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 19 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
WIND
WESTERN AND NORTHERN SECTION OF IMPERIAL COUNTY
Mostly clear skies and unrestricted visibility.

CENTRAL AND EASTERN SECTION OF IMPERIAL COUNTY
Winds remain light and follow typical diurnal tendencies.

FIRE WEATHER
Strengthening onshore flow will bring increasing humidity for Wednesday with strong and gusty west to northwest winds for the mountains and deserts for Wednesday into Wednesday evening. A brief period of moderate offshore flow expected on Thursday.

The most likely areas to experience near critical fire weather conditions from gusty north to northeast winds and decreasing humidity would be below the Cajon Pass and inland Orange County mainly late Thursday morning into Thursday afternoon.

SYNOPSIS FROM THE SAN DIEGO OFFICE
Weak onshore flow will return today with slow cooling near the coast spreading inland. A low-pressure system moving into the Great Basin Wednesday will bring stronger onshore flow with cooling more clouds and strong gusty west winds in the mountains and deserts. A weakening cold front will move through far southern California late Wednesday afternoon into Wednesday evening with small chances for very light precipitation along and west of the mountains. A period of moderate offshore will follow for Thursday with gusty north winds. Dry with a warming trend for Friday through Christmas with weaker winds.

SYNOPSIS FROM THE PHOENIX OFFICE
Near to slightly above normal temperatures will persist through mid-week amidst mostly clear skies. A strong storm system will move into the Great Basin Wednesday and Thursday bringing an increase in winds, and substantially cooler temperatures into the second half of the week. However, rainfall chances will remain very low.
Weather Story Phoenix Station Weather Story San Diego Station
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