Weather Alerts for Big Hole MountainsIssued by the National Weather Service |
Special Weather Statement
 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 |
||
| 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. |
||
