California Air Resources Board - Meteorology Section
Basinwide Ag-Burn Acreage Allocation - Sacramento Valley Air Basin

Date:  31-Aug-15 Local Time:  07:34 AM Meteorologist:  Mims
Ag Burn Decision Above 3000 ft:  Permissive Burn Day    
A.M. Stability (F) = 14 Wind Speed (mph)  = 5
500 millibar height (decameters) = 584 Average Rainfall (in) = 0.00
Meteorological (MET) Factor   = 0.25
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 5.6
Allocation Equation: = 5425
   
ARB REVISED Basinwide Allocation _________________________________________ = 3000
Revised Allocation _________________________________________ = 3000
District Yesterday's
24-Hr Avg
PM2.5
Yesterday's
PM2.5
(0-6 PST)
Reduction
Factor
Proration Final
Allocation
(Acres)
Avg PM2.5
(0-6 PST)
Conc Stn
Colusa 6 5 1 0.17 370 4 COL
Sutter 3 1 1 0.17 370 2 YUB
Butte 4 4 1 0.17 370 4 CIC-GRD
Yolo/Solano 0 0 1 0.15 350 0 DAV-WOO
Glenn 3 4 1 0.13 330 4 WLW
Sacramento 12 12 1 0.09 290 7 SAC
Yuba 3 1 1 0.07 270 2 YUB
Placer 7 6 1 0.05 250 7 ROS
Tehama 3 4 1 200 acres
unless reduced
by PM
200 4 WLW
Shasta 13 9 1 200 13 AND
When any district's 0-6 am average PM2.5 is >= 27 ug/m increasing concentrations will result in a reduction
in allocation acres (e.g. 27-28 : 20%, 29-30 : 40%, 31-32 : 60%, 33-34 : 80%)
ARB Comments
Cautionary Comments:
***Permissive Burn Day ***
High pressure building within the large scale trough will provide pleasant, warming conditions to the region today. Stability has moved up a few notches and winds will remain light in response to this transition. This will subdue dispersion conditions a bit from this weekend. But all things being equal, conditions are still very good for August.

24hr Outlook
***Permissive Burn Day***
A more normal trough response pattern returns tomorrow as the delta breeze strengthens and winds take a more southerly, onshore direction though Wednesday. A transition period both Thursday and Friday as the trough finally moves out this weekend. Dispersion and air quality still look good through this period.

Mixing Height Discussion:
Valley: Mixing heights above 2,000 feet by early afternoon
Winds:
Valley:Northerly this morning 3-8 mph, turning light and variable tending Southerly to 5 mph late.
Delta: Southwest 5-15 mph.