textproduct: San Diego

SYNOPSIS

Temperatures well above average in all areas expected into next week. High and low temperature records will likely be tied or broken every day through the next week. Heat this week will peak Thursday and Friday followed by a brief lowering of temperatures for the weekend before another increase next week which looks likely to peak mid-week. Widespread moderate HeatRisk for the valleys, inland coastal areas, and the lower deserts for Thursday and Friday of this week and for much of next week beginning on Monday. Heat related illnesses are likely for sensitive populations.

..MARINE AND AVIATION DISCUSSIONS UPDATED

Clear skies tonight. Temperatures this afternoon were generally higher than yesterday, by as much as 15-19 degrees in some inland areas. High temperature today were in the 60s at the coast, the 70s-80s in the inland valleys and high deserts, and in the 80 in the low deserts.

The upward trend in temperatures will continue into Friday with sunny skies under a building ridge of high pressure. Weak offshore flow on Thursday and Friday will also contribute to the higher temperatures. Temperature records will likely be equaled or broken as daytime temperatures reach the 80s-90s in the coastal areas and inland valleys, the 70s in the mountains above 3000 ft, the 80s in the high deserts and the upper 90s in the low deserts. The daytime high temperatures west of the mountains could be 20-25 degrees above seasonal averages.

A shortwave trough of low pressure moving inland to our north will weaken the ridge and bring a return of onshore flow. This will allow temperatures to lower somewhat on Saturday and Sunday, mainly west of the mountains. The lower deserts could see little or no change in temperatures.

For the first half of next week...the ridge will reestablish itself and amplify with a N-S ridge axis over CA, OR and WA. This has the potential to bring even higher daytime temperatures than on Thursday and Friday. There is still some spread in the model solutions but the National Blend of Models shows an 85-90 percent chance of exceeding 100 degrees in the low deserts on Monday and a 70-85 percent chance of exceeding 105 degrees in the low deserts on Tuesday.

AVIATION

120500Z...VFR conditions expected through the TAF period, with increasing clouds AOA 25k ft late Thu. Minimal chance (10-20%) for low clouds/FG at the immediate coastline 09-13Z. Otherwise, light offshore flow will very likely prevent any marine layer clouds from impacting any sites.

MARINE

Localized areas of fog are possible early Thursday morning, mostly in the outer coastal waters. Otherwise, no hazardous marine conditions are expected through Monday.

BEACHES

Long period southerly 2-3 ft swell at 19-21 seconds will create elevated surf along south and southwest-facing beaches through Thursday night. Surf heights peaking at 3-6 feet with sets to 7 feet.

SGX WATCHES/WARNINGS/ADVISORIES

CA...Heat Advisory from 10 AM Thursday to 8 PM PDT Friday for Orange County Coastal Areas-Orange County Inland Areas-San Bernardino and Riverside County Valleys-The Inland Empire- San Diego County Coastal Areas-San Diego County Valleys.

PZ...None.