[ADEQ Forecasts] ADEQ Daily Air Quality Forecast for Fri., Oct. 5

Thu Oct 4 11:45:42 MST 2007

For more information, or if you have problems viewing the image, please visit our Web page:

http://www.azdeq.gov/environ/air/ozone/ensemble.pdf

VERY UNHEALTHY  (201-300)

UNHEALTHY (151-200)

UNHEALTHY FOR SENSITIVE GROUPS (101-150)

MODERATE (51-100)

GOOD (0-50)

For more information visit:

http://www.epa.gov/airnow/aqibroch

AIR QUALITY FORECAST FOR FRIDAY, OCTOBER 05, 2007

This report is updated by 1:00 p.m. Sunday thru Friday and is valid

for areas within and bordering Maricopa County in Arizona

FORECAST

DATE

NOTICES

(*SEE BELOW FOR DETAILS) 

AIR POLLUTANT

YESTERDAY

WED 10/03/2007

NONE    

Highest AQI Reading/Site

(Preliminary data only)

TODAY

THU 10/04/2007

NONE 

TOMORROW

FRI 10/05/2007

NONE 

EXTENDED

SAT 10/06/2007

NONE

O3*

45

MULTIPLE SITES

31

GOOD

29

GOOD

35

GOOD

CO*

11

PHOENIX SUPER SITE & WEST PHOENIX

17

GOOD

10

GOOD

12

GOOD

PM-10*

55

HIGLEY & WEST 43RD

56

MODERATE

85

MODERATE

70

MODERATE

PM-2.5*

40

DURANGO

44

GOOD

54

MODERATE

48

GOOD

* O3 = Ozone      CO = Carbon Monoxide      PM-10 = Particles 10 microns & smaller      PM-2.5 = Particles smaller than 2.5 microns

*"Ozone Health Watch" means that the highest concentration of OZONE may approach the federal health standard.

"PM-10 or PM-2.5 Health Watch" means that the highest concentration of PM-10 or PM-2.5 may approach the federal health standard.

"High Pollution Advisory" means that the highest concentration of OZONE, PM-10, or PM-2.5 may exceed the federal health standard.

"DUST" means that short periods of high PM-10 concentrations caused by outflow from thunderstorms are possible.

Health message for Thursday, Oct 04: Unusually sensitive people should consider limiting prolonged exertion outdoors.

Health message for Friday, Oct 05: Unusually sensitive people should consider limiting prolonged exertion outdoors.

Synopsis and Discussion

There are a few clouds Thursday morning across the Valley of the Sun and even some showers to the north near Prescott.  This is all ahead of a trough of low pressure that is slowly moving east into the region.  What we can expect weather-wise here in the Phoenix forecast area is a slight chance for showers later Thursday afternoon with clearing early Friday.  By Friday afternoon the trough will be over Arizona. Winds are expected to be fairly strong out of the southwest and west, around 20 to 30 mph at times, with some pockets of blowing dust and reduced visibility.  As a result, particulates will also increase well into the "Moderate" range on Friday, decreasing only slightly on Saturday.  The entire system will push to the east of the region by Sunday and high pressure will begin to increase once again from the south.  Afternoon desert temperatures will struggle to reach 90°F on Saturday and Sunday as cooler air filters in behind the system.  Ozone will hold in the "Good" range through the weekend.  Catch tomorrow's forecast for a look at your weekend's forecasted weather and air quality in more detail.  Have a good day!  -J.Paul

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