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Hydrologic Outlook
Valid: Nov 28 at 2:39PM PST
...FIRST FRONT HAS MOVED THROUGH...BUT EXPECT MORE SERIOUS HYDROLOGIC IMPACTS COMING SOON... AS OF 2:30 PM WEDNESDAY AFTERNOON, THE COLD FRONT HAS PUSHED THROUGH OUR AREA, LEAVING LIGHT TO MODERATE RAINFALL TOTALS ACROSS THE 11-COUNTY GREATER BAY AREA. MOST RAINFALL OCCURRED IN THE NORTH BAY AND MOUNTAINOUS AREAS--IN SOME LOCATIONS 2 TO 3 INCHES FELL EARLIER THIS MORNING, WHILE OTHER LOCATIONS ONLY RECEIVED ABOUT ONE THIRD INCH. THE LIGHTER THAN ANTICIPATED RAIN AND NOW CLEARING SKIES, ESPECIALLY IN THE SOUTHERN PORTION OF THE MONTEREY BAY AREA, IS DECEPTIVE AND NOT A SIGNAL TO LOWER YOUR GUARD. ALTHOUGH ONLY SCATTERED SHOWERS ARE EXPECTED OVER THE NEXT 24 HOURS OR SO, A MORE OMINOUS SYSTEM IS SCHEDULED TO ARRIVE THURSDAY NIGHT. RAIN WILL BEGIN IN THE NORTH BAY AND MOVE EAST AND SOUTH---SLOWLY. AS PRIOR FORECASTS INDICATE, VALLEY BOTTOMS MAY ONLY RECEIVE 1 TO 2 INCHES, BUT HIGHER TERRAIN MAY RECEIVE 3 TO 6 INCHES. A THIRD SYSTEM FOLLOWS, SLATED TO ARRIVE SATURDAY NIGHT. THIS SYSTEM IS PROJECTED TO BE EVEN WETTER --RAIN TOTALS THROUGH SUNDAY COULD BE ON THE ORDER OF A FOOT OR MORE IN COASTAL MOUNTAIN RANGES FROM SANTA CRUZ COUNTY NORTHWARD. THIS, COMBINED WITH ALREADY WELL SATURATED SOILS AND PRIMED CREEKS STILL RECEDING FROM THIS MORNING`S SYSTEM, COULD MEAN THAT FLOODING OF SMALL CREEKS AND STREAMS IS A POSSIBILITY FROM FRIDAY MOVING FORWARD THROUGH THE WEEKEND. MAIN STEM FORECAST POINTS OF INTEREST, SUCH AS THE NAPA, RUSSIAN, AND SAN LORENZO RIVERS ARE NOT EXPECTED TO REACH FLOOD STAGES. HOWEVER, THE RUSSIAN IS PREDICTED TO RISE TO A FEW FEET SHY OF MONITOR STAGE IN THE GUERNEVILLE AREA DURING THE LATTER HALF OF THE WEEKEND. SEASONED RIVER RATS AND LONG-TIME LOCAL RESIDENTS KNOW HOW FLASHY EVEN THESE LARGER SYSTEMS CAN BEHAVE, SO FOLLOW THEIR SAGE LEAD AND ERR ON THE SIDE OF CAUTION, EVEN AROUND THESE TYPICALLY MORE RESILIENT BIG BOYS. EXPECT ISSUANCE OF FLASH FLOOD WATCHES TOMORROW IN ANTICIPATION OF THE STORM THIS WEEKEND, PARTICULARLY FOR FLASHY CREEKS IN THE NORTH BAY AND SANTA CRUZ MOUNTAINS. FLASH FLOOD WARNINGS MAY FOLLOW DIRECTLY ON THE HEELS OF WATCHES AS THE STORMS RAMP UP OVER THE WEEKEND.