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 25 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
Strong west winds will spread from southeast California through much of Arizona today.

The strongest wind gusts will occur during the afternoon and early evening hours; and a Wind Advisory continues in effect for the entire region. Winds gusts between 30 and 50 mph will be common across the area which will likely generate areas of dense blowing dust and sand. Visibilities may drop below 1 mile in some locations, especially adjacent to open fields. In addition, humidity levels will fall to near 10 percent and in combination with the strong winds, fire danger will become very high. Do not attempt any burning today and no open flames outdoors. If you are driving and encounter strong gusty winds, remember to keep both hands on the wheel and slow down. Keep a good distance between you and the cars in adjacent lanes and take extra caution when passing high profile vehicles

BRIEF DISCUSSION FROM THE PHOENIX OFFICE
A large negative height anomaly digging into the SWRN CONUS will be the focus for significant weather locally and downstream into the Central United States the next several days. Both WV imagery and objective analysis depict an initial lead vorticity maximum punching through SRN Nevada this morning and a secondary vorticity lobe descending south from NRN California through the WRN periphery of the deepening trough Axis. The lead wave is associated with the front edge of a narrow jet corridor and boundary layer frontal zone. Correspondingly the best SFC pressure falls have occurred under the diffluent left front jet quadrant in SRN Nevada. A fairly tight gradient has materialized over SERN California (KSAN-KLAS DELTA_P Greater than 14MB) yielding frequently gusty winds descending off higher terrain of San Bernadino and San Diego counties.

SYNOPSIS FROM THE PHOENIX OFFICE
Several weather disturbances will pass through the region this week bringing occasionally stronger wind gusts cooler than normal temperatures and a remote chance of an isolated shower. The first system will move into the area today with strong winds and some blowing dust. The next area of low pressure will affect the region Thursday with more breezy conditions and an outside chance of showers and thunderstorms over higher terrain north and east of Phoenix. The final disturbance will rotate towards the regions by the end of the weekend.

BRIEF DISCUSSION FROM THE SAN DIEGO OFFICE
Cloudy this morning with a few showers moving east at about 20mph mostly over the San Bernardino MTNS and the high deserts where a few hundredths to near two tenths of an inch of rain has fallen in some locations. Above 7000 Ft a dusting of snow was observed at a few locations. Elsewhere west of the MTNS trace amounts were reported at a few locations. The winds have increased from the west and several locations in the MTNS have reported wind gusts of 50-60mph.

The trough of low pressure responsible for the winds and showers will move through California today and into the Rockies by Tues morning. Expect cool and unsettled weather to continue through this evening with isolated showers tapering off by midnight. Most of the precip will fall over and west of the MTNS although accumulations are expected to be less than 0.25 inch and most locations will receive little or no rain. The West winds will continue to increase through the morning peaking in the afternoon/evening then weakening overnight.

SYNOPSIS FROM THE SAN DIEGO OFFICE
Mostly cloudy and cool today with strong and gusty west winds and isolated light showers over and west of the mountains. Dry and a little warmer for Tuesday and most of Wednesday under weak high pressure aloft. Significant cooling again for late Wednesday and Thursday with a chance for showers and mountain snow along with gusty west winds in the mountains and deserts. The showers taper off on Friday but conditions remain cool before warming next weekend as a ridge aloft builds.
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