Weather Alerts for Big Hole Mountains

Issued by the National Weather Service

Red Flag Warning  RED FLAG WARNING   Red Flag Warning
BIG HOLE MOUNTAINS

Areas Affected:
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
Effective: Fri, 7/31 12:29pm Updated: Fri, 7/31 2:29pm Urgency: Expected
Expires: Sat, 8/1 6:00am Severity:  Severe  Certainty: Likely

 
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.

The National Weather Service in Pocatello has issued a Red Flag
Warning for gusty winds and low relative humidity, which is in
effect from 2 PM Saturday to 9 PM MDT Sunday. The Fire Weather
Watch is no longer in effect.

* 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 45 mph during the
afternoon and early evening hours both Saturday and Sunday.

* RELATIVE HUMIDITY...As low as 7 percent.

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

Information:
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.

Heat Advisory  HEAT ADVISORY   Heat Advisory
BIG HOLE MOUNTAINS

Areas Affected:
Shoshone/Lava Beds - Arco/Mud Lake Desert - Upper Snake River Plain - Lower Snake River Plain - Eastern Magic Valley - Raft River Region - Bear Lake Valley - Teton Valley - Beaverhead/Lemhi Highlands - Lost River Valleys - Challis/Pahsimeroi Valleys - Wood River Foothills
Effective: Fri, 7/31 11:46am Updated: Fri, 7/31 2:29pm Urgency: Expected
Expires: Sat, 8/1 5:15am Severity:  Moderate  Certainty: Likely

 
Details:
* WHAT...Temperatures up to 104 expected. Overnight lows will cool
into the 60s  and low 70s in the affected area, which is 10 to 15
degrees above normal for the time of year.

* WHERE...Challis/Pahsimeroi Valleys, Lost River Valley, Wood River
Foothills, Beaverhead - Lemhi Highlands, Teton Valley, Eastern
Magic Valley, Shoshone/Lava Beds, Arco/Mud Lake Desert, Bear Lake
Valley, Lower Snake River Plain, Raft River Region, and Upper Snake
River Plain.

* WHEN...From midnight tonight to midnight MDT Saturday Night.

* IMPACTS...Hot temperatures may cause heat illnesses such as heat
exhaustion and heatstroke.

* ADDITIONAL DETAILS...Elevations below 5500 feet, the Teton Valley,
and the Bear Lake basin are the areas most affected.

Information:
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.

If you do not have air conditioning in your home or lack shelter, you
can call 211 or visit 211-idaho.communityos.org for assistance
locating appropriate shelter from the heat.

CoCoRaHS (Community Collaborative Rain, Hail and Snow Network) Station Number: ID-GM-5 Live Lightning Map - USA Boise Skywarn Spotter ID: DO21 AlertID Southwestern Weather Network
Northwestern Weather Network


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