Special Weather Statement, NWS Boise, ID

Area Forecast Discussion
National Weather Service Boise ID
207 PM MDT Thu Aug 5 2021

.SHORT TERM...Tonight through Saturday night...Upper level low
over south central Oregon will pass right over the forecast area
tonight, pushing a cold front through the area. Thunderstorms
ahead and along the front will be capable of severe wind gusts of
60 mph or greater. In addition, northwest winds along and behind
the front will gust 40-50 mph for several hours overnight, and
wind advisories remain in effect overnight for most areas. Showers
and thunderstorms near the upper low will mostly move east of the
forecast area by midday Friday, with some showers over the
central Idaho mountains lingering into the afternoon. Breezy
northwest winds continue during the day Friday, but less strong
than during the overnight hours. Temperatures on Friday will be
below normal, and 10 to 15 degrees cooler than on Thursday. Dry
northwest flow aloft then continues through Saturday and Saturday
night.

.LONG TERM...Sunday through Thursday...An upper level low pressure
trough will cross the Pacific Northwest on Sunday and continue east
to the northern Great Plains on Monday. For our area on Sunday, it
will bring cooler air, gusty west to northwest winds, and isolated
showers and thunderstorms over the west central Idaho mountains. A
portion of the trough will lag behind, keeping temperatures 5 to 10
degrees below normal Monday and Tuesday, but skies will be clear
except for some clouds over the northern mountains. Temperatures
will warm to near normal on Wednesday and a few degrees above normal
on Thursday has an upper level high pressure ridge builds over the
region.

&&

.AVIATION...Generally VFR. Isolated to scattered thunderstorms
continuing overnight, then ending in eastern Oregon Friday morning
and southwest Idaho Friday afternoon, but continuing over the
central Idaho mountains until around 00z/Saturday. Smoke layers
aloft reducing visibility. Surface winds: variable 5-15 kts becoming
W-NW 15-25 kts after 00z with gusts to 50 kts possible. Winds aloft
at 10k feet MSL: SW 15-25 kts becoming W 10-20 kts by 12z/Friday.

Weekend outlook...generally VFR. Smoke layers aloft reducing
visibility. Breezy west-northwest winds Saturday and Sunday
afternoons.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Red Flag Warning until midnight MDT tonight IDZ400-403-420-424.
     Wind Advisory from midnight tonight to 10 AM MDT Friday
     IDZ014>016-028-030.
     Red Flag Warning until 6 AM MDT Friday IDZ401-402.
     Wind Advisory from 9 PM this evening to 6 AM MDT Friday
     IDZ012-029-033.
OR...Red Flag Warning until 11 PM PDT this evening ORZ636.
     Red Flag Warning until 6 AM MDT /5 AM PDT/ Friday ORZ637-646.
     Wind Advisory from 9 PM MDT /8 PM PDT/ this evening to 6 AM MDT
     /5 AM PDT/ Friday ORZ064.
     Wind Advisory from 6 PM MDT /5 PM PDT/ this evening to 6 AM MDT
     /5 AM PDT/ Friday ORZ061>063.

&&

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

SHORT TERM...TB
LONG TERM....JT
AVIATION.....JT

Special Weather Statement
National Weather Service Boise ID
435 PM PDT Thu Aug 5 2021

ORZ062-060000-
Baker County OR-
435 PM PDT Thu Aug 5 2021

...A strong thunderstorm will impact portions of northwestern Baker
County through 500 PM PDT...

At 434 PM PDT, Doppler radar was tracking a strong thunderstorm over
Elkhorn Peak, or 13 miles west of Baker City, moving north at 25 mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

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

This strong thunderstorm will be near...
  Haines around 500 PM PDT.

LAT...LON 4501 11806 4500 11801 4500 11796 4502 11791
      4469 11802 4473 11825 4502 11817 4505 11811
TIME...MOT...LOC 2334Z 194DEG 22KT 4480 11810

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

LC

Special Weather Statement
National Weather Service Boise ID
508 PM PDT Thu Aug 5 2021

ORZ062-060030-
Baker County OR-
508 PM PDT Thu Aug 5 2021

...A strong thunderstorm will impact portions of northwestern Baker
County through 530 PM PDT...

At 505 PM PDT, Doppler radar was tracking a strong thunderstorm near
Rock Creek, or 10 miles northwest of Baker City, moving north at 20
mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Interstate 84, Sumpter, Anthony Lakes Ski Area and Elkhorn Peak.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Heavy rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4500 11801 4500 11796 4502 11791 4472 11806
      4477 11829 4483 11832 4487 11828 4487 11823
      4494 11823 4495 11825 4501 11821 4502 11816
      4505 11813
TIME...MOT...LOC 0005Z 193DEG 17KT 4493 11817

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

SH