Special Weather Statement, NWS Pocatello, ID

Area Forecast Discussion
National Weather Service Pocatello ID
210 PM MDT Thu Jul 20 2017

.DISCUSSION...Monsoonal moisture made a stronger push last night
than anticipated. As a result, we've had storms over the Snake
Plain into the Magic Valley today. A front is moving through the
region this afternoon. Thunderstorms will gradually move off to
the east with the front this evening. Could see a stray storm
remain over the extreme southeast corner late tonight into early
Friday morning. Otherwise, drier air will work back into the
region providing dry weather through the weekend. Looks like
monsoonal moisture returns to the area next week. This will
produce a threat for storms just about every day next week.

Valle

&&

.AVIATION...Models have done an extremely poor job handling
shower and t-storm activity so far today across the region. Based
aviation forecast for this afternoon largely on radar and
satellite trends, blending toward model guidance early this eve
and tonight. Expecting t-storms to continue for the next several
hours near KPIH/KIDA, and through early eve near KDIJ, while
KSUN/KBYI remain dry. Coverage should remain isolated to
scattered, and do not have confidence on timing/coverage to go
higher than VCTS. As usual, the strongest cells could produce
gusty/erratic outflow winds and some hail. Otherwise, expecting
VFR conditions at all terminals through tonight and throughout
Fri. Winds this afternoon will be a bit gusty outside of t-storm
activity as reflected in the TAFs. -KSmith/Valle

&&

.FIRE WEATHER...Red flag warnings remain in effect until 9 pm for
elevations below 6000 feet in zone 476 as well as zone 410 for wind
gusts and low humidity.  Thudnerstorms occurring along cold front
and expect isolated storms late this afternoon and early evening
mainly in zones 411 and 413.  Expect more docile conditions Friday
with wind gusts expected to stay under warning criteria and no
thunderstorms expected.  Upper ridge builds over Idaho Saturday with
hot and dry conditions expected with light winds.  Expect a pattern
change Monday with monsoonal moisture returning ahead of an
approaching trof with showers and thunderstorms possible Monday
through Thursday of next week.
GK

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning until 9 PM MDT this evening for IDZ410-476.

&&

Special Weather Statement
National Weather Service Pocatello ID
1215 PM MDT THU JUL 20 2017

IDZ017-021-022-201900-
South Central Highlands ID-Lower Snake River Plain ID-
Eastern Magic Valley ID-
1215 PM MDT THU JUL 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN BLAINE...
NORTHWESTERN BANNOCK...CENTRAL POWER AND SOUTHWESTERN BINGHAM
COUNTIES UNTIL 100 PM MDT...

At 1214 PM MDT, Doppler radar was tracking a strong thunderstorm near
Neeley, moving northeast at 35 mph.

Winds in excess of 40 mph and frequent lightning will be possible
with this storm. Boaters on American Falls Reservoir should seek
shelter now.

Locations impacted include...
American Falls, Neeley, American Falls Reservoir, Chubbuck,
Aberdeen, Fort Hall Buffalo Lodge, Springfield, Pocatello Airport,
Sterling and Massacre Rocks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

If on or near American Falls Reservoir, get out of the water and
move indoors or inside a vehicle. 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.

&&

LAT...LON 4262 11303 4282 11327 4316 11266 4293 11239
TIME...MOT...LOC 1814Z 231DEG 31KT 4275 11301

Valle

Special Weather Statement
National Weather Service Pocatello ID
102 PM MDT THU JUL 20 2017

IDZ019-201945-
Upper Snake Highlands ID-
102 PM MDT THU JUL 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN TETON COUNTY UNTIL 145
PM MDT...

At 102 PM MDT, Doppler radar was tracking a strong thunderstorm near
Tetonia or near Driggs, moving northeast at 35 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Driggs, Felt and Tetonia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4363 11120 4377 11136 4397 11105 4371 11105
TIME...MOT...LOC 1902Z 229DEG 29KT 4375 11121

VALLE

Special Weather Statement
National Weather Service Pocatello ID
147 PM MDT THU JUL 20 2017

IDZ021-023-202030-
Caribou Highlands ID-Lower Snake River Plain ID-
147 PM MDT THU JUL 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CARIBOU...
SOUTHEASTERN BONNEVILLE AND SOUTHEASTERN BINGHAM COUNTIES UNTIL 230
PM MDT...

At 145 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles north of Chesterfield, moving east at 30 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm. Boaters on Blackfoot Reservoir should seek shelter now.

Locations impacted include...
Wayan, Chesterfield Reservoir, Blackfoot Reservoir, Cutthroat Trout
Campground, Trail Creek Campground and Grays Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

If on or near Blackfoot Reservoir, get out of the water and move
indoors or inside a vehicle. 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.

&&

LAT...LON 4286 11195 4321 11198 4326 11136 4300 11123
TIME...MOT...LOC 1945Z 248DEG 27KT 4298 11186

Valle

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