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.

April 20 2016
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
BRIEF DISCUSSION FROM THE PHOENIX OFFICE
Morning upper air data showed warm 700 and 500 MB temperatures under general anti-cyclonic flow over the region suggesting another unseasonably warm day across our forecast area. Ditto Thursday but even warmer. Therefore no weather problems expected through Thursday. Forecasts in good shape. No short term updates necessary.

SYNOPSIS FROM THE PHOENIX OFFICE
Strengthening high pressure will bring clear skies and a warming trend to the region through Thursday with highs close to 100 degrees at the warmest lower desert locations today and Thursday. A series of Pacific low pressure systems will bring cooler temperatures but little chances of any rainfall to the region Friday through at least the early part of next week.

BRIEF DISCUSSION FROM THE SAN DIEGO OFFICE
Skies were clear this morning though after a warm day/evening Tuesday temps were a little lower early this morning versus 24 hours ago. The 12Z NKX sounding has 1-2 deg cooling below about 750MB. The slight cooling below 750 MB will translate down to the surface in the coastal/valley areas though the profile further east especially over the deserts is relatively unchanged so the deserts should be as warm as on Tuesday or possibly even a bit warmer with a bit of renewed ridging moving into So-cal from the SW which means upper 90s in the lower deserts for highs today. That trend will continue Thursday with gradual cooling west of the mountains 70s in coastal areas and 80s in the valleys but little change in the deserts.

With the thermal gradient increasing over the mountains some locations from the ridges east to the desert foothills and through San Gorgonio pass will be breezy today and Thursday mainly afternoons/evenings though most gusts will be under 40mph.

SYNOPSIS FROM THE SAN DIEGO OFFICE
Warm and dry weather will continue through Thursday through high temperatures will lower slightly each day west of the mountains. More significant and widespread cooling will occur on Friday along with increasing clouds. A few showers will be possible over and west of the mountains Friday evening into early Saturday along with gusty west winds in the mountains and deserts. The cooler weather will continue over the weekend. Another system could bring a few showers Monday.
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