Alert archive / Wyoming / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 21, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jun 14, 2009, 8:21 PM MDT for Johnson County, Wyoming. It was in force for 39 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 14, 2009, 8:21 PM MDT (02:21 UTC)
- Expired
- Jun 14, 2009, 9:00 PM MDT
- In force
- 39 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
County Johnson County, WY
The radar
The Riverton/Lander radar (KRIW), 223 km from the middle of the area, began a volume at 02:23 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 nearest sounding before it
Riverton, WY (KRIW), launched 00:00Z, 2.4 hours before the alert went out and 218 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
- 13 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 2454 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KRIW 150221 SVRRIW WYC019-150300- /O.NEW.KRIW.SV.W.0021.090615T0221Z-090615T0300Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE RIVERTON WY 821 PM MDT SUN JUN 14 2009 THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL JOHNSON COUNTY IN NORTH CENTRAL WYOMING... * UNTIL 900 PM MDT * AT 820 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR I90 EXIT 82...OR 29 MILES SOUTHEAST OF BUFFALO...AND MOVING NORTH AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... I90 EXIT 82 BY 830 PM... POWDER RIVER REST AREA AND I90 EXIT 88 BY 835 PM... I90 EXIT 91 BY 840 PM... THIS INCLUDES INTERSTATE 90 IN WYOMING BETWEEN MILE MARKERS 79 AND 94. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR DAMAGING WINDS...LARGE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. TAKE COVER IN A STURDY STRUCTURE UNTIL THE STORM PASSES. && REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4435 10635 4434 10603 4406 10606 4407 10634 TIME...MOT...LOC 0221Z 185DEG 12KT 4416 10620 $$ C. BAKER
2 follow-up statements
000 WWUS55 KRIW 150239 SVSRIW SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 839 PM MDT SUN JUN 14 2009 WYC019-150300- /O.CON.KRIW.SV.W.0021.000000T0000Z-090615T0300Z/ JOHNSON WY- 839 PM MDT SUN JUN 14 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM MDT FOR EAST CENTRAL JOHNSON COUNTY... AT 838 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR I90 EXIT 88...OR 28 MILES EAST OF BUFFALO...MOVING NORTH AT 15 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... RURAL EASTERN JOHNSON COUNTY AT 850 PM THIS INCLUDES INTERSTATE 90 IN WYOMING BETWEEN MILE MARKERS 79 AND 94. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR DAMAGING WINDS...LARGE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. TAKE COVER IN A STURDY STRUCTURE UNTIL THE STORM PASSES. && REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4414 10633 4435 10635 4434 10603 4410 10606 TIME...MOT...LOC 0239Z 195DEG 13KT 4423 10618 $$ C. BAKER
000 WWUS55 KRIW 150257 SVSRIW SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 857 PM MDT SUN JUN 14 2009 WYC019-150307- /O.EXP.KRIW.SV.W.0021.000000T0000Z-090615T0300Z/ JOHNSON WY- 857 PM MDT SUN JUN 14 2009 ...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL JOHNSON COUNTY WILL EXPIRE AT 900 PM MDT... THE STORM HAS DECREASED IN INTENSITY AND IS NO LONGER SEVERE. THEREFORE...THE WARNING WILL BE ALLOWED TO EXPIRE. THIS INCLUDES INTERSTATE 90 IN WYOMING BETWEEN MILE MARKERS 79 AND 94. REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4414 10633 4435 10635 4434 10603 4410 10606 TIME...MOT...LOC 0257Z 195DEG 13KT 4429 10616 $$ C. BAKER
Nearby
Severe Thunderstorm Warnings in Wyoming, 2009Every severe thunderstorm warning 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.