FNAK71 PAFC 301400
FWSAER

SPOT FORECAST FOR CHAKINA FIRE...NPS
NATIONAL WEATHER SERVICE ANCHORAGE AK
600 AM AKDT THU JUL 30 2009

FORECAST IS BASED ON REQUEST TIME OF 2156 AKDT ON JULY 29.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
A WAVE OF LOW PRESSURE WILL ADVANCE TOWARDS THE KENAI PENINSULA AND MATANUSKA
VALLEY THIS EVENING. TRACK OF THIS LOW IS FURTHER EAST THAN EXPECTED YESTERDAY.
A STRONG PRESSURE GRADIENT EXISTS WITH THIS FEATURE...WHERE SOUTHERLY WINDS 20 TO 35
MPH ARE EXPECTED OVER PORTIONS OF THE COPPER RIVER BASIN...PARTICULARLY ALONG THE
COPPER RIVER. RIDGING OVER THE ALCAN BORDER AND EASTERN COPPER BASIN WILL KEEP BULK
OF PRECIPITATION AND STRONGEST WINDS OVER THE WESTERN PART OF THE ZONE. HOWEVER...
WINDS DO LOOK TO BE STRONGER THAN INITIALLY THOUGHT...ESPECIALLY THIS EVENING
AND TONIGHT. ADDITIONAL CLOUD COVER WILL RETARD SURFACE HEATING TODAY...AND AS SUCH RELATIVE HUMIDI
TO BE HIGHER THAN PREVIOUS DAYS. A FEW PASSING SPRINKLES ARE POSSIBLE THROUGH
THE COURSE OF THE DAY...BUT WETTING RAIN IS NOT ANTICIPATED.

.TODAY...

SKY/WEATHER.........MOSTLY CLOUDY IN THE MORNING WITH A FEW PASSING SPRINKLES.
PARTLY CLOUDY IN THE AFTERNOON.
MAX TEMPERATURE.....AROUND 78.
MIN HUMIDITY........35 PERCENT.
WIND (20 FT)........LIGHT WINDS IN THE MORNING...BECOMING SOUTH 7 TO 10 MPH IN
THE AFTERNOON.
CWR.................0 PERCENT.
LAL.................1.
MIXING HEIGHT.......800 FT OR LESS IN THE MORNING...INCREASING TO 4500 FT IN THE
AFTERNOON.
MIXING WINDS........SOUTH 9 TO 12 MPH...BECOMING SOUTH 12 TO 18 MPH DURING THE AFTERNOON.

.TONIGHT...

SKY/WEATHER.........INCREASING CLOUDINESS. A FEW PASSING SPRINKLES.
MIN TEMPERATURE.....AROUND 58.
MAX HUMIDITY........RH 40 PERCENT DURING THE EARLY EVENING...RECOVERING TO 85 PERCENT.
WIND (20 FT)........SOUTH WIND 10 TO 15 MPH. GUSTS TO 20 MPH DEVELOPING LATE EVENING.
CWR.................0 PERCENT.
LAL.................1.
MIXING HEIGHT.......4500 FT IN THE EARLY EVENING...DECREASING TO 1000 FT.
MIXING WINDS........SOUTHEAST WIND 17 TO 27 MPH.

.FRIDAY...

SKY/WEATHER.........MOSTLY CLOUDY...BECOMING PARTLY CLOUDY IN THE AFTERNOON.
MAX TEMPERATURE.....72.
MIN HUMIDITY........37 TO 47 PERCENT.
WIND (20 FT)........SOUTH WIND 7 TO 11 MPH.
CWR.................0 PERCENT.
LAL.................1.
MIXING HEIGHT.......1000 FT DURING THE MORNING...INCREASING TO 4800 FT DURING THE
AFTERNOON.
MIXING WINDS........SOUTH 14 TO 24 MPH RUING THE MORNING...DECREASING TO 10 TO 15
MPH DURING THE AFTERNOON.

$$
FORECASTER...MALOY
REQUESTED BY...SCOTT BEACHAM
TYPE OF REQUEST...WILDFIRE
.TAG 20090729.CHAKI.01/AER