FNUS76 KSGX 162059
FWSSGX

SPOT FORECAST FOR S390 FIELD EXERCISE 4 - BREAKDOWN OF HIGH PRESSURE RIDGE...CNTY ORNG
NATIONAL WEATHER SERVICE SAN DIEGO CA
1259 PM PST WED FEB 16 2011

FORECAST IS BASED ON A HYPOTHETICAL WEATHER SCENARIO. IT DOES NOT
REPRESENT ACTUAL CONDITIONS. IT IS ONLY TO BE USED FOR THE S390
FIELD EXERCISE BEING HOSTED BY ORANGE COUNTY FIRE AUTHORITY.

CONTACT DONAL BOURSIER FC ORC FS15-8 FOR FURTHER INFORMATION.

.DISCUSSION...TEST...TEST...TEST...
STRONG HIGH PRESSURE RIDGE OVER CALIFORNIA WILL BREAKDOWN
AS TROUGH MOVES TOWARD WEST COAST. GENERAL WINDS HAVE BEEN LIGHT
AND VARIABLE BUT SHOULD BECOME SOUTHWEST. THIS SHOULD CAUSE AN
INCREASE IN THE UP CANYON WINDS THIS AFTERNOON AND EVENING.
NO SIGNIFICANT COOLING OR MOISTENING OF THE AIR MASS IS EXPECTED
UNTIL TOMORROW.

.TODAY FOR S390 FIELD EXERCISE...

SKY/WEATHER.........SUNNY MORNING...VARIABLE HIGH CLOUDS DURING THE
                    AFTERNOON.
MAX TEMPERATURE.....AROUND 90.
MIN HUMIDITY........5 PERCENT.
WIND................
   SLOPES...........UPSLOPE 3 TO 8 MPH THROUGH MID AFTERNOON...BECOMING
                    WEST 10 MPH WITH GUSTS 30 MPH DURING THE LATE
                    AFTERNOON AND EVENING.
   RIDGETOP.........SOUTHEAST 5 MPH BECOMING SOUTHWEST 20 MPH DURING THE
                    AFTERNOON.
MIXING HEIGHT.......10000 FT AGL.
MIXING WINDS........SOUTH 3 MPH BECOMING SOUTHWEST 15 MPH IN THE
                    AFTERNOON.

.TONIGHT FOR S390 FIELD EXERCISE...

SKY/WEATHER.........INCREASING CLOUDS.
MIN TEMPERATURE.....LOW 65.
MAX HUMIDITY........40 PERCENT.
WIND................
   SLOPES...........WEST 10 MPH WITH GUSTS 30 MPH UNTIL 1900 PST...
                    THEN DOWNSLOPE/DOWN CANYON 3 TO 6 MPH.
   RIDGETOP.........SOUTHWEST 20 MPH WITH GUSTS 30 MPH.
MIXING HEIGHT.......4000 FT AGL LOWERING TO 1000 FT AGL AFTER 2000 PST.
MIXING WINDS........SOUTHWEST 20 MPH.

.TOMORROW FOR S390 FIELD EXERCISE...

SKY/WEATHER.........PARTLY CLOUDY.
MAX TEMPERATURE.....AROUND 80...DOWN TEN.
MIN HUMIDITY........25 PERCENT...UP TWENTY.
WIND................
   SLOPES...........UPSLOPE 3 TO 5 MPH IN THE MORNING...BECOMING
                    WEST 12 MPH WITH GUSTS 25 MPH UP CANYON BY EARLY
                    AFTERNOON.
   RIDGETOP.........SOUTHWEST 25 MPH.
MIXING HEIGHT.......3500 FT AGL.
MIXING WINDS........SOUTHWEST 20 MPH.


TEST...TEST...TEST

$$
FORECASTER...ROB BALFOUR
REQUESTED BY...DONAL BOURSEIR
TYPE OF REQUEST...TEST
.TAG 20110218.S390F.04/SGX