FNUS76 KSEW 201904
FWSSEW

SPOT FORECAST FOR SOUTH POINT...USFS GIFFORD PINCHOT
NATIONAL WEATHER SERVICE SEATTLE WA
1204 PM PDT THU SEP 20 2012

FORECAST IS BASED ON REQUEST TIME OF 1138 PDT ON SEPTEMBER 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE IN SEATTLE.

.DISCUSSION...THE COMBINATION OF AN UPPER LEVEL RIDGE AND A LOW WELL
OFFSHORE HAS BROUGHT ABOUT A VERY DRY MID AND HIGH LEVEL AIR MASS
OVER THE REGION ALONG WITH SLIGHTLY UNSTABLE CONDITIONS OVER THE
AREA. THESE HIGHER LEVEL ATMOSPHERIC CONDITIONS COMBINED WITH THE
LOW AFTERNOON RH LEVELS PUTS THE CENTRAL CASCADES...ZONE 659...AT
BORDERLINE RED FLAG CONDITIONS FOR A SHORT PERIOD THIS AFTERNOON.
LOWER ELEVATION WILL HAVE TERRAIN DRIVEN WINDS WHILE ACROSS THE
RIDGES...MORE WHERE YOU INDICATED THE FIRE TO BE WILL BE UNDER THE
INFLUENCE OF AN EAST TO SOUTHEAST FLOW THROUGH FRIDAY.

BEYOND THIS AFTERNOON...THE NEXT CONCERN IS THE THREAT OF
ISOLATED THUNDERSTORMS LATE FRIDAY NIGHT THROUGH SATURDAY OVER THE
AREA.

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

.TODAY...

SKY/WEATHER.........SUNNY.
CWR.................0%.
MAX TEMPERATURE.....AROUND 73.
MIN HUMIDITY........29 PERCENT.
WIND (20 FT)........
 VALLEY/LWR SLOPES..TERRAIN DRIVEN TO 6 MPH.
 UPR SLOPES/RIDGES..SOUTHEAST WINDS 3 TO 9 MPH.
MIXING HEIGHT.......INCREASING TO 2900 FT AGL.
TRANSPORT WINDS.....EAST-SOUTHEAST AROUND 6 MPH.
HAINES INDEX....
    MID LEVEL.......6 OR HIGH.
    HIGH LEVEL......4 OR LOW.
LAL.................1.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0%.
MIN TEMPERATURE.....AROUND 53.
MAX HUMIDITY........50 PERCENT.
WIND (20 FT)........
 VALLEY/LWR SLOPES..DRAINAGE TO 4 MPH.
 UPR SLOPES/RIDGES..SOUTHEAST WINDS 6 TO 12 MPH.
MIXING HEIGHT.......2900 FT AGL DECREASING TO 300 FT AGL LATE IN
                    THE EVENING.
TRANSPORT WINDS.....LIGHT EAST WINDS.
HAINES INDEX........
    MID LEVEL.......5 OR MODERATE.
    HIGH LEVEL......5 OR MODERATE.
LAL.................1.

.FRIDAY...

SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0%.
MAX TEMPERATURE.....AROUND 71.
MIN HUMIDITY........36 PERCENT.
WIND (20 FT)........
 VALLEY/LWR SLOPES..TERRAIN DRIVEN TO 6 MPH.
 UPR SLOPES/RIDGES..SOUTHEAST WINDS 3 TO 9 MPH.
 SLOPE/VALLEY.......SOUTHEAST WINDS 7 TO 13 MPH.
MIXING HEIGHT.......300 FT AGL INCREASING TO 2100 FT AGL.
TRANSPORT WINDS.....LIGHT EAST WINDS.
HAINES INDEX........
    MID LEVEL.......5 OR MODERATE.
    HIGH LEVEL......5 OR MODERATE.
LAL.................1.

$$
FORECASTER...CERNIGLIA
REQUESTED BY...RUSSEL WILSTEAD
TYPE OF REQUEST...WILDFIRE
.TAG 20120920.SOUTH.01/SEW