Detailed Forecast
Today
A chance of showers and thunderstorms, mainly after 2pm. Partly sunny early, then becoming sunny, with a high near 105. West wind 5 to 10 mph becoming south in the afternoon. Chance of precipitation is 30%.
Still a chance today for some more.
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.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
Today through Friday...
High pressure over the southwest states will gradually weaken and
shift its position. The center of the high pressure will move
southward into Arizona with a large trough of low pressure to the
northwest over the northeast Pacific, and Hurricane Genevieve to
the south off the coast of southern Baja.
Very hot daytime temperatures will continue through Thursday
except for the coast and the higher elevations in the mountains,
although today and Thursday will not be quite as hot as yesterday
west of the mountains. Temperatures will continue to be 10-15
degrees above seasonal averages and daily records will likely be
broken.
Scattered thunderstorms are expected once again today, mainly
for the mountains and high desert areas, with initial development
in the higher mountains in the late morning. The sea breeze
convergence boundary will be farther inland in the Riverside and
San Diego County mountains, to the east of the ridge tops versus
closer to the coastal foothills as was the case yesterday. This
will reduce chances for thunderstorms developing in the mountains
to move into adjacent portions of the inland valleys.
Rainfall yesterday near storm cores ranged from around one half
inch to around 1.35 inch. Storm movement will continue to be a
limiting factor for greater rainfall totals, but brief heavy
downpours are expected with isolated flash flooding possible.
Lightning, strong gusty winds and small hail are likely to
accompany storms.
Coverage of thunderstorms is expected to be much less on Thursday
afternoon and mainly along the east slopes of the mountains,
possibly into the San Diego County deserts and the Coachella
Valley. Thunderstorms are expected in similar areas for Friday
afternoon, but possibly with slightly greater coverage.
Patchy low clouds and fog over the coastal waters and along some
beaches will continue, mainly during the nights and mornings due
to the presence of a very shallow marine layer.
Saturday through Tuesday...
Some influx of moisture from the south is expected for Friday
into the weekend with high temperatures falling below 110 over the
weekend for the lower deserts. Most areas will be not quite as
hot for the weekend into early next week, but with high
temperatures remaining 5-10 degrees above seasonal averages in
some areas. A slight chance of thunderstorms may continue each
afternoon, mainly for the mountains into the high desert.
&&
