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.

November 15 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
SYNOPSIS FROM THE SAN DIEGO OFFICE
Cooler temperatures for the coast today but still warm inland. Much cooler with low clouds and fog for Wednesday with gusty west winds in the mountains and deserts as cold front approaches. A weak Santa Ana wind will develop early Thursday and begin a warming trend through Saturday. There is a chance of showers for Monday when an upper level low pressure area arrives

A fast moving short wave trough and associated cold front will approach the region on Wednesday leading to breezy conditions for the mountains and desert slopes. Low clouds well inland and deep marine layer forming Wednesday afternoon and evening. Frontal passage is Wednesday night just after midnight and winds will abruptly shift to northerly. This sets the stage for a weak to moderate Santa Ana wind event on Thursday under offshore flow. This will also remove all the low clouds and deep marine layer leading to a warming trend on Thrusday and much warmer and low humidity for Friday and Saturday.

SYNOPSIS FROM THE PHOENIX OFFICE
Unseasonably warm temperatures can be expected today with readings approaching records at some locations. A low pressure system will then move through the western states Wednesday and Thursday. This will result in breezy to windy conditions and much cooler temperatures...most noticeably on Thursday. In fact, highs on the low deserts Thursday will be around 70. The coolest morning so far this month will be on Friday. A warming trend is expected over the weekend. A weather system may bring unsettled conditions next week

Wednesday and Thursday... High pressure over us will be pushed eastward on Wednesday as a Pacific low pressure system begins moving inland. High clouds will get fairly thick as the weak upper low gets absorbed into the main branch of the westerlies and shears out in the process. As a result, high temps Wed. will be at least a few degrees lower. As the Pacific system continues moving inland, a dry cold front associated with the system moves through southern California and Arizona in the Wednesday night-Thursday time frame. This will result in breezy to windy conditions and much cooler temperatures. Winds will be strongest over southeast CA and southwest AZ and there could be some blowing dust there but northerly component to the wind is less favorable. Highs on Thursday will drop about 15 degrees compared to Wednesday. Of note, the GFS has continued to fluctuate in it`s solutions but now it is much closer to the ECMWF which has had good run-to-run continuity
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