Ation discussion for 00Z TAFs,
A ridge of high pressure is maintaining its position to our southwest, while a broad trough hangs over the Northern Pacific. The ridge will win out this time and strengthen over the region over the next few days. Subtle warming takes place in the deserts first on Saturday by a couple degrees. Further warming takes place on Sunday and Monday across all regions as the ridge of high pressure peaks in strength. This will bring inland regions 15 to 20 degrees above normal. Moderate heat risk is expected for the Inland Empire and high desert as high temperatures rise into the mid to upper 90s, with some spots near San Bernardino and Hemet reaching 100 degrees. Moderate to high heat risk is expected for those without adequate cooling or susceptible to the heat across the lower deserts, where an Extreme Heat Warning is now in effect. High temperatures will range from around 105 to near 110 in some spots, highest temperatures on Monday. Please take breaks and drink plenty of fluids if you are working outdoors.
With the strengthening ridge, the marine layer will become more suppressed each day. Low clouds that filled much of the coastal basin this morning will be more confined to the coast and valleys of San Diego and Orange Counties by Saturday and Sunday mornings. This will bring a greater chance of fog for these areas, especially Sunday into Monday.
Models are in good agreement of the high pushing eastward as an area of low pressure moves closer to the West Coast. This will bring greater onshore flow and cooling to the region. Model guidance does diverge on exactly where this area of low pressure goes. The closer this moves to the region will depend on how much we cool off next week. NBM shows temperatures near to slightly above average for the middle and end of next week with highs in the 70s and 80s for the mountains to the coast. Confidence is high that marine layer will build with more low cloud coverage each morning with continued dry weather.
A warming trend with a thinning marine layer will take hold through next Monday. Low clouds will stick closer to the coast and adjacent valleys through this period with temperatures peaking on Monday around 10 to 20 degrees above normal as the center of a ridge of high pressure moves over the region. A cooling trend with a deepening marine layer takes hold by the middle of next week as an area of low pressure nears the West Coast.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
, Updated aviation discussion for 00Z TAFs,
A ridge of high pressure is maintaining its position to our southwest, while a broad trough hangs over the Northern Pacific. The ridge will win out this time and strengthen over the region over the next few days. Subtle warming takes place in the deserts first on Saturday by a couple degrees. Further warming takes place on Sunday and Monday across all regions as the ridge of high pressure peaks in strength. This will bring inland regions 15 to 20 degrees above normal. Moderate heat risk is expected for the Inland Empire and high desert as high temperatures rise into the mid to upper 90s, with some spots near San Bernardino and Hemet reaching 100 degrees. Moderate to high heat risk is expected for those without adequate cooling or susceptible to the heat across the lower deserts, where an Extreme Heat Warning is now in effect. High temperatures will range from around 105 to near 110 in some spots, highest temperatures on Monday. Please take breaks and drink plenty of fluids if you are working outdoors.
With the strengthening ridge, the marine layer will become more suppressed each day. Low clouds that filled much of the coastal basin this morning will be more confined to the coast and valleys of San Diego and Orange Counties by Saturday and Sunday mornings. This will bring a greater chance of fog for these areas, especially Sunday into Monday.
Models are in good agreement of the high pushing eastward as an area of low pressure moves closer to the West Coast. This will bring greater onshore flow and cooling to the region. Model guidance does diverge on exactly where this area of low pressure goes. The closer this moves to the region will depend on how much we cool off next week. Nbm shows temperatures near to slightly above average for the middle and end of next week with highs in the 70s and 80s for the mountains to the coast. Confidence is high that marine layer will build with more low cloud coverage each morning with continued dry weather.
090000z, Coast, Low clouds 800-1200 ft MSL gathering along the immediate coast will move inland this evening, though there may be some fluctuating back and forth/intermittent scatter out through 03Z. Vis reduced 3-5SM along higher coastal terrain inland. Scatter out Saturday 16-18Z.
Valleys/Mountains/Deserts, Clear and VFR conditions through Saturday afternoon, except for patchy fog into southern and western corners of the Inland Empire 12-15Z Saturday, with a 40% chance for cigs at KONT after 11Z. Breezy westerly winds with gusts 25-35 kts through mountain gaps and desert slopes 22-06Z.
No hazardous marine conditions are expected through Tuesday.
Ca, Extreme Heat Warning from 10 AM Sunday to 8 PM PDT Monday for Coachella Valley-San Diego County Deserts-San Gorgonio Pass near Banning.
PZ, None.
