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AGUS76 KRSA 061426

HMDRSA



Hydrometeorological Discussion

National Weather Service / California Nevada RFC / Sacramento CA

730 AM PDT Mon May 6 2024



...SCATTERED SHOWERS AND ISOLATED T-STORMS ALONG THE NRN REGIONAL 

BORDER AS A DISTURBANCE MOVES THROUGH THE PACNW TODAY INTO TUES...

...WARMING TREND KICKS OFF TOMORROW WITH DRY CONDITIONS THEN 

EXPECTED THE REST OF THE PERIOD, TEMPS 5-10+ DEG F ABOVE NORMAL INTO 

THE WEEKEND...



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



Observations report another 0.50-1" or so over the northern/central 

Sierra over the past 24 hrs and scattered amounts across the rest of 

the region ranging from a few hundredths to over 0.50". The upper 

low that has been moving through over the weekend has opened into a 

trough and exited into WY/UT/CO. Weak ridging is attempting to build 

in over CA/NV as another trough arrives offshore of the PacNW. The 

trough will move through OR/WA today digging into the northern CA/NV 

borders potentially generating some showers and isolated 

thunderstorms. This system will enter ID into Tuesday as the 

currently exiting low re-strengthens over the north central US. The 

continued presence of troughing over the PacNW and nrn NV will keep 

showers going Tuesday morning along the northern CA/NV borders while 

high pressure building offshore keeps the rest of the region dry and 

kicks off some warming. Afternoon high temperatures expected to 

remain about 5-15 deg F below seasonal normals today.



Later Tuesday, the trough will merge with the low back east to form 

a larger system as high pressure continues to attempt to gain a 

foothold into the west coast. This pattern of low pressure to the 

northeast and high pressure to the west will persist mid-week 

keeping conditions dry and gradually rising temperatures from west 

to east. Into Thursday, the low will split in two with the western 

system retrograding back over the region pushing the ridge offshore. 

The low will remain centered around NV into the Four Corners the 

rest of the work week as the ridge sneaks around into the PacNW. By 

Friday afternoon, the low looks to move further away allowing high 

pressure to build into CA resulting in more widespread above normal 

temperatures by 5-10 deg F. Heading into the weekend, high pressure 

will continue to push into the west coast while the low retreats 

further away. The result will be above normal temperatures across 

the region by 5-15 deg F and mostly dry conditions.



All of the precip in the current forecast is expected today through 

Tuesday morning and should be confined to far northern CA/NV and srn 

OR. Highest amounts along the crest of the Cascades at 0.50-1" with 

0.10-0.50" over the Smith Basin and generally a few hundredths to a 

tenth of an inch or so elsewhere. No more precip expected after then 

aside from a stray shower or two late this week as the low backs 

into NV. The system moving through the PacNW today will keep 

freezing levels over the northern part of the region down to 5-7 kft 

with 8-13 kft for the rest of the region. Levels up north will lower 

further into Tuesday morning reaching a min of 3.5-7 kft before 

higher levels spread. most of CA is forecast to be at 8-12.5 kft 

from nw to se before the entire region rises above 10 kft later 

Friday.





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







AS



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