Ation DISCUSSION,
.SHORT TERM (Today through Wednesday), The east-west axis of high pressure will remain across the area into Wednesday and Thursday. The warming trend will continue into the middle of the week with the peak of the heat for inland areas on Wednesday and Thursday.
Wednesday high temperatures will be near average at the coast to 5 to 10 degrees above average for the lower deserts. High temperatures on Wednesday will range from the lower to mid 70s near the coast to the 90s to 102 for the Inland Empire with 112 to 116 for the lower deserts. An Extreme Heat Warning has been issued for the lower deserts for Tuesday through Thursday. A Heat Advisory has been issued for the Inland Empire for Wednesday and Thursday.
The marine layer will continue to slowly decrease in depth through Wednesday and Thursday with night and morning coastal low clouds only spreading into the far western valleys for early Wednesday and early Thursday.
Very dry for the deserts into the mountains through Friday. The warming trend will continue for inland areas with the heat peaking on Wednesday and Thursday. There will be moderate to major HeatRisk for the lower deserts for Tuesday through Thursday. A few to around 5 degrees cooler for inland areas on Friday and Saturday, then slight warming with increasing humidity for Sunday through Tuesday of next week. The marine layer will keep coastal areas cooler with night and morning coastal low clouds spreading inland into portions of the western valleys at times.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
, UPDATED AVIATION DISCUSSION,
(today through Wednesday), The east-west axis of high pressure will remain across the area into Wednesday and Thursday. The warming trend will continue into the middle of the week with the peak of the heat for inland areas on Wednesday and Thursday.
Wednesday high temperatures will be near average at the coast to 5 to 10 degrees above average for the lower deserts. High temperatures on Wednesday will range from the lower to mid 70s near the coast to the 90s to 102 for the Inland Empire with 112 to 116 for the lower deserts. An Extreme Heat Warning has been issued for the lower deserts for Tuesday through Thursday. A Heat Advisory has been issued for the Inland Empire for Wednesday and Thursday.
The marine layer will continue to slowly decrease in depth through Wednesday and Thursday with night and morning coastal low clouds only spreading into the far western valleys for early Wednesday and early Thursday.
(Thursday through Sunday), High pressure aloft may weaken slightly on Friday, then restrengthen over the weekend. The center of the high will also begin to move to the northeast and be centered over the Great Basin on Saturday before expanding across the central Rockies into the northern and central Great Plains for early next week. As the high moves to the east, the flow across the area will become southeasterly by early next week opening the area to at least a gradual influx of monsoonal moisture by early next week.
NBM has Thursday as the hottest day for the lower deserts with cooling for inland areas on Friday and Saturday only a few to around 5 degrees. There is growing spread in the high temperature and low temperature guidance for inland areas for Sunday through Tuesday, mostly due to differences in the amount of moisture influx. Low temperatures will gradually warm for inland areas. High temperatures for the lower deserts may plateau around 110 to 112 while the inland valleys warm a few degrees.
061800z. Coast/Valleys, SKC with VFR conditions expected through this evening. Patchy low clouds based 800-1200 ft MSL return to coastal San Diego County starting 06-09z Tue. Low clouds slowly push into Orange County and increase in coverage early Tuesday morning, reaching 10-15 miles inland by 13z. Patchy minor vis reductions (1- 5SM) for elevated coastal terrain and western valleys. Low clouds scatter back to the coastline 15-17z.
Otherwise, VFR conditions expected through the end of the TAF period.
Gusts around 20 to 25 kts are expected at times this afternoon and evening near San Clemente Island. See the Small Craft Advisory for more details. Similar gusts near 20 kts are possible Tuesday afternoon. Otherwise, no hazardous marine conditions are expected through Saturday.
Ca, Heat Advisory from 10 AM Wednesday to 8 PM PDT Thursday for San Bernardino and Riverside County Valleys-The Inland Empire.
Extreme Heat Warning from 10 AM Tuesday to 8 PM PDT Thursday for Coachella Valley-San Diego County Deserts-San Gorgonio Pass near Banning.
PZ, Small Craft Advisory from 2 PM this afternoon to midnight PDT tonight for Waters from San Mateo Point to the Mexican Border Extending 10 to 60 nm out including San Clemente Island.
