FNUS76 KPQR 172338
FWSPQR

SPOT FORECAST FOR TUMBLEBUG...USFS WNF
NATIONAL WEATHER SERVICE PORTLAND OR
438 PM PDT THU SEP 17 2009

FORECAST IS BASED ON REQUEST TIME OF 1540 PDT ON SEPTEMBER 17.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...HIGH PRESSURE OVER THE PACIFIC NORTHWEST WILL MOVE
EASTWARD INTO THE ROCKIES FRIDAY. MEANWHILE A THERMAL TROUGH WILL
BUILD NORTHWARD ALONG THE OREGON COAST. THIS THERMAL TROUGH WILL
DRIFT EASTWARD ACROSS THE CASCADES FRIDAY AFTERNOON...RESULTING IN
SOMEWHAT ENHANCED INSTABILITY OVER THE FIRE AREA FOLLOWED BY DRY
NORTHWEST WINDS LATER FRIDAY AFTERNOON AND EVENING. A PACIFIC COLD
FRONT WILL MOVE ONSHORE ALONG THE OREGON COAST LATE FRIDAY NIGHT
OR SATURDAY MORNING...AND SHOULD BRING SOME RAIN AND HIGHER RH TO
THE FIRE AREA SATURDAY. AT THIS POINT...WETTING RAINS APPEAR
UNLIKELY BUT ARE NOT OUT OF THE QUESTION. STRONG OFFSHORE FLOW...
COUPLED WITH HOT AND VERY DRY WEATHER...ARE STILL EXPECTED TO
DEVELOP EARLY NEXT WEEK.

CHANCE OF WETTING RAIN (CWR) 0.25 INCHES OR GREATER.
THUNDERSTORMS IMPLY GUSTY AND ERRATIC WINDS.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR (%).............0 PERCENT.
MIN TEMPERATURE.....44-48 VALLEYS...UP TO LOWER 50S MIDSLOPES
                    AND RIDGES.
MAX HUMIDITY........55-65 PERCENT MIDSLOPES/RIDGES...UP TO
                    80 PERCENT OR HIGHER IN PROTECTED VALLEYS.
WIND (20 FT)........NORTH 2-5 MPH EARLY IN THE EVENING...
                    DIMINISHING AND BECOMING DOWN-DRAINAGE 0-3 MPH
                    BY 2100. WIND BECOMING EAST 3-7 NEAR RIDGETOPS
                    TOWARD DAYBREAK...WITH GUSTS TO 12 MPH.

.FRIDAY...

SKY/WEATHER.........SUNNY.
CWR (%).............0 PERCENT.
MAX TEMPERATURE.....74-78.
MIN HUMIDITY........22-25 PERCENT.
WIND (20 FT)........EAST TO SOUTHEAST 2-6 MPH WITH MORNING GUSTS
                    TO 12 MPH...STRONGEST WIND NEAR RIDGETOPS.
                    WIND BECOMING UPSLOPE/UPVALLEY 2-6 MPH MIDDAY
                    AND EARLY AFTERNOON...THEN EVENTUALLY BECOMING
                    NORTHWEST TO WEST 4-8 MPH WITH GUSTS 10-15 MPH
                    AFTER 1500.


TIME (PDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
TEMP............48     51     62     73     76     76
RH..............70     65     47     35     26     24
20 FT WIND......E 2-5  E 2-5  E 1-4  NE 1-3 NW 2-5 NW 4-7
   MAX GUST.....12     12     8      7      10     15


.FRIDAY NIGHT...

SKY/WEATHER.........CLEAR EARLY...THEN INCREASING CLOUDS.
CWR (%).............0 PERCENT.
MIN TEMPERATURE.....46-52.
MAX HUMIDITY........65-75 PERCENT.
WIND (20 FT)........WEST 3-7 MPH WITH EARLY EVENING GUSTS TO
                    12 MPH...DECREASING AND BECOMING DOWN-
                    DRAINAGE 1-4 MPH BY MIDNIGHT. SOUTHWEST
                    WIND 4-8 MPH DEVELOPING ON THE RIDGETOPS
                    LATE.


$$
FORECASTER...WEAGLE
REQUESTED BY...MATT WHITE
REASON FOR REQUEST...WILDFIRE
.TAG 20090917.TUMBL.01/PQR