FNUS76 KSGX 171529
FWSSGX

SPOT FORECAST FOR SD COUNTY WILDLAND FIRE DRILL - APRIL 24...CNTY SD
NATIONAL WEATHER SERVICE SAN DIEGO CA
829 AM PDT SAT APR 17 2010

FORECAST IS BASED ON IGNITION TIME OF 0800 PDT ON APRIL 17.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...FOR SATURDAY APRIL 24 2010
HIGH PRESSURE RIDGE ALOFT IS CENTERED OFF THE WEST COAST AND THERMAL LOW
PRESSURE TROUGH IS OVER SOUTHEAST CALIFORNIA. THIS WEATHER PATTERN IS
FAVORABLE FOR THERMAL BELT DEVELOPMENT DURING THE NIGHT AND EARLY
MORNING HOURS...CAUSING VERY DRY AND WARM AIR BETWEEN 2700 AND
3700 FEET. STABLE CONDITIONS WITH COOL MOIST AIR WILL BE PRESENT IN
THE VALLEY UNTIL THE INVERSION BREAKS DURING THE LATE MORNING. WATCH
OUT FOR GUSTY WEST WINDS OVERPOWERING THE NORMAL UPSLOPE/UP VALLEY
WINDS FROM MID AFTERNOON INTO THE EVENING HOURS.

TODAY...
SKY/WEATHER.........MOSTLY SUNNY.
MAX TEMPERATURE.....72 VALLEYS TO 62 RIDGE TOPS.
MIN HUMIDITY........20-25 PERCENT.
WIND................
 MID SLOPES.........UPSLOPE 3 TO 5 MPH BECOMING WEST 10 MPH
                    IN THE AFTERNOON WITH GUSTS 20 MPH.
 UPR SLP/RIDGETOP...NORTHWEST 5 MPH IN THE MORNING...BECOMING
                    SOUTHWEST 5 TO 10 MPH IN THE AFTERNOON.
CWR.................0 PERCENT.
LAL.................1.
MIXING HEIGHT.......STRONG INVERSION NEAR 2700 FT MSL UNTIL 1100 PDT...
                    THEN MIXING TO 6000 FT MSL BETWEEN 1200-1700 PDT.
MIXING WINDS........WEST 4 MPH.

.OUTLOOK FOR THE REMAINDER OF THE DRILL...
A WEAK TROUGH EXPECTED TO MOVE ACROSS THE AREA ON TUESDAY.
HIGH PRESSURE TEMPORARILY REBUILDING ON WEDNESDAY.
STRONGER TROUGH MOVING ACROSS ARE ON THURSDAY.

.TUESDAY APRIL 27...
COOLER. PARTLY CLOUDY WITH MORNING FOG.
LOWS AROUND 47. MAX RH 100 PERCENT. HIGH AROUND 65. MIN RH 45 PERCENT.
WINDS WEST 10 MPH AND GUSTY.

.WEDNESDAY APRIL 28...
WARMER. MOSTLY SUNNY AFTER VALLEY MORNING FOG. LOW AROUND 44.
MAX RH 100 PERCENT. HIGH 74. MIN RH 25 PERCENT. WINDS UPSLOPE
3 TO 7 MPH BECOMING SOUTHWEST IN THE AFTERNOON.

.THURSDAY APRIL 29...
INCREASING CLOUDS. HIGH AROUND 66. MIN RH NEAR 50 PERCENT.
WINDS WEST TO SOUTHWEST 15 MPH WITH GUSTS 30 MPH.

$$
FORECASTER...ROB BALFOUR
REQUESTED BY...MIKE MURPHY
TYPE OF REQUEST...PRESCRIBED
.TAG 20100424.SDCOU.01/SGX