Alert archive / Idaho / Red Flag Warnings in 2021
Red Flag Warning 35, NWS Pocatello, ID
NWS Pocatello, ID issued this red flag warning at Sep 26, 2021, 2:14 PM MDT for Blaine County, Boise County, Custer County, Idaho. It took effect at Sep 27, 2021, 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
- Sep 26, 2021, 2:14 PM MDT (20:14 UTC)
- In effect from
- Sep 27, 2021, 12:00 PM MDT
- Expired
- Sep 27, 2021, 8:00 PM MDT
- In force
- 8 hr
- Issued by
- NWS Pocatello, ID
Counties Blaine County, ID, Boise County, ID, Custer County, ID
The radar
The Boise radar (KCBX), 134 km from the middle of the area, began a volume at 20:18 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 12:00Z, 8.2 hours before the alert went out and 128 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
- 3217 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
965 WWUS85 KPIH 262014 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 214 PM MDT Sun Sep 26 2021 IDZ422-271200- /O.CAN.KPIH.FW.W.0034.210928T1800Z-210929T0200Z/ /O.NEW.KPIH.FW.W.0035.210927T1800Z-210928T0200Z/ Sawtooth Range/Northern Sawtooth NF- 214 PM MDT Sun Sep 26 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TO 8 PM MDT MONDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 422... ...RED FLAG WARNING IS CANCELLED FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 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 to 8 PM MDT Monday. * AFFECTED AREA...Fire Weather Zone 422 Sawtooth Range/Northern Sawtooth NF. * WINDS...Southwest 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 11 percent. * IMPACTS...Fire spread rates and fire intensity can reach extreme levels with this kind of humidity and these winds. 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. && Messick $$
3 follow-up statements
593 WWUS85 KPIH 270016 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 616 PM MDT Sun Sep 26 2021 IDZ422-271200- /O.CON.KPIH.FW.W.0035.210927T1800Z-210928T0200Z/ Sawtooth Range/Northern Sawtooth NF- 616 PM MDT Sun Sep 26 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 8 PM MDT MONDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR IDAHO FIRE WEATHER ZONE 422... * AFFECTED AREA...Fire Weather Zone 422 Sawtooth Range/Northern Sawtooth NF. * WINDS...Southwest 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 11 percent. * IMPACTS...Fire spread rates and fire intensity can reach extreme levels with this kind of humidity and these winds. PRECAUTIONARY/PREPAREDNESS ACTIONS... A red flag warning means that critical fire weather conditions are either occurring now, or will shortly based on these criteria for Southeastern Idaho: - Relative humidity at or below 15 percent and wind gusts of at least 25 mph in the mountains, or 30 mph in the Snake Plain. && Messick/13 $$
900 WWUS85 KPIH 271114 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 514 AM MDT Mon Sep 27 2021 IDZ422-280200- /O.CON.KPIH.FW.W.0035.210927T1800Z-210928T0200Z/ Sawtooth Range/Northern Sawtooth NF- 514 AM MDT Mon Sep 27 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR IDAHO FIRE WEATHER ZONE 422... * AFFECTED AREA...Fire Weather Zone 422 Sawtooth Range/Northern Sawtooth NF. * WINDS...Southwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 11 percent. * IMPACTS...Fire spread rates and fire intensity can reach extreme levels with this kind of humidity and these winds. 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. && Messick/13 $$
388 WWUS85 KPIH 280154 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 754 PM MDT Mon Sep 27 2021 IDZ422-280300- /O.EXP.KPIH.FW.W.0035.000000T0000Z-210928T0200Z/ Sawtooth Range/Northern Sawtooth NF- 754 PM MDT Mon Sep 27 2021 ...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR IDAHO FIRE WEATHER ZONE 422... Wind gusts have fallen below warning criteria and thus the Red Flag Warning will be allowed to expire. $$
The office that day
Everything else NWS Pocatello, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 26, 1:23 PM MDT | Red Flag Warning | PIH | Blaine, Boise, Custer | 51 min |
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.