FNUS76 KPDT 081753
FWSPDT

SPOT FORECAST FOR COTTONWOOD CREEK...USDA-MAF
NATIONAL WEATHER SERVICE PENDLETON OR
1053 AM PDT THU SEP 8 2011

FORECAST IS BASED ON IGNITION TIME OF 1050 PDT ON SEPTEMBER 08.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...HIGH PRESSURE WILL CONTINUE OVER THE REGION THROUGH
FRIDAY. MID-LEVEL MOISTURE AND LOW LEVEL INSTABILITY WILL RESULT IN
CUMULUS BUILDUPS, AND A THUNDERSTORM MAY BE POSSIBLE THIS AFTERNOON
OR EVENING. MAIN CONCERN WILL BE AN APPROACHING THERMAL TROUGH, VERY
DRY SURFACE HUMIDITIES, AND AN INCREASE IN VENTILATION THROUGH AT
LEAST FRIDAY. ALSO EXPECT CONTINUED POOR HUMIDITY RECOVERY AT NIGHT.
HAINES 5 CONDITIONS FROM STABILITY COMPONENT 3.

***THUNDERSTORMS IMPLY GUSTY AND ERRATIC WINDS***
***WINDS ARE 20 FOOT 10 MINUTE AVERAGES***
***CWR-CHANCE OF WETTING RAIN 0.10 OR GREATER***
***FORECAST IS VALID FOR 12 HOURS AFTER ISSUANCE***

.TODAY...

SKY/WEATHER.........PARTLY CLOUDY. ISOLATED SHOWERS. ISOLATED
                    THUNDERSTORMS IN THE AFTERNOON. LIMITED RAINFALL
                    REACHING THE GROUND.
CWR.................LESS THAN 10 PERCENT.
MAX TEMPERATURE.....86 TOP...88 BOTTOM.
MIN HUMIDITY........10-14 PERCENT.
WIND (20 FT)........UPSLOPE/UP VALLEY WINDS 3-6 MPH SHIFTING TO THE
                    NORTHWEST TO NORTH 4-8 MPH AFTER 1600.
RIDGETOP WIND.......NORTHWEST TO NORTH WINDS 5-8 MPH.
MIXING HEIGHT.......INCREASING TO 12500 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....VARIABLE 3-6 MPH BECOMING NORTHWEST TO NORTH
                    5-9 MPH DURING THE AFTERNOON.
LAL.................2.
HAINES INDEX........4 (LOW).

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY. ISOLATED SHOWERS AND
                    THUNDERSTORMS IN THE EVENING. LIMITED RAINFALL
                    REACHING THE GROUND.
CWR.................LESS THAN 10 PERCENT.
MIN TEMPERATURE.....56-59.
MAX HUMIDITY........40-45 PERCENT.
WIND (20 FT)........NORTHWEST TO NORTH WINDS 4-8 MPH IN THE EVENING
                    BECOMING DRAINAGE 2-5 MPH BY 2200.
RIDGETOP WIND.......NORTH WINDS 5-8 MPH SHIFTING TO NORTHEAST BY
                    MIDNIGHT.
MIXING HEIGHT.......12500 FT AGL DECREASING TO NEAR SURFACE AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....NORTH 6-9 MPH BECOMING LIGHT AND VARIABLE AFTER
                    MIDNIGHT.
LAL.................2.
HAINES INDEX........5 (MODERATE).

.FRIDAY...

SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0.
MAX TEMPERATURE.....88 TOP...90 BOTTOM.
MIN HUMIDITY........10-14 PERCENT.
WIND (20 FT)........DRAINAGE WINDS 2-5 MPH BECOMING UPSLOPE/UP VALLEY
                    3-7 MPH LATE IN THE MORNING...THEN SHIFTING TO
                    THE NORTH 6-11 MPH IN THE AFTERNOON.
RIDGETOP WIND.......NORTHEAST WINDS 7-12 MPH.
MIXING HEIGHT.......NEAR SURFACE INCREASING TO 8500 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....LIGHT WINDS BECOMING NORTHEAST 8-14 MPH IN THE
                    AFTERNOON.
LAL.................1.
HAINES INDEX........5 (MODERATE).

$$
FORECASTER...GKH
REQUESTED BY...PAM ARBOGAST
TYPE OF REQUEST...PRESCRIBED
.TAG 20110908.COTTO.01/PDT