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Hydrometeorological Discussion
Issued by NWS California-Nevada RFC
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Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
830 AM PDT Thu Apr 25 2024

...COOL WITH PERIODS OF SHOWERS AND ISOLATED THUNDERSTORMS POSSIBLE,
ESPECIALLY OVER THE HIGHER TERRAIN THROUGH FRIDAY...

...MAINLY DRY AND WARMER OVER THE WEEKEND INTO TUESDAY...

.METEOROLOGICAL CONDITIONS (THU AM - WED AM)...

Upper level trough continues to move east into the four corners
region this morning as another shortwave trough and associated front
approach the Pac NW and Nrn Ca coast.  The trough deepens over the
region this afternoon into Friday. Two main areas of showers this
morning with one ahead of the front and shortwave trough along the
NW CA coast and into Srn Oregon and another group over North Central
NV. Also, a few showers over Srn Ca and Srn NV with light rain.
Showers will increase over Srn OR and Nrn CA (mainly along the coast
and higher terrain) and into NE NV during the day into tonight.
Precip amounts will be variable due to convective nature of showers.
Precip amounts generally around 0.75-1.25 over far NW CA coast and
west slope of the Srn OR Cascades and around 0.25-0.75 inches over
Nrn NV and 0.1-0.5 inches over the Nrn Sierra and generally a tenth
of inch or less along the CA coast and over Srn Sierra and Srn NV
and Srn Ca mountains. Precip amounts for Friday generally around a
quarter of an inch or less except locally to around a half an inch
mainly in the Nrn Mtns including the Srn OR Cascades and Ruby Mtns
and along the NW CA coast and along the Sierra. Precipitation
stretches south along the Sierra and into Srn NV and possible a few
showers over the transverse mtns and into San Diego County Mtns
Friday. The trough shifts to the east Friday night into the weekend
with weak ridging over the region and shortwaves to the north
approaching the B.C./ Pac NW coast. This will bring warmer and
mainly dry conditions to the region except some light precip
possible over the far NW CA coast and west slope of Srn OR Cascades
over the weekend. More of the ensemble members and deterministic
GFS and EC keeping the shortwaves farther north than yesterdays
runs. Although there are a few GFS and EC members (16% of total
members, 27% GFS and 16% EC) that show a deeper trough into the
northern part of the region starting Tuesday with others delaying
it into Wednesday or Thursday.

Max temperatures near normal to 15 degrees below normal across the
region this afternoon and similar Friday afternoon. Temperatures
warm up to near normal for most of the region except around 10
degrees below normal along NW CA coast Sunday afternoon and warming
to near normal to 10 degrees above normal over the region on
Tuesday. Overnight temperatures near normal to around 10 degrees
above normal tonight decrease to around normal Friday night then
warming to near normal to 10 degrees above normal Sunday night
and above normal up to 15 degrees Tuesday night.

Freezing levels around 5000-7000 ft over Nrn CA and 8000-10000 ft
for Central and Srn CA and NV this morning and around 4000-6000 ft
over Nrn CA and 6000-8000 ft elsewhere Friday and rising to around
6000-8000ft over Nrn CA and 8000 ft and higher elsewhere Saturday
and 4000-6000ft over far NW CA coast and Srn OR and 7000 ft and
higher for the rest of the region Sunday into Monday and rising to
8000 ft and higher across the region Tuesday.


QPF graphics are available at www.cnrfc.noaa.gov/qpf.php



Osborne

$$
National Weather Service Weather Forecast Office
