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

Date:  1-Sep-14 Local Time:  07:26 AM Meteorologist:  Hanrahan
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 5 Wind Speed (mph)  = 6.5
500 millibar height (decameters) = 589 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.5
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 18.8
Allocation Equation: = 4647
   
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 16 9 1 0.17 200 24 COL
Sutter 12 9 1 0.17 200 18 YUB
Butte 12 7 1 0.17 200 13 CIC-GRD
Yolo/Solano 12 8 1 0.15 200 10 DAV-WOO
Glenn 13 3 1 0.13 200 24 WLW
Sacramento 5 7 1 0.09 200 6 SAC
Yuba 12 9 1 0.07 200 18 YUB
Placer 7 7 1 0.05 200 12 ROS
Tehama 13 3 1 200 acres
unless reduced
by PM
200 24 WLW
Shasta 12 4 0 0 42 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***
Smoke impacts in the North Valley have led to some reductions in acreage.
Ridge continues to build over the region, bringing clear skies and above average temperatures. Today the ridge is expected to peak and start breaking down tomorrow. Winds are from the north 10-15mph, with gusts reaching 20-25mph.
***24 Hour + Outlook****
*** Permissive Burn Day***
Trof develops over the region later in the week, bringing wind shifts and cooler weather.

Mixing Height Discussion:
Valley: Mixing heights will reach 4000 feet by afternoon.
Winds:
North Valley: Northerly winds from 10-15mph with gusts reaching 25mph.
North Valley: Northerly winds reaching 10mph with gusts to 20mph.
Delta: Westerly winds ranging from 10-15mph.