TUE JUN 26 2001 THE SEVERE WEATHER POTENTIAL IN WESTERN AND CENTRAL WYOMING WILL BE SLIGHT THIS AFTERNOON AND EVENING. SPOTTER ACTIVATION MAY BE NECESSARY LATER TODAY. DISCUSSION... INCREASING SUBTROPICAL MOISTURE FROM THE SOUTH TODAY WILL BRING SCATTERED THUNDERSTORMS TO THE REGION LATE THIS AFTERNOON AND EVENING. THERE IS A SLIGHT CHANCE THAT SOME OF THESE STORMS WILL PRODUCE LARGE HAIL AND DAMAGING WINDS. THE MAIN THREAT OVER SWEETWATER AND SUBLETTE COUNTIES WILL BE DAMAGING WINDS AS THERE IS LITTLE CHANCE FOR LARGE HAIL. THIS OUTLOOK IS FOR THE FOLLOWING COUNTIES IN WESTERN AND CENTRAL WYOMING BIG HORN FREMONT HOT SPRINGS JOHNSON NATRONA PARK SUBLETTE SWEETWATER WASHAKIE RWM WCJIN-WYNW-WYSW-WYNE
Special weather statement, Jun 26, 2:25 PM MDT, 38 minutes before
WYZ015-262130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 225 PM MDT TUE JUN 26 2001 ...THUNDERSTORMS MOVING TOWARDS ALCOVA AND PATHFINDER RESERVOIRS IN SOUTHERN NATRONA COUNTY... AT 225 PM MDT...RIVERTON DOPPLER RADAR SHOWED A CLUSTER OF THUNDERSTORMS OVER CARBON COUNTY...MOVING NORTH TOWARDS ALCOVA AND PATHFINDER RESERVOIRS IN SOUTHERN NATRONA COUNTY. THESE THUNDERSTORMS WILL BE AFFECTING THESE RECREATIONAL AREAS FOR THE NEXT SEVERAL HOURS...SO BOATERS AND OTHERS NEAR THE WATER SHOULD TAKE SHELTER AS SOON AS POSSIBLE. FREQUENT LIGHTNING...GUSTY WINDS... BRIEF HEAVY RAIN AND POSSIBLY HAIL WILL ACCOMPANY THESE STORMS. CONTINUE TO LISTEN TO THIS \STATION FOR LATER STATEMENTS AND POSSIBLE WARNINGS. DN WCJIN-WYNE
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 26, 3:25 PM MDT | Tornado Warning | RIW | Natrona | 35 min |
| Jun 26, 5:11 PM MDT | Severe Thunderstorm Warning | RIW | Fremont, Hot Springs | 49 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2001Every severe thunderstorm warning in 2001
Sources
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.