Alert archive / Idaho / Red Flag Warnings in 2021
Red Flag Warning 24, NWS Pocatello, ID
NWS Pocatello, ID issued this red flag warning at Aug 20, 2021, 9:50 AM MDT for 10 counties in Idaho. It took effect at Aug 21, 2021, 12:00 PM MDT. It was in force for 11 hr. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 20, 2021, 9:50 AM MDT (15:50 UTC)
- In effect from
- Aug 21, 2021, 12:00 PM MDT
- Expired
- Aug 21, 2021, 11:00 PM MDT
- In force
- 11 hr
- Issued by
- NWS Pocatello, ID
Counties Blaine County, ID, Boise County, ID, Butte County, ID, Cassia County, ID, Custer County, ID, Jerome County, ID, Lincoln County, ID, Minidoka County, ID, Power County, ID, Twin Falls County, ID
The radar
The Pocatello radar (KSFX), 109 km from the middle of the area, began a volume at 15:49 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 21, 3:44 PM MDT | TSTM WND GST 44 | 6 S Sun Valley, ID | MESONET STATION OHOI1 6 S SUN VALLEY OHIO GULCH. |
| Aug 21, 5:15 PM MDT | TSTM WND GST 45 | 8 Nnw Dickey, ID | OUTFLOW WINDS MEASURED AT WILLOW SUMMIT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Boise Airport, ID (KBOI), launched 12:00Z, 3.8 hours before the alert went out and 182 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
- 1908 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
311 WWUS85 KPIH 201550 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 950 AM MDT Fri Aug 20 2021 ...RED FLAG WARNING IN EFFECT FROM NOON SATURDAY TO MIDNIGHT MDT SATURDAY NIGHT FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 422, 425 AND 427... IDZ422-425-427-211200- /O.NEW.KPIH.FW.W.0024.210821T1800Z-210822T0600Z/ Sawtooth Range/Northern Sawtooth NF- Middle Snake River Valley/Twin Falls BLM north of the Snake River- Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River- 950 AM MDT Fri Aug 20 2021 ...RED FLAG WARNING IN EFFECT FROM NOON SATURDAY TO MIDNIGHT MDT SATURDAY NIGHT FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 422, 425 AND 427... The National Weather Service in Pocatello has issued a Red Flag Warning for scattered thunderstorms, which is in effect from noon Saturday to midnight MDT Saturday night. * AFFECTED AREA...Fire Weather Zone 422 Sawtooth Range/Northern Sawtooth NF, Fire Weather Zone 425 Middle Snake River Valley/Twin Falls BLM north of the Snake River and Fire Weather Zone 427 Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River. * IMPACTS...Scattered thunderstorms with gusty outflow winds may produce new starts or help spread existing fires. Most storms WILL NOT produce wetting rains. * OUTFLOW WINDS...Gusts over 35 mph. 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. && $$
3 follow-up statements
133 WWUS85 KPIH 210743 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 143 AM MDT Sat Aug 21 2021 IDZ422-425-427-212045- /O.EXT.KPIH.FW.W.0024.210821T1800Z-210822T0500Z/ Sawtooth Range/Northern Sawtooth NF- Middle Snake River Valley/Twin Falls BLM north of the Snake River- Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River- 143 AM MDT Sat Aug 21 2021 ...RED FLAG WARNING NOW IN EFFECT FROM NOON TODAY TO 11 PM MDT THIS EVENING FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 422, 425 AND 427... * AFFECTED AREA...Fire Weather Zone 422 Sawtooth Range/Northern Sawtooth NF, Fire Weather Zone 425 Middle Snake River Valley/Twin Falls BLM north of the Snake River and Fire Weather Zone 427 Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River. * IMPACTS...Scattered thunderstorms with gusty outflow winds may produce new fire starts or help spread existing fires. Most storms WILL NOT produce wetting rains. * OUTFLOW WINDS...Gusts up to 40 mph possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A red flag warning means that critical fire weather conditions are expected based on these criteria for Southeastern Idaho: - Thunderstorm coverage of 25 percent, without specific rainfall criteria. && $$
257 WWUS85 KPIH 211954 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 154 PM MDT Sat Aug 21 2021 IDZ422-425-427-220400- /O.CON.KPIH.FW.W.0024.000000T0000Z-210822T0500Z/ Sawtooth Range/Northern Sawtooth NF- Middle Snake River Valley/Twin Falls BLM north of the Snake River- Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River- 154 PM MDT Sat Aug 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM MDT THIS EVENING FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 422, 425 AND 427... * AFFECTED AREA...Fire Weather Zone 422 Sawtooth Range/Northern Sawtooth NF, Fire Weather Zone 425 Middle Snake River Valley/Twin Falls BLM north of the Snake River and Fire Weather Zone 427 Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River. * IMPACTS...Scattered thunderstorms with gusty outflow winds may produce new fire starts or help spread existing fires. Most storms WILL NOT produce wetting rains. * OUTFLOW WINDS...Gusts up to 50 mph possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A red flag warning means that critical fire weather conditions are expected based on these criteria for Southeastern Idaho: - Thunderstorm coverage of 25 percent, without specific rainfall criteria. && Messick $$
130 WWUS85 KPIH 220438 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 1038 PM MDT Sat Aug 21 2021 IDZ422-425-427-220545- /O.EXP.KPIH.FW.W.0024.000000T0000Z-210822T0500Z/ Sawtooth Range/Northern Sawtooth NF- Middle Snake River Valley/Twin Falls BLM north of the Snake River- Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River- 1038 PM MDT Sat Aug 21 2021 ...RED FLAG WARNING WILL EXPIRE AT 11 PM MDT THIS EVENING FOR FIRE WEATHER ZONES 422, 425 AND 427... A few isolated thunderstorms remain in place across these areas but activity will diminish over the next hour or so. $$
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.