FNUS76 KSGX 221347 FWSSGX SPOT FORECAST FOR ANNUAL WILDLAND FIRE DRILL - DAY 3...UNLISTED NATIONAL WEATHER SERVICE SAN DIEGO CA 647 AM PDT WED APR 22 2009 FORECAST IS BASED ON IGNITION TIME OF 0900 PDT ON APRIL 22. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... A WEAK UPPER LEVEL LOW PRESSURE SYSTEM OVER AREA WITH MID LEVEL MOISTURE AND INSTABILITY ALOFT. IF A FIRE WAS OCCURING...PLUME DEVELOPMENT TO 32000 FEET WOULD BE POSSIBLE BY LATE MORNING. OTHERWISE EXPECT SOME ALTO CUMULUS CLOUDS TODAY. A COASTAL EDDY HAS DEVELOPED AND THE MARINE LAYER WILL BE DEEPENING TO 2000 FEET MSL...NEAR ALPINE...BY LATE THIS AFTERNOON. THIS WILL CAUSE LOWERING TEMPERATURES...INCREASING HUMIDITY...AND GUSTY WEST WINDS DURING THE AFTERNOON. FOR LATE TONIGHT THROUGH 0930 PDT THURSDAY...THE MARINE LAYER WILL BE DEEP ENOUGH TO CAUSE DENSE FOG AND LOW CLOUDS OVER AIR BASES AND MOST TRAVEL ROUTES BELOW 2500 FEET. .TODAY... SKY/WEATHER.........MOSTLY SUNNY. MAX TEMPERATURE.....AROUND 85. MIN HUMIDITY........20 PERCENT. WIND................ SLOPES...........WEST 4 TO 8 MPH WITH GUSTS 20 MPH LATE AFTERNOON. RIDGETOP.........WEST 10 TO 15 MPH. MIXING HEIGHT.......2000-3000 FT AGL. MIXING WINDS........SOUTHWEST 5 MPH...BECOMING WEST 10 TO 15 MPH. TIME (PDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM SKY (%).........12 12 13 13 13 13 13 13 15 WEATHER COV..... WEATHER TYPE.... TEMP............70 77 80 84 84 83 84 83 81 RH..............29 24 22 21 21 22 22 23 24 20 FT WIND DIR..W W NW NW NW W W W W 20 FT WIND SPD..4 4 8 8 8 8 8 8 8 20 FT WIND GUST.5 5 10 10 10 10 15 20 20 AIR OPERATIONS... UNTIL 1100 PDT...SCATTERED CLOUDS BELOW FL012 WEST OF EL CAJON, HIGHWAY 67/RAMONA...OTHERWISE SKY CLEAR BELOW FL120 AFTER 1700 PDT...SCATTERED-BROKEN CLOUDS BELOW FL020 WEST OF ALPINE, HIGHWAY 67/RAMONA. 0000-0900 PDT THURSDAY...OVERCAST CLOUDS BELOW FL025. VERY LOW IFR CONDITIONS AT RAMONA AIR BASE AND GILLESPIE FIELD AFTER 0930 PDT THURSDAY...SCATTERED-CLEAR WITH VISIBILITY 4 SM IN HAZE BELOW FL030. WINDS (KTS)...TEMP/DP (C) 8AM 11AM 2PM 5PM DIR/SP T/TD DIR/SP T/TD DIR/SP T/TD DIR/SP T/TD FL100 130/07 7/-11 150/06 07/-11 210/04 07/-11 290/07 06/-12 FL090 130/05 10/-09 165/04 10/-10 245/04 09/-10 295/11 09/-13 FL080 130/02 12/-10 220/02 12/-10 280/06 11/-12 300/13 11/-13 FL070 320/03 14/-11 290/04 14/-11 290/09 13/-12 295/15 12/-13 FL060 315/06 15/-11 300/07 15/-12 290/10 15/-12 295/15 13/-13 FL050 290/08 16/-10 295/07 16/-09 285/09 16/-08 280/15 13/-08 FL040 250/06 16/-03 265/07 17/-01 290/09 17/01 260/11 15/00 FL030 225/04 17/03 260/08 20/06 265/12 20/08 255/10 16/08 $$ FORECASTER...ROB BALFOUR REQUESTED BY...BC RON LAFF TYPE OF REQUEST...PRESCRIBED .TAG 20090422.ANNUA.01/SGX