FNUS76 KSEW 080109
FWSSEW

SPOT FORECAST FOR WINTHROP GLACIER...NPS MT RAINER
NATIONAL WEATHER SERVICE SEATTLE WA
609 PM PDT SUN JUL 7 2013

FORECAST IS BASED ON INCIDENT TIME OF 1734 PDT ON JULY 07.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE IN SEATTLE.

.DISCUSSION...A MOSTLY DRY UPPER LEVEL TROUGH WILL MOVE ACROSS
WESTERN WASHINGTON TONIGHT AND WILL BE OVER EASTERN WASHINGTON BY
MID-DAY MONDAY. THE AIR MASS IS MOSTLY DRY BUT SW WINDS AHEAD OF
THE TROUGH AND BLOWING UPSLOPE OVER MOUNT RAINIER APPEAR TO BE
GENERATING SOME CLOUD COVER OVER AND TO THE NE OF THE MOUNTAIN.
BASED ON THE SUNRISE MOUNTAIN WEBCAM THESE CLOUDS MAY OBSCURE THE
TERRAIN AT TIMES THIS EVENING. THE AIR MASS SHOULD BE A LITTLE
DRIER AFTER THE TROUGH PASSES EARLY MONDAY MORNING AND WINDS SHIFT
TO NORTHWEST...BUT IT IS HARD TO SAY HOW MUCH UPSLOPE CLOUD COVER
WILL BE GENERATED.

FLIGHT CONDITIONS WILL BE PREDOMINANTLY VFR AROUND THE MOUNTAIN BUT
THE LEE SIDE CLOUD COVER COULD POSSIBLY CAUSE BRIEF IFR CONDITIONS.

        WINDS ALOFT FROM 10000 TO 15000 FEET
TONIGHT THROUGH MIDNIGHT -  SW 10-20 KT
TONIGHT AFTER MIDNIGHT   -   W 10-20 KT
MON MORNING 6 AM- NOON   -  NW 10-15 KT
MON AFTERNOON -             NW  5-10 KT

STRONGEST WINDS WILL BE NEAR 15000 FEET.

ISOLATED THUNDERSTORMS HAVE DEVELOPED OVER AND EAST OF THE CASCADE
CREST THIS AFTERNOON AS THE TROUGH APPROACHES. NO THUNDERSTORMS
ARE FORECAST FOR THE PARK...BUT AN ISOLATED CELL CANNOT BE
COMPLETELY RULED OUT.


 FORECAST FOR SLOPE WIND SPEED ARE 10
 MINUTE AVERAGES REFLECTING RAWS WINDS.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR...SOME LEE SIDE CLOUDINESS
CWR.................LESS THAN 10%.
MIN TEMPERATURE.....AROUND 26.
MAX HUMIDITY........60 PERCENT.
SLOPE/VALLEY.......WEST WINDS 4 TO 9 MPH.

.MONDAY...

SKY/WEATHER.........SUNNY.
CWR.................LESS THAN 10%.
MAX TEMPERATURE.....AROUND 37.
MIN HUMIDITY........46 PERCENT.
SLOPE/VALLEY.......NORTHWEST WINDS 5 TO 13 MPH.

$$
FORECASTER...KAM
REQUESTED BY...MATT MEDFORD
TYPE OF REQUEST...SAR
.TAG 20130707.WINTH.01/SEW