Alert archive / Idaho / Red Flag Warnings in 2021
Red Flag Warning 19, NWS Pocatello, ID
NWS Pocatello, ID issued this red flag warning at Jul 21, 2021, 1:15 AM MDT for 5 counties in Idaho. It took effect at Jul 21, 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
- Jul 21, 2021, 1:15 AM MDT (07:15 UTC)
- In effect from
- Jul 21, 2021, 12:00 PM MDT
- Expired
- Jul 21, 2021, 9:00 PM MDT
- In force
- 9 hr
- Issued by
- NWS Pocatello, ID
Counties Butte County, ID, Custer County, ID, Idaho County, ID, Lemhi County, ID, Valley County, ID
The radar
The Boise radar (KCBX), 194 km from the middle of the area, began a volume at 07:19 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, 7.3 hours before the alert went out and 186 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
- 2 J/kg
- Mixed-layer CIN
- -225 J/kg
- Mixed-layer LCL
- 2727 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- -1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
737 WWUS85 KPIH 210715 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 115 AM MDT Wed Jul 21 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 475 AND 476... IDZ475-476-212100- /O.NEW.KPIH.FW.W.0019.210721T1800Z-210722T0300Z/ East Salmon River Mountains/Salmon NF- Lemhi and Lost River Range/Challis NF- 115 AM MDT Wed Jul 21 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 475 AND 476... The National Weather Service in Pocatello has issued a Red Flag Warning for scattered thunderstorms, which is in effect from noon today to 9 PM MDT this evening. * AFFECTED AREA...Fire Weather Zone 475 East Salmon River Mountains/Salmon NF and Fire Weather Zone 476 Lemhi and Lost River Range/Challis NF. * IMPACTS...Lightning and or strong outflow winds could create critical fire conditions. * THUNDERSTORMS...Scattered thunderstorms will develop in the afternoon. Wetting rains are possible with some of the stronger storms, including localized rainfall amounts over 0.25 inches. * OUTFLOW WINDS...Winds over 35 mph are possible. 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. && $$
2 follow-up statements
149 WWUS85 KPIH 212025 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 225 PM MDT Wed Jul 21 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 475 AND 476... IDZ475-476-220300- /O.CON.KPIH.FW.W.0019.000000T0000Z-210722T0300Z/ East Salmon River Mountains/Salmon NF- Lemhi and Lost River Range/Challis NF- 225 PM MDT Wed Jul 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 475 AND 476... * AFFECTED AREA...Fire Weather Zone 475 East Salmon River Mountains/Salmon NF and Fire Weather Zone 476 Lemhi and Lost River Range/Challis NF. * IMPACTS...Lightning and or strong outflow winds could create critical fire conditions. * THUNDERSTORMS...Scattered thunderstorms will continue through the evening. Wetting rains are possible with some of the stronger storms, including localized rainfall amounts over 0.25 inches. * OUTFLOW WINDS...Winds over 35 mph are possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A red flag warning means that critical fire weather conditions are either occurring now, or will shortly based on these criteria for Southeastern Idaho: - Relative humidity at or below 15 percent and wind gusts of at least 25 mph in the mountains, or 30 mph in the Snake Plain. - Thunderstorm coverage of 25 percent, without specific rainfall criteria. - Other high impact events deemed critical by the National Weather Service and area fire management agencies. && $$
619 WWUS85 KPIH 220250 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 850 PM MDT Wed Jul 21 2021 IDZ475-476-220400- /O.EXP.KPIH.FW.W.0019.000000T0000Z-210722T0300Z/ East Salmon River Mountains/Salmon NF- Lemhi and Lost River Range/Challis NF- 850 PM MDT Wed Jul 21 2021 ...RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 475 AND 476... Thunderstorm coverage has decreased to isolated this evening, so the warning will be allowed to expire. Isolated storms may continue through midnight. $$
The office that day
Everything else NWS Pocatello, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 3:23 PM MDT | Special Weather Statement | PIH | Custer | 52 min |
| Jul 21, 3:40 PM MDT | Special Weather Statement | PIH | Bingham | 50 min |
| Jul 21, 3:43 PM MDT | Special Weather Statement | PIH | Cassia | 47 min |
| Jul 21, 4:20 PM MDT | Special Weather Statement | PIH | Minidoka | 40 min |
| Jul 21, 4:36 PM MDT | Special Weather Statement | PIH | Power | 39 min |
| Jul 21, 4:59 PM MDT | Special Weather Statement | PIH | Cassia | 46 min |
| Jul 21, 5:04 PM MDT | Special Weather Statement | PIH | Power | 41 min |
| Jul 21, 5:14 PM MDT | Special Weather Statement | PIH | Camas | 46 min |
| Jul 21, 5:19 PM MDT | Special Weather Statement | PIH | Power | 56 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.