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

Date:  6-Jul-15 Local Time:  07:29 AM Meteorologist:  Branz
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 8 Wind Speed (mph)  = 9
500 millibar height (decameters) = 585 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.6
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 5.1
Allocation Equation: = 6701
   
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 14 21 1 0.17 370 8 COL
Sutter 8 18 1 0.17 370 3 YUB
Butte 7 13 1 0.17 370 3 CIC-GRD
Yolo/Solano 6 7 1 0.15 350 4 DAV-WOO
Glenn 606 0 1 0.13 330 0 WLW
Sacramento - - 1 0.09 290 - SAC
Yuba 8 18 1 0.07 270 3 YUB
Placer 4 5 1 0.05 250 8 ROS
Tehama 606 0 1 200 acres
unless reduced
by PM
200 0 WLW
Shasta 15 16 1 200 7 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 ***
Onshore flow continues this morning as an upper low lurks offshore. Expect temps to run about 5 degrees cooler in most locations today. Otherwise...little change is expected. Dispersion should be better today with continued southerly winds across the entire region.

24hr Outlook
***Permissive Burn Day***
A gradual cooling trend will continue as the aforementioned upper low drifts slowly inland. Dispersal conditions and air quality should remain fair to good through the week with onshore flow and cooler air aloft associated with the low. As this feature moves across the North State on Wednesday and Thursday, thunderstorms are possible over the higher terrain. We may even see a few storms in the Valley on Wednesday and Thursday.
Mixing Height Discussion:
Valley: Mixing heights will reach 2500-3000 feet by mid-afternoon.
Winds:
Valley: Southerly 8-12 mph.
Delta: West to southwesterly 10-20 mph, gusting to 25 mph this afternoon.