FXUS66 KMTR 062239
AFDMTR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
239 PM PST FRI DEC 6 2013
.DISCUSSION…AS OF 02:30 PM PST FRIDAY…
HIGH CLOUDS ARE STREAMING INTO THE AREA AHEAD OF A SHORTWAVE
CURRENTLY CENTERED OFF THE OREGON COAST. PRECIPITATION IS STILL
MOSTLY CONFINED TO FAR NORTHERN CALIFORNIA HOWEVER SNOW IS
CURRENTLY FALLING IN MENDOCINO COUNTY WHERE COLD AIR IS TRAPPED.
RAIN IS FORECAST TO BEGIN ACROSS THE NORTH BAY LATER THIS
AFTERNOON AND SPREAD ACROSS THE REST OF THE AREA OVERNIGHT.
RAINFALL ACCUMULATION WILL RANGE FROM A TENTH TO A QUARTER OF AN
INCH AROUND THE URBAN BAY AREA WITH AROUND A HALF INCH AT HIGHER
ELEVATIONS.
SNOW LEVELS WILL INITIALLY BE AROUND 2500 TO 3000 FEET ACROSS
MOST OF THE AREA AS THE PRECIPITATION BEGINS…DROPPING TO AS LOW
AS 2000 FEET AFTER THE FRONT PASSES. SNOW ACCUMULATION OF TWO TO
FOUR INCHES IS POSSIBLE ABOVE 2500 FEET. SNOW LEVELS ARE SLIGHTLY
LOWER OVER THE NORTH BAY HOWEVER ACCUMULATIONS ARE EXPECTED TO BE
LIGHT. MODELS ARE INDICATING SHOWERS WILL LINGER OVER MONTEREY AND
SAN BENITO COUNTIES INTO MID SUNDAY MORNING WHEN COLDER AIR
ARRIVES WHICH COULD INCREASE ACCUMULATIONS UP TO AROUND SIX
INCHES OF SNOW. TRAVEL IN AREAS WITH SNOW OR RAIN SNOW MIX COULD
BECOME DIFFICULT.
OVERNIGHT LOW TEMPERATURES TONIGHT WILL BE MUCH WARMER THAN THOSE
OF THE PAST FEW NIGHTS. AS THE SKIES CLEAR IN THE NORTH BAY BEFORE
SUNRISE SATURDAY MORNING HOWEVER TEMPERATURES COULD END UP
PLUMMETING. HAVE GONE WITH A MIDDLE SOLUTION OF SOME COOLING OVER
SONOMA AND NAPA BUT IT COULD END UP BEING EVEN COLDER IN ISOLATED
VALLEYS IF THE CLOUDS ARE FAST TO CLEAR AND WINDS REMAIN LIGHT.
VERY COLD AIR WILL RETURN POST FRONT LEADING TO AT LEAST TWO MORE
MORNINGS BELOW FREEZING IN MANY AREAS. FREEZE WARNING HAS BEEN
ISSUED FOR MOST OF THE AREA FOR SUNDAY MORNING. TEMPERATURES
SLOWLY REBOUND AROUND THE MIDDLE OF NEXT WEEK AS A RIDGE BUILDS
ACROSS THE WEST. IT IS QUICK TO PROGRESS INLAND HOWEVER LEADING TO
A CHANCE OF RAIN LATE IN THE WEEK AS A LONG WAVE TROUGH MOVES
&&
.MTR WATCHES/WARNINGS/ADVISORIES…
.TNGT…WINTER WEATHER ADVISORY…SANTA CRUZ MOUNTAINS
…EAST BAY HILLS…AND SANTA LUCIA MOUNTAINS