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

Date:  2-Sep-14 Local Time:  07:37 AM Meteorologist:  Gerber
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 19 Wind Speed (mph)  = 10
500 millibar height (decameters) = 587 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.4
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 16.5
Allocation Equation: = 2966
   
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 24 23 1 0.17 200 22 COL
Sutter 21 18 1 0.17 200 16 YUB
Butte 16 12 1 0.17 200 17 CIC-GRD
Yolo/Solano 20 10 1 0.15 200 18 DAV-WOO
Glenn 25 26 1 0.13 200 18 WLW
Sacramento 10 6 1 0.09 200 16 SAC
Yuba 21 18 1 0.07 200 16 YUB
Placer 12 11 1 0.05 200 14 ROS
Tehama 25 26 1 200 acres
unless reduced
by PM
200 18 WLW
Shasta 21 42 1 200 9 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***
Despite strong morning inversions, dispersion by early this afternoon should become fairly good as a decent delta flow helps to keep things fairly mixed in the South Valley with temps about 10-15 degrees cooler than Monday. The North Valley will still see afternoon temps in the mid to upper 90s with south flow eventually making it up the valley. Any burning planned for today should hold off until mid-day to allow inversions to mix out.
***24 Hour + Outlook****
*** Permissive Burn Day***
Weak West Coast troughing will provide a deep enough marine layer much of this week to help keep the delta flow ongoing. Good dispersion, mild to warm temps and good AQ is expected.

Mixing Height Discussion:
Valley: Mixing heights will reach near 2,500  feet by afternoon.
Winds:
Valley: SE/SW 5-10 mph, 15+ by late afternoon & evening.
Delta: SW 10-20 mph, 25+ by evening.