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

Date:  28-Aug-15 Local Time:  07:44 AM Meteorologist:  Gerber
Ag Burn Decision Above 3000 ft:  Marginal Burn Day    
A.M. Stability (F) = 16 Wind Speed (mph)  = 10
500 millibar height (decameters) = 585 Average Rainfall (in) = 0.00
Meteorological (MET) Factor   = 0.45
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 6.7
Allocation Equation: = 5165
   
ARB REVISED Basinwide Allocation _________________________________________ = 2000
Revised Allocation _________________________________________ = 2000
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 10 15 1 0.17 200 7 COL
Sutter 7 11 1 0.17 200 4 YUB
Butte 9 10 1 0.17 200 5 CIC-GRD
Yolo/Solano 0 0 1 0.15 200 0 DAV-WOO
Glenn 9 11 1 0.13 200 2 WLW
Sacramento 16 20 1 0.09 200 12 SAC
Yuba 7 11 1 0.07 200 4 YUB
Placer 11 13 1 0.05 200 7 ROS
Tehama 9 11 1 200 acres
unless reduced
by PM
200 2 WLW
Shasta 14 14 1 200 10 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 ***
Increasing clouds and S/SW flow this afternoon as a EPAC trough nudges closer to the coast. A few sprinkles along the extreme NW corner of the valley/foothills today but otherwise dry and still hot the further North of the Delta you are. More noticeable cooling in the extreme South Valley due to increasing onshore flow.

24hr Outlook
***Permissive Burn Day***
The main front associated with our incoming low will swing through early Saturday morning with some light shower potential in the extreme North and West sides of the valley. Otherwise the clouds and onshore flow will help to drop temps for the weekend some 10-15 degrees from this past week. Dispersion and air quality look good through most of the upcoming week as SW flow remains which will also keep area temps some 15 degrees cooler then average.

Mixing Height Discussion:
Valley: Mixing heights will reach above 2,500 feet by early afternoon
Winds:
Valley:L/V early today, turning S/SW 5-15 mph into afternoon.
Delta: SW 10-15 mph .