Clouds ahead of the frontal zone that will be entering the forecast area in a couple days. No heavy rain is expected, however very light rain is possible, but not warrant a light rain icon overnight.

A hefty severe scenario unfolding today with enough low level shear and instability for showers and thunderstorms today. A chance of supercells as well with tornadoes. This area will be on the Northern side of the better tornado dynamics which exist further South in the state. Aviation : Tops of the thunderstorms 40k.

Rain West of Los Angeles will be light, however in this area, the sky should just be cloudy with no rain chances.

A weak front will make it's way into the area today with light showers around. No more than 0.10 inch is expected with this. This should not make it East of Los Angeles as the Mountains do get in the way of the flow this time, unlike last time.

Clear, windy, and very cold. Some frost in spots.

THURSDAY NIGHT - THE THIN MOISTURE COLUMM WILL KEEP ANY RAIN OUT OF THE COACHELLA VALLEY AND HIGHER DESERTS, INCLUDING THE BORREGO SPRINGS DESERT.

BY THURSDAY NIGHT, THE WEST FLOW BEHIND THE FRONT WILL BE MOIST IN THE SAN DIEGO COUNTY MOUNTAIN AREA, SO PRECIPITATION IS EXPECTED THERE. THIS FLOW WILL ALSO BRING THE ONLY CHANCE FOR SAN DIEGO TO SEE RAIN OUT OF THIS STORM. ANY RAIN THAT FALLS WITH THIS SYSTEM WILL FALL DURING THIS TIME THERE.

BY LATE THURSDAY NIGHT, THE FRONTAL ZONE SHOULD BE OUT OF THE AREA, LEAVING US WITH THE NORTHERN FLOW AND MOISTURE DYNAMICS TO WORK WITH. ONLY NORTHERN SECTIONS OF MOUNTAIN SLOPES WILL SEE THE PRECIPITATION AS I AM NOT EXPECTING ANY TO MOVE OVER AND SUSTAIN INTO THE SOUTHERN SLOPES. THE SNOW LEVEL WILL BE LOWEST OVER THE TEHACHAPI MOUNTAINS, INCLUDING BAKERSFIELD WHERE 1,000 FOOT SNOW LEVELS HAVE BEEN CALCULATED. THIS ACTUALLY MEANS THAT THE TOWN OF TEHACHAPI SHOULD BE SEEING SNOW AT THIS TIME. CALCULATION ARE FOR JUST 1/2" OF SNOW SO NOT MUCH, AND WOULD ONLY QUALIFY AS A DUSTING IN A FORECAST. HIGHER ELEVATIONS OF THE KERN COUNTY MOUNTAINS OVER 7,000 FEET WOULD SEE NEAR 2" OF SNOW. REALLY NOT MUCH, BUT ENOUGH TO GET THAT GROUND WHITE. BECAUSE OF THE FLOW, AND MOISTURE IN THE AREA, BAKERSFIELD IS EXPECTED TO REMAIN OUT OF THE PRECIPIATION.

LATE THURSDAY MORNING, THIS FRONTAL ZONE WILL ALREADY BE IN THE VANDENBERG AREAS DROPPING LIGHT RAIN. THE WEST FLOW IN THE LOWER LEVELS WILL FAVOR THE AREAS WEST OF THE MOUNTAINS AND FOOTHILLS FOR THE BEST RAINS. THIS DOES NOT LOOK LIKE IT WILL PRODUCE A LOT OF RAIN FOR SANTA BARBARA EITHER DUE TO THE WESTERN FLOW IN THOSE LOWER LEVELS. WEAK CONVERGENCE ZONE WILL BE THE STORY WITH THIS FRONTAL ZONE UNLIKE THE LAST ONE SO DON'T EXPECT MUCH. MODERATE CONVERGENCE ALONG THE FRONT OVER NORTHERN SAN LUIS OBISPO COUNTY WILL GIVE OVER 0.10 OF RAIN THERE WITH IT, WHICH WILL BE MORE THAN VANDENBERG. OROGRAPHICS WILL START WORKING INTO THE KERN COUNTY MOUNTAINS FOR LIGHT SHOWERS IN THE AREA AHEAD OF THE FRONT.

SPECIAL WEATHER STATEMENT ONTARIO WEATHER SERVICE ONTARIO CALIFORNIA DECEMBER 17 2007 - 2PM-PST FINAL FORECAST FOR TUESDAY - WEDNESDAY MORNING.BY TUESDAY EVENING, THE SNOW LEVEL WOULD RAISE AHEAD OF THE FRONTAL ZONE AS WARM, MOIST AIR MOVES IN, OTHERWISE KNOWN AS WARM AIR ADVECTION. THIS SHOULD UP THE SNOW LEVELS TO 8,500 FEET FOR THE TEHACHAPI, AND VENTURA COUNTY MOUNTAINS. THE SAN GABRIEL MOUNTAINS WOULD NOT BE IN MUCH OF THIS WARM AIR ADVECTION LIKE THE OTHER MOUNTAINS MENTIONED BEFORE-HAND, HOWEVER THE SNOW LEVEL WOULD SUSTAIN AT 7,500 FEET WITH 0-3 OF SNOW POSSIBLE. UP AT THE HIGHER PEAKS OF THE SAN GABRIELS, 4-6 OF SNOW IS POSSIBLE.8,000 FEET OVER THE SAN BERNARDINO COUNTY MOUNTAINS WOULD GIVE 0-3 OF SNOW POSSIBLE THERE, MOST LIKELY ON THE LOWER SIDE OF THAT SCALE FOR 8,000 FEET, AND THE PEAKS TOWARD THE UPPER SIDE.MOUNT SAN JACINTO WOULD BE GETTING THE 0-3 SCALE AS WELL AROUND THIS TIME.