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.

March 29 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
SYNOPSIS FROM THE SAN DIEGO OFFICE
Skies will be clear today with warmer weather all areas due to passing high pressure. Highs will be mostly in the 80s in the valleys and lower 90s in the lower deserts. A strong low pressure system will develop over the Great Basin Thursday through Friday. It will bring very strong mountain and desert winds and cooler weather to all areas. Warmer weather will return over the weekend under weak high pressure, but low pressure will bring cooler conditions again by early next week.
A deep low with good model consensus will develop on Thursday over the Great Basin and create a very strong gradient over our mountains and deserts. A strong jet rounding the low will bring upper-level support for the potential for strong damaging winds over the mountains and deserts. The peak of the wind event is likely to be Thursday evening. Surfacing mountain waves over the Coachella Valley will be a significant concern where the potential for wind damage could occur, as well as in parts of the Mojave Desert, with blowing sand and dust also a possible significant impact in those areas. By this afternoon the forecast through Friday morning will have better confidence with full resolution short term models available to make a decision on issuing the high wind warning, so for now we have opted to continue the high wind watch in effect for most of the mountain and desert areas. The wind will quickly switch to northerly late Thursday night, and could bring another round of strong wind gusts through early Friday morning.

SYNOPSIS FROM THE PHOENIX OFFICE
High pressure building across the Desert Southwest will result in a warming trend through Thursday. A strong low pressure system will then produce windy conditions Thursday along with much cooler temperatures Friday. Scattered precipitation is possible across the higher terrain of eastern Arizona Saturday as the storm lingers. Warmer conditions will then return Sunday as high pressure again builds across the region.
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