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000 FXUS66 KHNX 031710 AFDHNX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA 910 AM PST TUE FEB 3 2009 .DISCUSSION...FOG ONCE AGAIN FORMED IN THE CENTER OF THE SAN JOAQUIN VALLEY EARLY THIS MORNING...BUT EXPECT IT TO CLEAR RAPIDLY BETWEEN 10 AND 11 AM GIVING WAY TO HAZY SUNSHINE. THE UPPER RIDGE OVER THE REGION WILL SLOWLY SHIFT INLAND TODAY AS AN UPPER LEVEL TROUGH NEAR 130W BEGINS TO MOVE TOWARD THE WEST COAST. THIS WILL BRING AN INCREASED SOUTHERLY FLOW ACROSS THE DISTRICT... WITH BREEZY CONDITIONS THROUGH THE KERN COUNTY MOUNTAIN PASSES AND GUSTY DOWNSLOPE WINDS AT THE FAR SOUTH END OF THE VALLEY NEAR THE BASE OF THE GRAPEVINE. THE SOUTHERLY WINDS WILL ALSO BRING HIGH TEMPERATURES WELL ABOVE NORMAL ACROSS THE CWFA...ESPECIALLY AT THE SOUTH END OF THE VALLEY WHERE THE RECORD HIGH WILL BE CHALLENGED AT BAKERSFIELD. FROM PREVIOUS DISCUSSION...THE SYSTEM WILL BEGIN TO PUSH ONSHORE LATE WEDNESDAY NIGHT...BRINGING SLIGHT CHANCES FOR PRECIPITATION TO PORTIONS OF THE DISTRICT. SHOWERS WILL THEN SPREAD OVER THE DISTRICT THURSDAY WITH THE INITIAL LOBE OF THE SYSTEM...CONTINUING THROUGH FRIDAY AS ADDITIONAL ENERGY PUSHES OVER THE REGION. CHANCES WILL LINGER INTO SATURDAY NIGHT OVER THE HIGHER ELEVATIONS AS THE TROUGH MOVES SLOWLY THROUGH...THEN DRYING SUNDAY AND MONDAY UNDER WEAK SHORTWAVE RIDGING BEHIND THE TROUGH. SNOW LEVELS WILL BEGIN RATHER HIGH...LOWERING TO AROUND 5000 FEET AS THE TROUGH MOVES IN. TEMPERATURES WILL LOWER TO SLIGHTLY BELOW CLIMO BY FRIDAY...THEN A SLIGHT WARMING FOR THE FIRST PART OF NEXT WEEK. && .AVIATION...IN THE CENTRAL AND SOUTH SAN JOAQUIN VALLEY...MVFR VISIBILITIES WITH AREAS OF IFR CONDITIONS IN FOG THROUGH 20Z TODAY. WHILE VFR CONDITIONS WILL PREVAIL OVER THE VALLEY AFTER 20Z...MVFR WITH AREAS OF IFR CONDITIONS WILL RETURN AFTER 06Z WEDNESDAY. ELSEWHERE ACROSS THE CENTRAL CALIFORNIA INTERIOR...VFR CONDITIONS WILL PREVAIL THROUGH 18Z WEDNESDAY. && .AIR QUALITY ISSUES... ON TUESDAY FEBRUARY 3 2009... UNHEALTHY FOR SENSITIVE GROUPS IN FRESNO... KERN... KINGS AND TULARE COUNTIES. FIREPLACE/WOOD STOVE BURNING IS PROHIBITED IN FRESNO... KERN... KINGS... MADERA... MERCED AND TULARE COUNTIES. FURTHER INFORMATION IS AVAILABLE AT VALLEYAIR.ORG && .HNX WATCHES/WARNINGS/ADVISORIES... NONE. && $$ PUBLIC...BEAN AVN/FW...MOLINA WEATHER.GOV/HANFORD