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

Date:  27-Mar-15 Local Time:  07:54 AM Meteorologist:  Liu
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 12 Wind Speed (mph)  = 5
500 millibar height (decameters) = 581 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.3
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 7.2
Allocation Equation: = 8371
   
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 6 3 1 0.17 370 8 COL
Sutter 5 6 1 0.17 370 10 YUB
Butte 6 4 1 0.17 370 10 CIC-GRD
Yolo/Solano 6 6 1 0.15 350 7 DAV-WOO
Glenn 7 2 1 0.13 330 8 WLW
Sacramento 5 3 1 0.09 290 11 SAC
Yuba 5 6 1 0.07 270 10 YUB
Placer 4 3 1 0.05 250 4 ROS
Tehama 7 2 1 200 acres
unless reduced
by PM
200 8 WLW
Shasta 9 5 1 200 6 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 ***
The upper level ridge has shifted east into the Great Basin as a trough approaches the West Coast. The incoming front will bring some clouds and set the stage for very good dispersion but very little chance of valley precipitation. Temperature will remain warm around 80s across the Valley and 60s-70s over the mountains.

24 Hour Outlook
*** Permissive Burn Day ***
Low pressure system passing through northern California will bring stronger westerly flow providing fair horizontal mixing and cooling over the Valley. Possible showers might occur over the mountain regions. . Otherwise temperatures will remain above normal through the rest of the weekend into early next week.
Mixing Height Discussion:
Valley: Mixing heights will near 3,000 feet.
Winds:
Valley: L+V 3-6 mph, then SW 5-10 mph by afternoon
Delta: Westerly 8-13 mph