, which brought damaging winds and very dry conditions to portions of Southern California. Some places along the coast also saw dense fog.
Every event with a place to put it; 7 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS SGX wrote it up.
A mid-level area of low pressure swung its way across the southwestern U.S., which brought damaging winds and very dry conditions to portions of Southern California. Some places along the coast also saw dense fog.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Diego, CA wrote its last area forecast discussion before the first event at Nov 22, 1:39 PM PST, 6 hours 21 minutes earlier.
Area Forecast Discussion National Weather Service San Diego CA 139 PM PST Sun Nov 22 2020 .SYNOPSIS... Look for lowering temperatures through Monday along with a few coastal low clouds during overnight/morning hours. Slightly warmer Tuesday courtesy of weak offshore flow, but we'll return to cooler weather by Thanksgiving. Moderate Santa Ana winds could develop as early as Thursday afternoon, and are slated to peak in strength Friday, with offshore winds persisting into Saturday locally. Cold air with surface high pressure over the Great Basin will keep the deserts and mountains cooler to start the weekend. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... A few low clouds and patchy fog continue to straddle sections of the California Bight this afternoon, with a few beaches shrouded in dense fog. Low clouds will become more widespread again this evening, with some patchy dense fog possible for coastal locations early tonight before the marine layer deepens, spreading clouds farther inland into the western valleys. Monday will be several degrees cooler as a result of a passing trough, with locally breezy west winds affecting most passes and desert slopes. As the trough exits to the east, a brief period of weak northeast winds will develop inland Tuesday, contributing to a slight rise in temperatures and a more restricted marine layer. Tuesday's warming will be short-lived, with a cooling trend making a quick return through Thanksgiving as another shortwave trough digs south through the Intermountain West. Latest guidance evaporates any previous chances for drizzle or light precipitation Thursday, but it should nonetheless be a rather chilly Thanksgiving (by SoCal standards, at least). Highs will stick in the 60's west of the mountains, with lows dipping into the high teens that night for high-elevation mountain communities such as Big Bear. As the shortwave progresses east, north winds aloft will combine with cold air and high pressure settling into the Great Basin to generate our next round of Santa Ana winds, starting as early as Thursday afternoon for northern portions of our forecast area. Guidance has trended stronger with winds over the past 24 hours, including the EC ensemble mean and our local extended WRF, resulting in increasing confidence of a moderately strong Santa Ana event. If it materializes, it would bring locally critical fire weather conditions to passes, foothills and most valleys. Northeast winds look to peak Friday for most areas, with maximum gusts on the order of 40-50 mph in traditionally windy locations. Minimum daytime humidities will dip into the teens away from the coast. Offshore winds will persist into Saturday, likely weakening some for all but San Diego County, where easterly winds could see little change relative to Friday. Very dry inland conditions, along with gradual warming and periods of weak offshore flow may persist beyond Saturday as we head into early December, with no rain in sight. && .AVIATION... 222135Z...Coast and Valleys...Areas of fog and low clouds reforming near the coast this evening with CIGS starting out between 200-500 feet, then deepening to 500-900 feet after 08Z as the marine layer deepens. The low clouds will spread 10-15 miles inland through 15Z Monday, perhaps reaching as far inland as KONT. Visibility will be variable, ranging from 1/2 to 5 miles through 15Z. CIGS will lift to 010-020 from 15Z-20Z, with vis improving to 3- 6 miles in haze. After 21Z...SCT020-025. Mountains and Deserts...SCT-BKN250 tonight and Monday today with VFR conditions. && .MARINE... Pockets of fog reforming over the coastal waters again tonight, locally dense with visibility less than 1 mile at times. But visibilities are forecast to improve above 1 mile later tonight through Monday morning as a weak Catalina Eddy spins up and slowly deepens the marine layer. && .FIRE WEATHER... Locally elevated fire weather conditions are anticipated across portions of the Inland Empire and adjacent mountain slopes Tuesday as weak offshore winds make a brief appearance. Otherwise, there are no fire weather concerns until Thanksgiving Day. Beginning as early as Thursday afternoon, moderate Santa Ana winds will develop below Cajon Pass, across portions of the Inland Empire and into the foothills of the Santa Ana mountains, spreading north to south into the San Diego County foothills by Friday morning and resulting in locally critical fire weather conditions. Winds are expected to peak Friday, when maximum gusts between 40 and 50 mph are likely for wind-prone areas. Strongest winds will likely occur in the vicinity of Cajon Pass and adjacent Inland Empire zones. Relative humidity will fall correspondingly starting Thursday, with a sharper drop into the teens on Friday for inland areas. Offshore northeast/east winds will continue into Saturday, when they'll likely be focused over San Diego County with peak gusts to 35 or 40 mph. Minimum daytime humidities will remain critically low all weekend, with weak offshore winds persisting locally as well. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...NONE. PZ...NONE. && PUBLIC/FIRE WEATHER...Rodriguez AVIATION/MARINE...Moede
The national radar mosaic for the moment the first event began.
4 high wind, 2 dense fog, 1 wildfire. Local standard time, as filed.
Portions of the San Diego County coast saw periods of dense fog. San Diego Airport ASOS observed periods of dense fog as low as 1/8 of a mile.
Portions of the Orange County coast saw periods of dense fog. John Wayne Airport ASOS reports dense fog with visibility as low as 1/8th of a mile.
Gusty Santa Ana winds occurred in the San Bernardino Mountains the evening of the 26th into the morning of the 27th. Heaps Peak RAWS reported a wind gust of 64 MPH at 2:15 AM on the 27th.
Gusty Santa Ana winds occurred the evening of the 26th into the morning of the 27th with some stations measuring gusts over 55 MPH.
Gusty Santa Ana winds occurred across the Orange County Mountains and foothills. The Fremont Canyon RAWS measured a wind gust of 79 MPH at 1:51 AM on the 27th.
Gusty Santa Ana winds impacted areas of the Riverside County Mountains from the evening of the 26th into the morning of the 27th. University of California San Diego HPWREN network observations measured a 68 MPH wind gust around 1 AM.
Cal Fire reports firefighter injury during the Hawk Fire, which burned 10 acres near Japutal Valley Road and Hawk Ridge between 1 and 3 PM on the 27th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2020Every state in 2020This day in weather historyWarnings in California, November 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 929482, 929483, 929083, 929084, 929236, 929481, 929237.