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.

January 19 2018
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
STRONG BUT FAST-MOVING STORM SYSTEM TO MOVE THROUGH SOUTHERN CALIFORNIA THIS WEEKEND.

IMPERIAL COUNTY
Mostly sunny conditions with light winds in the morning will turn cloudy with increasing winds by Friday afternoon. However, highs will be 70 to 75. Light southwest winds in the morning will increase to 10 to 20 mph in the afternoon with gusts up to 30 mph. Friday night will be partly cloudy with a slight chance of measurable rain of 20 percent. Temperatures will drop Friday night to 48 to 58 degrees, while winds will increase to 20 to 30 mph. Gusts may reach up to 40 mph. For Saturday, skies will clear somewhat but it will remain windy across southeast California and Imperial County. West winds will be 20 to 30 mph with gusts up to 40 mph. Highs will only reach 58 to 63 degrees. Saturday night will be clear, windy and colder. Lows will drop to 39 to 49 degrees. Westerly winds will remain strong up to 15 to 25 mph in the evening and decreasing to 5 to 10 mph after midnight. Gusts will be up to 40 mph in the evening. On Sunday things should settle down. Winds should lessens and temperatures should start to climb a bit into next week.

SYNOPSIS FROM THE SAN DIEGO OFFICE
Through Saturday a low pressure system will move inland through California and into Arizona bringing stronger onshore flow with cooling. There will be strong gusty west winds in the mountains and deserts and scattered mostly light showers along and west of the mountains for Friday afternoon into Saturday morning. Rainfall is expected to range from less than one tenth inch near the coast to one tenth to one quarter inch in the mountains with local amounts to around one half inch. Snow levels above 7000 feet will lower to around 5500 to 6000 feet during the late afternoon to around 4500 feet during the evening and around 3500 feet by Saturday morning with a few inches of snowfall mostly above 4500 feet. Sunday through Wednesday will see a drying and warming trend.

SYNOPSIS FROM THE PHOENIX OFFICE
High pressure will prevail across the region today with above normal temperatures and dry conditions. A notable storm system will move into the Southwest later today and into Saturday. While it still does not look like a very wet system, it will result in increasing winds and a significant drop in temperatures. Breezy southwest to west winds develop over the western deserts Friday afternoon with some windy conditions over favored higher terrain locations in far SE California, such as Joshua Tree NP. Winds should stay below wind advisory thresholds. After a cool Saturday and Sunday, temperatures will slowly rebound heading into the first part of next week.
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