It was just plain H-O-T for most of the county today. In fact, Downtown San Diego reached a high of 92°, making it the hottest day of the year.
We didn't reach record heat, but temps were well above average. Santee maxed out at 101° making it the 2nd hottest city in nation. The winner for hottest high was Anaheim at 103°.
We will get a break from this Santa Ana weather pattern by tomorrow. A trough of low pressure digging farther south over the Great Plains will generate cooler, onshore air flow. This will knock several degrees off our temps.
WEDNESDAY MICROCLIMATE HIGHS:
- Coastal highs near 81°, normal around 72°
- Inland highs near 90°, normal around 80°
- Mountain highs near 86°, normal around 68°
- Desert highs near 96°, normal around 87°
While temperatures will be cooler, they will still be warmer than usual.
The break will be short-lived. Surface level high pressure will build again over the Great Basin as the Pacific high off the West Coast nudges northeast. Offshore winds will pick up speed Wednesday night and will be strongest Thursday night / Friday morning.
Santa Ana conditions will bring critical fire concerns through the end of the work week.
A Red Flag Warning will be in effect from 5 AM Thursday until 5 PM Friday for the inland valleys, foothills and mountains. Expect sustained east northeast winds 25-35 mph with gusts to 50 mph. Isolated gusts to 60 mph are likely early Friday morning. Relative humidity values drop to 5-10%, with poor recovery overnight.
This offshore flow will also crank up the heat again, west of the mountains. There is a chance another heat advisory will be issued during this time frame.
A trough of low pressure will bring an end to warm and dry air for the coming weekend. Temperatures will drop around 10 degrees between Saturday and Sunday, continuing to cool through early next week.