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

Date:  9-Feb-16 Local Time:  08:15 AM Meteorologist:  Gerber
Ag Burn Decision Above 3000 ft:  No Burn Day    
A.M. Stability (F) = 25 Wind Speed (mph)  = 8
500 millibar height (decameters) = 582 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.3
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 15.2
Allocation Equation: = 2230
   
ARB REVISED Basinwide Allocation _________________________________________ = 2000
Revised Allocation _________________________________________ = 1800
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 6 1 0.17 200 11 COL
Sutter 11 20 1 0.17 200 13 YUB
Butte 8 9 1 0.17 200 9 CIC-GRD
Yolo/Solano 34 39 0 0.15 0 41 DAV-WOO
Glenn 2 2 1 0.13 200 2 WLW
Sacramento 10 0 1 0.09 200 12 SAC
Yuba 11 20 1 0.07 200 13 YUB
Placer 10 12 1 0.05 200 6 ROS
Tehama 2 2 1 200 acres
unless reduced
by PM
200 2 WLW
Shasta 9 8 1 200 8 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:
*** Restricted Field Day***
*****Restricted Field Day due to strong morning inversions*****Allocation reductions are also in place *****Gradients have relaxed over the region today with our ridge shifting a little eastward. However record afternoon max temps could be broken again today as forecasted afternoon temps are to peak around the mid to uppers 70s...Morning and overnight inversions will continue to trap daytime pollutants which will be slow to mix out during the day.

24hr Outlook
*** Restricted Field Day***
The pattern is expected to stay dry and unseasonably mild as a large West Coast ridge dominates however by Wednesday/Thursday our ridge is expected to flatten slightly leading to some cooling leading into the weekend. Dispersion and air quality will likely deteriorate this week due to lack of mixing.

Mixing Height Discussion:
Valley: Mixing heights near 1,200 feet this afternoon.
Winds:
Valley:N/NW 5-10 mph
Delta:E 5-10 mph