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.

November 22 2017
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
EXTENDED THANKSGIVING FORECAST - HAPPY THANKSGIVING

FORECAST FROM THE SAN DIEGO OFFICE

WEDNESDAY (November 22, 2017) THROUGH FRIDAY (November 24, 2017)
High pressure aloft anchored along the West Coast combined with weak offshore lower level flow will bring high daytime temperatures at lower elevation through Thanksgiving and low inland humidity. There will be gusty northeast winds less than 40 mph near the coastal foothills and below passes and canyons this morning with weaker winds for Thanksgiving morning. The gusty winds combined with low humidity elevate the fire weather condition through Thanksgiving.

Areas like Borrego Springs, Palm Springs, Thermal and areas like Chula Vista, Escondido and El Cajon will continue to see temperatures in the 90s for today with slight cooling by Friday.

SATURDAY (November 25, 2017) THROUGH TUESDAY (November 28, 2017)
High pressure aloft will continue to weaken during the weekend with onshore lower level flow strengthening for Sunday and Monday. This will bring greater cooling for Sunday and Monday with stronger and gusty southwest to west winds for the mountains and deserts.

Conditions are conducive for stronger Santa Ana winds and lower inland humidity for Tuesday (November 28, 2017) - Warming combined with a very dry air mass creates a more widespread critical fire weather condition.

DISCUSSION FROM THE PHOENIX OFFICE
Dry weather and unseasonably warm temperatures will persist through the weekend with near record highs each day. High pressure will weaken early next week bringing cooler, although still above average temperatures.

Clearing skies with very light winds, following typical diurnal tendencies will prevail for the next 24 hours.

Strong high pressure aloft will persist across the lower deserts for the rest of the week and likely into early next week as well. This will keep high temperatures well above seasonal normal with the warmer deserts into the mid to upper 80s.

Sunny to mostly sunny days through Saturday. Dry conditions, minimum humidity and light winds across the south-central deserts.
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