Alert archive / Wyoming / Red Flag Warnings in 2021
Red Flag Warning 26, NWS Riverton, WY
NWS Riverton, WY issued this red flag warning at Oct 3, 2021, 1:23 PM MDT for 7 counties in Wyoming. It took effect at Oct 4, 2021, 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
- Oct 3, 2021, 1:23 PM MDT (19:23 UTC)
- In effect from
- Oct 4, 2021, 12:00 PM MDT
- Expired
- Oct 4, 2021, 7:00 PM MDT
- In force
- 7 hr
- Issued by
- NWS Riverton, WY
Counties Fremont County, WY, Hot Springs County, WY, Johnson County, WY, Natrona County, WY, Park County, WY, Sweetwater County, WY, Washakie County, WY
The radar
The Riverton/Lander radar (KRIW), 49 km from the middle of the area, began a volume at 19:23 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 12:00Z, 7.4 hours before the alert went out and 45 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
- 3355 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
467
WWUS85 KRIW 031923
RFWRIW
URGENT - FIRE WEATHER MESSAGE
National Weather Service Riverton WY
123 PM MDT Sun Oct 3 2021
WYZ280-281-285-041200-
/O.UPG.KRIW.FW.A.0016.211004T1800Z-211005T0100Z/
/O.NEW.KRIW.FW.W.0026.211004T1800Z-211005T0100Z/
Natrona County/Casper BLM-Johnson County/Casper BLM-
South Bighorn Mountains-
123 PM MDT Sun Oct 3 2021
...RED FLAG WARNING IN EFFECT FROM NOON TO 7 PM MDT MONDAY...
The National Weather Service in Riverton has issued a Red Flag
Warning, which is in effect from noon to 7 PM MDT Monday. the Fire
Weather Watch is no longer in effect.
* IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and
Strong Gusty Winds will create erratic fire behavior and new
fire starts.
* AFFECTED AREA:
In Central WY Fire Zones...280...285.
In North Central WY Fire Zone....281.
* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In North Central WY...Hot Springs...Johnson...Washakie.
* WIND: Southwest 10 to 15 mph with gusts up to 25 mph.
* HUMIDITY: 10 to 15 percent.
* TEMPERATURES: Zone 285: Highs in the mid 70s.
Zone 280/281: Highs in the mid 70s to low 80s.
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.
&&
$$
http://weather.gov/riverton3 follow-up statements
842 WWUS85 KRIW 040849 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 249 AM MDT Mon Oct 4 2021 WYZ289-050100- /O.EXA.KRIW.FW.W.0026.211004T1800Z-211005T0100Z/ Granite/Green/Ferris/Rattlesnake Mountains- 249 AM MDT Mon Oct 4 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 7 PM MDT THIS EVENING... The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from noon today to 7 PM MDT this evening. * IMPACTS: Low Humidities and Strong Gusty Winds will create erratic fire behavior with any new fire starts. * AFFECTED AREA: In Central WY...Fire Weather Zone 289. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In Southwest WY...Sweetwater. * WIND: Southwest 10 to 20 mph with gusts up to 30 mph. * HUMIDITY: As low as 15 percent. * TEMPERATURES: Highs around 70. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ WYZ286-050100- /O.EXA.KRIW.FW.W.0026.211004T1800Z-211005T0100Z/ Absaroka Mountains/North Shoshone NF- 249 AM MDT Mon Oct 4 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 7 PM MDT THIS EVENING... The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from noon today to 7 PM MDT this evening. * IMPACTS: Low Humidities and Strong Gusty Winds will create erratic fire behavior with any new fire starts. * AFFECTED AREA: In Northwest WY...Fire Weather Zone 286. * COUNTIES AFFECTED: In Central WY...Fremont. In North Central WY...Hot Springs...Park. * WIND: Southwest 10 to 15 mph with gusts up to 25 mph. * HUMIDITY: As low as 13 percent. * TEMPERATURES: Highs in the lower 60s. 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. && $$ WYZ280-281-285-050100- /O.CON.KRIW.FW.W.0026.211004T1800Z-211005T0100Z/ Natrona County/Casper BLM-Johnson County/Casper BLM- South Bighorn Mountains- 249 AM MDT Mon Oct 4 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 7 PM MDT THIS EVENING... * IMPACTS: Low Humidities and Strong Gusty Winds will create erratic fire behavior with any new fire starts. * AFFECTED AREA: In Central WY Fire Zones...280...285. In North Central WY Fire Zone....281. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Hot Springs...Johnson...Washakie. * WIND: Southwest 10 to 20 mph with gusts up to 30 mph. * HUMIDITY: As low as 11 percent. * TEMPERATURES: Highs in the mid 70s. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ http://weather.gov/riverton
434
WWUS85 KRIW 041702
RFWRIW
URGENT - FIRE WEATHER MESSAGE
National Weather Service Riverton WY
1102 AM MDT Mon Oct 4 2021
WYZ280-281-285-289-050100-
/O.CON.KRIW.FW.W.0026.211004T1800Z-211005T0100Z/
Natrona County/Casper BLM-Johnson County/Casper BLM-
South Bighorn Mountains-Granite/Green/Ferris/Rattlesnake Mountains-
1102 AM MDT Mon Oct 4 2021
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM MDT THIS
EVENING...
* IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and
Strong Gusty Winds will create erratic fire behavior and new
fire starts.
* AFFECTED AREA:
In Central WY Fire Zones...280...285...289.
In North Central WY Fire Zone....281.
* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In North Central WY...Hot Springs...Johnson...Washakie.
In Southwest WY...Sweetwater.
* WIND: Southwest 10 to 15 mph with gusts up to 25 mph.
* HUMIDITY: 10 to 15 percent.
* TEMPERATURES: Zone 285: Highs in the mid 70s.
Zone 280/281/289: Highs in the mid 70s to low 80s.
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.
&&
$$
WYZ286-050100-
/O.CON.KRIW.FW.W.0026.211004T1800Z-211005T0100Z/
Absaroka Mountains/North Shoshone NF-
1102 AM MDT Mon Oct 4 2021
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM MDT THIS
EVENING...
* IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and
Strong Gusty Winds will create erratic fire behavior and new
fire starts.
* AFFECTED AREA:
In Northwest WY...Fire Weather Zone 286.
* COUNTIES AFFECTED:
In Central WY...Fremont.
In North Central WY...Hot Springs...Park.
* WIND: Southwest 10 to 15 mph with gusts up to 30 mph.
* HUMIDITY: 10 to 18 percent.
* TEMPERATURES: Highs in the mid 60s to lower 70s.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions are
either occurring now....or will shortly. A combination of strong
winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.
&&
$$
http://weather.gov/riverton951 WWUS85 KRIW 050053 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 653 PM MDT Mon Oct 4 2021 WYZ280-281-285-289-050200- /O.EXP.KRIW.FW.W.0026.000000T0000Z-211005T0100Z/ Natrona County/Casper BLM-Johnson County/Casper BLM- South Bighorn Mountains-Granite/Green/Ferris/Rattlesnake Mountains- 653 PM MDT Mon Oct 4 2021 ...RED FLAG WARNING WILL EXPIRE AT 7 PM MDT THIS EVENING... Wind speeds are on the decrease this evening and have dropped below warning thresholds. Therefore, the Red Flag Warning will be allowed to expire at 7 PM. $$ WYZ286-050200- /O.EXP.KRIW.FW.W.0026.000000T0000Z-211005T0100Z/ Absaroka Mountains/North Shoshone NF- 653 PM MDT Mon Oct 4 2021 ...RED FLAG WARNING WILL EXPIRE AT 7 PM MDT THIS EVENING... Wind speeds are on the decrease this evening and have generally fallen below warning thresholds. Therefore, the Red Flag Warning will be allowed to expire at 7 PM. $$ http://weather.gov/riverton
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 3, 2:17 AM MDT | Fire Weather Watch | RIW | Fremont, Hot Springs, Johnson, Natrona, Washakie | 11 hr |
Nearby
Red Flag Warnings in Wyoming, 2021Every red flag warning in 2021
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.