FNUS76 KSEW 160743
FWSSEW

SPOT FORECAST FOR RICHERT ROAD...WASHINGTON DNR
NATIONAL WEATHER SERVICE SEATTLE WA
1243 AM PDT MON AUG 16 2010

FORECAST IS BASED ON REQUEST TIME OF 0008 PDT ON AUGUST 16.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE IN SEATTLE.

.DISCUSSION...THE AIR MASS OVER THE AREA IS HOT AND DRY...BUT LOW
LEVEL MARINE MOISTURE IS PUSHING INLAND UP THE LOWER CHEHALIS
VALLEY. AS OF MIDNIGHT THE LOW LEVEL STRATUS AND FOG WAS ALMOST TO
THE FIRE SITE...WITHIN 3-5 NM BASED ON SATELLITE IMAGERY. THE
STRATUS AND FOG SHOULD COVER THE FIRE SITE BY 2 AM WITH TEMPERATURES
DROPPING INTO THE LOWER TO MID 50S AND THE RELATIVE HUMIDITY REACHING
95-100% AND CONTINUING IN THIS RANGE UNTIL THE STRATUS BURNS
OFF. STRATUS  SHOULD BURN OFF BY AROUND 10 AM MONDAY MORNING. THE
HOT DRY AIR MASS ALOFT WILL TAKE OVER THE REST OF MONDAY...WITH
HIGH TEMPERATURES REACHING THE LOWER 90S LATE MONDAY AFTERNOON.
ONSHORE FLOW AND HIGHER PRESSURE TOWARD THE COAST SHOULD MAINTAIN
SW WINDS OF VARYING STRENGTH THROUGH THE DAY...WIND DETAILS BELOW.

BASED ON THE OBSERVATIONS TRANSMITTED WITH THE SPOT REQUEST...THIS
SITE SEEMS TO FIT CLOSELY TEMPERATURE-WISE WITH THE SHELTON
AIRPORT. THE HUMIDITY SEEMS LIKE IT WAS 2-4% HIGHER AT THE FIRE
SITE BASED ON THE OBSERVATIONS SUPPLIED.


THE FOLLOWING DISCUSSION IS FROM THE 321 PM SUNDAY FIRE WEATHER
PLANNING FORECAST...A THERMAL PRESSURE TROUGH WAS LOCATED FROM
CHEHALIS TO PORT ANGELES THIS AFTERNOON. THIS FEATURE IS
ACCOMPANIED BY A MID- LEVEL HAINES INDEX OF 6...INDICATING A VERY
DRY AND UNSTABLE AIR MASS BELOW 10 THOUSAND FEET MSL. THE THERMAL
PRESSURE TROUGH WILL REMAIN NEARLY STATIONARY THROUGH MONDAY
MORNING AND THEN SHIFT INLAND TO NEAR THE CASCADE CREST ON MONDAY
AFTERNOON. IT WILL EXIT INTO EASTERN WASHINGTON ON TUESDAY
MORNING. UNTIL THEN...A CRITICAL PERIOD FOR FIRE WEATHER WILL
CONTINUE.

ALONG THE COAST...MUCH COOLER AND STABLE MARINE AIR HAS SPREAD
ONTO THE BEACHES AND INTO THE CHEHALIS GAP. MORE SIGNIFICANT
COOLING IS EXPECTED AREAWIDE FROM TUESDAY THROUGH THE REST OF THE
WEEK AS ONSHORE FLOW STRENGTHENS AND AN UPPER TROUGH SETTLES OVER
THE AREA.

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

.TODAY...

SKY/WEATHER.........MORNING LOW CLOUDS AND FOG...BURNING OFF BY
                    AROUND 10 AM. SUNNY AND GETTING HOT THE REST
                    OF THE DAY.
CWR.................0%.
MAX TEMPERATURE.....AROUND 92.
MIN HUMIDITY........28 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 4-7 MPH EASING TO 1-3 MPH FROM
                    AROUND SUNRISE TO ABOUT 10 AM.
                    SOUTHWEST WIND RISING TO 4-7 MPH IN THE
                    AFTERNOON...POSSIBLY REACHING 7-11 MPH
                    EARLY IN THE EVENING.
 LWR SLP/VALLEY.....SITE APPEARS TO BE IN THE DRAINAGE FOR THE
                    SKOKOMISH RIVER. VALLEY WINDS SHOULD BE NEGLIGIBLE
                    AND WILL BE DOMINATED BY THE LARGER SCALE WINDS
                    LISTED ABOVE.
MIXING HEIGHT.......800 FT AGL INCREASING TO 6700 FT AGL LATE IN
                    THE MORNING.
TRANSPORT WINDS.....LIGHT WIND.
HAINES INDEX........5 OR MODERATE.
LAL.................1.

$$
FORECASTER...KAM
REQUESTED BY...DOREEN SMITH
TYPE OF REQUEST...WILDFIRE
.TAG 20100816.RICHE.01/SEW