Alert archive / Wyoming / Red Flag Warnings in 2012
Red Flag Warning 5, NWS Riverton, WY
NWS Riverton, WY issued this red flag warning at Mar 31, 2012, 2:18 AM MDT for 10 counties in Wyoming. It took effect at Mar 31, 2012, 12:00 PM 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
- Mar 31, 2012, 2:18 AM MDT (08:18 UTC)
- In effect from
- Mar 31, 2012, 12:00 PM MDT
- Expired
- Mar 31, 2012, 8:11 PM MDT
- In force
- 8 hr
- Issued by
- NWS Riverton, WY
Counties Big Horn County, WY, Fremont County, WY, Hot Springs County, WY, Johnson County, WY, Lincoln County, WY, Natrona County, WY, Park County, WY, Sweetwater County, WY, Uinta County, WY, Washakie County, WY
The radar
The Riverton/Lander radar (KRIW), 16 km from the middle of the area, began a volume at 08:23 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, 8.3 hours before the alert went out and 20 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
- 2796 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
173 WWUS85 KRIW 310818 RFWRIW URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE RIVERTON WY 218 AM MDT SAT MAR 31 2012 ...CRITICAL FIRE WEATHER CONDITIONS THIS AFTERNOON AND EARLY EVENING... .A DRY SOUTHWEST WIND WILL DEVELOP ACROSS MUCH OF CENTRAL AND SOUTHERN WYOMING EAST OF THE DIVIDE AS WELL AS THE BIG HORN BASIN AND SWEETWATER COUNTY THIS AFTERNOON. THE COMBINATION OF ABOVE NORMAL TEMPERATURES IN THE 70S...RELATIVE HUMIDITY UNDER 15 PERCENT AND GUSTY SOUTHWEST WINDS OVER 30 MPH WITH WIND GUSTS PAST 45 MPH WILL PRODUCE DANGEROUS FIRE BEHAVIOR THIS AFTERNOON AND EVENING. VERY DRY AND WINDY CONDITIONS WILL LINGER ACROSS EAST CENTRAL WYOMING OVERNIGHT INTO SUNDAY MORNING BEFORE A COLD FRONT PUSHES SOUTH ACROSS THE AREA IN THE LATE MORNING AND AFTERNOON. WYZ277-279-312100- /O.UPG.KRIW.FW.A.0004.120331T1800Z-120401T0200Z/ /O.NEW.KRIW.FW.W.0005.120331T1800Z-120401T0200Z/ LINCOLN AND UINTA COUNTIES/LOWER ELEVATIONS- SWEETWATER COUNTY/ROCK SPRINGS BLM/FLAMING GORGE NRA- 218 AM MDT SAT MAR 31 2012 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 277 AND 279... 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 8 PM MDT THIS EVENING. THE FIRE WEATHER WATCH IS NO LONGER IN EFFECT. * AFFECTED AREA...FIRE WEATHER ZONES 277 AND 279. * WINDS...SOUTHWEST 25 TO 35 MPH WITH GUSTS UP TO 50 MPH. * RELATIVE HUMIDITY...AS LOW AS 13 PERCENT. * IMPACTS...RESIDENTS OF THE EFFECTED AREAS ARE STRONGLY ENCOURAGED TO MONITOR THE POTENTIAL FOR DANGEROUS FIRE BEHAVIOR THIS AFTERNOON AND EARLY EVENING. 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. && $$ WYZ275-276-282-283-312100- /O.UPG.KRIW.FW.A.0004.120331T1800Z-120401T0200Z/ /O.NEW.KRIW.FW.W.0005.120331T1800Z-120401T0200Z/ NORTH BIG HORN BASIN/WORLAND BLM-CODY FOOTHILLS- SOUTH BIG HORN BASIN/WORLAND BLM- UPPER WIND RIVER BASIN/WIND RIVER BASIN- 218 AM MDT SAT MAR 31 2012 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 275...276...282 AND 283... THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A RED FLAG WARNING FOR WIND AND LOW RELATIVE HUMIDITY...WHICH IS IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS EVENING. THE FIRE WEATHER WATCH IS NO LONGER IN EFFECT. * AFFECTED AREA...FIRE WEATHER ZONES 275...276...282 AND 283. * WINDS...SOUTHWEST 15 TO 25 MPH WITH GUSTS UP TO 45 MPH. * RELATIVE HUMIDITY...AS LOW AS 13 PERCENT. * IMPACTS...RESIDENTS OF THE EFFECTED AREAS ARE STRONGLY ENCOURAGED TO MONITOR THE POTENTIAL FOR DANGEROUS FIRE BEHAVIOR THIS AFTERNOON AND EARLY EVENING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. && $$ WYZ280-281-285-300-312100- /O.UPG.KRIW.FW.A.0004.120331T1800Z-120401T0200Z/ /O.NEW.KRIW.FW.W.0005.120331T1800Z-120401T1800Z/ NATRONA COUNTY/CASPER BLM-JOHNSON COUNTY/CASPER BLM- SOUTH BIGHORN MOUNTAINS-CASPER MOUNTAIN- 218 AM MDT SAT MAR 31 2012 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO NOON MDT SUNDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 280... 281...285 AND 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 NOON MDT SUNDAY. THE FIRE WEATHER WATCH IS NO LONGER IN EFFECT. * AFFECTED AREA...FIRE WEATHER ZONES 280...281...285 AND 300. * WINDS...SOUTHWEST 20 TO 30 MPH WITH GUSTS UP TO 50 MPH. * RELATIVE HUMIDITY...AS LOW AS 13 PERCENT. * IMPACTS...RESIDENTS OF THE EFFECTED AREAS ARE STRONGLY ENCOURAGED TO MONITOR THE POTENTIAL FOR DANGEROUS FIRE BEHAVIOR TODAY THROUGH SUNDAY MORNING. 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. && $$ HTTP://WEATHER.GOV/RIVERTON
2 follow-up statements
668 WWUS85 KRIW 311947 RFWRIW URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE RIVERTON WY 147 PM MDT SAT MAR 31 2012 ...CRITICAL FIRE WEATHER CONDITIONS THIS AFTERNOON AND EARLY EVENING... .A DRY SOUTHWEST WIND WILL CONTINUE ACROSS MUCH OF CENTRAL AND SOUTHERN WYOMING EAST OF THE DIVIDE AS WELL AS THE BIG HORN BASIN AND SWEETWATER COUNTY THIS AFTERNOON. THE COMBINATION OF ABOVE NORMAL TEMPERATURES IN THE 70S...RELATIVE HUMIDITY UNDER 15 PERCENT AND GUSTY SOUTHWEST WINDS OVER 30 MPH WITH WIND GUSTS PAST 45 MPH WILL PRODUCE DANGEROUS FIRE BEHAVIOR THIS AFTERNOON AND EVENING. VERY DRY AND WINDY CONDITIONS WILL LINGER ACROSS EAST CENTRAL WYOMING OVERNIGHT INTO SUNDAY MORNING BEFORE A COLD FRONT PUSHES SOUTH ACROSS THE AREA IN THE LATE MORNING AND AFTERNOON. WYZ277-279-010200- /O.CON.KRIW.FW.W.0005.000000T0000Z-120401T0200Z/ LINCOLN AND UINTA COUNTIES/LOWER ELEVATIONS- SWEETWATER COUNTY/ROCK SPRINGS BLM/FLAMING GORGE NRA- 147 PM MDT SAT MAR 31 2012 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 277 AND 279... * AFFECTED AREA...FIRE WEATHER ZONES 277 AND 279. * WINDS...SOUTHWEST 25 TO 35 MPH WITH GUSTS UP TO 50 MPH. * RELATIVE HUMIDITY...AS LOW AS 13 PERCENT. * IMPACTS...RESIDENTS OF THE EFFECTED AREAS ARE STRONGLY ENCOURAGED TO MONITOR THE POTENTIAL FOR DANGEROUS FIRE BEHAVIOR THIS AFTERNOON AND EARLY EVENING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. && $$ WYZ275-276-282-283-010200- /O.CON.KRIW.FW.W.0005.000000T0000Z-120401T0200Z/ NORTH BIG HORN BASIN/WORLAND BLM-CODY FOOTHILLS- SOUTH BIG HORN BASIN/WORLAND BLM- UPPER WIND RIVER BASIN/WIND RIVER BASIN- 147 PM MDT SAT MAR 31 2012 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 275... 276...282 AND 283... * AFFECTED AREA...FIRE WEATHER ZONES 275...276...282 AND 283. * WINDS...SOUTHWEST 15 TO 25 MPH WITH GUSTS UP TO 45 MPH. * RELATIVE HUMIDITY...AS LOW AS 13 PERCENT. * IMPACTS...RESIDENTS OF THE EFFECTED AREAS ARE STRONGLY ENCOURAGED TO MONITOR THE POTENTIAL FOR DANGEROUS FIRE BEHAVIOR THIS AFTERNOON AND EARLY EVENING. 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. && $$ WYZ280-281-285-300-010200- /O.CON.KRIW.FW.W.0005.000000T0000Z-120401T1800Z/ NATRONA COUNTY/CASPER BLM-JOHNSON COUNTY/CASPER BLM- SOUTH BIGHORN MOUNTAINS-CASPER MOUNTAIN- 147 PM MDT SAT MAR 31 2012 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL NOON MDT SUNDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 280...281... 285 AND 300... * AFFECTED AREA...FIRE WEATHER ZONES 280...281...285 AND 300. * WINDS...SOUTHWEST 20 TO 30 MPH WITH GUSTS UP TO 50 MPH. * RELATIVE HUMIDITY...AS LOW AS 13 PERCENT. * IMPACTS...RESIDENTS OF THE EFFECTED AREAS ARE STRONGLY ENCOURAGED TO MONITOR THE POTENTIAL FOR DANGEROUS FIRE BEHAVIOR TODAY THROUGH SUNDAY MORNING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. && $$ HTTP://WEATHER.GOV/RIVERTON
973 WWUS85 KRIW 010211 RFWRIW URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE RIVERTON WY 811 PM MDT SAT MAR 31 2012 ...RED FLAG WARNING CONDITIONS NO LONGER EXPECTED TONIGHT OR SUNDAY... .RISING RELATIVE HUMIDITY VALUES ALONG WITH COOLER TEMPERATURES AND DECREASING WIND WILL IMPROVE CONDITIONS OVERNIGHT. SLIGHTLY COOLER TEMPERATURES WILL HELP TO KEEP THE RELATIVE HUMIDITY ABOVE 15 PERCENT ON SUNDAY. WYZ280-281-285-300-010315- /O.CAN.KRIW.FW.W.0005.000000T0000Z-120401T1800Z/ NATRONA COUNTY/CASPER BLM-JOHNSON COUNTY/CASPER BLM- SOUTH BIGHORN MOUNTAINS-CASPER MOUNTAIN- 811 PM MDT SAT MAR 31 2012 ...RED FLAG WARNING IS CANCELLED FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 280...281...285 AND 300... THE NATIONAL WEATHER SERVICE IN RIVERTON HAS CANCELLED THE RED FLAG WARNING. RELATIVE HUMIDITY IS ALREADY RECOVERING AS TEMPERATURES FALL THIS EVENING. WIND SPEEDS HAVE ALSO DECREASED. A COLD FRONT WILL APPROACH THE AREA BY SUNDAY AFTERNOON...BUT RED FLAG CONDITIONS ARE NO LONGER EXPECTED SUNDAY MORNING AHEAD OF THIS FRONT. THEREFORE...THE RED FLAG WARNING FOR TONIGHT AND SUNDAY MORNING HAS BEEN CANCELLED. $$ WYZ275>277-279-282-283-010315- /O.EXP.KRIW.FW.W.0005.000000T0000Z-120401T0200Z/ NORTH BIG HORN BASIN/WORLAND BLM-CODY FOOTHILLS- LINCOLN AND UINTA COUNTIES/LOWER ELEVATIONS- SWEETWATER COUNTY/ROCK SPRINGS BLM/FLAMING GORGE NRA- SOUTH BIG HORN BASIN/WORLAND BLM- UPPER WIND RIVER BASIN/WIND RIVER BASIN- 811 PM MDT SAT MAR 31 2012 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 275...276...277...279...282 AND 283... RELATIVE HUMIDITY IS ALREADY RECOVERING AS TEMPERATURES FALL THIS EVENING. WIND SPEEDS HAVE ALSO DECREASED. THEREFORE...THE RED FLAG WARNING HAS BEEN ALLOWED TO EXPIRE. $$ 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.