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

Date:  26-May-16 Local Time:  07:32 AM Meteorologist:  Branz
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 3 Wind Speed (mph)  = 7
500 millibar height (decameters) = 572 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.6
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 7.0
Allocation Equation: = 7549
   
ARB REVISED Basinwide Allocation _________________________________________ = 4000
Revised Allocation _________________________________________ = 4000
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 0.17 540 7 COL
Sutter 5 7 1 0.17 540 8 YUB
Butte 6 7 1 0.17 540 5 CIC-GRD
Yolo/Solano 8 6 1 0.15 500 9 DAV-WOO
Glenn 11 13 1 0.13 460 11 WLW
Sacramento 8 15 1 0.09 380 6 SAC
Yuba 5 7 1 0.07 340 8 YUB
Placer 6 5 1 0.05 300 7 ROS
Tehama 11 13 1 200 acres
unless reduced
by PM
200 11 WLW
Shasta 10 9 1 200 3 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 ***
Winds will become northerly today as the recent trough moves into the Great Basin. These winds will not be too strong however. Expect good vertical mixing this afternoon as AM stability remains low. Overall...dispersion will be fair to good today with the only limiting factor being lighter winds.

24hr Outlook
*** Permissive Burn Day***
North winds will strengthen for Friday as the pressure gradient tightens between the trough and a ridge over the eastern Pacific. This ridge will build into the North State for the weekend, bringing lighter winds and warmer temps, especially on Sunday. The ridge should peak in strength early next week before weakening a bit beyond that. Overall...expect a deterioration in dispersion for next week with the ridge in place.
Mixing Height Discussion:
Valley: Mixing heights will reach 2500-3000 feet by afternoon.
Winds:
Valley: North to northwesterly 5-10 mph.
Delta: Westerly 8-12 mph.