CNRFC Hydrometeorological Discussion
Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
830 AM PDT Fri Sep 22 2023
...ISOLATED SHOWERS AND THUNDERSTORMS OVER NE NV TODAY...
...PRECIP OVER NW CA SUNDAY SPREADING SOUTH AND EAST OVER SRN OR AND
NRN CA MONDAY AND SHOWERS POSSIBLE OVER SRN OR AND FAR NRN CA
TUESDAY AND WEDNESDAY...
.METEOROLOGICAL CONDITIONS (FRI AM - THU AM)...
Low pressure centered near the border of CA/OR/ID this morning with
a few showers over NE NV. This system will continue to shift east of
the region by this evening ending the showers over NE NV. Meanwhile
a weak disturbance and some tropical moisture from the remnants of
tropical storm Kenneth (now post-tropical cyclone) are offshore of
Baja and streaming towards Srn CA. The moisture increases during the
day today with PW rising to around 1.25 inches this evening. Light
rain and sprinkles are possible over Srn CA today and into Srn NV
overnight. Saturday should generally be a dry day across the region
before the next system arrives.
A 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 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. PW around 1.5
inches along Nrn CA coast Monday and weakening and dropping south to
off the Bay Area Monday night. Highest precipitation amounts Sunday
and Monday expected over NW CA (around Cape Mendocino and north)
with 2-4 inches (highest for the Smith Basin) and 1-2.5 inches over
the Shasta Basin and around 0.5-1 inches for the Northern Sierra.
Another disturbance moves into the PAC NW late Tuesday into
Wednesday. About a 1.3 inch PW plume off the Nrn CA coast Tuesday
night into Wednesday morning. 06Z EC is farther north and weaker
with the system than the 06Z GFS late Tuesday into Wednesday. The
forecast leans to more of a southerly route with showers possible
over Srn OR and NW CA on Wednesday. Showers possible on Tuesday and
Wednesday over Srn OR and Nrn CA, mainly over Srn OR and along the
NW Coast and over the higher terrain. Precipitation totals for
Tuesday into Wednesday around 0.25-0.75 for the Smith Basin and Srn
Or Cascades and generally around a tenth of an inch or less for the
Shasta and Eel Basins.
Max Temperatures near normal to 15 degrees below normal today and
Saturday then cooling to 5 to 20 degrees below normal for Srn OR and
Nrn CA and generally near normal to 10 degree below elsewhere 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.
|