Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 280448
ZCZC SFOWRKAFD 000
TTAA00 KMTR 280339
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
945 PM PDT THU AUG 27 2015
DRY WEATHER WITH DAYTIME TEMPERATURES NEAR TO A LITTLE ABOVE
NORMAL FRIDAY. COOLER TEMPERATURES BEGINNING OVER THE WEEKEND
WITH A CHANCE OF SHOWERS OVER THE NORTHERN PORTION OF THE STATE
SATURDAY. DRY WITH A LITTLE BELOW NORMAL DAYTIME HIGH TEMPERATURES
CONTINUING THROUGH MOST OF NEXT WEEK.
Dominate high pressure from the 4-corners/Desert SW and a well mixed
out marine layer allowed for the hottest max temps this week over
most locations. Triple digit maxes were noted up/down the valley
from RDD-MOD and Wwd to SUU. Thus, today (Thu) will be the hottest
day as a cooling trend begins on Fri.
About 5-8 degrees of cooling is expected over most areas on Fri...
still about 1-6 degrees above normal. Clouds will increase and there
is likely to be at least a moderate late afternoon/evening delta
breeze as trough digs south off the coast. Moisture plume of
1.00-1.50 pwat will swing over extreme northern California Friday
night. Shower chances will be over the northern Sacramento
valley...north of Yuba City-Chico. Best chances for rain will be
Redding northward and have increased chances to likely.
Showers continuing into Saturday best chances northern valley
with trough swinging through the area. There will be slight
chances down to Sacramento during the morning...turning drier
late afternoon evening. Precipitation amounts may approach 0.25
inches north valley generally less than 0.10 inches elsewhere.
Temperatures will be much cooler with readings around 5 degrees
Drier and cool on Sunday with trough overhead. Onshore flow will
keep temps at least 5 degrees below average.
.EXTENDED DISCUSSION (Monday THROUGH Thursday)
Local area will remain under a large scale trough pattern into
mid-week. Expect dry conditions through Wednesday. Model
uncertainty remains towards the end of the week as another wave
moves onshore. This could bring another chance of precipitation
for the northern portion of the state. For now, have kept dry
forecasts until model differences can be resolved. High
temperatures will remain below normal through mid-week. IDM
VFR with SCT-BKN clouds AOA150 thru the period for TAF sites.
Generally light winds under 10 kts or less. Wind gusts 15 to 20 kts
through the Delta region tonight and again on Fri after 21Z.