Monday, April 26, 2010

update on the latest storm

Disregard my post from earlier today. Things have changed. From the National Weather Service:

WET AND WINDY WEATHER LATE TONIGHT AND TUESDAY...

ANOTHER WINTER-LIKE PACIFIC STORM IS MOVING INTO THE NORTHWEST
COAST OF CALIFORNIA THIS AFTERNOON...AND WILL SPREAD
PRECIPITATION SOUTH AND EAST INTO THE NORTHERN INTERIOR LATE
TONIGHT AND ON TUESDAY. THIS SYSTEM MAY ALSO BRING STRONG AND
GUSTY SOUTH TO SOUTHWEST WINDS AT TIMES.

SUBTROPICAL MOISTURE FROM NEAR HAWAII IS FEEDING INTO THIS
SYSTEM...WITH A PLUME OF VERY MOIST AIR TAKING AIM AT NORTHERN
CALIFORNIA. THIS MOISTURE WILL COMBINE WITH UPPER LEVEL
SOUTHWESTERLY WINDS AND DYNAMICS TO ENHANCE THE OROGRAPHIC
PRECIPITATION EFFECT. MODERATE TO HEAVY PRECIPITATION WILL BE
POSSIBLE AT TIMES. SNOW LEVELS WILL INITIALLY START OUT RELATIVELY
HIGH WITH THIS SYSTEM...ABOVE 7000 FEET...THEN FALL TO BETWEEN 4500
AND 5500 FEET BY TUESDAY AFTERNOON. THIS MEANS THAT THE LOWER
ELEVATIONS WILL SEE RAIN TONIGHT AND TOMORROW. THE VALLEY COULD
SEE ANOTHER QUARTER TO NEAR AN INCH OF RAINFALL...WHILE FOOTHILLS
REGIONS COULD SEE BETWEEN ONE AND TWO AND A HALF INCHES BY LATE
TUESDAY EVENING. PORTIONS OF THE SOUTHERN CASCADES AND THE
NORTHERN SIERRA MAY SEE UP TO THREE OR FOUR INCHES OF RAIN
LOCALLY...DUE TO THESE ENHANCED OROGRAPHICS.

IN ADDITION TO THE RAIN AND HIGHER ELEVATIONS SNOW...STRONG WINDS
WILL ACCOMPANY THIS SYSTEM. PRESSURE GRADIENTS WILL INCREASE
AHEAD OF THE COLD FRONT LATE TONIGHT AND ON TUESDAY. IN THE VALLEY
AND SURROUNDING FOOTHILLS...SUSTAINED SOUTH TO SOUTHWESTERLY WINDS
MAY INCREASE TO THE 15 TO 30 MPH RANGE...WITH LOCAL GUSTS UP TO 40
MPH POSSIBLE. IN THE MOUNTAINS...WIND GUSTS UP TO 60 MPH MAY BE
POSSIBLE ON TUESDAY. THE COMBINATION OF WIND AND SNOW COULD BRING
WHITE OUT CONDITIONS AT TIMES OVER THE HIGHER MOUNTAIN PASSES OF
THE SIERRA NEVADA ON TUESDAY.

THOSE WITH OUTDOOR ACTIVITIES PLANNED FROM LATE TONIGHT TO TUESDAY
SHOULD BE PREPARED FOR INCLEMENT WEATHER. IF PLANNING TO TRAVEL IN
THE MOUNTAINS...BE SURE TO CARRY TIRE CHAINS AND CHECK THE LATEST
ROAD AND WEATHER REPORTS BEFORE DEPARTURE.

This storm looks like a soaker. With such heavy rain falling in a relatively short amount of time, localized flooding may result. I'm not saying flooding is imminent, but just be prepared. By Wednesday, just a few showers linger, but the high temperature will be chilly- upper 50s to lower 60s. Thursday will be mainly dry and slightly warmer, but temps will still remain in the 60s. There will be a slight chance of a shower on Friday, while Saturday and Sunday look dry and warm. Temps will range from the lower 70s Friday to the upper 70s/ lower 80s Saturday and Sunday. At least we can look forward to nice weather this weekend!

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