FNUS76 KSEW 301619
FWSSEW

SPOT FORECAST FOR RAINBOW BRIDGE...NPS NORTH CASCADES
NATIONAL WEATHER SERVICE SEATTLE WA
919 AM PDT FRI JUL 30 2010

FORECAST IS BASED ON REQUEST TIME OF 0930 MDT ON JULY 30.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE IN SEATTLE.

.DISCUSSION...THE BIG THING TO WATCH DURING THE NEXT 36 HOURS WILL
BE THE RISK OF THUNDERSTORMS. COVERAGE IN THE VICINITY OF THE FIRE
SHOULD BE ISOLATED THIS AFTERNOON. A CONTINUATION OF MOIST AND
UNSTABLE CONDITIONS SHOULD MAINTAIN ISOLATED THUNDERSTORM RISK ALL
THE WAY THROUGH TONIGHT. AN UPPER LOW CENTER WILL PASS NEAR THE
FIRE ON SATURDAY...INCREASING THUNDERSTORM COVERAGE INTO THE
SCATTERED CATEGORY. ANY THUNDERSTORMS TODAY WILL MOVE BY QUICKLY
WITH ONLY A BRIEF PERIOD OF RAIN. THUNDERSTORMS ON SATURDAY WILL
BE SLOWER MOVING AND WILL BE CAPABLE OF DUMPING MORE COPIOUS
RAINFALL AMOUNTS. OTHERWISE...DIURNAL WINDS WILL BE THE RULE.

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

.TODAY...

SKY/WEATHER.........PARTLY CLOUDY. ISOLATED AFTERNOON THUNDERSTORMS
                    POSSIBLE.
CWR.................0%.
MAX TEMPERATURE.....95 AT 1400 FEET...78 AT 4200 FEET.
MIN HUMIDITY........16 PERCENT AT 1400 FEET...24 PERCENT AT
                    4200 FEET.
WIND (20 FT)........UPSLOPE 5 TO 7 MPH OVER THE SLOPE THIS
                    MORNING. EARLY THIS AFTERNOON...WIND BECOMING
                    MORE DOMINATED BY SOUTHEASTERLY WINDS 6 TO 8
                    MPH BLOWING UP THE STEHEKIN VALLEY.
                    AFTER 1600 PDT...A SHIFT TO NORTHWESTERLY WINDS
                    6 TO 8 MPH BLOWING DOWN THE STEHEKIN VALLEY.
HAINES INDEX........MID-LEVEL....5 OR MODERATE.
                    HIGH-LEVEL...4 OR LOW.
LAL.................1 THIS MORNING...2 THIS AFTERNOON.

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY. ISOLATED SHOWERS AND THUNDERSTORMS
                    AT ANY TIME DURING THE NIGHT.
CWR.................LESS THAN 10%.
MIN TEMPERATURE.....55 AT 1400 FEET...58 AT 4200 FEET.
MAX HUMIDITY........65 PERCENT AT 1400 FEET...55 PERCENT AT 4200 FEET.
WIND (20 FT)........NORTHWEST WINDS 5 TO 8 MPH THIS EVENING...BECOMING
                    DOWNSLOPE 3 TO 4 MPH BY LATE THIS EVENING.
HAINES INDEX........MID-LEVEL....5 OR MODERATE.
                    HIGH-LEVEL...4 OR LOW.
LAL.................2.

.SATURDAY...

SKY/WEATHER.........PARTLY SUNNY. SCATTERED SHOWERS AND THUNDERSTORMS.
CWR (>0.20")........20 PERCENT.
MAX TEMPERATURE.....88 AT 1400 FEET...71 AT 4200 FEET.
MIN HUMIDITY........21 PERCENT AT 1400 FEET...36 PERCENT AT 4200 FEET.
WIND (20 FT)........UPSLOPE 5 TO 7 MPH OVER THE SLOPE IN THE
                    MORNING. EARLY THIS AFTERNOON...WIND BECOMING
                    MORE DOMINATED BY SOUTHEASTERLY WINDS 6 TO 8
                    MPH BLOWING UP THE STEHEKIN VALLEY.
                    AFTER 1600 PDT...A SHIFT TO NORTHWESTERLY WINDS
                    6 TO 8 MPH BLOWING DOWN THE STEHEKIN VALLEY.
                    NEARBY THUNDERSTORMS WILL BRING WIND GUSTS OVER
                    20 MPH CHANNELLED IN THE STEHEKIN VALLEY.
HAINES INDEX........MID-LEVEL....4 OR LOW.
                    HIGH-LEVEL...3 OR VERY LOW.
LAL.................3.

$$
FORECASTER...HANER
REQUESTED BY...MICHAEL KOENEN
TYPE OF REQUEST...WILDFIRE
.TAG 20100730.RAINB.01/SEW