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.
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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.
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WINDS: West to southwest 15 to 25 mph with gusts up to 30 mph Saturday afternoon with gusts to 40 mph Sunday afternoon.
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RELATIVE HUMIDITY: 10-15 percent with a few areas falling below 10 percent.
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IMPACTS: Wind and low humidity can lead to rapid spread of fire and more intense fire in receptive fuels.
...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.
A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly based on these criteria for Southeastern Idaho:
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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.
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Thunderstorm coverage of 25 percent, without specific rainfall criteria.
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Other high impact events deemed critical by the National Weather Service and area fire management agencies.
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.
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