The scene at 26th and Harrison, 5:00 pm today.

The cool air returned to San Francisco last night. When I took this picture this morning about 8:00 a.m., fog masked the skyline and Twin Peaks, but a ray of sun illuminated the inner Mission District. Taken from Bernal Heights.

Meanwhile, more than 100 fires were caused by lightning last night in counties north of the city, and inland areas still expect 100-degree temperatures, though cooling is expected to help firefighters in Napa and Solano counties.

Let’s see if it happens? Stay cool, and stay safe. This in from the Natl. Weather Service:

SAN FRANCISCO-SAN FRANCISCO BAY SHORELINE- SANTA CLARA VALLEY…INCLUDING SAN JOSE- 341 AM PDT TUE MAY 13 2008
…EXCESSIVE HEAT WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH THURSDAY EVENING FOR THE CITIES OF SAN FRANCISCO…OAKLAND AND SAN JOSE INCLUDING THE SANTA CLARA VALLEY…
A SIGNIFICANT HEAT EVENT IS FORECAST TO DEVELOP BY WEDNESDAY AFTERNOON WITH RECORD OR NEAR RECORD BREAKING HEAT POSSIBLE FOR THE URBAN AREAS OF THE GREATER SAN FRANCISCO BAY REGION. AFTERNOON HIGHS ON WEDNESDAY ARE FORECAST TO REACH THE MID 80S TO MID 90S AND THEN WARM TO THE UPPER 80S TO NEAR 103 ON THURSDAY WITH RECORD TEMPERATURES POSSIBLE. …………………… ALSO…NEVER LEAVE CHILDREN…ELDERLY OR PETS UNATTENDED IN ENCLOSED VEHICLES…EVEN FOR A SHORT TIME. TEMPERATURES QUICKLY RISE TO LIFE-THREATENING LEVELS EVEN WHEN THE WINDOWS ARE PARTIALLY OPENED.

Seriously people, don’t be complete schmucks and leave anything that can’t tolerate heat in the range of 150 degrees fahrenheit in your car. Better yet, don’t drive. Looks like the weather is going to be spectacular for a walk.