[ W WA | SW WA and W OR | SE WA and NE OR | NE WA and N ID ]

Western Washington


822 
FXUS66 KSEW 031600
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
900 AM PDT MON AUG 3 2015

.SYNOPSIS...A LOW PRESSURE SYSTEM ALOFT WILL PREVAIL OVER THE
REGION THROUGH MIDWEEK. THIS COMBINED WITH LOW LEVEL ONSHORE FLOW
WILL RESULT IN COOLER WEATHER. DAYTIME TEMPERATURES WILL REMAIN
ABOVE NORMAL ACROSS MUCH OF THE AREA TODAY...BUT WILL BE NEAR
NORMAL TUESDAY AND WEDNESDAY.

&&

.SHORT TERM...
STRATUS BLANKETED MUCH OF THE COAST THIS MORNING WHILE THE
INTERIOR /EAST OF THE OLYMPIC RANGE/ WAS BLANKETED BY MID AND
HIGH CLOUDS. THERE WERE A FEW SPRINKLES FALLING FROM THE
ALTOCUMULUS CLOUDS. IN CONTRAST...SKIES WERE MOSTLY SUNNY OVER THE
OLYMPICS...MUCH OF THE STRAIT OF JUAN DE FUCA...AND PARTS OF THE
NORTHWEST INTERIOR. ANTICIPATE CLEARING FROM THE WEST THIS
MORNING...WITH SKIES BECOMING MOSTLY SUNNY OVER MUCH OF THE CWA
THIS AFTERNOON. THE EXCEPTION WILL BE THE COAST...WHERE STRATUS
WILL PERSIST OVER SOME AREAS.

MEANWHILE...AN UPPER LEVEL TROF WILL MOVER OVER THE REGION DURING
THE DAY TODAY. THE MAIN IMPACT THIS SYSTEM WILL HAVE ON OUR
WEATHER WILL BE TO STRENGTHEN THE SURFACE ONSHORE PRESSURE
GRADIENT. THIS WILL RESULT IN COOLER TEMPS.

LOW CLOUDS WILL BECOME MORE WIDESPREAD ALONG THE COAST TONIGHT
THEN  PUSH DOWN THE STRAIT AND THROUGH THE CHEHALIS GAP
OVERNIGHT. STRATUS WILL LIKELY FILL IN ACROSS MOST THE LOWLANDS
WITH A CLOUDY START TO THE DAY ON TUESDAY. UPPER HEIGHTS WILL BE
LOWER AND THE INCREASED MARINE INFLUENCE SHOULD HOLD HIGH
TEMPERATURES TO THE 70S OVER THE INTERIOR...NEAR AVERAGE FOR EARLY
AUGUST. THIS PATTERN WILL REPEAT ON WEDNESDAY. MERCER/05

.LONG TERM FROM THE PREV DISCUSSION...
THE UPPER LOW SHOULD START TO MIGRATE EWD THURSDAY WITH WEAK
RIDGING ON FRIDAY. ONSHORE FLOW WILL BE LIGHTER WITH LESS CLOUDS
AND SLIGHTLY WARMER TEMPERATURES. HIGHS MAY REACH THE LOW 80S
TOWARD THE END OF THE WEEK.

MODELS DISAGREE ON THE PATTERN THIS NEXT WEEKEND. SOLUTIONS RANGE 
FROM A WEAK AND DRY SPLIT TROUGH TO A MORE CONSOLIDATED LOW. MOST 
SOLUTIONS SHOW SOME QPF OVER THE PAC NW SO WILL LEAVE THE SHOWERS
IN  THE FORECAST. ONSHORE FLOW WILL PROBABLY PICK UP WITH
MODERATING DAYTIME TEMPERATURES. MERCER

&&

.AVIATION...AN UPPER LEVEL TROUGH WILL APPROACH FROM THE NORTHWEST 
TODAY AND TONIGHT BRINGING SW FLOW ALOFT. A WEAK COLD FRONT WILL 
APPROACH THE COAST TODAY...THEN MOVE INLAND TONIGHT. THE MAIN EFFECT 
OF THE FRONT WILL BE TO SPREAD A DEEP STRATUS LAYER INLAND TONIGHT 
AS WELL AS INCREASE LOW LEVEL ONSHORE FLOW. 
 
VISIBLE SATELLITE IMAGERY THIS MORNING SHOWS A STRIP OF SHALLOW 
STRATUS ALONG THE NORTH COAST OF THE OLYMPIC PENINSULA AROUND PORT 
ANGELES...AND A MORE EXTENSIVE AREA OF STRATUS FROM THE WESTERN 
STRAIT OF JUAN DE FUCA AND ALONG THE WASHINGTON COAST TO WELL 
OFFSHORE. IN THE INTERIOR THERE IS JUST ABUNDANT MID AND HIGH 
CLOUDINESS. EXPECT THE STRATUS IN THE STRAIT TO BURN OFF...BUT THE 
STRATUS ALONG THE COAST WILL GENERALLY REMAIN OVER THAT AREA. ACROSS 
THE INTERIOR...MID AND HIGH LEVEL MOISTURE...REMNANTS OF OLD 
MONSOONAL MOISTURE ORIGINATING IN THE DESERT SOUTHWEST...WILL 
CONTINUE TO STREAM INTO THE AREA.

ONSHORE FLOW WILL INCREASE RAPIDLY THIS EVENING AS A FRONT NOW OVER 
NW VANCOUVER ISLAND SWINGS SE ACROSS THE AREA. WITH THE INCREASE IN 
ONSHORE FLOW...EXPECT STRATUS WITH BASES 040-050 TO SPREAD INLAND 
THEN BASES WILL LOWER TO AROUND 020 OVERNIGHT. STRATUS BASES AROUND 
010-015 TODAY AND THIS EVENING WILL LIKELY LOWER TO 007-010 LATER 
TONIGHT INTO TUE MORNING. ALBRECHT 
 
KSEA...GOOD VFR CONDITIONS WITH ONLY MID AND HIGH CLOUDS WILL 
CONTINUE TODAY. EXPECT LIGHT SOUTH TO SOUTHWESTERLY WIND THROUGH 
THIS EVENING. ALBRECHT

&&

.MARINE...HIGH PRESSURE WELL OFFSHORE COMBINED WITH LOWER PRESSURE 
EAST OF THE CASCADES IS GIVING ONSHORE FLOW TO THE AREA. THE ONSHORE 
FLOW WILL INCREASE LATE THIS AFTERNOON LATE THIS AFTERNOON AS A COLD 
FRONT NOW OVER NORTHERN VANCOUVER ISLAND MOVES SOUTHEAST ACROSS THE 
WATERS. THE STRONG ONSHORE FLOW WILL THEN CONTINUE THROUGH ABOUT 
WEDNESDAY BEFORE GRADUALLY WEAKENING LATER IN THE WEEK.
 
SMALL CRAFT ADVISORY WINDS CONTINUE THIS MORNING OVER THE CENTRAL 
AND EASTERN PORTIONS OF THE STRAIT OF JUAN DE FUCA. WINDS WILL 
RAPIDLY INCREASE LATE THIS AFTERNOON AND WILL REACH 30 TO 40 KNOTS 
THERE THIS EVENING...THEN WILL SLOWLY RELAX EARLY TUESDAY MORNING. A 
SMALL CRAFT ADVISORY IS IN EFFECT FOR THOSE WATERS THROUGH MID 
AFTERNOON AND A GALE WARNING IS IN EFFECT FOR LATE THIS AFTERNOON 
THROUGH TONIGHT. GALE FORCE WINDS WILL LIKELY REDEVELOP TUESDAY 
EVENING. A SMALL CRAFT ADVISORY HAS BEEN ISSUED FOR ADMIRALTY INLET 
STARTING AT 5 PM THIS AFTERNOON AS NORTHWEST WINDS INCREASE WITH THE 
INFLOW THROUGH THE STRAIT OF JUAN DE FUCA. 

SMALL CRAFT ADVISORIES ARE IN EFFECT FOR THE COASTAL WATERS BEYOND 
10 NM FROM THE COASTLINE AS NW PRESSURE GRADIENTS INCREASE THROUGH 
TUESDAY MORNING. WINDS IN THE COASTAL WATERS WILL RELAX MIDDAY 
TUESDAY. ALBRECHT

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.
PZ...GALE WARNING IN EFFECT FROM 3 PM THIS AFTERNOON TIL 5 AM
	 TUESDAY FOR THE CENTRAL AND EASTERN STRAIT OF JUAN DE FUCA.

     SMALL CRAFT ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TIL
	 11 AM TUESDAY FOR THE COASTAL WATERS FROM CAPE FLATTERY TO
	 CAPE SHOALWATER FROM 10 OUT TO 60 NM.

&&

$$

WWW.WEATHER.GOV/SEATTLE

AN ILLUSTRATED VERSION OF THIS FORECAST DISCUSSION CAN BE SEEN AT
WWW.WEATHER.GOV/SEATTLE/GAFD/LATEST_WEBAFD.HTML

[ W WA | SW WA and W OR | SE WA and NE OR | NE WA and N ID ]

Southwestern Washington and Western Oregon


860 
FXUS66 KPQR 031638
AFDPQR

AREA FORECAST DISCUSSION 
NATIONAL WEATHER SERVICE PORTLAND OR 
938 AM PDT MON AUG  3 2015

.SYNOPSIS...A WEATHER DISTURBANCE THAT MOVED NORTH INTO OREGON AND
WASHINGTON SUNDAY WAS STILL LINGERING OVER THE AREA THIS MORNING...
AND WILL FINALLY MOVE OFF TO THE EAST LATER TODAY AND TONIGHT. AN
UPPER TROUGH ALONG THE B.C. COAST WILL CONTINUE TO SAG SOUTH INTO THE
PACIFIC NORTHWEST LATER TODAY THROUGH TUESDAY AND WEDNESDAY. THIS
WILL INCREASE THE ONSHORE FLOW FROM THE NORTHWEST FOR MORE NIGHT AND
MORNING LOW CLOUDS AND COOLER TEMPS...AS WELL AS PRODUCE WESTERLY
FLOW ALOFT THAT WILL PUSH CONVECTION EAST OF THE AREA. AFTER A BRIEF
RESPITE LATE IN THE WEEK...ANOTHER UPPER TROUGH IS FORECAST TO
DEVELOP ALONG THE COAST NEXT WEEKEND INTO EARLY THE FOLLOWING WEEK.
&&

.SHORT TERM...AN UPPER LOW CONTINUES OFF THE CALIFORNIA COAST...
STEERING MOISTURE NORTHWARD INTO OREGON AND WASHINGTON. THE MAIN
SHORT WAVE ASSOCIATED WITH THIS AREA OF MOISTURE LINGERS OVER OUR
FORECAST AREA THIS MORNING. THE MODELS SHOW THIS FEATURE FINALLY
MOVING EAST OF THE AREA LATER TODAY AND TONIGHT...A BIT FASTER ON THE
GFS AND ECMWF MODELS THAN THE NAM12. IT MAY TAKE UNTIL MID TO LATE
AFTERNOON BEFORE THE CLOUDS BREAK AND MOVE OFF TO THE EAST.

IN THE MEANTIME...WE STILL HAVE SOME SHOWERS AROUND...ESPECIALLY OVER
THE CASCADES AND FOOTHILLS...AND FINALLY HAVE A COUPLE OF LIGHTNING
STRIKES NEAR OAKRIDGE IN THE PAST HOUR. THERE ARE A FEW ECHOES
FARTHER WEST AS WELL. THESE WILL NOT END UNTIL THE SHORT WAVE MOVES
EAST IN THE AFTERNOON TO EVENING HOURS. THE FLOW ALOFT WILL TURN MORE
SOUTHWESTERLY LATER TODAY AND TONIGHT AND THIS WILL TEND TO PUSH THE
CONVECTION LATER TODAY TO THE EAST OF THE AREA...WITH ONLY SOME
ISOLATED CONVECTION POSSIBLY LINGERING NEAR THE CASCADE CREST.

THERE IS AN UPPER TROUGH ALONG THE B.C. COAST THAT IS ALREADY SAGGING
SOUTH TOWARD THE PACIFIC NORTHWEST...AND WILL BEGIN AFFECTING THE
PACIFIC NORTHWEST MORE TONIGHT AND TUESDAY. THIS WILL INCREASE THE
ONSHORE FLOW FROM THE NORTHWEST TONIGHT AND TUESDAY AS 500 MB HEIGHTS
FALL INTO THE UPPER 570S. LOOK FOR MORE MORNING LOW CLOUDS INLAND IN
THE NORTH ALONG THE COLUMBIA RIVER THAN WE HAVE SEEN IN A WEEK OR SO.
TEMPS WILL COOL INLAND AS WELL...WITH NEAR 80 NORTH BUT STILL MID TO
UPPER 80S NEAR EUGENE.

THE UPPER TROUGH TO OUR NORTH WILL LINGER THROUGH WEDNESDAY WITH MORE
NORTHWEST ONSHORE FLOW AND MORE MORNING LOW CLOUDS ESPECIALLY NORTH.
TEMPS INLAND IN THE NORTH WEDNESDAY WILL BE 75 TO 80 WITH 80 TO 85
NEAR EUGENE. THIS WILL BE THE COOLEST DAY OF THE WORK WEEK. TOLLESON

.LONG TERM...NO CHANGES. PREVIOUS DISCUSSION FOLLOWS...
MODELS CONTINUE TO SHOW A WEAK/FLAT UPPER LEVEL RIDGE MOVING THROUGH
THE REGION FOR THE LATTER HALF OF THE WORKWEEK. WITH DECREASING
ONSHORE FLOW WE SHOULD SEE TEMPERATURES CLIMB BACK INTO THE MID 80S
BY FRIDAY. ANOTHER UPPER LEVEL TROUGH LOOKS TO APPROACH FROM THE
NORTHWEST OVER THE WEEKEND. HOWEVER...MODELS CONTINUE TO DIFFER WITH
REGARDS TO ITS TIMING AND STRENGTH. UPPER LEVEL FLOW SHOULD BEGIN TO
TURN TO THE SOUTHWEST LATE FRIDAY AHEAD OF THE TROUGH...SO WILL KEEP
A SLIGHT CHANCE OF THUNDERSTORMS FOR THE OREGON CASCADES. AS THE BASE
OF THE TROUGH PUSHES INLAND WE WILL SEE AN INCREASE IN SHOWER
ACTIVITY ACROSS THE REGION. BASED ON SOME LINGERING INSTABILITY AND
SOUTHWESTERLY FLOW ALOFT HAVE ADDED A SLIGHT CHANCE OF THUNDERSTORMS
TO THE CASCADES. TEMPERATURES OVER THE WEEKEND LOOK TO FALL BACK
TOWARDS SEASONAL NORMALS. /64
&&

.AVIATION...CONDITIONS REMAIN VFR ACROSS THE INTERIOR WITH SOME HIGH
CLOUDS OVERHEAD. ISOLATED SHOWERS WILL CONTINUE TO MOVE NORTH THROUGH
THE MORNING...WITH OCCASIONAL PERIODS OF REDUCED CIGS AND VSBY
POSSIBLE UNDER HEAVIER SHOWERS. THE LIGHTNING THREAT LOOKS TO REMAIN
CONFINED TO THE CASCADES AND FOOTHILLS THROUGH THIS EVENING. CLOUDS
OVER THE INTERIOR SHOULD SCATTER OUT THIS AFTERNOON WITH VFR CIGS
CONTINUING THROUGH TUE. HOWEVER...MARINE STRATUS LOOKS TO PUSH UP THE
COLUMBIA RIVER EARLY TUE MORNING AND COULD BRING A PERIOD OF MVFR
CIGS TO THE METRO TERMINALS.

MVFR STRATUS ALONG THE COAST WILL LIFT AND SCATTER OUT THROUGH THE
MORNING WITH VFR CONDITIONS POSSIBLE THIS AFTERNOON. MVFR MARINE
STRATUS LOOKS TO RETURN THIS EVENING...WITH IFR CIGS AND VSBY
POSSIBLE AFTER 06Z AND CONTINUING THROUGH TUE MORNING.

KPDX AND APPROACHES...VFR CONDITIONS TODAY AND TONIGHT...WITH
MID/HIGH CLOUDS GRADUALLY SCATTERING THIS AFTERNOON. MVFR CIGS
POSSIBLE AFTER 12Z TUE AS MARINE STRATUS PUSHES UP THE COLUMBIA
RIVER. /64
&&

.MARINE...ISOLATED SHOWERS WILL CONTINUE TO MOVE NORTH OVER THE
WATERS THROUGH THE MORNING AND COULD PRODUCE SOME GUSTY WINDS.
HOWEVER...THE LIGHTNING THREAT WILL REMAIN LIMITED DUE TO THE LACK OF
INSTABILITY. THE PERSISTENT NORTHERLY WINDS LOOK TO CONTINUE THROUGH
MUCH OF THE WEEK...WITH GUSTS TO 20 KT POSSIBLE THIS
AFTERNOON/EVENING. A FEW LOCAL GUSTS TO 25 KT POSSIBLE DURING THIS
TIME...BUT NOT EXPECTING THESE TO BE WIDESPREAD ENOUGH TO WARRANT AN
ADVISORY. WINDS FURTHER INCREASE ON TUE AFTERNOON/EVENING AND SUSPECT
AN ADVISORY FOR WINDS WILL BE NECESSARY.

MEANWHILE...OVERALL WAVE HEIGHTS DECREASING A FEW FEET TODAY...BUT
GIVEN THAT SEAS REMAIN FAIRLY SHORT PERIOD AND WIND DRIVEN WILL NEED
TO CONTINUE TO CLOSELY MONITOR OBSERVATIONS OVER THE WATERS. EXPECT
CONDITIONS TO REMAIN BELOW CRITERIA TODAY...BUT AN ADVISOR FOR
HAZARDOUS SEAS MAY BE NEEDED AT A LATER TIME. /64/CULLEN
&&

.PQR WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.
PZ...NONE.

&&

$$

INTERACT WITH US VIA SOCIAL MEDIA		
WWW.FACEBOOK.COM/NWSPORTLAND		
WWW.TWITTER.COM/NWSPORTLAND

THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON 
FROM THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS 
COMMONLY REFERRED TO AS THE FORECAST AREA.

[ W WA | SW WA and W OR | SE WA and NE OR | NE WA and N ID ]

Southeastern Washington and Northeastern Oregon


791 
FXUS66 KPDT 031720 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR 
1020 AM PDT MON AUG 3 2015

UPDATED FOR AVIATION DISCUSSION

.SHORT TERM...TODAY AND TONIGHT...SOUTHERLY FLOW CONTINUES TO PUMP 
MOISTURE INTO THE REGION TODAY PRODUCING MOSTLY CLOUDY SKIES. THERE 
WILL BE SOME ISOLATED TO SCATTERED SHOWERS OVER CENTRAL AND EASTERN 
OREGON MAINLY THIS AFTERNOON AND EVENING ALONG WITH A FEW ISOLATED 
THUNDERSTORMS. REST OF THE FORECAST AREA WILL SEE MOSTLY CLOUDY 
CONDITIONS WITH PERHAPS SOME BRIEF SPRINKLES BUT NOT EXPECTING ANY 
MEASURABLE RAINFALL. CLOUDY COVER WILL HELP HOLD TEMPERATURES DOWN 
TODAY SO AS TO NOT BE SO HOT AS PAST DAYS. ALSO EXPECT SOME 
INCREASING BREEZY WESTERLY WINDS DURING THE AFTERNOON AND EVENING 
PERIOD THEN DECREASING OVERNIGHT. 
 
&&

.AVIATION...18Z TAFS...VFR CONDITIONS WILL PREVAIL DURING THE NEXT 
24 HOURS AT ALL TAF SITES. THERE MAY BE BRIEF MVFR AT KBDN AND KRDM 
THIS AFTERNOON DUE TO SHOWERS.  THUNDERSTORMS WILL BE POSSIBLE AS 
WELL...BUT WILL WAIT AND AMEND TAFS AS NEEDED...DUE TO LOW 
CONFIDENCE. WINDS WILL INCREASE FROM THE WEST MAINLY IN THE LOWER 
COLUMBIA BASIN AND THE GORGE AREA.  EXPECT WINDS TO BE 15-25KTS.  
WEBER

&&

.FIRE WEATHER...FIRE WEATHER WATCHES FOR THE LOWER COLUMBIA BASIN 
AND THE EAST SLOPES OF THE WASHINGTON AND OREGON CASCADES HAVE BEEN 
UPGRADED TO RED FLAG WARNINGS IN EFFECT FROM NOON TODAY THROUGH 9 PM 
TUESDAY EVENING DUE TO GUSTY WINDS AND LOW RELATIVE HUMIDITY.  THE 
UPPER LOW MOVING SOUTH FROM BRITISH COLUMBIA WILL CREATE A WESTERLY 
FLOW OVER WASHINGTON AND NORTHERN OREGON AND WILL ALSO ALLOW THE 
ONSHORE FLOW TO DEEPEN THE MARINE LAYER WEST OF THE CASCADES. THIS 
WILL CAUSE MARINE AIR TO SPILL THROUGH THE CASCADE GAPS AND THE 
COLUMBIA RIVER GORGE FOR INCREASING WIND IN THE WARNING AREAS. RH'S 
HAVE BEEN BRUTALLY LOW OVER THE WEEKEND (5-15 PERCENT) AND WILL ONLY 
INCREASE INTO THE TEENS TO LOWER 20S TODAY AND TUESDAY. WISTER 


&&

.PREV DISCUSSION... /ISSUED 300 AM PDT MON AUG 3 2015/ 

SHORT TERM...TODAY THROUGH TUESDAY NIGHT...AN UPPER LEVEL TROUGH OF 
LOW PRESSURE WILL SETTLE OVER BRITISH COLUMBIA AND THE PACIFIC 
NORTHWEST THROUGH THIS PERIOD. THE CENTRAL LOW PRESSURE WITH THIS 
TROUGH WILL REMAIN OVER BRITISH COLUMBIA. THUS WILL SEE THE SOUTH-
SOUTHWEST FLOW OVER THE REGION GRADUALLY SHIFT TO THE WEST-
SOUTHWEST. THUS WILL GRADUALLY SEE MUCH OF THE MOISTURE OVER THE 
PACNW BE PUSHED EAST OF THE REGION. THERE WILL REMAIN THE POTENTIAL 
FOR THUNDERSTORMS OVER THE REGION TODAY. THE BEST CHANCES LOOK TO BE 
ACROSS CENTRAL AND EAST-CENTRAL OREGON, WITH LESSER CHANCES INTO THE 
BLUE MOUNTAINS, GRANDE RONDE VALLEY AND WALLOWA COUNTY. ELSEWHERE 
TODAY EXPECT ONLY A FEW SHOWERS OR LIGHT SPRINKLES. LOW LEVEL FLOW 
WILL BE INCREASINGLY WESTERLY TODAY. THUS EXPECT COOLER HIGH TEMPS 
AT MOST, IF NOT ALL, LOCATIONS. AS THE MOISTURE OVER THE REGION 
SHIFTS EAST TONIGHT AND ON TUESDAY WILL SEE CHANCES OF SHOWERS OR 
THUNDERSTORMS DECREASE SUCH THAT ONLY OUR EASTERN AND SOUTHERN MOST 
AREAS SHOULD BE AFFECTED. 90 

LONG TERM...WEDNESDAY THROUGH SUNDAY NIGHT...A PROGRESSIVE ZONAL 
PATTERN IN THE WESTERLIES WITH A LARGE LONGWAVE MID/UPPER LEVEL LOW 
PRESSURE SYSTEM OVER BRITISH COLUMBIA ON WEDNESDAY SETS UP A 
SOUTHWEST FLOW ALOFT ACROSS INTERIOR PACIFIC NORTHWEST WITH STABLE 
AIRMASS FOR A SLIGHT CHANCE OF OROGRAPHIC SHOWERS OVER FAR EASTERN 
MOUNTAINS OF OREGON WEDNESDAY MORNING. A WEAK LOW AMPLITUDE 
SHORTWAVE MOVES RAPIDLY THROUGH SOUTHEAST WASHINGTON AND NORTHEAST 
OREGON WEDNESDAY AFTERNOON/EVENING FOR A SLIGHT CHANCE OF AN 
AFTERNOON THUNDERSTORM IN THE WALLOWA MOUNTAINS AND ALONG HIGH RIDGE 
IN FAR EASTERN WALLOWA COUNTY. THE SLIGHT CHANCE OF THUNDERSTORMS 
ENDS BEFORE SUNSET WEDNESDAY. WEDNESDAY NIGHT THE AFOREMENTIONED LOW 
MOVES SOUTHEAST AND INTO IDAHO/MONTANA BY DAYBREAK THURSDAY. AS THE 
FORECAST AREA WILL BE ON THE DRY SOUTHERN FLANK OF THE LOW, WE WILL 
HAVE DRY CONDITIONS WEDNESDAY NIGHT AND THURSDAY. THURSDAY NIGHT 
INTO FRIDAY MORNING A MIGRATORY HIGH PRESSURE RIDGE MOVES ACROSS 
FORECAST AREA FOR DRY CONDITIONS. FRIDAY AFTERNOON A MID/UPPER 
LEVEL LOW MOVES INTO CALIFORNIA AND ALLOWS SOME MID LEVEL MOISTURE 
TO MOVE INTO CENTRAL OREGON FOR SLIGHT CHANCE OF AFTERNOON/EVENING 
THUNDERSTORMS. THE LOW MOVES NORTHEAST THROUGH EASTERN OREGON FOR A 
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS FRIDAY NIGHT AND 
SATURDAY. FRIDAY NIGHT THROUGH SUNDAY NIGHT A SOUTHWEST FLOW ALOFT 
ALLOWS AN INFLUX OF ADDITIONAL MOISTURE INTO CENTRAL AND EASTERN 
OREGON FOR A CHANCE OF SHOWERS AND THUNDERSTORMS. POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  91  64  91  56 /  10  10  10  10 
ALW  92  68  92  63 /  10  10  10  10 
PSC  95  64  95  56 /  10  10   0   0 
YKM  89  62  91  55 /  10  10   0   0 
HRI  94  64  94  55 /  10  10   0   0 
ELN  91  65  87  58 /  10  10   0   0 
RDM  86  50  88  46 /  20  20  10  10 
LGD  87  55  88  49 /  20  20  20  10 
GCD  90  56  91  50 /  20  20  20  10 
DLS  91  67  88  58 /  10  10   0   0 

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...RED FLAG WARNING FROM NOON TODAY TO 9 PM PDT TUESDAY FOR ORZ639-
     641.

WA...RED FLAG WARNING FROM NOON TODAY TO 9 PM PDT TUESDAY FOR WAZ639-
     641-675.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

91/89/89

[ W WA | SW WA and W OR | SE WA and NE OR | NE WA and N ID ]

Northeastern Washington and Northern Idaho


591 
FXUS66 KOTX 031746
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
1046 AM PDT MON AUG 3 2015

.SYNOPSIS....
The ongoing drought combined with high heat and low humidity will
contribute to high fire danger throughout the Inland Northwest.
Temperatures on Monday should be a few degrees cooler with an
increase in clouds. Cooler temperatures and locally breezy winds
are expected mainly Monday through Wednesday following the arrival
of a cold front. Another threat of showers and thunderstorms
arrives next weekend.

&&

.DISCUSSION...

Rest of today: No significant changes to the fcst. Winds will
become gusty this afternoon and evening as pressure gradients
strengthen...most notably near the Cascades (Wenatchee region)
and parts of the Palouse. Otherwise...a weak short- wave trough
over Oregon will move NE and keep the threat of very light showers
in the fcst for all areas outside of the Columbia Basin. Pcpn
amnts should be no more than a trace for most towns due to
unimpressive instability and a very dry sub-cloud layer below
10-15k ft.bz

&&

.AVIATION... 
18Z TAFS: Wildfire smoke will continue to reduce visibilities to
to around 5 miles at times for most TAF sites...especially KMWH
and the Spokane area sites into early afternoon. This is similar
to the last few days. Expect greater restrictions around the Lake
Chelan area...including the town of Chelan. A weak weather disturbance
passing through today and tonight will result in mainly mid and
high level clouds...with a few sprinkles possibly reaching the
surface.bz

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        93  66  87  59  82  57 /   0  10  10  10  10  10 
Coeur d'Alene  93  62  87  57  82  54 /   0  10  10  10  10  10 
Pullman        91  57  86  54  82  52 /   0  10  10  10   0   0 
Lewiston       97  68  95  63  90  61 /  10  10  10  10  10  10 
Colville       97  60  89  56  86  54 /  10  10  10  10  10  10 
Sandpoint      90  57  85  51  80  49 /   0  10  10  10  10  10 
Kellogg        95  58  86  54  81  52 /   0  20  20  10  10  10 
Moses Lake     95  62  92  59  88  58 /  10  10   0   0   0   0 
Wenatchee      94  69  90  66  88  64 /  10  10   0   0   0   0 
Omak           96  62  92  58  88  57 /  10  10  10  10  10  10 

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...None.
WA...Red Flag Warning until 9 PM PDT Tuesday for East Washington 
     Central Cascade Valleys (Zone 677)-East Washington Northern 
     Columbia Basin (Zone 673)-East Washington South Central 
     Cascade Valleys (Zone 676).

&&

$$


[ W WA | SW WA and W OR | SE WA and NE OR | NE WA and N ID ]

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