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

Date:  1-Aug-15 Local Time:  07:47 AM Meteorologist:  Liu
Ag Burn Decision Above 3000 ft:  No Burn Day    
A.M. Stability (F) = 11 Wind Speed (mph)  = 8
500 millibar height (decameters) = 590 Average Rainfall (in) = 0.00
Meteorological (MET) Factor   = 0.45
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 10.4
Allocation Equation: = 7634
   
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 18 17 1 0.17 200 16 COL
Sutter 8 4 1 0.17 200 7 YUB
Butte 14 12 1 0.17 200 9 CIC-GRD
Yolo/Solano 0 0 1 0.15 200 0 DAV-WOO
Glenn 10 10 1 0.13 200 5 WLW
Sacramento 13 12 1 0.09 200 10 SAC
Yuba 8 4 1 0.07 200 7 YUB
Placer 11 12 1 0.05 200 8 ROS
Tehama 10 10 1 200 acres
unless reduced
by PM
200 5 WLW
Shasta 22 22 1 200 17 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 ***
The upper-level ridge moving eastward with the increasing onshore flow brought in by the weak offshore trough has result in a better dispersion today than past several days. However, we are still under the influence of the surrounding wildfires. Therefore, highly recommend minimum or NO-BURN acres.

24hr Outlook
***Permissive Burn Day ***
The offshore weak trough and the monsoonal moisture will continue the cooling trend and the chances of showers and thunderstorm with abundant lighting over high-elevation regions. Smoke will continue to be an issue until full containment. Therefore, limited burn acres is still recommended.
Mixing Height Discussion:
Valley: Mixing heights over 2000 feet by early afternoon.
Winds:
Valley:Southerly/Southeasterly/Southwesterly 5-10 mph.
Delta: Westerly 15-30 mph, gusting to 30-35 mph