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.

June 30 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
The latest medium range models continue to have some disagreements, mainly regarding the strength and placement of next weeks high pres ridge, with the EC now favoring a position around or to the south of the border through much of next week, which would keep any subtropical moisture "return flow" from reaching Socal. The GFS has been consistently showing a more southerly placement, also it is trending a bit stronger with the PacNW troughing through the end of next week, which could support the further south position of the ridge south of the border better. The ensembles also are having trouble nudging the ridge much to the north of Socal, with the PacNW trough showing some southward expansion. Therefore, it seems like more of a persistence forecast is the way to go for the forecast towards mid to late next week, but with some slight warmup away from the coast due to the persistent ridge likely to be near or just to the south for much of mid to late next week. Will also not add any mention of precipitation for the time being due to the ridge position

High pressure aloft will weaken and result in a cooling trend the rest of this week and for the upcoming holiday weekend. There is a small chance of showers and storms over the mountains this afternoon and early evening, and again Friday afternoon and early evening. Dry conditions prevailing by the weekend. Areas of night and morning coastal low clouds and fog will expand slightly through the end of the week, along with gusty west to southwest winds over the mountains and deserts. The high pressure ridge will rebuild early next week and bring slight warming

SYNOPSIS FROM THE PHOENIX OFFICE
Plentiful monsoonal moisture will bring continued chances for showers and thunderstorms through at least Friday. Due to the increased moisture and cloud cover, high temperatures will fall with some locations dropping below 100 degrees today and Friday. There will be a return to drier southwest flow aloft over the weekend and into early next week which will limit thunderstorms to higher terrain areas east of Phoenix by Sunday. High temperatures will steadily climb late this week and early next week as the atmosphere becomes drier.
Weather Story Phoenix Station Weather Story San Diego Station
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