149  
WWUS85 KRIW 180749  
RFWRIW  
 
URGENT - FIRE WEATHER MESSAGE  
NATIONAL WEATHER SERVICE RIVERTON WY  
149 AM MDT TUE SEP 18 2018  
 
WYZ280-285-300-182200-  
/O.UPG.KRIW.FW.A.0010.180918T1800Z-180919T0200Z/  
/O.EXB.KRIW.FW.W.0019.180918T1800Z-180919T0200Z/  
NATRONA COUNTY/CASPER BLM-SOUTH BIGHORN MOUNTAINS-CASPER MOUNTAIN-  
149 AM MDT TUE SEP 18 2018  
 
...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS  
EVENING...  
 
THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A RED FLAG  
WARNING, WHICH IS IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS  
EVENING. THE FIRE WEATHER WATCH IS NO LONGER IN EFFECT.  
 
* IMPACTS: LOW HUMIDITIES AND STRONG GUSTY WINDS WILL CREATE  
ERRATIC FIRE BEHAVIOR AND NEW FIRE STARTS.  
 
* AFFECTED AREA:  
IN CENTRAL WY...FIRE WEATHER ZONES 280...285 AND 300.  
 
* COUNTIES AFFECTED:  
IN CENTRAL WY...FREMONT...NATRONA.  
IN NORTH CENTRAL WY...HOT SPRINGS...JOHNSON...WASHAKIE.  
 
* WIND: SOUTHWEST 10 TO 20 MPH WITH GUSTS UP TO 30 MPH.  
 
* HUMIDITY: AS LOW AS 11 PERCENT.  
 
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 CAN  
CONTRIBUTE TO EXTREME FIRE BEHAVIOR.  
 

 
 

 
 
WYZ415-182200-  
/O.EXB.KRIW.FW.W.0019.000000T0000Z-180920T0200Z/  
NORTH ZONE BRIDGER TETON NF AND GRAND TETON NP-  
149 AM MDT TUE SEP 18 2018  
   
..RED FLAG WARNING IN EFFECT UNTIL 8 PM MDT WEDNESDAY
 
 
THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A RED FLAG  
WARNING, WHICH IS IN EFFECT UNTIL 8 PM MDT WEDNESDAY.  
 
* IMPACTS: LOW HUMIDITIES AND STRONG GUSTY WINDS WILL CREATE  
ERRATIC FIRE BEHAVIOR AND NEW FIRE STARTS.  
 
* DISCUSSION: THESE CRITICAL FIRE WEATHER CONDITIONS WILL CONTINUE  
THROUGH WEDNESDAY, WITH CRITICAL RH VALUES AND WEST-SOUTHWEST  
WINDS WITH GUSTS UP TO 25 MPH.  
 
* AFFECTED AREA:  
IN NORTHWEST WY...FIRE WEATHER ZONE 415.  
 
* COUNTIES AFFECTED:  
IN CENTRAL WY...FREMONT.  
IN NORTH CENTRAL WY...PARK...TETON.  
 
* WIND: SOUTH 10 TO 20 MPH WITH GUSTS UP TO 25 MPH.  
 
* HUMIDITY: AS LOW AS 12 PERCENT.  
 
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 CAN  
CONTRIBUTE TO EXTREME FIRE BEHAVIOR.  
 

 
 

 
 
WYZ283-182200-  
/O.UPG.KRIW.FW.A.0010.180918T1800Z-180919T0200Z/  
/O.EXA.KRIW.FW.W.0019.000000T0000Z-180919T0200Z/  
UPPER WIND RIVER BASIN/WIND RIVER BASIN-  
149 AM MDT TUE SEP 18 2018  
   
..RED FLAG WARNING IN EFFECT UNTIL 8 PM MDT THIS EVENING
 
 
THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A RED FLAG  
WARNING, WHICH IS IN EFFECT UNTIL 8 PM MDT THIS EVENING. THE FIRE  
WEATHER WATCH IS NO LONGER IN EFFECT.  
 
* IMPACTS: LOW HUMIDITIES AND STRONG GUSTY WINDS WILL CREATE  
ERRATIC FIRE BEHAVIOR AND NEW FIRE STARTS.  
 
* AFFECTED AREA:  
IN CENTRAL WY...FIRE WEATHER ZONE 283.  
 
* COUNTIES AFFECTED:  
IN CENTRAL WY...FREMONT.  
 
* WIND: SOUTHWEST 10 TO 20 MPH WITH GUSTS UP TO 30 MPH.  
 
* HUMIDITY: AS LOW AS 9 PERCENT.  
 
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 CAN  
CONTRIBUTE TO EXTREME FIRE BEHAVIOR.  
 

 
 

 
 
WYZ278-414-416-182200-  
/O.EXT.KRIW.FW.W.0019.000000T0000Z-180920T0200Z/  
UPPER GREEN RIVER BASIN/ROCK SPRINGS BLM-  
SALT AND WYOMING RANGES/WEST ZONE BRIDGER TETON NF-  
WEST WIND RIVER MOUNTAINS/EAST ZONE BRIDGER TETON NF-  
149 AM MDT TUE SEP 18 2018  
   
..RED FLAG WARNING NOW IN EFFECT UNTIL 8 PM MDT WEDNESDAY
 
 
* IMPACTS: LOW HUMIDITIES AND STRONG GUSTY WINDS WILL CREATE  
ERRATIC FIRE BEHAVIOR AND NEW FIRE STARTS.  
 
* DISCUSSION: THESE CRITICAL FIRE WEATHER CONDITIONS WILL CONTINUE  
THROUGH WEDNESDAY, WITH CRITICAL RH VALUES AND WEST- SOUTHWEST  
WINDS WITH GUSTS UP TO 30 MPH.  
 
* AFFECTED AREA:  
IN WEST CENTRAL WY...FIRE WEATHER ZONES 278...414 AND 416.  
 
* COUNTIES AFFECTED:  
IN CENTRAL WY...FREMONT.  
IN SOUTHWEST WY...SWEETWATER.  
IN WEST CENTRAL WY...LINCOLN...SUBLETTE.  
 
* WIND: SOUTHWEST 15 TO 20 MPH WITH GUSTS UP TO 35 MPH.  
 
* HUMIDITY: AS LOW AS 9 PERCENT.  
 
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 CAN  
CONTRIBUTE TO EXTREME FIRE BEHAVIOR.  
 

 
 

 
 
WYZ277-279-182200-  
/O.EXT.KRIW.FW.W.0019.000000T0000Z-180920T0200Z/  
LINCOLN AND UINTA COUNTIES/LOWER ELEVATIONS-  
SWEETWATER COUNTY/ROCK SPRINGS BLM/FLAMING GORGE NRA-  
149 AM MDT TUE SEP 18 2018  
   
..RED FLAG WARNING NOW IN EFFECT UNTIL 8 PM MDT WEDNESDAY
 
 
* IMPACTS: LOW HUMIDITIES AND STRONG GUSTY WINDS WILL CREATE  
ERRATIC FIRE BEHAVIOR AND NEW FIRE STARTS.  
 
* DISCUSSION: THESE CRITICAL FIRE WEATHER CONDITIONS WILL CONTINUE  
THROUGH WEDNESDAY, WITH CRITICAL RH VALUES AND WEST- SOUTHWEST  
WINDS WITH GUSTS UP TO 40 MPH.  
 
* AFFECTED AREA:  
IN SOUTHWEST WY...FIRE WEATHER ZONES 277 AND 279.  
 
* COUNTIES AFFECTED:  
IN SOUTHWEST WY...SWEETWATER...UINTA.  
IN WEST CENTRAL WY...LINCOLN.  
 
* WIND: SOUTHWEST 15 TO 25 MPH WITH GUSTS UP TO 40 MPH.  
 
* HUMIDITY: AS LOW AS 8 PERCENT.  
 
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 CAN  
CONTRIBUTE TO EXTREME FIRE BEHAVIOR.  
 

 
 

 
 
WYZ288-289-182200-  
/O.CON.KRIW.FW.W.0019.000000T0000Z-180919T0200Z/  
EAST WIND RIVER MOUNTAINS/SOUTH SHOSHONE NF-  
GRANITE/GREEN/FERRIS/RATTLESNAKE MOUNTAINS-  
149 AM MDT TUE SEP 18 2018  
 
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS  
EVENING...  
 
* IMPACTS: LOW HUMIDITIES AND STRONG GUSTY WINDS WILL CREATE  
ERRATIC FIRE BEHAVIOR AND NEW FIRE STARTS.  
 
* DISCUSSION: IT IS POSSIBLE THAT THESE CRITICAL FIRE WEATHER  
CONDITIONS WILL CONTINUE AROUND SOUTH PASS AND THE WESTERN PART  
OF 289 ON WEDNESDAY. A COLD FRONT WILL BE HANGING AROUND THE  
NORTHERN PART OF 289 ALONG THE DIVIDE, PROVIDING SOME HIGHER  
RELATIVE HUMIDITIES. MORE CRITICAL FIRE WEATHER CONDITIONS WILL  
LIKELY ARRIVE BY THURSDAY.  
 
* AFFECTED AREA:  
IN CENTRAL WY...FIRE WEATHER ZONES 288 AND 289.  
 
* COUNTIES AFFECTED:  
IN CENTRAL WY...FREMONT...NATRONA.  
IN SOUTHWEST WY...SWEETWATER.  
IN WEST CENTRAL WY...SUBLETTE.  
 
* WIND: SOUTHWEST 15 TO 25 MPH WITH GUSTS UP TO 35 MPH.  
 
* HUMIDITY: AS LOW AS 10 PERCENT.  
 
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 CAN  
CONTRIBUTE TO EXTREME FIRE BEHAVIOR.  
 

 
 

 
 
HTTP://WEATHER.GOV/RIVERTON  
 
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