Three more days of gorgeous weather, then Wednesday night, rain moves into the area. Thunderstorms possible on Thursday. This is what the NOAA forecast discussion had to say:
THINGS WILL FINALLY CHANGE ON WEDNESDAY AS A WELL-ADVERTISED LOW
OUT IN THE PACIFIC TAKES AIM ON OUR COAST. THIS LOW WILL START TO
TAKE SHAPE ON TUESDAY AS A CHUNK OF ENERGY BREAKS OFF FROM A TROUGH
AROUND 140W. BY WEDNESDAY THE LOW WILL BE JUST OFF THE COAST
SOMEWHERE BETWEEN OUR CWA AND THE LOX CWA. BOTH THE GFS AND ECMWF
THEN LIFT THE LOW TO THE NORTHEAST TOWARD SF BAY WHILE THE HIGHEST
PW VALUES ARE DIRECTED TO OUR SOUTHERN CWA AND POINTS TO THE SOUTH.
ANOTHER PIECE OF ENERGY WILL DROP DOWN FROM THE NORTH BEHIND THIS
FIRST LOW AND PROVIDE A REINFORCING SHOT OF MORE MOISTURE GOING INTO
THURSDAY NIGHT. THE MODELS CONTINUE TO DEPICT LIFTED VALUES DOWN AS
LOW AS MINUS 2 WHICH WOULD DEFINITELY TRANSLATE TO SOME
THUNDERSTORMS IN OUR AREA WITH THE MAIN FOCUS SOUTH OF SF BAY.
SHOWERS WILL START TO END FIRST IN THE NW AREAS FRIDAY EVENING AND
THEN TO THE SOUTHEASTERN CORNER OF OUR CWA SATURDAY MORNING.
MORE THAN TWO INCHES POSSIBLE FOR SPOTS IN THE LOS PADRES. AGAIN…
THIS IS STILL FIVE DAYS OUT AND THE MARGIN OF ERROR
FOR A QPF FORECAST THAT FAR OUT IS QUITE HIGH.
HOWEVER DUE TO GOOD AGREEMENT BETWEEN THE SOLUTIONS…LOW
SPREAD IN BOTH THE GFS AND ECMWF ENSEMBLES…AND GOOD RUN-TO-RUN
CONSISTENCY THERE IS ABOVE NORMAL CONFIDENCE FOR A FORECAST
OUT THAT FAR.
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