Alert archive / Wyoming / Tornado Warnings in 2009
Tornado Warning 2, NWS Riverton, WY
NWS Riverton, WY issued this tornado warning at Jun 13, 2009, 7:27 PM MDT for Natrona County, Wyoming. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 13, 2009, 7:27 PM MDT (01:27 UTC)
- Expired
- Jun 13, 2009, 8:00 PM MDT
- In force
- 33 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
County Natrona County, WY
The radar
The Riverton/Lander radar (KRIW), 187 km from the middle of the area, began a volume at 01:29 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 13, 1:56 PM MDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Riverton, WY (KRIW), launched 00:00Z, 1.5 hours before the alert went out and 181 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
- 210 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 1959 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 28 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS55 KRIW 140127 TORRIW WYC025-140200- /O.NEW.KRIW.TO.W.0002.090614T0127Z-090614T0200Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE RIVERTON WY 727 PM MDT SAT JUN 13 2009 THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A * TORNADO WARNING FOR... EAST CENTRAL NATRONA COUNTY IN CENTRAL WYOMING... * UNTIL 800 PM MDT * AT 726 PM MDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM WITH STRONG ROTATION 6 MILES NORTHEAST OF EVANSVILLE...OR 10 MILES NORTHEAST OF CASPER...MOVING EAST AT 15 MPH. * THE TORNADO WILL BE NEAR... RURAL EASTERN NATRONA COUNTY AT 740 PM PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS TORNADO WARNING REPLACES THE PREVIOUS WARNING THAT WAS IN EFFECT FOR EAST CENTRAL NATRONA COUNTY. IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. && REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4318 10609 4289 10609 4286 10626 4301 10636 TIME...MOT...LOC 0127Z 249DEG 13KT 4294 10620 $$ C. BAKER
2 follow-up statements
000 WWUS55 KRIW 140142 SVSRIW SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 742 PM MDT SAT JUN 13 2009 WYC025-140200- /O.CON.KRIW.TO.W.0002.000000T0000Z-090614T0200Z/ NATRONA WY- 742 PM MDT SAT JUN 13 2009 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM MDT FOR EAST CENTRAL NATRONA COUNTY... AT 741 PM MDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM WITH STRONG ROTATION. THIS TORNADO WAS LOCATED OVER EXTREME EAST CENTRAL NATRONA COUNTY...OR 14 MILES NORTHEAST OF CASPER...MOVING EAST AT 15 MPH. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. THIS IS A DANGEROUS STORM ACT QUICKLY. IF YOU ARE IN THE PATH OF THIS TORNADO MOVE TO THE LOWEST FLOOR OF A STURDY BUILDING. IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING QUARTER SIZE HAIL AND WINDS OF 60 MPH. && REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4294 10623 4305 10625 4313 10609 4291 10609 TIME...MOT...LOC 0142Z 249DEG 13KT 4298 10614 $$ C. BAKER
000 WWUS55 KRIW 140156 SVSRIW SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 756 PM MDT SAT JUN 13 2009 WYC025-140206- /O.EXP.KRIW.TO.W.0002.000000T0000Z-090614T0200Z/ NATRONA WY- 756 PM MDT SAT JUN 13 2009 ...THE TORNADO WARNING FOR EAST CENTRAL NATRONA COUNTY WILL EXPIRE AT 800 PM MDT... THE STORM HAS DECREASED IN INTENSITY AND IS NO LONGER SEVERE. THEREFORE...THE WARNING WILL BE ALLOWED TO EXPIRE. REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4294 10623 4305 10625 4313 10609 4291 10609 TIME...MOT...LOC 0156Z 249DEG 13KT 4300 10607 $$ C. BAKER
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 13, 6:04 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 41 min |
| Jun 13, 7:07 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 38 min |
| Jun 13, 7:18 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 42 min |
| Jun 13, 8:33 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 42 min |
| Jun 13, 9:11 PM MDT | Flash Flood Warning | RIW | Natrona | 2 hr |
| Jun 14, 2:15 PM MDT | Severe Thunderstorm Warning | RIW | Hot Springs | 45 min |
| Jun 14, 2:54 PM MDT | Severe Thunderstorm Warning | RIW | Hot Springs | 66 min |
| Jun 14, 2:57 PM MDT | Tornado Warning | RIW | Hot Springs | 47 min |
Nearby
Tornado Warnings in Wyoming, 2009Every tornado warning in 2009Tornadoes in 2009
Sources
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.