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

Date:  20-Apr-14 Local Time:  06:29 AM Meteorologist:  Hanrahan
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 7.5 Wind Speed (mph)  = 7
500 millibar height (decameters) = 575 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.5
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 5.8
Allocation Equation: = 10357
   
ARB REVISED Basinwide Allocation _________________________________________ = 5000
Revised Allocation _________________________________________ = 5000
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 10 12 1 0.17 710 4 COL
Sutter 11 12 1 0.17 710 5 YUB
Butte 8 7 1 0.17 710 4 CIC-GRD
Yolo/Solano 7 9 1 0.15 650 5 DAV-WOO
Glenn 8 11 1 0.13 590 5 WLW
Sacramento 6 8 1 0.09 470 2 SAC
Yuba 11 12 1 0.07 410 5 YUB
Placer 10 11 1 0.05 350 8 ROS
Tehama 8 11 1 200 acres
unless reduced
by PM
200 5 WLW
Shasta 20 27 1 200 13 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****
Weak ridging over the state brings light northerly winds and warm temperatures. Daytime highs will range from 78 through 86, with warmer temperatures in the North. Winds, at the surface, will be light, up to 10mph, and northerly to northwesterly. Transport winds will start off with strong northerly winds along the western side of the valley, then weaken as the day progresses.

24hr Outlook:
***Permissive Burn Day***

Increasing clouds tomorrow as shortwave approaches. A slight chance of precip in the afternoon holds for the northern parts of the valley. Winds will shift to southwesterly and become gusty, especially in the afternoon. Transport winds will range from southeasterly to southwesterly and range in speed from 15 to 20mph.
Mixing Height Discussion:
Valley: Mixing heights will reach 2000-3000 feet by afternoon.
Winds:
North Valley: Northerly winds up to 10mph.
South Valley & Delta: Northwesterly winds reaching 10mph.