Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 021015
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
315 AM PDT Thu Oct 2 2014
Dry and warm weather expected through next week under prominent
high pressure ridge over the west coast. A slow warming trend
through the weekend then slightly cooler going in to next week.
Breezy north winds over ridges and northern Sacramento valley
this morning decreasing this afternoon.
Upper level high pressure ridge over the eastern Pacific is
forecast to amplify and move inland today. This will bring fair
skies and several degrees of warming most areas. Surface gradient
from MFR to SAC 7.8 mb this hour and this is translating to breezy
north winds over the northern Sacramento valley and surrounding
mountains. These winds should subside this afternoon with surface
gradients forecast to relax especially after 18z. The upper ridge
axis is forecast to remain near the coast Friday with the ridge
amplifying a bit more over the weekend. This will result in more
warming Friday and Saturday with daytime highs going into the
weekend reaching around 10 degrees above normal. Overnight lows
will likely come in just a little above normal under mainly fair
skies. Light northerly surface winds should keep conditions dry
with little threat of any significant overnight valley fog. The
dry conditions under the light northerly winds and subsidence
under the ridge will make for relatively low humidity. Daytime
humidity in the teens will be common with only poor to moderate
recovery overnight. Temperatures level off on Sunday with flat
surface gradients over California assuring mainly light winds.
.Extended Discussion (Monday through Thursday)
Upper ridge over the west coast weakens a bit early next week as
weather systems pass to the north. This will bring a slight
cooling trend on Monday through Thursday. A weak Pacific low
pressure system approaching the coast on Tuesday then moving
inland into SOCAL around the middle of next week will aid in the
slow cooling trend. This very weak low is not likely to have major
impacts on NORCAL weather next week other than the slight cooling
trend. By the end of next week, daytime highs are forecast to come
in just a bit above season normals. Weak surface high pressure
over the great basin will maintain a weak offshore flow over the
region for much of the time so significant nighttime valley fog
remains unlikely through the extended period.
Ridge of high pressure builds over interior Northern California
today bringing VFR conditions along with North to east winds.
North to East wind gusts up to 30 kts this morning in the
foothills and mountains.