September 21, 2009 (San Diego) – The National Weather Service has issued a red flag warning cautioning Southern California residents of “explosive fire growth potential” due to a combination of strong winds and low humidity, which will be in effect from 9 a.m. Tuesday through 9 p.m. Thursday due to gusty winds and low humidity. The red flag warning includes inland, mountain and desert areas in San Diego's East County.
A strong high pressure system is predicted to strengthen, bringing dry weather, low humidity, and 15-25 mph winds through mountain passes with gusts up to 35 mph in wind-prone areas.
On Wednesday, strongest winds in Southern California are projected for Banning Pass and the foothills of San Diego County, with strongest winds in the mornings diminishing slightly in the afternoon and evenings. Winds will lighten by Thursday, but low single-digit humidity will continue. Friday through Sunday will remain very warm, though humidities are expected to rise slightly as weak onshore flow returns.
The National Weather Service has predicted triple-digit temperatures for inland areas, with record-breaking temperatures possible mid-week.
The Red Flag alert is also in effect for vast areas of other counties in Southern California. For a map, see http://www.wrh.noaa.gov/sgx/.
For more details, see http://forecast.weather.gov/wwamap/wwatxtget.php?cwa=sgx&/ wwa=red%20flag%20warning.