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

Date:  22-Aug-17 Local Time:  07:39 AM Meteorologist:  Mims
Ag Burn Decision Above 3000 ft:  Permissive Burn (Good)    
A.M. Stability (F) = 10 Wind Speed (mph)  = 6
500 millibar height (decameters) = 586 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.4
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 15.6
Allocation Equation: = 4419
   
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 - - 1 0.17 200 - COL
Sutter 12 10 1 0.17 200 10 YUB
Butte 21 24 1 0.17 200 19 CIC-GRD
Yolo/Solano 16 14 1 0.15 200 16 DAV-WOO
Glenn 12 13 1 0.13 200 13 WLW
Sacramento 16 12 1 0.09 200 19 SAC
Yuba 12 10 1 0.07 200 10 YUB
Placer 8 7 1 0.05 200 6 ROS
Tehama 18 22 1 200 acres
unless reduced
by PM
200 16 RBL
Shasta 32 33 1 200 24 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 ***
Not too much change as the low pressure system remains just off Central CA. Continued fair dispersion, AQI, and overall "cool" weather is expected along with a possible shower or two as the convective perifery is over us. Nothing major since this is August, but it does add excitement to the forecast. As does the haze and smoke moving in. This will keep the PM numbers elevated up north and near the delta. Winds should slacken a bit and remain onshore flow.

24hr Outlook
*** Permissive Burn Day ***
Not much change. Fair dispersion through Thursday as we quickly go from ridge to trough over a two day period. Increasing haze and PM concentrations as shifting winds are expected later in the week. A warming trend into the weekend as high pressure re-establishes itself.
Mixing Height Discussion:
Mixing heights will reach above 2,000 feet by afternoon.
Winds:
Valley: S/SE 5-10 mph.
Delta: W/SW 10-20 mph.