Alert archive / Idaho / Red Flag Warnings in 2021
Red Flag Warning 26, NWS Pocatello, ID
NWS Pocatello, ID issued this red flag warning at Aug 31, 2021, 12:49 AM MDT for 12 counties in Idaho. It took effect at Aug 31, 2021, 12:00 PM MDT. It was in force for 9 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
- Aug 31, 2021, 12:49 AM MDT (06:49 UTC)
- In effect from
- Aug 31, 2021, 12:00 PM MDT
- Expired
- Aug 31, 2021, 9:00 PM MDT
- In force
- 9 hr
- Issued by
- NWS Pocatello, ID
Counties Bingham County, ID, Blaine County, ID, Boise County, ID, Bonneville County, ID, Butte County, ID, Clark County, ID, Custer County, ID, Fremont County, ID, Jefferson County, ID, Madison County, ID, Power County, ID, Teton County, ID
The radar
The Pocatello radar (KSFX), 68 km from the middle of the area, began a volume at 06:46 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
Boise Airport, ID (KBOI), launched 00:00Z, 6.8 hours before the alert went out and 278 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
- 3467 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
590 WWUS85 KPIH 310649 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 1249 AM MDT Tue Aug 31 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 410 AND 422... IDZ410-422-312100- /O.NEW.KPIH.FW.W.0026.210831T1800Z-210901T0300Z/ Upper Snake River Valley/Idaho Falls BLM- Sawtooth Range/Northern Sawtooth NF- 1249 AM MDT Tue Aug 31 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 410 AND 422... The National Weather Service in Pocatello has issued a Red Flag Warning for gusty winds and low relative humidity, which is in effect from noon today to 9 PM MDT this evening. * AFFECTED AREA...Fire Weather Zone 410 Upper Snake River Valley/Idaho Falls BLM and Fire Weather Zone 422 Sawtooth Range/Northern Sawtooth NF. * WINDS...Southwest 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...9 to 16 percent. * IMPACTS..The combination of wind and low humidity potentially will cause rapid fire spread with new or existing wildfires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A red flag warning means that critical fire weather conditions are either occurring now, or will shortly based on these criteria for Southeastern Idaho: - Relative humidity at or below 15 percent and wind gusts of at least 25 mph in the mountains, or 30 mph in the Snake Plain. - Thunderstorm coverage of 25 percent, without specific rainfall criteria. - Other high impact events deemed critical by the National Weather Service and area fire management agencies. && $$
2 follow-up statements
000 WWUS85 KPIH 312023 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 223 PM MDT Tue Aug 31 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 410 AND 422... IDZ410-422-010300- /O.CON.KPIH.FW.W.0026.000000T0000Z-210901T0300Z/ Upper Snake River Valley/Idaho Falls BLM- Sawtooth Range/Northern Sawtooth NF- 223 PM MDT Tue Aug 31 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 410 AND 422... * AFFECTED AREA...Fire Weather Zone 410 Upper Snake River Valley/Idaho Falls BLM and Fire Weather Zone 422 Sawtooth Range/Northern Sawtooth NF. * WINDS...Southwest 10 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 13 percent. * IMPACTS..The combination of wind and low humidity potentially will cause rapid fire spread with new or existing wildfires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A red flag warning means that critical fire weather conditions are either occurring now, or will shortly based on these criteria for Southeastern Idaho: - Relative humidity at or below 15 percent and wind gusts of at least 25 mph in the mountains, or 30 mph in the Snake Plain. - Thunderstorm coverage of 25 percent, without specific rainfall criteria. - Other high impact events deemed critical by the National Weather Service and area fire management agencies. && $$
544 WWUS85 KPIH 010307 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 907 PM MDT Tue Aug 31 2021 IDZ410-422-010415- /O.EXP.KPIH.FW.W.0026.000000T0000Z-210901T0300Z/ Upper Snake River Valley/Idaho Falls BLM- Sawtooth Range/Northern Sawtooth NF- 907 PM MDT Tue Aug 31 2021 ...RED FLAG WARNING HAS EXPIRED FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 410 AND 422... Winds across the warning area have dropped below critical thresholds. Relative humidity values remain below 15% across portions of the Arco Desert, but are slowly rising. Therefore, the warning has been allowed to expire for the day. $$ KSmith
Nearby
Red Flag Warnings in Idaho, 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.