Weather Alerts for Big Hole Mountains

Issued by the National Weather Service

       Special Weather Statement      

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

Areas Affected:
Upper Snake River Valley/Idaho Falls BLM - 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
Effective: Tue, 7/15 1:06pm Updated: Tue, 7/15 7:35pm Urgency: Expected
Expires: Tue, 7/15 9:00pm Severity:  Severe  Certainty: Likely

 
Details:
* AFFECTED AREA...Fire Weather Zone 410 Upper Snake River
Valley/Idaho Falls BLM, 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.

* TIMING...Scattered thunderstorms are expected to develop
during the afternoon and evening hours, supporting the
potential for gusty outflow winds and frequent lightning.

* WINDS...A dry low level environment will promote the potential
for storms to produce gusty outflow wind gusts in excess of 40-
50 mph, locally higher up to around 60 mph.

* RELATIVE HUMIDITY...As low as 15 to 25 percent.

* THUNDERSTORMS...25 to 45 percent coverage expected.

* IMPACTS...Critical fire weather conditions are expected today.
Lightning may generate new fire starts. Any new fire starts or
existing fires may spread rapidly.

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.

Special Weather Statement  SPECIAL WEATHER STATEMENT   Special Weather Statement
BIG HOLE MOUNTAINS

Areas Affected:
Caribou Range - Big Hole Mountains - Teton Valley
Effective: Tue, 7/15 7:20pm Updated: Tue, 7/15 7:35pm Urgency: Expected
Expires: Tue, 7/15 7:45pm Severity:  Moderate  Certainty: Observed

 
Details:
At 719 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Driggs to near Swan Valley. Movement was
east at 40 mph.

HAZARD...Wind gusts in excess of 45 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to outdoor objects is
possible.

Locations impacted include...
Driggs, Swan Valley, northern Palisades Reservoir, Victor, Tetonia,
Irwin, and Pine Creek Pass.

Information:
If outdoors, consider seeking shelter inside a building.

If on or near Palisades Reservoir, get out of the water and move
indoors or inside a vehicle. Strong winds will create rough chop.
Remember, lightning can strike out to 10 miles from the parent
thunderstorm. If you can hear thunder, you are close enough to be
struck by lightning. Move to safe shelter now! Do not be caught on
the water in a thunderstorm.

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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