Special Weather Statement, NWS Spokane, WA

Area Forecast Discussion
National Weather Service Spokane WA
1146 AM PDT Wed Jun 24 2020

.SYNOPSIS...
Scattered thunderstorms are expected over north Idaho as well as
north central and northeast Washington this afternoon. A few
storms will be capable of brief heavy rain, nickel size hail, and
wind gusts to 45 mph. Thursday and Friday will be dry, with
temperatures well above average. The arrival of a strong cold
front late Friday will bring in cooler temperatures, breezy winds,
showers and the chance for thunderstorms this weekend. The
weekend into the beginning of next week have the potential to be
significantly cooler than average.

&&

.DISCUSSION...

A weak cold front will cross the Idaho Panhandle by early this
afternoon. Surface winds have begun to shift to the west or
southwest in Central Washington, the Columbia Basin, and the
Palouse in response to the frontal passage. Look for the winds to
increase this afternoon with 10 to 20 mph westerlies common
across the open country of eastern Washington. Locally higher
winds gusting into the 30 to 35 mph range are expected around
Wenatchee, Vantage, Waterville and Chelan. Any grass fires that
start in these areas today could have the potential to spread.

Our morning air mass is more humid than we usually experience with
dewpoints in the 50s. These numbers will tumble during the
afternoon with marginally drier west winds. We expect widely
scattered showers and thunderstorms to develop by noon over north
central Washington (before our dewpoints decrease). It will be
interesting to see how much convection forms this afternoon as our
post-frontal air mass continues to dry. Cells that do form will be
able to tap into relatively steep lapse rates aloft leading to the
potential for hail...possibly nickel size or bigger. Wind gusts of
45 mph or more and brief heavy rain will be possible as well with
these cells as the track to the northeast around 25 to 30 mph. At
this time, we are looking at the Republic, Colville, Bonners
Ferry, Sandpoint, and Kellogg areas for the scattered
thunderstorms...some possibly strong. /GKoch

&&

.AVIATION...
18Z TAFS: By noon scattered showers are expected to develop over
far north Idaho and northeast/north central Washington. The high
resolution models aren't forecasting a high concentration of
thunderstorm activity, but a few cells could be strong given rich
surface dewpoints and relatively steep mid-level lapse rates. Some
of the stronger cells will be capable of producing nickel hail,
brief heavy rain, and wind gusts to 45 mph in the Republic,
Colville, Northport, Bonners Ferry, Sandpoint, and Kellogg areas.
At this point, probabilities for thunderstorms in Spokane, Couer
d'Alene, Pullman, and Lewiston is less than 30 percent and not
included in the TAFs. They may be added as we watch radar and
satellite trends this afternoon. /GKoch

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        85  56  83  58  88  62 /  10  10   0   0   0  10
Coeur d'Alene  83  55  81  56  85  61 /  20  10   0   0   0  10
Pullman        82  53  79  55  85  61 /  10  10   0   0   0   0
Lewiston       90  61  87  62  92  67 /  10  10   0   0   0   0
Colville       85  53  85  56  90  58 /  60  20   0   0   0  20
Sandpoint      83  55  81  57  85  60 /  50  30   0   0   0  20
Kellogg        82  56  79  57  83  62 /  30  20   0   0   0  10
Moses Lake     91  60  91  59  98  64 /   0   0   0   0   0   0
Wenatchee      87  60  91  63  94  66 /   0   0   0   0   0  10
Omak           87  59  89  62  93  62 /  20   0   0   0   0  10

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...None.
WA...None.

&&

Hazardous Weather Outlook
National Weather Service Spokane WA
208 PM PDT Wed Jun 24 2020

WAZ034-035-041>044-252115-
Moses Lake Area-Upper Columbia Basin-Wenatchee Area-
East Slopes Northern Cascades-Okanogan Valley-Waterville Plateau-
208 PM PDT Wed Jun 24 2020

This Hazardous Weather Outlook is for portions of Central
Washington...East Central Washington and North Central
Washington.

.DAY ONE...THIS AFTERNOON AND TONIGHT

No hazardous weather is expected at this time.
Breezy conditions will continue this evening.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Friday and Saturday dry, warm and breezy conditions are expected
in Central Washington which may elevate concern for fire spread in
dry grass.

IDZ001-002-004-WAZ036>038-252115-
Northern Panhandle-Coeur d'Alene Area-Central Panhandle Mountains-
Spokane Area-Northeast Mountains-Okanogan Highlands-
208 PM PDT Wed Jun 24 2020

This Hazardous Weather Outlook is for portions of North Idaho...
North Central Washington and Northeast Washington.

.DAY ONE...THIS AFTERNOON AND TONIGHT

No hazardous weather is expected at this time.
This afternoon and evening a chance of thunderstorms is forecast
over the northern Washington mountains into the Idaho Panhandle.
Some storms will be capable of producing nickel sized hail
lightning and downpours, and gusty winds. Isolated storms in the
northest mountains will be capable of golfball sized hail.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Saturday to Monday a threat of isolated to scattered thunderstorms
will bring the threat of lightning and gusty winds as well as
small hail and heavy downpours.

IDZ003-026-027-WAZ031>033-252115-
Idaho Palouse-Lewiston Area-Lewis and Southern Nez Perce Counties-
Northeast Blue Mountains-Lower Garfield and Asotin Counties-
Washington Palouse-
208 PM PDT Wed Jun 24 2020

This Hazardous Weather Outlook is for portions of North Idaho...
North Central Idaho and Southeast Washington.

.DAY ONE...THIS AFTERNOON AND TONIGHT

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Saturday to Monday a threat of isolated to scattered thunderstorms
will bring the threat of lightning and gusty winds as well as
small hail and heavy downpours.

Special Weather Statement
National Weather Service Spokane WA
1220 PM PDT Wed Jun 24 2020

WAZ038-241945-
Okanogan Highlands WA-
1220 PM PDT Wed Jun 24 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN FERRY AND EASTERN
OKANOGAN COUNTIES UNTIL 1245 PM PDT...

At 1217 PM PDT, Doppler radar was tracking a strong thunderstorm 14
miles west of Sherman Pass, or 10 miles southwest of Republic,
moving northeast at 20 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

If this cell remains intact, it will impact... Republic and Curlew
Lake State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4850 11891 4861 11895 4878 11867 4854 11859
TIME...MOT...LOC 1917Z 239DEG 15KT 4857 11879

GKOCH

Special Weather Statement
National Weather Service Spokane WA
1249 PM PDT Wed Jun 24 2020

WAZ038-242015-
Okanogan Highlands WA-
1249 PM PDT Wed Jun 24 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN FERRY COUNTY UNTIL
115 PM PDT...

At 1248 PM PDT, Doppler radar was tracking a strong thunderstorm
between Republic and Sherman Pass moving east at 20 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Sherman Pass on Highway 20.

LAT...LON 4853 11860 4866 11869 4883 11833 4859 11821
TIME...MOT...LOC 1948Z 248DEG 15KT 4864 11855

GKOCH

Special Weather Statement
National Weather Service Spokane WA
154 PM PDT Wed Jun 24 2020

WAZ037-242130-
Northeast Mountains WA-
154 PM PDT Wed Jun 24 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN STEVENS AND NORTHERN
PEND OREILLE COUNTIES UNTIL 230 PM PDT...

At 153 PM PDT, Doppler radar was tracking a strong thunderstorm near
Metaline Falls and Sullivan Lake, moving east at 20 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Metaline Falls, Metaline, Sullivan Lake Campground and Noisy Creek
Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4878 11750 4887 11751 4899 11704 4877 11704
TIME...MOT...LOC 2053Z 256DEG 16KT 4883 11735

SB

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