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

Date:  11-Dec-19 Local Time:  07:21 AM Meteorologist:  Chen
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Good)    
A.M. Stability (F) = -5 Wind Speed (mph)  = 5
500 millibar height (decameters) = 569 Average Rainfall (in) = 0.12
Meteorological (MET) Factor   = 0.65
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 14.0
Allocation Equation: = 7699
   
ARB REVISED Basinwide Allocation _________________________________________ = 2000
Revised Allocation _________________________________________ = 2000
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 9 6 1 0.17 200 16 COL
Sutter 13 18 1 0.17 200 14 YUB
Butte 16 18 1 0.17 200 10 CIC-GRD
Yolo/Solano 10 4 1 0.15 200 19 DAV-WOO
Glenn 11 11 1 0.13 200 11 WLW
Sacramento 10 8 1 0.09 200 12 SAC
Yuba 13 18 1 0.07 200 14 YUB
Placer 13 10 1 0.05 200 15 ROS
Tehama 14 9 1 200 acres
unless reduced
by PM
200 15 RBL
Shasta - - 1 200 - 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:
*** WET Permissive Burn Day ***
A short upper-level disturbance passed through last night leaving some showers behind. Areas of dense fog have developed again in the morning, followed by cloudy conditions and intermittent showers peppering Northern California for the next few days. Poor dispersion with low mixing and calm winds throughout the valley.

24hr Outlook
*** WET Permissive Burn Day ***
Remaining damp with similar conditions of mostly cloudy skies and periods of rain and showers, mainly in the northern valley. Another system Friday night into Saturday, likely with more widespread precip. Drier conditions are expected for Sunday and the first half of the week next week with cooler nights.
Mixing Height Discussion:
Valley: Mixing heights near 1000-1500 feet.
Winds:
Valley: L/V 3-6 mph early, S/SW 5-10 mph in the afternoon.
Delta: L/V 3-6 mph, S/SW 5-10 mph in late afternoon.