Alert archive / Wyoming / Red Flag Warnings in 2012
Red Flag Warning 8, NWS Riverton, WY
NWS Riverton, WY issued this red flag warning at May 21, 2012, 8:33 PM MDT for Natrona County, Wyoming. It took effect at May 22, 2012, 11:00 AM MDT. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 21, 2012, 8:33 PM MDT (02:33 UTC)
- In effect from
- May 22, 2012, 11:00 AM MDT
- Expired
- May 22, 2012, 7:00 PM MDT
- In force
- 8 hr
- Issued by
- NWS Riverton, WY
County Natrona County, WY
The radar
The Riverton/Lander radar (KRIW), 137 km from the middle of the area, began a volume at 02:35 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, 2.6 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
- 3931 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
126 WWUS85 KRIW 220233 RFWRIW URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE RIVERTON WY 833 PM MDT MON MAY 21 2012 ...LOW HUMIDITY AND STRONG WIND WILL BRING RED FLAG CONDITIONS TO NATRONA COUNTY... .DRY CONDITIONS AND STRONG WIND AHEAD OF AN APPROACHING COLD FRONT WILL BRING RED FLAG CONDITIONS TO THE LOWER ELEVATIONS OF NATRONA COUNTY DURING THE AFTERNOON HOURS TUESDAY. WYZ280-221045- /O.NEW.KRIW.FW.W.0008.120522T1700Z-120523T0200Z/ NATRONA COUNTY/CASPER BLM- 833 PM MDT MON MAY 21 2012 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 8 PM MDT TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 280... THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A RED FLAG WARNING FOR WIND AND LOW RELATIVE HUMIDITY...WHICH IS IN EFFECT FROM 11 AM TO 8 PM MDT TUESDAY. * AFFECTED AREA...FIRE WEATHER ZONE 280. * WINDS...SOUTHWEST TO WEST AT 25 TO 35 MPH WITH GUSTS UP TO 50 MPH. * RELATIVE HUMIDITY...13 TO 16 PERCENT. * IMPACTS...THE COMBINATION OF STRONG AND GUSTY WINDS AND LOW RELATIVE HUMIDITY AS WELL AS CRITICALLY DRY FUELS WILL RESULT IN ENHANCED FIRE BEHAVIOR DURING THE AFTERNOON TUESDAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. && BERC $$ HTTP://WEATHER.GOV/RIVERTON
2 follow-up statements
450 WWUS85 KRIW 220700 RFWRIW URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE RIVERTON WY 100 AM MDT TUE MAY 22 2012 ...LOW HUMIDITY AND STRONG WIND WILL BRING RED FLAG CONDITIONS TO NATRONA COUNTY... .DRY CONDITIONS AND STRONG WIND AHEAD OF AN APPROACHING COLD FRONT WILL BRING RED FLAG CONDITIONS TO THE LOWER ELEVATIONS OF NATRONA COUNTY DURING THE AFTERNOON HOURS TODAY. WYZ280-230200- /O.CON.KRIW.FW.W.0008.120522T1700Z-120523T0200Z/ NATRONA COUNTY/CASPER BLM- 100 AM MDT TUE MAY 22 2012 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 280... * AFFECTED AREA...FIRE WEATHER ZONE 280. * WINDS...SOUTHWEST TO WEST AT 25 TO 35 MPH WITH GUSTS UP TO 50 MPH. * RELATIVE HUMIDITY...13 TO 16 PERCENT. * IMPACTS...THE COMBINATION OF STRONG AND GUSTY WINDS AND LOW RELATIVE HUMIDITY AS WELL AS CRITICALLY DRY FUELS WILL RESULT IN ENHANCED FIRE BEHAVIOR DURING THE AFTERNOON TODAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. && BERC $$ HTTP://WEATHER.GOV/RIVERTON
443 WWUS85 KRIW 230100 RFWRIW URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE RIVERTON WY 700 PM MDT TUE MAY 22 2012 WYZ280-230200- /O.CAN.KRIW.FW.W.0008.000000T0000Z-120523T0200Z/ NATRONA COUNTY/CASPER BLM- 700 PM MDT TUE MAY 22 2012 ...RED FLAG WARNING IS CANCELLED FOR FIRE WEATHER ZONE 280... THE NATIONAL WEATHER SERVICE IN RIVERTON HAS CANCELLED THE RED FLAG WARNING. RELATIVE HUMIDITY HAS RISEN AND THE COLD FRONT HAS PASSED. THE WIND WILL CONTINUE TO DECREASE THIS EVENING WHILE TEMPERATURES COOL DOWN INTO THE 50S...REDUCING THE FIRE BEHAVIOR THREAT. $$ HTTP://WEATHER.GOV/RIVERTON
Nearby
Red Flag Warnings in Wyoming, 2012Every red flag warning in 2012
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.