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 4 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
WINDS
Imperial County Airport
Low level wind shear may not be much of a concern but gusty winds and possible dust may cause some problems for aviation

Further north, Blythe, wind shear and reduced visibility may be a problem due to strong and gusty surface winds near 17 mph and strong winds 51 mph up to 2k feet.

FIRE WEATHER
TODAY THROUGH THURSDAY
Surface high pressure over the Great Basin will bring a prolonged period of moderate to strong Santa Ana winds and very low humidity with a Red Flag Warning in effect except for the deserts.

Lowest daytime humidity will fall to 5 to 10 percent with poor overnight recovery. Areas of northeast winds 20 to 30 mph with gusts to 55 mph widespread winds are expected for late night into Tuesday and again for late Wednesday night into Thursday.

DISCUSSION FROM THE SAN DIEGO OFFICE
TODAY THROUGH THURSDAY
Clearing of the fog and stratus is expected early this morning from north to south as Santa Ana winds develop and strengthen. Those Santa Ana winds have begun to develop along the coastal slopes of the San Bernardino County mountains and below the Cajon Pass with strongest gust through 3 am of around 40 mph.

Surface high pressure over the Great Basin will bring periods of moderate to strong Santa Ana winds into Thursday. The winds will strengthen and spread southward across the area today with the stronger winds below the Cajon pass and along and near the coastal slopes of the Santa Ana mountains. The strongest winds are expected for late tonight into Tuesday and again late Wednesday night into Thursday. Winds on Wednesday are not expected to be as strong mostly weak to moderate in strength.

WIND ADVISORY has been issued for the Los Angeles/Oxnard areas.

SYNOPSIS FROM THE PHOENIX OFFICE
A dry cold front will lead to much cooler temperatures and breezy to windy conditions today most noticeable over southeast California and southwest Arizona. Breezy conditions expand to south-central Arizona Tuesday and continue off and on through Thursday. Expect lower desert highs to be in the mid 60s to lover 70s during this time. There will also be a slight chance of showers Tuesday night and Wednesday over portions of south-central Arizona mainly the higher terrain. Anticipate minor warming over the weekend along with dry conditions.

Expect winds on the valley floors to remain below Advisory levels since the best cold air advection will be done before sunrise. However, anticipate that winds will be strong enough for localized dust at time in that area.
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