Alert archive / Wyoming / Red Flag Warnings in 2012
Red Flag Warning 7, NWS Riverton, WY
NWS Riverton, WY issued this red flag warning at Apr 7, 2012, 2:20 AM MDT for Natrona County, Wyoming. It took effect at Apr 7, 2012, 12:00 PM MDT. It was in force for 7 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
- Apr 7, 2012, 2:20 AM MDT (08:20 UTC)
- In effect from
- Apr 7, 2012, 12:00 PM MDT
- Expired
- Apr 7, 2012, 7:00 PM MDT
- In force
- 7 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 08:20 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, 8.3 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
- 3092 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
707 WWUS85 KRIW 070820 RFWRIW URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE RIVERTON WY 220 AM MDT SAT APR 7 2012 ...VERY LOW HUMIDITY AND BREEZY CONDITIONS EXPECTED ACROSS NATRONA COUNTY THIS AFTERNOON... .VERY DRY AIR WILL MOVE INTO NATRONA COUNTY THIS MORNING BEHIND A DEPARTING AREA OF LOW PRESSURE AND COLD FRONT. A COMBINATION OF VERY LOW RELATIVE HUMIDITY AND GUSTY WEST TO SOUTHWESTERLY BREEZES WILL RESULT IN CRITICAL FIRE WEATHER CONDITIONS. WYZ280-300-080100- /O.NEW.KRIW.FW.W.0007.120407T1800Z-120408T0100Z/ NATRONA COUNTY/CASPER BLM-CASPER MOUNTAIN- 220 AM MDT SAT APR 7 2012 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 7 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 280 AND THE LOWER ELEVATIONS OF ZONE 300... THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A RED FLAG WARNING FOR WIND AND LOW RELATIVE HUMIDITY...WHICH IS IN EFFECT FROM NOON TODAY TO 7 PM MDT THIS EVENING. * AFFECTED AREA...FIRE WEATHER ZONES 280 AND THE LOWER ELEVATIONS OF ZONE 300. * WINDS...WEST TO SOUTHWEST 15 TO 25 MPH WITH GUSTS UP TO 35 MPH. * RELATIVE HUMIDITY...10 TO 15 PERCENT. * IMPACTS...THE COMBINATION OF GUSTY WINDS AND LOW RELATIVE HUMIDITIES WILL RESULT IN CRITICAL FIRE WEATHER CONDITIONS DURING THE AFTERNOON UNTIL AROUND SUNSET. 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. && $$ HTTP://WEATHER.GOV/RIVERTON
1 follow-up statement
466 WWUS85 KRIW 080054 RFWRIW URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE RIVERTON WY 654 PM MDT SAT APR 7 2012 WYZ280-300-080200- /O.EXP.KRIW.FW.W.0007.000000T0000Z-120408T0100Z/ NATRONA COUNTY/CASPER BLM-CASPER MOUNTAIN- 654 PM MDT SAT APR 7 2012 ...RED FLAG WARNING WILL EXPIRE AT 7 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 280 AND 300... THE WIND WILL BE DECREASING AFTER 700 PM WITH RELATIVE HUMIDITY RISING AS THE EVENING COOLS DOWN. THEREFORE...THE RED FLAG WARNING WILL EXPIRE AT 700 PM MDT. $$ 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.