Hydrometeorological Discussion
Issued by NWS California-Nevada RFC

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AGUS76 KRSA 271736
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
930 AM PST Mon Feb 27 2017

...PRECIPITATION TODAY HEAVIEST OVER FAR SRN CA...

...NEXT SYSTEM OVER FAR NORTH ON SATURDAY...

.24 HOUR PRECIPITATION TOTALS (ENDING FEB 27 AT 400 AM PST)...

Scattered precip fell across the area with one exiting s/wv trof
across southern CA and another cool system arriving from the north.

For the higher terrain of northern CA...amounts generally ranged
from a few hundredths of an inch all the way up to 0.33-inch.
Localized totals along the immediate coast from Eureka northward
were in the range of 0.50- to 1.50-inches.

Across southern CA...amounts were in the range of a few hundredths
of an inch to 0.33-inch (greatest between southwest San Bernardino
county down through San Diego county).

For northeast NV...totals were in the range of a few hundredths of
an inch to 0.10-inch.


.METEOROLOGICAL CONDITIONS (SHORT TERM: MON AM - TUE PM)...

Showers across the region today with upper level trough over the
area and shortwaves moving through. Most of precipitation is over
the Smith Basin, the Sierra and over far Southern CA and increased
amounts over these areas. Moisture plume about an inch over far
southern CA with an upper level jet and shortwave moving through
will bring the heaviest precipitation over San Diego County and
Western Riverside mountains today.   Increased QPF amounts
considerably over San Diego and Riverside Counties with 2-4.5 inches
possible over the mountains and around an inch near the coast today.
Freezing levels around 3000 ft over the Sierra and around 7000 ft
over Southern CA Mountains. Precipitation will taper off overnight
as the trough shifts to the east. A few showers may linger over the
Smith and Upper Klamath Basins and Srn CA mountains and Northeast NV
Tuesday.

.METEOROLOGICAL CONDITIONS (LONG TERM: WED AM - SUN AM)...

Slightly anti-cyclonic flow will start the period across the
region...which will result in dry conditions lasting through early
Friday. As systems move toward the Pacific Northwest...the flow will
become a bit more zonal across the area and the moisture plume will
begin to sink south toward the CA/OR border. The GFS is a bit more
aggressive bringing the moisture across the region...while the EC
does hang it up a bit farther north. By Sat into early Sun...the EC
is more shallow with a s/wv trof moving toward the Pacific
Northwest...while the GFS digs the system off the coast a bit more.
For now...included light amounts over the higher terrain down to the
I-80 corridor with moderate amounts for the coast north of Cape
Mendocino...inland to to the Shasta Lake drainage...and over the
upper Klamath River basin.


.HYDROLOGICAL CONDITIONS...

The Upper Sacrametno River is slowly receding.  Recession is slower
than what would naturally occur due to sustained releases out of
Keswick.

The Lower San Joaquin is receding as well.  Reduction of flows
coming down the Tuolumne will help accelerate the recession rate at
Vernalis over the next couple of days.


More information on the CNRFC website at http://www.cnrfc.noaa.gov

DRK/HSO/DRK/SS

$$



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