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 18 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
There continues to be very high forecast confidence for this period as all of the major global model suites are showing high pressure building into the desert Southwest as the upper low that affected our weather last week continues to move away to the North East. The GFS EURO GEM and most of their respective members are showing 500mb heights rising into the 578-580ODM range by Wednesday and Thursday with dry conditions and mostly clear skies prevailing through the entire period. As a result lower desert temperatures are expected to rise well up into the mid/upper 90s by Wednesday/Thursday which is around 10 degrees above normal. As far as the prospects for the first 100 degree day at sky harbor is concerned given the tight spread in the model high temperature forecasts is seems unlikely at this time that 100 degrees will be reached this week with highs likely topping out a few degrees short of the century mark on Wednesday or Thursday

COASTAL AREAS REPOT
A ridge of high pressure along the West Coast will slowly give way to a trough of low pressure late in the week. This will send temperatures that are 7 to 15 degrees above average on Monday on a slow slide back to average values by Friday. Night and morning low clouds will return to coastal areas by Thursday with a slight chance of showers developing late Friday for the mountains westward

Strong high pressure over the region today will bring sunny and warm conditions with temperatures well above average especially west of the Mountains. A few record maximum temperatures are forecast to break this afternoon. By mid-week this ridge will begin to weaken and a gradual cooling trend will occur. Friday into early this weekend a low pressure trough approaches Southern California. This feature will act to deepen the marine layer bring cooler weather and generate a slight chance of showers over the mountains
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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