Area Forecast Discussion
Issued by NWS San Diego, CA

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FXUS66 KSGX 262104

Area Forecast Discussion
National Weather Service San Diego CA
200 PM PDT Sat May 26 2018

A trough of low pressure over the Great Basin will slowly weaken
through the Memorial Day weekend with warmer days and a shallow
marine layer Sunday and Monday. The warm dry weather will continue
Tuesday and Wednesday before another trough brings back cooler
weather, a deeper marine layer, and gusty west winds in the
mountains and deserts Thursday and Friday.



Scattered light showers rolled across SoCal early this morning with
a few hundredths of an inch in the San Bernardino foothills and the
San Diego coastal and valley zones. The marine layer is
exceptionally deep today, around 6200 feet, deep enough to crest the
San Diego County mountains where Mt Laguna web cams showed low
clouds and fog this afternoon. The same goes for the San Bernardino
and Riverside County mountains where clouds and fog were still
banked up against the west and southwest facing mountain slopes at
1 PM.

The trof axis has passed east into Imperial County and post-frontal
subsidence is producing strong gusty winds in the mountains and
deserts. At 1 PM, Volcan Mountain had a wind gust to 47 mph. Blowing
Dust was reported in Imperial County, and can be seen on the visible
satellite loop this afternoon.

Broad cyclonic flow will continue tonight, and the marine layer will
remain fairly deep through Sunday morning. It will turn shallower
Sunday and Monday as higher pressure builds aloft. Sunday will be
warmer than today, and Monday will be warmer than Sunday. Fair
weather again Tuesday with high pressure aloft. On Wednesday we
start to transition back to a trough pattern with both the EC and
GFS in closer agreement with a stronger trough moving across SoCal.
Have trended a little lower with the long range max temps Thursday
and Friday.


262030Z..Coast/Valleys/Coastal Mountain Slopes...SCT low clouds will
continue this afternoon. Widespread Stratus will redevelop again
this evening after 02Z. Bases will be near 1500-2500 ft MSL with
around 3500 ft MSL tonight.

Mountain Crests/Desert Mountain Slopes/Deserts...Mostly clear to
partly cloudy with unrestricted vis through Sunday. West surface
winds 15-25 kt with gusts to 40 kt will produce isolated LLWS with
moderate up/downdrafts from the mountain crests to the desert
mountain slopes and through the passes through this evening. Blowing
dust and sand will also be a concern mainly in the lower deserts.


West-northwest winds occasionally gusting to around 20 kt are
expected near San Clemente Island this evening. Otherwise, no
hazardous marine weather is expected Sunday through Thursday.





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