Severe Thunderstorm Warning 19, NWS Boise, ID

Area Forecast Discussion
National Weather Service Boise ID
253 PM MDT Thu Aug 24 2017

.SHORT TERM...Tonight through Saturday...Satellite across the area
demonstrates increasing cloud development this afternoon as a cold
front remains draped across the OR/ID border. Showers and
thunderstorms are expected with the frontal passage this afternoon
and evening, with the strongest storms expected across the West
Central Mountains of Idaho and west into Baker County, OR. Strong
wind gusts may accompany any stronger storm development this
afternoon. Radar trends show an increase across southern Oregon
and Idaho, with the updated forecast package seeing bumped up
forecasts for these areas. Passage of the front will bring a
return to quieter conditions, though some remnant moisture may
generate a few showers and thunderstorms on Friday. Temperatures
on Friday will be similar to today, though some locations will see
slight cooling. Models in good agreement with the rebuilding of a
ridge across the Intermountain West over the weekend. This will
bring dry and warming conditions on Saturday.

.LONG TERM...Saturday night through Thursday...A strong upper level
ridge will build across the western United States bringing above
normal temperatures starting on Saturday. Temperatures in the
valleys will approach 100F on Monday and Tuesday, slightly below
records at this time. Monsoon moisture will wrap around the ridge
starting on Monday as the ridge aloft weakens. Afternoon showers and
thunderstorms are possible over the higher terrain on Tuesday into
Thursday. Temperatures will begin a downward trend on Tuesday toward
normal as the ridge weakens.

&&

.AVIATION...VFR. SCT-BKN mid and high level clouds. Smoke layers
and haze. Showers and thunderstorms developing in the afternoon
mainly north of a KBNO-KONO-KSNT line. Surface winds SW 5-15kt
during the afternoon in SE Oregon and Magic Valley with variable
winds elsewhere, becoming light after sunset. Gusty outflow winds to
45kt possible in the vicinity of thunderstorms. Winds aloft at 10kft
MSL: SW 10-20kt.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Red Flag Warning until midnight MDT tonight IDZ400>403.
OR...Red Flag Warning until 11 PM PDT this evening ORZ646.

&&

www.weather.gov/Boise
www.facebook.com/NWSBoise
www.twitter.com/NWSBoise

SHORT TERM...KB
LONG TERM....KA/WH
AVIATION.....KA

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