FNUS76 KSEW 312148
FWSSEW

SPOT FORECAST FOR RAINBOW BRIDGE...NPS NORTH CASCADES
NATIONAL WEATHER SERVICE SEATTLE WA
248 PM PDT SAT JUL 31 2010

FORECAST IS BASED ON REQUEST TIME OF 1423 PDT ON JULY 31.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE IN SEATTLE.

.DISCUSSION...AN UPPER LOW CENTER WILL PASS CENTRAL WASHINGTON
THIS EVENING AND EXIT ON SUNDAY. LINGERING THUNDERSTORMS THIS
EVENING COULD DROP COPIOUS...WETTING RAINFALL ON THE FIRE.
HOWEVER...WITH ALL CONVECTIVE SITUATIONS...RAINFALL CAN BE HIT-OR-
MISS. AS THE SYSTEM EXITS ON SUNDAY...A MORE STABLE AIR MASS WILL
SIGNIFICANTLY CUT BACK THUNDERSTORM COVERAGE. OTHERWISE...A
SOMEWHAT MUGGY AIR MASS WILL BE IN PLACE FOR THE FIRST HALF OF THE
COMING WEEK. OUTSIDE OF THUNDERSTORM OUTFLOW...WINDS WILL SIMPLY BE
A MATTER OF DIURNAL AND TERRAIN EFFECTS.

 FORECAST FOR 20 FOOT WIND SPEED (VALLEYS AND RIDGE TOPS) ARE 10
 MINUTE AVERAGES REFLECTING RAWS WINDS.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLOUDY. SHOWERS LIKELY WITH SCATTERED
                    THUNDERSTORMS THIS EVENING...TAPERING OFF LATE
                    TONIGHT.
CWR (>0.20")........25 PERCENT.
MIN TEMPERATURE.....55-58 ALL ELEVATIONS.
MAX HUMIDITY........75-85 PERCENT ALL ELEVATIONS.
WIND (20 FT)........NORTHWESTERLY DOWNVALLEY WINDS 5 TO 7 MPH...
                    DECREASING TO 2 TO 4 MPH AFTER 2200 PDT.
HAINES INDEX........MID-LEVEL....3 OR VERY LOW.
                    HIGH-LEVEL...3 OR VERY LOW.
LAL.................3 THIS EVENING. 2 OVERNIGHT.

.SUNDAY...

SKY/WEATHER.........A MIX OF SUN AND THICKER HIGH CLOUDS AT START
                    OF SHIFT. CUMULUS BUILIDUPS DEVELOPING BY LATE
                    MORNING WITH A CHANCE OF SHOWERS BY EARLY
                    AFTERNOON. THERE IS AN OUTSIDE POSSIBILITY OF
                    A STRAY STRIKE OF LIGHTNING FROM BUILDUPS.
CWR (>0.20")........10%.
MAX TEMPERATURE.....86 DEGREES AT 1400 FEET.
                    71 DEGREES AT 4600 FEET.
MIN HUMIDITY........26 PERCENT AT 1400 FEET.
                    45 PERCENT AT 4600 FEET.
WIND (20 FT)........UPSLOPE/UPVALLEY WIND OF 5 TO 7 MPH DEVELOPING
                    AROUND 1000 PDT. WIND SHIFTING TO NORTHWESTERLY
                    DOWNVALLEY 6 TO 8 MPH AROUND 1600 PDT.
HAINES INDEX........MID-LEVEL....3 OR VERY LOW.
                    HIGH-LEVEL...2 OR VERY LOW.
LAL.................1 IN THE MORNING...2 IN THE AFTERNOON.

$$
FORECASTER...HANER
REQUESTED BY...FBAN
TYPE OF REQUEST...WILDFIRE
.TAG 20100731.RAINB.01/SEW