area forecast discussion
national weather service sacramento ca
830 am pst thu apr 4 2002
marine layer has spread low clouds into the delta and out through
the valley and up into the foothills this morning. forecast was
updated to account for low clouds in srn lake county. thunderstorms
possible in the north and in the sierra and foothills this afternoon
with a very unstable atmosphere. bufkit sounding for rdd has lis
around -5 and cape around 1200 and pw 0.97 at 5 pm tonight. eta has
the peak cape around 1600 j/kg and pw around 0.5 inches north of
rdd. a weak short wave will also move through the area this
afternoon and evening to help kick off some thunderstorms. the weak
split system is still forecast to possibly bring a little light rain
to the area friday through friday night. most of the energy is to
the north and south and the dynamics are fairly weak with maximum
omega around -3 with the avn. pw are 0.5-0.75 inches on the avn and
the eta. ridge starts building and subsidence over the whole area by
saturday afternoon and should continue through monday afternoon.
then another trough approaches the area on tuesday morning to bring
a chance of rain tuesday and possibly lingering showers on
wednesday. mrf keeps zonal flow with several shortwaves moving
through for another chance of precipitation on thursday. hs
.sto...none.
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