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 19 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
NATIONAL WEATHER SERVICE
Issued: Thursday, May 19, 2016 @ 400 am MST/PDT
Valid For: Friday May 20, 2016
What: Strengthening west to southwest winds 20 to 25 mph with gusts 30 to 40 mph
Where: Southeast California and far western Arizona
When: Late afternoon and evening hours Friday
Weather Impacts: Hazardous cross winds, especially for high profile vehicles Local visibility reductions due to blowing dust Elevated fire danger - especially through the Colorado River Valley
Confidence: Medium

SYNOPSIS FROM THE PHOENIX OFFICE
Dry weather will return to most of Arizona and southeast California today with only isolated showers along the Mogollon Rim and far eastern Arizona during the afternoon hours. Another large Pacific disturbance will move into the western states through the end of the week, lifting north of Arizona over the weekend. This system will bring breezy and cooler than normal temperatures back to the region.

Upper level low has moved off well to the east of Arizona leaving behind a relatively dry and subsident northwesterly flow aloft. 12z plot data depicted anticyclonic flow across Arizona with 20-30m height rises. Moisture values were still elevated however, with PWAT values at 0.87 inches at San Diego and 0.75 inches at Tucson. Surface dewpoints over the lower deserts were mostly in the 40s at 8 am. IR imagery showed sunny skies area wide. Guidance remains consistent in calling for a short wave upper ridge to settle across the desert southwest today ahead of a deeper low developing along the nrn CA and PAC NW coast. The only threat for any precip over the area today will be across the higher terrain of southern Gila County, mainly east of Globe, where lingering low level moisture and very minimal CAPE values will allow for around a 10 percent chance of afternoon thunderstorms. Otherwise we can expect sunny skies today along with warming high temperatures; Phoenix will climb into the low to mid 90s with an official forecast high of 94 for Phoenix Sky Harbor airport. Current forecast looks to be in good shape and no updates needed

SYNOPSIS FROM THE SAN DIEGO OFFICE
The marine layer stratus will dominate through the weekend. While there will be good clearing today in the valleys, the coast will remain mostly cloudy this afternoon. By Friday and Saturday, even many valley locations will stay cloudy, and daytime temperatures will be well below normal over the region due to a trough of low pressure. There will be occasional drizzle and light rain during the nights and mornings through at least Saturday from the coastal slopes west to the coast, and there will be areas of strong winds in the mountains and deserts. The trough will weaken a little bit early next week, but temperatures will remain below normal, with a lot of coastal stratus, but better warming is likely late next week.

Temperatures will be well below normal by Friday and continuing Saturday, with most if not all areas west of the mountains, even in the valleys, staying in the 60s. By Saturday, even the lower deserts may have highs only around 80. In contrast, average highs in the lower deserts are now in the upper 90s. Heights do rise some early next week despite the continued troughing, but the overall air mass will not change much until some ridging comes in around Wednesday or Thursday of next week. Therefore, temperatures will stay below normal but with some increase early next week. While there will be colder air aloft, continued onshore flow will likely keep areas of stratus around early next week, with the possibility of the reverse clearing, where the west-facing mountain foothills clear last or not at all each da
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