Area Forecast Discussion
Issued by NWS San Diego, CA
FXUS66 KSGX 031737
Area Forecast Discussion
National Weather Service San Diego CA
930 AM PST Sat Dec 3 2016
Gusty Santa Ana conditions will continue far inland today and
will be most felt across Orange County and the Inland Empire. Warmer
with lighter winds through Sunday. Cooler with increasing clouds,
higher humidity, and onshore flow early next week. Offshore
winds and warming will follow for the latter half of the week.
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
wind gusts in excess of 55 mph were being reported this morning
over parts of the Inland Empire and the Santa Ana Mountains.
Elsewhere they had dropped off, and many areas had light and
variable winds and a chilly start to the morning.
A High wind Warning remains in effect for Orange County, and the
Inland Empire, with a wind advisory for the lower deserts
and the San Diego County Valleys. Some increase in winds should
develop through mid-morning, so no changes at this time.
Strong surface high pressure over the Great Basin will weaken
rapidly through Sunday as a cut-off, upper-level low pressure
center slips SE along the west coast of Mexico. This will relax the
pressure gradient across the southland and those areas that still
have wind today will see it drop off. After a sunny and warmer day
under a weak upper-level ridge on Sunday, a broad trough will
develop south across the Rockies and Great Plains. This will turn
flow back onshore with cooler weather and more clouds as the marine
By midweek, the surface flow turns back offshore as high pressure
rebuilds over the Great Basin and Rocky Mountains. This will bring
Fair and warmer weather through Friday.
031700Z...Clear skies and unrestricted vis will prevail through
Sunday. Areas of strong gusty northeast winds will continue today,
though less extensive than on Friday or Friday night, with winds
mostly over mountain crests and immediately to the southwest. Areas
of winds will be 20-30 knots with gusts to 50 knots in the San
Bernardino and Riverside County Mountains, far north and east parts
of the Inland Empire and in the Santa Ana Mountains and Foothills.
Local LLWS will occur along with strong up/downdrafts. Winds will
very slowly decrease this afternoon and tonight.
North-northeast winds have decreased over the coastal waters, and
wind speeds should be 20 knots or less the rest of today.
Strong north to northeast winds will continue through this
afternoon. Strongest winds will affect portions of the Inland
Empire below the Cajon Pass and the Santa Ana Mountains. Winds
20-40 mph with gusts of 50-70 mph are expected in these areas
through the morning, gradually weakening through the afternoon.
Winds in the San Diego and Riverside County mountains will
generally be around 25-35 MPH. In addition to the winds, widespread
daytime humidity in the upper single digits and low teens is
Red Flag Warnings remain in effect for Inland Orange County, the
Santa Ana mountains/foothills, the Inland Empire, and the San
Bernardino county mountains through 6 PM. Conditions will
improve on Sunday as offshore winds weaken.
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.
CA...High Wind Warning until 2 PM PST this afternoon for Orange
County Coastal Areas-Orange County Inland Areas-Riverside
County Mountains-San Bernardino County Mountains-San
Bernardino and Riverside County Valleys-The Inland Empire-
Santa Ana Mountains and Foothills.
Wind Advisory until 2 PM PST this afternoon for Coachella Valley-
San Diego County Deserts-San Diego County Mountains-San
Diego County Valleys-San Gorgonio Pass Near Banning.
Red Flag Warning until 6 PM PST this evening for Orange County
Inland Areas-San Bernardino County Mountains-Including The
Mountain Top And Front Country Ranger Districts Of The San
Bernardino National Forest-San Bernardino and Riverside
County Valleys -The Inland Empire.
Red Flag Warning until 3 AM PST Sunday for Santa Ana Mountains-
Including The Trabuco Ranger District of the Cleveland