Weather Alert in Idaho
Red Flag Warning issued August 13 at 1:54AM MDT until August 13 at 10:00PM MDT by NWS Pocatello ID
AREAS AFFECTED: Upper Snake River Valley/Idaho Falls BLM; Centennial Mountains and Snake River Range/Targhee NF; Caribou Range/Caribou NF
DESCRIPTION: ...RED FLAG WARNING IN EFFECT FROM NOON TO 10 PM MDT WEDNESDAY FOR GUSTY WINDS, LOW RELATIVE HUMIDITY, AND ISOLATED THUNDERSTORMS FOR FIRE WEATHER ZONES 411, 413, 427, 475 AND 476... ...RED FLAG WARNING IN EFFECT FROM NOON TO 10 PM MDT WEDNESDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 410, 422 AND 425... ..RED FLAG WARNING IN EFFECT FROM NOON TO 10 PM MDT WEDNESDAY FOR GUSTY WINDS, LOW RELATIVE HUMIDITY, AND ISOLATED THUNDERSTORMS FOR FIRE WEATHER ZONES 411 AND 413... The National Weather Service in Pocatello has issued a Red Flag Warning for gusty winds and low relative humidity, which is in effect from noon to 10 PM MDT Wednesday. * 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 and Fire Weather Zone 413 Caribou Range/Caribou NF. * WINDS...Southwest 15 to 25 mph with gusts up to 35 mph. Isolated thunderstorms may produce gusts over 45 mph across Zones 411 and 413. * RELATIVE HUMIDITY...10 to 20 percent. * IMPACTS...The combination of dry fuels, gusty winds, low humidity and potential for lightning will lead to increasing fire spread and more extreme fire behavior.
INSTRUCTION: 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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Weather Topic: What is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
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