Alert archive / Wyoming / Tornado Warnings in 2001
Tornado Warning 4, NWS Riverton, WY
NWS Riverton, WY issued this tornado warning at Jul 4, 2001, 2:43 PM MDT for Johnson County, Wyoming. It was in force for 32 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
- Jul 4, 2001, 2:43 PM MDT (20:43 UTC)
- Expired
- Jul 4, 2001, 3:15 PM MDT
- In force
- 32 min
- Issued by
- NWS Riverton, WY
- Area
- Whole counties
County Johnson County, WY
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 4, 3:10 PM MDT | Hail 0.88 | Sussex, WY | |
| Jul 4, 3:25 PM MDT | Hail 0.88 | Sussex, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 4, 2:15 PM MDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 8.7 hours before the alert went out and 182 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
- 271 J/kg
- Mixed-layer CIN
- -288 J/kg
- Mixed-layer LCL
- 1924 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -60 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS55 KRIW 042044 TORRIW WYC019-042115- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE RIVERTON WY 243 PM MDT WED JUL 4 2001 THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A * TORNADO WARNING FOR... SOUTHEASTERN JOHNSON COUNTY IN NORTH CENTRAL WYOMING * UNTIL 315 PM MDT * AT 243 PM MDT...LOCAL LAW ENFORCEMENT REPORTED A SEVERAL FUNNEL CLOUDS 15 MILES NORTH OF SUSSEX...OR ABOUT 36 MILES SOUTHEAST OF BUFFALO. THIS THUNDERSTORM WILL LIKELY PRODUCE A TORNADO. DOPPLER RADAR INDICATED THE ASSOCIATED STORM MOVING SOUTHEAST AT 45 MPH. * THE TORNADO IS EXPECTED TO BE... 12 MILES NORTHEAST OF SUSSEX AROUND 250 PM MDT THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING PREVIOUSLY ISSUED FOR THE WARNED AREA. IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY STURDY BUILDING. AS A LAST RESORT...SEEK REFUGE IN A CULVERT...DITCH OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. BEWARE OF THE THREAT OF RISING WATER. 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 4418 10608 4383 10659 4351 10643 4356 10607 C. BAKER WCJIN-WYNE
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 2:06 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 24 min |
| Jul 4, 2:30 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 30 min |
| Jul 4, 2:44 PM MDT | Severe Thunderstorm Warning | RIW | Fremont, Hot Springs | 31 min |
| Jul 4, 3:15 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 30 min |
| Jul 4, 3:45 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 30 min |
| Jul 4, 4:30 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 30 min |
| Jul 4, 5:06 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 29 min |
Nearby
Tornado Warnings in Wyoming, 2001Every tornado warning in 2001Tornadoes 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.