NGUS86 KRSA 131522
HCMRSA

Hydrometeorological Coordination Message
National Weather Service / California Nevada RFC / Sacramento CA
830 AM PDT Mon May 13 2024

...WARM TEMPERATURES INTO MID WEEK THEN SOME COOLING FOR 
THE WEEKEND...
...ISOLATED TO SCATTERED SHOWERS AND ISOLATED T-STORMS POSSIBLE 
MAINLY OVER CENTRAL AND SRN SIERRA AND INTO NV WITH THE BEST CHANCES 
IN THE AFTERNOONS/EVENINGS TODAY AND TUESDAY AND SATURDAY...

.METEOROLOGICAL CONDITIONS (MON AM - SUN AM)...

Shortwave trough moving through WA/OR and headed east into Idaho 
today with another wave dropping in the Pac NW tonight and a weak 
low offshore of the Central/Srn Ca coast and ridge of high pressure 
over the north eastern Pacific. This will bring Scattered showers 
and isolated thunderstorms mainly along the Central/Srn Sierra and 
over into NE NV. The pattern shifts to the east Tuesday with high 
pressure nosing into Nrn and Central CA and the weak low gets closer 
to the Srn CA coast. This will bring isolated to scattered showers 
and isolated thunderstorms mainly along the Central/Srn Sierra and 
east into Central/Srn NV. High pressure moves into most of the 
region on Wednesday as the weak low moves onshore over Nrn Baja. 
High pressure over the Eastern Pacific and into the region on 
Thursday with another low around 136W 30N. Mainly dry conditions 
expected on Wednesday and Thursday but there is a slight chance of 
showers/tstorms over the Srn Sierra Wednesday afternoon/evening. 
Ridge weakens on Friday as a shortwave trough moves into the Pac NW 
and low around 30N approaches 130W. Trough over NW US and low 
offshore of the Srn CA coast on Saturday. Although the details are 
still uncertain with various solutions of the strength and tracks 
and timing of the trough/lows but at least temps should be a little 
cooler next weekend. Isolated showers and thunderstorms are possible 
along the Sierra an into NV on Saturday. Freezing levels generally 
10000-14000 ft.

Max temperatures generally above normal up to 15 degrees over most 
of the region this afternoon except near normal to 10 degrees below 
normal along the CA coast. Temps warm up a little over Srn OR and 
into Central CA on Tuesday as high pressure builds in from the 
Eastern Pacific but about the same to a little cooler over Srn CA 
and most of NV with shortwave trough over Idaho and low offshore of 
Srn CA. Max temps rise to 5 to 20 degrees above normal on Wednesday 
except remain near to around 10 degrees below normal over the 
Central and Srn CA coast and generally a little warmer over most of 
the region on Thursday. Cooler temperatures over Srn OR and Nrn CA 
on Friday with max temps near normal to around 15 degrees above 
normal. More widespread cooling expected over the weekend with max 
temps near normal to 10 degrees above normal except near normal to 
15 degrees below normal along the coast. Overnight temps generally 
near normal to around 15 degrees above normal tonight into Saturday 
night. 


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

*********************** Contact Information ************************

CNRFC Office Hours Phone:     1 (916) 979-3056 Extension 338
After-Hours Calling Service:  1 (800) 218-0858
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Osborne

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