Red Flag Warning for Upper Snake River Valley/Idaho Falls BLM; Sawtooth Range/Northern Sawtooth NF; Middle Snake River Valley/Twin Falls BLM north of the Snake River +2 more
Official alert fields
What you need to know
- Applies to
- East Salmon River Mountains/Salmon NF, Lemhi and Lost River Range/Challis NF, Middle Snake River Valley/Twin Falls BLM north of the Snake River, Sawtooth Range/Northern Sawtooth NF, Upper Snake River Valley/Idaho Falls BLM
- Effective
- Ends or expires
- Official severity
- Severe
- Official urgency
- Expected
- Official certainty
- Likely
What is happening
Impacts: Wind and low humidity can lead to rapid spread of fire and more intense fire in receptive fuels.
What the bulletin says to do
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.
Full official description
Bulletin details
...GUSTY WINDS AND LOW HUMIDITY EXPECTED THIS WEEKEND... .A building ridge to the south combined with a trough moving across western Canada will tighten the pressure gradient over the area through the weekend creating breezy to windy conditions for the weekend. This combined with warming temperatures and low humidity will lead to high fire danger across much of eastern Idaho. * 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. * WINDS...West 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Wind and low humidity can lead to rapid spread of fire and more intense fire in receptive fuels.
Official geometry where available
Alert boundary
Lifecycle record
Official revisions
- Update
Red Flag Warning issued August 1 at 1:52PM MDT until August 2 at 9:00PM MDT by NWS Pocatello ID
Official revision - Update
Red Flag Warning issued August 1 at 1:06AM MDT until August 2 at 9:00PM MDT by NWS Pocatello ID
Official revision - Alert
Red Flag Warning issued July 31 at 12:29PM MDT until August 2 at 9:00PM MDT by NWS Pocatello ID
Official revision
Source and limitations
Publisher: Weather Alert Watch. Primary source: NWS Pocatello ID. This page reorganizes official fields and does not add a forecast or expand the affected area.
- CAP status
- Actual
- Message type
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- Last collected