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.

May 2 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
The clearing trend that began last evening has continued overnight with the calmer winds and clearer skies temperatures have cooled to mild readings for early May with values ranging from the mid 50s to low 60s across South-Central AZ and mid 60s across southwestern AZ and Southeast Ca. Water vapor loops and 500mb plots show rex block albeit short lived over the western North American continent. The main upper low center from this weekend continues tracking across the Central Rockies and into the plains this AM while an additional trailing vort lobe on the Western fringe of the low spins through Central CA. This shortwave will swing through Northern portions of AZ today allowing for another round of precip activity for the mountains while leaving the lower desert elevations under some limited afternoon CU fields and warmer temperatures. Trend in height rises will continue throughout the day as Pacific high pressure begins to transition in the from the West shunting off the shortwave to the East and combining with the high center located over the Canadian Rockies. Latest best performing guidance indicate the 90s will return for the Western forecast zones while the South-Central AZ zones can look for temperatures peaking into the upper 80s today.

SYNOPSIS FROM THE PHOENIX OFFICE
Low pressure will make a slow exit to the east across Northern Az today keeping the focus of any lingering precip activity well north of our forecast area. High pressure moving in from the West will build over the desert Southwest through Thursday resulting in mostly clear skies and a strong warming trend. Another Pacific weather system will begin to move into the area Friday and for the coming weekend bringing much cooler temperatures breezy conditions and a slight chance of showers.

BRIEF DISCUSSION FROM THE SAN DIEGO OFFICE
At 9 AM PDT, water vapor satellite imagery displayed a weak upper-level ridge just off the coast of SW CA and an upper-level trough following close behind. Visible Satellite showed stratus over portions of the coastal waters and some cumulus developing over the San Bernardino County Mountains. Residual moisture and diurnal will create the possibility of an isolated shower or two over the San Bernardino county mountains this afternoon. High-res models indicate only light precipitation for the period. A cap on this morning's KNKX sounding will help limit shower activity. Increasing heights will help high temperatures rise around 5 deg F above normal today and tomorrow. Low clouds will develop tonight over the coast and around 20-30 miles inland.

SYNOPSIS FROM THE SAN DIEGO OFFICE
Weak high pressure aloft will create a slight warming trend through Tuesday. An approaching upper-level low will create cooler, wet and breezy weather at time Thursday through the weekend. Weak upper-level high pressure returns early next week creating near normal high temperatures and dry weather
Weather Story Phoenix Station Weather Story San Diego Station
Image for Phoenix Station Weather Story Image for San Diego Station Weather Story

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