# Red Flag Warning: 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 — retained record

> Retained us-gov-api record from us-gov-api:noaa-weather.

Canonical: https://highsignal.app/data/records/7356d404c8395d57

[← sources](https://highsignal.app/data)


source: [us-gov-api](https://highsignal.app/data/us-gov-api) (us-gov-api:noaa-weather)  published 2026-08-01 01:06 ingested 2026-08-01 08:19

[original source ↗](http://www.weather.gov/)

## extract

Red Flag Warning — 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
Severity: Severe. Certainty: Likely.
...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 to southwest 15 to 25 mph with gusts up to 30 mph
Saturday afternoon with gusts to 40 mph Sunday afternoon.

* RELATIVE HUMIDITY...10-15 percent with a few areas falling below
10 percent.

* IMPACTS...Wind and low humidity can lead to rapid spread of
fire and more intense fire in receptive fuels.

## retained text

The historical document was shared with another weather alert and cannot be attributed to this record. The original extract is preserved above; the exact alert link was not retained.