Alert archive / Idaho / Red Flag Warnings in 2021
Red Flag Warning 18, NWS Pocatello, ID
NWS Pocatello, ID issued this red flag warning at Jul 19, 2021, 1:53 AM MDT for 25 counties in Idaho. It took effect at Jul 19, 2021, 12:00 PM MDT. It was in force for 33 hr. 9 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
- Jul 19, 2021, 1:53 AM MDT (07:53 UTC)
- In effect from
- Jul 19, 2021, 12:00 PM MDT
- Expired
- Jul 20, 2021, 9:03 PM MDT
- In force
- 33 hr
- Issued by
- NWS Pocatello, ID
All 25 counties
Bannock County, ID, Bear Lake County, ID, Bingham County, ID, Blaine County, ID, Boise County, ID, Bonneville County, ID, Butte County, ID, Caribou County, ID, Cassia County, ID, Clark County, ID, Custer County, ID, Franklin County, ID, Fremont County, ID, Idaho County, ID, Jefferson County, ID, Jerome County, ID, Lemhi County, ID, Lincoln County, ID, Madison County, ID, Minidoka County, ID, Oneida County, ID, Power County, ID, Teton County, ID, Twin Falls County, ID, Valley County, ID
The radar
The Pocatello radar (KSFX), 49 km from the middle of the area, began a volume at 07:56 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 |
|---|---|---|---|
| Jul 20, 8:43 AM MDT | HEAVY RAIN 0.47 | 5 Se Obsidian, ID | MESONET STATION HPFI1 - HORTON PEAK. LAST 24 HOURS. |
| Jul 20, 8:50 AM MDT | HEAVY RAIN 0.3 | 2 Wsw Custer, ID | MESONET STATION YFFI1 - BONANZA. LAST 24 HOURS. |
| Jul 20, 9:15 AM MDT | HEAVY RAIN 0.36 | 6 Sse Obsidian, ID | MESONET STATION 3019 - SMILEY CREEK AIRPORT. LAST 24 HOURS. |
| Jul 20, 2:15 PM MDT | TSTM WND GST 53 | 9 N Black Pine, ID | ITD RWIS STATION ITD47 - I-84 JUNIPER INTERCHANGE. |
| Jul 20, 4:14 PM MDT | HAIL 0.25 | 3 W Grace, ID | PEA-SIZED HAIL AND HEAVY RAIN (EST 0.60 IN IN 15 MIN). |
| Jul 20, 4:30 PM MDT | HAIL 0.5 | 4 W Soda Springs, ID | PUBLIC REPORTS HAIL ESTIMATED AT SLIGHTLY LARGER THAN PEAS AND VERY HEAVY RAIN WITH MINOR FLOODING ALONG US-30 BETWEEN ALEXANDER AND THE WESTERN SODA SPRINGS CITY LIMIT. TIME ESTIMATED BASED ON REPORT AND RADAR. |
| Jul 20, 4:42 PM MDT | HEAVY RAIN 0.5 | 1 Wsw Soda Springs, ID | HEAVY RAIN. APPROXIMATELY 0.50 IN 15 MIN. |
| Jul 20, 5:28 PM MDT | HAIL 0.5 | 2 Nnw Tetonia, ID | ESTIMATED HALF-INCH HAIL COVERING THE ROAD. BETWEEN TETONIA AND FELT. TIME ESTIMATED BASED ON RADAR. |
| Jul 20, 5:49 PM MDT | HEAVY RAIN 0.75 | 3 Ne Tetonia, ID | HEAVY RAIN. ESTIMATING 0.75 IN IN 45 MIN. |
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 00:00Z, 7.9 hours before the alert went out and 250 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
- 4147 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
092 WWUS85 KPIH 190753 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 153 AM MDT Mon Jul 19 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 11 PM MDT TUESDAY FOR THUNDERSTORMS FOR FIRE WEATHER ZONES 410, 411, 413, 422, 425, 427, 475 AND 476... IDZ413-427-192100- /O.UPG.KPIH.FW.A.0007.210719T1800Z-210720T0600Z/ /O.NEW.KPIH.FW.W.0018.210719T1800Z-210721T0500Z/ Caribou Range/Caribou NF- Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River- 153 AM MDT Mon Jul 19 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 11 PM MDT TUESDAY FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 413 AND 427... The National Weather Service in Pocatello has issued a Red Flag Warning for scattered thunderstorms, which is in effect from noon today to 11 PM MDT Tuesday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zone 413 Caribou Range/Caribou NF and Fire Weather Zone 427 Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River. * IMPACTS...Lightning and or strong outflow winds could create critical fire conditions. * THUNDERSTORMS...Today, a mix of wet and dry scattered thunderstorms with some rainfall over one tenth of an inch possible. Isolated thunderstorms are expected overnight and Tuesday morning, before becoming scattered in the afternoon with increasing potential of heavier rainfall tomorrow. * OUTFLOW WINDS...Winds 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. && $$ IDZ411-192100- /O.NEW.KPIH.FW.W.0018.210719T1800Z-210721T0500Z/ Centennial Mountains and Snake River Range/Targhee NF- 153 AM MDT Mon Jul 19 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 11 PM MDT TUESDAY FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONE 411... The National Weather Service in Pocatello has issued a Red Flag Warning for scattered thunderstorms, which is in effect from noon today to 11 PM MDT Tuesday. * AFFECTED AREA...Fire Weather Zone 411 Centennial Mountains and Snake River Range/Targhee NF. * IMPACTS...Lightning and or strong outflow winds could create critical fire conditions. * THUNDERSTORMS...Today, a mix of wet and dry scattered thunderstorms with some rainfall over one tenth of an inch possible. Isolated thunderstorms are expected overnight and Tuesday morning, before becoming scattered in the afternoon with increasing potential of heavier rainfall tomorrow. * OUTFLOW WINDS...Winds over 35 mph. PRECAUTIONARY/PREPAREDNESS ACTIONS... A red flag warning means that critical fire weather conditions are either occurring now, or will shortly based on these criteria for Southeastern Idaho: - Relative humidity at or below 15 percent and wind gusts of at least 25 mph in the mountains, or 30 mph in the Snake Plain. - Thunderstorm coverage of 25 percent, without specific rainfall criteria. - Other high impact events deemed critical by the National Weather Service and area fire management agencies. && $$ IDZ410-422-425-475-476-192100- /O.NEW.KPIH.FW.W.0018.210719T1800Z-210721T0500Z/ Upper Snake River Valley/Idaho Falls BLM- Sawtooth Range/Northern Sawtooth NF- Middle Snake River Valley/Twin Falls BLM north of the Snake River- East Salmon River Mountains/Salmon NF- Lemhi and Lost River Range/Challis NF- 153 AM MDT Mon Jul 19 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 11 PM MDT TUESDAY FOR ISOLATED TO SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 410, 422, 425, 475 AND 476... The National Weather Service in Pocatello has issued a Red Flag Warning for isolated to scattered thunderstorms, which is in effect from noon today to 11 PM MDT Tuesday. * AFFECTED AREA...Fire Weather Zone 410 Upper Snake River Valley/Idaho Falls BLM, 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, 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...Today, a mix of wet and dry isolated thunderstorms with some rainfall over one tenth of an inch possible. Isolated thunderstorms are expected overnight and Tuesday morning, before becoming scattered in the afternoon with increasing potential of heavier rainfall tomorrow. * OUTFLOW WINDS...Winds 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. && $$
3 follow-up statements
048 WWUS85 KPIH 192029 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 229 PM MDT Mon Jul 19 2021 ...RED FLAG WARNING IN EFFECT THROUGH 11 PM MDT TUESDAY FOR THUNDERSTORMS FOR FIRE WEATHER ZONES 410, 411, 413, 422, 425, 427, 475 AND 476... IDZ411-413-427-201200- /O.CON.KPIH.FW.W.0018.000000T0000Z-210721T0500Z/ Centennial Mountains and Snake River Range/Targhee NF- Caribou Range/Caribou NF- Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River- 229 PM MDT Mon Jul 19 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM MDT TUESDAY FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONE 411... * AFFECTED AREA...Fire Weather Zone 411 Centennial Mountains and Snake River Range/Targhee NF, Fire Weather Zone 413 Caribou Range/Caribou NF and Fire Weather Zone 427 Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River. * IMPACTS...Lightning and or strong outflow winds could create critical fire conditions. * THUNDERSTORMS...This evening, a mix of wet and dry scattered thunderstorms with some rainfall over one tenth of an inch possible. Isolated thunderstorms are expected overnight and Tuesday morning, before becoming scattered in the afternoon with increasing potential of heavier rainfall tomorrow. * OUTFLOW WINDS...Winds over 35 mph. PRECAUTIONARY/PREPAREDNESS ACTIONS... A red flag warning means that critical fire weather conditions are either occurring now, or will shortly based on these criteria for Southeastern Idaho: - Relative humidity at or below 15 percent and wind gusts of at least 25 mph in the mountains, or 30 mph in the Snake Plain. - Thunderstorm coverage of 25 percent, without specific rainfall criteria. - Other high impact events deemed critical by the National Weather Service and area fire management agencies. && $$ IDZ410-422-425-475-476-201200- /O.CON.KPIH.FW.W.0018.000000T0000Z-210721T0500Z/ Upper Snake River Valley/Idaho Falls BLM- Sawtooth Range/Northern Sawtooth NF- Middle Snake River Valley/Twin Falls BLM north of the Snake River- East Salmon River Mountains/Salmon NF- Lemhi and Lost River Range/Challis NF- 229 PM MDT Mon Jul 19 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM MDT TUESDAY FOR ISOLATED TO SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 410, 422, 425, 475 AND 476... * AFFECTED AREA...Fire Weather Zone 410 Upper Snake River Valley/Idaho Falls BLM, 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, 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...A mix of wet and dry isolated thunderstorms with some rainfall over one tenth of an inch possible. Isolated thunderstorms are expected overnight and Tuesday morning, before becoming scattered in the afternoon with increasing potential of heavier rainfall tomorrow. * OUTFLOW WINDS...Winds 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. && $$
683 WWUS85 KPIH 200706 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 106 AM MDT Tue Jul 20 2021 ...RED FLAG WARNING IN EFFECT THROUGH 11 PM MDT THIS EVENING FOR THUNDERSTORMS FOR FIRE WEATHER ZONES 410, 411, 413, 422, 425, 427, 475 AND 476... IDZ411-413-427-210500- /O.CON.KPIH.FW.W.0018.000000T0000Z-210721T0500Z/ Centennial Mountains and Snake River Range/Targhee NF- Caribou Range/Caribou NF- Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River- 106 AM MDT Tue Jul 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM MDT THIS EVENING FOR ISOLATED TO SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONE 411, 413 AND 427... * AFFECTED AREA...Fire Weather Zone 411 Centennial Mountains and Snake River Range/Targhee NF, Fire Weather Zone 413 Caribou Range/Caribou NF and Fire Weather Zone 427 Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River. * IMPACTS...Lightning and or strong outflow winds could create critical fire conditions. * THUNDERSTORMS...Isolated thunderstorms are expected this morning, before becoming scattered this afternoon. Wetting rains are expected with most storms, along with the potential of localized flooding or debris flows. * OUTFLOW WINDS...Winds over 35 mph. PRECAUTIONARY/PREPAREDNESS ACTIONS... A red flag warning means that critical fire weather conditions are either occurring now, or will shortly based on these criteria for Southeastern Idaho: - Relative humidity at or below 15 percent and wind gusts of at least 25 mph in the mountains, or 30 mph in the Snake Plain. - Thunderstorm coverage of 25 percent, without specific rainfall criteria. - Other high impact events deemed critical by the National Weather Service and area fire management agencies. && $$ IDZ410-422-425-475-476-210500- /O.CON.KPIH.FW.W.0018.000000T0000Z-210721T0500Z/ Upper Snake River Valley/Idaho Falls BLM- Sawtooth Range/Northern Sawtooth NF- Middle Snake River Valley/Twin Falls BLM north of the Snake River- East Salmon River Mountains/Salmon NF- Lemhi and Lost River Range/Challis NF- 106 AM MDT Tue Jul 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM MDT THIS EVENING FOR ISOLATED TO SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 410, 422, 425, 475 AND 476... * AFFECTED AREA...Fire Weather Zone 410 Upper Snake River Valley/Idaho Falls BLM, 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, 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...Isolated thunderstorms are expected this morning, before becoming scattered this afternoon. Most storms will produce wetting rains, along with the potential for localized flooding or debris flows. Localized amounts over 0.50 inches are possible in the central mountains. * OUTFLOW WINDS...Winds 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. && $$
458 WWUS85 KPIH 210303 RFWPIH URGENT - FIRE WEATHER MESSAGE National Weather Service Pocatello ID 903 PM MDT Tue Jul 20 2021 IDZ410-411-413-422-425-427-475-476-210415- /O.CAN.KPIH.FW.W.0018.000000T0000Z-210721T0500Z/ Upper Snake River Valley/Idaho Falls BLM- Centennial Mountains and Snake River Range/Targhee NF- Caribou Range/Caribou NF-Sawtooth Range/Northern Sawtooth NF- Middle Snake River Valley/Twin Falls BLM north of the Snake River- Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River- East Salmon River Mountains/Salmon NF- Lemhi and Lost River Range/Challis NF- 903 PM MDT Tue Jul 20 2021 ...RED FLAG WARNING IS CANCELLED FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 410, 411, 413, 422, 425, 427, 475 AND 476... The National Weather Service in Pocatello has cancelled the Red Flag Warning. Thunderstorm coverage has decreased to isolated, so we have cancelled the Red Flag Warning. $$
The office that day
Everything else NWS Pocatello, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 4:42 PM MDT | Special Weather Statement | PIH | Bear Lake | 63 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.