Area Forecast Discussion
Issued by NWS San Diego, CA
FXUS66 KSGX 312051
AREA FORECAST DISCUSSION
National Weather Service San Diego CA
151 PM PDT TUE MAY 31 2016
High temperatures will rise throughout the week as high pressure
builds aloft. Highs for inland areas could rise 10 to 20 deg F
above normal Friday and Saturday. A shallow marine layer will
maintain seasonal weather along the coast throughout the week. Low
pressure moving over the area early next week will create seasonal
weather across the region.
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
At 1 PM PDT, water vapor satellite imagery displayed an upper-
level low over northern Mexico, and an upper-level ridge over
northern and central CA. Visible satellite showed low clouds
along the coast 5 to 10 miles inland. A few areas along the coast
may see some sunshine by late this afternoon. 12 UTC model runs
are in overall good agreement with the overall pattern in the
next 7 days.
The aforementioned ridge will build over the region through the
end of the week, with H500 heights peaking around 594 DM
Saturday. H850 temperatures around 27 deg C will yield inland high
temperatures in the 100s F in the Inland Empire and High Desert
Thu-Sat, and highs between 110-115 deg F in the Coachella Valley
and SD County Deserts. Friday and Saturday look to be the warmest
days this week, with inland highs rising 10 to 20 deg F above
seasonal normals. A Heat Watch remains in effect for the areas
previously mentioned for Friday and Saturday. The only location at
this time that may break or tie a record high this week is Thermal on
Friday. The forecast is 113 F, and the record high is 113 F set in
1996. A shallow marine layer will keep high temperatures at
coastal locations near normal for this time of year.
Upper-level heights will quickly lower Sunday as an upper-level
low pushes the ridge to the east and moves over SW CA. This will
strengthen onshore flow, deepen the marine layer, and help high
temperatures return to seasonal normals around the region. No
precipitation is expected over the next week at this time.
312000Z...Coast/Valleys...This afternoon, sct/bkn low clouds will
affect areas along the coast and inland up to 5 miles, especially in
San Diego County. The best clearing will be along coastal Orange
County. Bases of these clouds 1000-1500 ft msl and tops 2400-2800 ft
msl. Besides a few passing high clouds this afternoon, skc conds
will persist inland. Between 01/0300-0600Z this evening, low clouds
with slightly lower bases and tops will once again push 10-15 miles
Mountains/Deserts...Mostly clear skies with unrestricted visibility
this afternoon through tonight. Normal diurnal breezes expected.
100 PM...No hazardous marine weather is expected through Saturday.
100 PM...A south swell will begin to build today, peak Wednesday and
Thursday, and diminish Friday. The long period of this swell will
help to produce bigger than average surf Wednesday and Thursday
particularly for south facing beaches. Strong rip and longshore
currents can be expected. For details, check the Beach Hazards
Statement (LAXCFWSGX) along with the surf forecast (LAXSRFSGX).
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.
CA...Excessive Heat Watch from Friday afternoon through Saturday
evening for Apple and Lucerne Valleys-Coachella Valley-San
Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Deserts-San Gorgonio Pass Near Banning.
Beach Hazards Statement from Wednesday morning through Thursday
evening for Orange County Coastal Areas-San Diego County