CNRFC Hydrometeorological Discussion
Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
830 AM PDT Thu Sep 21 2023
...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS ALONG THE CASCADES
AND SIERRA AND EAST OVER NEVADA TODAY AND OVER NE NV FRIDAY...
...PRECIP OVER NW CA SAT NIGHT INTO SUNDAY SPREADING SOUTH AND EAST
OVER SRN OR AND NRN CA MONDAY AND SHOWERS POSSIBLE OVER NRN CA
TUESDAY...
.METEOROLOGICAL CONDITIONS (THU AM - WED AM)...
Low pressure centered over Eastern Oregon this morning with
associated trough over the region. The low weakens and wobbles
around to near the CA/OR/NV tonight then shifts east along the
OR/NV/ID border during the day Friday and east of the region by
Friday evening. Scattered showers and isolated thunderstorms over
Srn Oregon Cascades and along the Sierra and over NV today then
lingering showers possible over NE NV into Friday afternoon.
Drizzle/light rain (few hundredths or less) possible over Srn CA
this morning with a deepening marine layer and onshore flow with the
trough over the region.
The trough shifts to the east later Friday as weak ridge moves over
the area between systems bringing dry conditions Friday night into
the day Saturday. A weak disturbance moves through Srn CA Saturday
but not expected to bring any precipitation. Another trough digs
over the Eastern Pacific Saturday night into Sunday and the cold
front moves onto the west coast Monday. Light precipitation possible
along the NW CA coast Saturday night into Sunday then increasing and
spreading south and east across Srn OR and Nrn CA Sunday night into
Monday as cold front moves across the area. Showers possible on
Tuesday over Srn OR and Nrn CA, mainly along the NW Coast and over
the higher terrain. PW around 1.5 inches along Nrn CA coast Sunday
night into Monday and dropping south to off the Central Coast
Tuesday. Highest precipitation amounts expected over NW CA (around
Cape Mendocino and north) with 2-4 inches (highest for the Smith
Basin) and 1-3 inches over the Shasta Basin and around 0.5-1.5
inches for the Northern Sierra.
Max temperatures generally around 5 to 20 degrees below normal today
with the trough over the region. Max Temperatures near normal to 15
degrees below normal Friday and Saturday then cooling to 5 to 20
degrees below normal for Srn OR and Nrn CA Sunday into Tuesday. Low
temperatures generally near normal to 10 degree below normal warming
to near normal to 10 degrees above normal Sunday and Monday
mornings.
Please Note: This product may NOT be routinely updated Friday
through Sunday between Jun 1 and Oct 1. Please refer to
www.cnrfc.noaa.gov/dailyBriefing.php for a graphical summary of
weather and hydrologic conditions.
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