Alert archive / Idaho / Red Flag Warnings in 2021
Red Flag Warning 23, NWS Pocatello, ID
NWS Pocatello, ID issued this red flag warning at Aug 4, 2021, 1:55 PM MDT for 4 counties in Idaho. It took effect at Aug 5, 2021, 12:00 PM MDT. It was in force for 10 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 4, 2021, 1:55 PM MDT (19:55 UTC)
- In effect from
- Aug 5, 2021, 12:00 PM MDT
- Expired
- Aug 5, 2021, 10:00 PM MDT
- In force
- 10 hr
- Issued by
- NWS Pocatello, ID
Counties Custer County, ID, Idaho County, ID, Lemhi County, ID, Valley County, ID
The radar
The Boise radar (KCBX), 198 km from the middle of the area, began a volume at 19:55 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, 7.9 hours before the alert went out and 189 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
- 28 J/kg
- Mixed-layer CIN
- -486 J/kg
- Mixed-layer LCL
- 2886 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
389 WWUS85 KPIH 041955 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 155 PM MDT Wed Aug 4 2021 IDZ475-051100- /O.NEW.KPIH.FW.W.0023.210805T1800Z-210806T0400Z/ East Salmon River Mountains/Salmon NF- 155 PM MDT Wed Aug 4 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TO 10 PM MDT THURSDAY FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONE 475... The National Weather Service in Pocatello has issued a Red Flag Warning for scattered thunderstorms, which is in effect from noon to 10 PM MDT Thursday. * AFFECTED AREA...Fire Weather Zone 475 East Salmon River Mountains/Salmon NF. * IMPACTS...Scattered thunderstorms may produce new fire starts. Also, gusty and erratic winds will likely cause existing fires to spread. Initial thunderstorms in the afternoon will start more dry but by the evening will transition into more wet thunderstorms. Moderate to heavy rain is possible Thursday evening into Friday morning. Localized flooding will be possible. * OUTFLOW WINDS...Wind gusts of 40 to 50 mph are possible near thunderstorms. 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: - Thunderstorm coverage of 25 percent, without specific rainfall criteria. && $$
3 follow-up statements
630 WWUS85 KPIH 050853 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 253 AM MDT Thu Aug 5 2021 IDZ475-060400- /O.CON.KPIH.FW.W.0023.210805T1800Z-210806T0400Z/ East Salmon River Mountains/Salmon NF- 253 AM MDT Thu Aug 5 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 10 PM MDT THIS EVENING FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONE 475... * AFFECTED AREA...Fire Weather Zone 475 East Salmon River Mountains/Salmon NF. * IMPACTS...Scattered thunderstorms may produce new fire starts. Also, gusty and erratic winds will likely cause existing fires to spread. Initial thunderstorms in the afternoon will start more dry but by the evening will transition into more wet thunderstorms. Moderate to heavy rain is possible Thursday evening into Friday morning. Localized flooding will be possible. * OUTFLOW WINDS...Wind gusts of 40 to 50 mph are possible near thunderstorms. PRECAUTIONARY/PREPAREDNESS ACTIONS... A red flag warning means that critical fire weather conditions are either occurring now, or will shortly based on these criteria for Southeastern Idaho: - Thunderstorm coverage of 25 percent, without specific rainfall criteria. && $$
127 WWUS85 KPIH 051858 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 1258 PM MDT Thu Aug 5 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM MDT THIS EVENING FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONE 475... IDZ475-060400- /O.CON.KPIH.FW.W.0023.000000T0000Z-210806T0400Z/ East Salmon River Mountains/Salmon NF- 1258 PM MDT Thu Aug 5 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM MDT THIS EVENING FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONE 475... * AFFECTED AREA...Fire Weather Zone 475 East Salmon River Mountains/Salmon NF. * IMPACTS...Scattered thunderstorms may produce new fire starts. Also, gusty and erratic winds will likely cause existing fires to spread. Initial thunderstorms in the afternoon will start more dry but by the evening will transition into more wet thunderstorms. Moderate to heavy rain is possible later Thursday evening into Friday morning. Localized flooding will be possible. * OUTFLOW WINDS...Wind gusts of 40 to 50 mph are possible near thunderstorms. 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: - Thunderstorm coverage of 25 percent, without specific rainfall criteria. && $$
667 WWUS85 KPIH 060400 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 1000 PM MDT Thu Aug 5 2021 IDZ475-060500- /O.EXP.KPIH.FW.W.0023.000000T0000Z-210806T0400Z/ East Salmon River Mountains/Salmon NF- 1000 PM MDT Thu Aug 5 2021 ...RED FLAG WARNING WILL EXPIRE AT 10 PM MDT THIS EVENING FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONE 475... Thunderstorms are moving to more isolated in coverage for the remainder of the night and into tomorrow. Also, relative humidities are expected to rise significantly. Additional showers and thunderstorms that will move in with the cold front late tonight into tomorrow morning will be more wet in nature. Some moderate to heavy showers will need to be monitored for flooding potential. Also, daytime temperatures on Friday with the cold front will be 10 to 15 degrees cooler than Thursday. $$
The office that day
Everything else NWS Pocatello, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 6:18 PM MDT | Areal Flood Advisory | PIH | Blaine, Butte, Custer | 117 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.