AIR POLLUTION
CONTROL DISTRICT

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Old Advisory Events

The information herein is NOT intended for use as a weather forecast. The Air District DOES NOT forecast but solely compiles information from both the Phoenix and San Diego National Weather Offices to relay information concerning potential changes in ambient air concentrations that may impact the public.

December 5 2017
Be Advised
High wind levels have the potential to suspend particulate matter into the air. High levels of PM10 may pose an impact to public health. It is recommended that active children and adults, and people with respiratory disease, such as asthma, limit their outdoor activities.

Potential increases in PM10 concentrations may increase to moderate or unhealthy level.

Imperial County Weather Synopsis
URGENT WEATHER MESSAGES
Los Angeles/Oxnard, Ventura County, San Bernardino, Riverside County Valleys, Inland Empire, San Diego County and associated mountain ranges.
HIGH WIND WARNINGS REMAIN IN EFFECT UNTIL 4PM PST THURSDAY.

Imperial County Airport
Anticipate similar wind pattern today as yesterday with breezy to windy northerly conditions after 8am with gusts 23 to 34 mph

RED FLAG WARNINGS
TODAY THROUGH THURSDAY
Strong surface high pressure over the Great Basin will bring a prolonged period of moderate to strong Santa Ana winds and very low humidity while a RED FLAG WARNING remains in effect for all areas except the deserts. Lowest daytime humidity, potentially 5%, expected in many areas with poor overnight recovery.

Winds will be slightly weaker Friday, but the combination of wind and humidity will likely continue conditions conducive to critical fire weather.

DISCUSSION FROM THE SAN DIEGO OFFICE
TODAY THROUGH WEDNESDAY
Strong winds have been occurring all night in the Northern Inland Empire and inland Orange County where winds gusts have been measured around 45 mph with higher gusts in isolated remote canyon locations. The strongest winds will continue this morning in these areas with winds increasing this morning further south including San Diego County with isolated gusts 60 to 70 mph in the wind favored canyons.

Winds will gradually decrease remaining gusty this afternoon through Wednesday. Another surge of Santa Ana winds is expected to develop late Wednesday night peaking Thursday morning with much more stronger winds expected in San Diego County.

SYNOPSIS FROM THE PHOENIX OFFICE
Breezy to windy conditions will continue for southeast California on Tuesday with lighter breezes elsewhere. Breezes will continue area wide on and off through Thursday as multiple disturbances move through our area. Expect lower desert highs to be in the mid 60s to lower 70s during this time. There will be a slight chance of showers Tuesday night and Wednesday over portions of south-central Arizona mainly the higher terrain. Anticipate some warming over the weekend along with dry conditions.
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