-Low Elevation Snow-

NWS Hydrology Report

.HYDROLOGY…
FROM PREVIOUS DISCUSSION ON PRECIPITATION TIMING…LIGHT
PRECIPITATION MAY DEVELOP IN ADVANCE OF THE SYSTEM DURING THE DAY
TUESDAY…MAINLY OVER NORTHWEST AREAS. A PERIOD OF MODERATE
PRECIPITATION IS EXPECTED FOR MOST AREAS TUESDAY NIGHT WITH SHOWERS
LINGERING INTO WEDNESDAY. PERIODS OF HIGH INTENSITY PRECIPITATION
ARE POSSIBLE TUESDAY NIGHT AND EARLY WEDNESDAY.

CURRENT WATER EQUIVALENT QPF AMOUNTS ARE…
FOR ORANGE COUNTY/SW SAN BERNARDINO COUNTY…0.50 TO 1.00 INCHES AT
THE COAST TO 1.5 TO 2.5 INCHES ON THE COASTAL SLOPES…AND 0.50
INCHES HIGH DESERT VALLEY FLOORS.

FOR WESTERN RIVERSIDE/SAN DIEGO COUNTIES…0.50 TO 0.75 INCHES AT
THE COAST TO 1 TO 2 INCHES COASTAL SLOPES….AND 0.25 INCHES LOWER
DESERT VALLEY FLOORS.

REVISED SNOW FORECAST AMOUNTS…USING TEN TO ONE RATIO…
ABOVE 4500 FEET SAN GABRIEL/SAN BERNARDINO MOUNTAINS…12 TO 24 IN.
ABOVE 4500 FEET IN ORANGE/RIVERSIDE/SAN DIEGO COUNTIES…6 TO 12 IN.
ELEVATIONS 3500 TO 4500 FEET…2 TO 6 IN.
ELEVATIONS 2000 TO 3500 FT…TRACE TO 1 INCH.

HAIL ACCUMULATIONS WEDNESDAY COULD ADD ANOTHER INCH OR TWO AT LOWER
ELEVATIONS.

Snow on Lyons Peak which is only 3500 ft in Elevation
Date: January 22, 2010