FNUS76 KSTO 041639
FWSSTO

SPOT FORECAST FOR SIGNAL FIRE...SHASTA/TRINITY NF
NATIONAL WEATHER SERVICE SACRAMENTO CA
939 AM PDT THU JUL 4 2013

FORECAST IS BASED ON REQUEST TIME OF 0854 PDT ON JULY 04.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
ISOLATED THUNDERSTORMS AND SHOWERS ARE IN EASTERN SHASTA COUNTY
THIS MORNING, BUT SHOULD REMAIN EAST OF FIRE. MORE STABLE AIR WILL
STOP THUNDERSTORMS OVER AREA THIS AFTERNOON. THE NORTHERLY RIDGES
WINDS MAY BATTLE THE UPSLOPE FLOW BY LATE THIS MORNING AND INTO
AFTERNOON AND INTERMITTENT WIND SHIFTS...BUT WINDS NOT TOO STRONG.
EARLY THIS EVENING THE NORTH RIDGE WINDS WILL INCREASE FOR A FEW
HOURS BEFORE WEAKENING. EXPECT MORE SOUTHWEST FLOW TO INFLUENCE
THE FIRE FRIDAY AFTERNOON AS SOUTH WINDS MOVE UP THE SACRAMENTO
VALLEY.

.TODAY...

SKY/WEATHER.........MOSTLY CLOUDY THIS MORNING WITH ISOLATED SHOWERS
x09x09    AND THUNDERSTORMS STAYING EAST OF FIRE. THEN BECOMING
                    MOSTLY SUNNY IN THE AFTERNOON AS AREA BECOMES MORE
x09x09    STABLE.
MAX TEMPERATURE.....101-105...LITTLE CHANGE
MIN HUMIDITY........16-20 PERCENT...DOWN TREND 3-5 PERCENT.
WIND (20 FT)........
   SLOPE/VALLEY.....UPSLOPE 1 TO 3 MPH BECOMING SOUTH 2 TO 5 MPH.
   RIDGETOP.........NORTH 5 TO 8 MPH.
x09x09    INTERMITTENT NORTH RIDGE WINDS MAY MIX DOWN TO LOWER
x09x09    SLOPES AFTER AROUND 1100.
CWR.................10 PERCENT.
LAL.................2 TO SOUTHEAST OF FIRE THIS MORNING BECOMING 1 THIS
x09x09    AFTERNOON.
MIXING HEIGHT.......INCREASING TO 10500-10700 FT AGL.
MIXING WINDS........NORTH 8 MPH.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
MIN TEMPERATURE.....68-72.
MAX HUMIDITY........41-46 PERCENT.
WIND (20 FT)........
   SLOPE/VALLEY.....DOWNSLOPE TO NORTH WINDS 2 TO 4 MPH.
   RIDGETOP.........NORTH 8 TO 12 MPH WITH GUSTS TO 20 MPH AROUND 1800 TO
x09x09    2100...THEN WEAKENING TO 4 TO 8 MPH.
CWR.................0 PERCENT.
LAL.................1.
MIXING HEIGHT.......10700 FT AGL DECREASING TO LESS THAN 500 FT AGL.
MIXING WINDS........NORTH 6 TO 10 MPH.

.FRIDAY...

SKY/WEATHER.........MOSTLY SUNNY.
MAX TEMPERATURE.....92-96...DOWN 10 DEGREES.
MIN HUMIDITY........15-20 PERCENT...LITTLE CHANGE.
WIND (20 FT)........
   SLOPE/VALLEY.....UPSLOPE/UPCANYON 3 TO 5 MPH.
   RIDGETOP.........NORTH 6 TO 9 MPH WITH LOCAL GUSTS TO 15 MPH. THEN
x09x09    SHIFTING SOUTHWEST 4 TO 7 MPH AFTER 1400.
CWR.................0 PERCENT.
LAL.................1.
MIXING HEIGHT.......500-1100 FT AGL INCREASING TO 6200-6400 FT AGL.
MIXING WINDS........NORTH 6 TO 10 MPH SHIFTING SOUTHWEST AFTER 1400.


FORECASTER...JCLAPP
REQUESTED BY...ROBERT HOLT
REASON FOR REQUEST...WILDFIRE
.TAG 20130704.SIGNA.01/STO

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