Flash Flood Watch 3, NWS Spokane, WA

227 
WGUS66 KOTX 260557
FFAOTX

Flood Watch
National Weather Service Spokane WA
1057 PM PDT Fri May 25 2018


IDC061-069-WAC003-260700-
/O.EXP.KOTX.FF.A.0003.000000T0000Z-180526T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lewis-Nez Perce-Asotin-
Including the cities of Kamiah, Craigmont, Nezperce, Winchester, 
Lewiston, Lapwai, Peck, Culdesac, Gifford, Clarkston, Asotin, 
and Anatone
1057 PM PDT Fri May 25 2018

...FLASH FLOOD WATCH WILL EXPIRE AT 11 PM PDT THIS EVENING...

The Flash Flood Watch for portions of North Central Idaho and
Southeast Washington will expire at 11 PM PDT this evening.
Showers and isolated thunderstorms will continue through the night
but rainfall amounts will not warrant the flash flood watch to
continue. 

$$

Area Forecast Discussion
National Weather Service Spokane WA
1126 AM PDT Fri May 25 2018

.SYNOPSIS...
It will be another warm day with afternoon temperatures in the
upper 70s to mid 80s. Thunderstorms are expected to develop late
in the day, and some may be capable of producing hail and heavy
rain over the southern Idaho Panhandle. A few showers may linger
into Saturday morning before drier weather arrives for the
Memorial Day weekend. Cooler weather is expected by the middle of
next week.

&&

.DISCUSSION...
High clouds spreading into the region from the south. But there is
a back edge to these that's apparent over the northeast Oregon
mountains, so clouds in southeast Washington and the southern
Idaho panhandle will be decreasing. This will allow afternoon
heating to destabilize the atmosphere and cause the formation of
thunderstorms. Atmospheric moisture is once again abundant with
dew points in the mid 50s and precipitable water over an inch. So
this would favor very wet thunderstorms. But the difference
between today and previous days is that the atmospheric winds are
a little stronger. So any storms that do form will be moving along
at about 15-20 mph. This should limit the potential for flash
flooding. Can't rule this out completely, especially if a storm
went over an urban area.

There's also more atmospheric wind shear this afternoon. Not
enough to produce really strong storms, but enough that we
shouldn't see the short-lived nature of the storms past week.
The shear could also result in storms that could bring larger hail
or damaging winds. All of this activity would mainly be south and
east of the Lewiston area.

There is some upper level forcing in the atmosphere from the
closed low well to our south. This forcing will likely keep the
showers and thunderstorms over southeast WA and southern Panhandle
going through much of the night.  RJ

&&

.AVIATION...
18Z TAFS: Mid and high clouds will move over most the area today
and this evening. Evening thunderstorms are possible for KPUW and
KLWS. Some of these storms could be strong with heavy rain, hail
and strong winds. None of these have a high enough probability to
put into the TAF. Elsewhere gusty evening winds are expected to
develop at KEAT and KMWH.  RJ

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        79  57  71  49  78  54 /  10  10  20   0   0   0
Coeur d'Alene  80  55  70  47  78  52 /  10  30  20  10  10   0
Pullman        76  54  65  46  73  51 /  10  60  40  10  10   0
Lewiston       82  61  71  52  80  56 /  10  70  50  10  10  10
Colville       82  54  80  49  86  51 /  10  10  10   0   0   0
Sandpoint      80  53  74  46  79  49 /  10  20  20  10  10   0
Kellogg        78  54  67  46  76  50 /  20  60  40  10  10  10
Moses Lake     82  54  78  49  84  53 /   0  10   0   0   0   0
Wenatchee      81  53  76  52  84  55 /   0   0   0   0   0   0
Omak           82  54  79  51  85  53 /  10  10   0   0   0   0

&&

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

&&

Hazardous Weather Outlook
National Weather Service Spokane WA
449 AM PDT Fri May 25 2018

IDZ003-004-026-027-WAZ031>033-261300-
Idaho Palouse-Central Panhandle Mountains-Lewiston Area-
Lewis and Southern Nez Perce Counties-Northeast Blue Mountains-
Lower Garfield and Asotin Counties-Washington Palouse-
449 AM PDT Fri May 25 2018

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

.DAY ONE...TONIGHT

Showers and thunderstorms will move into the region this evening.
Some storms will be strong and have the potential to produce gusty
winds, small hail and heavy rainfall. The area of concern for the
stronger storms will be from the Blue mountains northeast to
Lookout Pass and areas to the south and east.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

No hazardous weather is expected at this time.

IDZ001-002-WAZ034>038-041>044-261300-
Northern Panhandle-Coeur d'Alene Area-Moses Lake Area-
Upper Columbia Basin-Spokane Area-Northeast Mountains-
Okanogan Highlands-Wenatchee Area-East Slopes Northern Cascades-
Okanogan Valley-Waterville Plateau-
449 AM PDT Fri May 25 2018

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

.DAY ONE...TONIGHT

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

No hazardous weather is expected at this time.