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

Date:  2-Mar-15 Local Time:  07:30 AM Meteorologist:  Mims
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Good)    
A.M. Stability (F) = 1 Wind Speed (mph)  = 8
500 millibar height (decameters) = 550 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.7
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 7.6
Allocation Equation: = 12651
   
ARB REVISED Basinwide Allocation _________________________________________ = 4000
Revised Allocation _________________________________________ = 4000
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 5 7 1 0.17 540 8 COL
Sutter 4 5 1 0.17 540 6 YUB
Butte 4 7 1 0.17 540 3 CIC-GRD
Yolo/Solano 6 7 1 0.15 500 8 DAV-WOO
Glenn 3 4 1 0.13 460 3 WLW
Sacramento 10 16 1 0.09 380 4 SAC
Yuba 4 5 1 0.07 340 6 YUB
Placer 9 13 1 0.05 300 9 ROS
Tehama 3 4 1 200 acres
unless reduced
by PM
200 3 WLW
Shasta 12 12 1 200 19 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 well advertised weak low pressure system is bringing clouds and light showers into the valley this morning. This trend will continue through the burn hours as the atmosphere destabilizes more this afternoon. The spotty nature of the rainfall dictates some fields will remain damp so cation is advised. Winds will be out of the south and a bit gusty this morning, while dispersion remain good under partly to mostly cloudy conditions.

24 Hour Outlook
***Permissive Burn day or Restricted Fields ***
High pressure building will bring breezy north winds tomorrow. North winds will decrease as high pressure and dry weather continues through the week.
Mixing Height Discussion:
Valley: Mixing heights about 2,000 ft by afternoon.
Winds:
East Valley: Southerly 5-15 mph, gusting to 20 mph this morning
West Valley: Light and variable to 5 mph.
Delta: Southwesterly 4- 10 mph.