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

Date:  26-Jan-20 Local Time:  07:22 AM Meteorologist:  Gerber
Ag Burn Decision Above 3000 ft:  Permissive Burn (Good)    
A.M. Stability (F) = -6 Wind Speed (mph)  = 8
500 millibar height (decameters) = 567 Average Rainfall (in) = 0.40
Meteorological (MET) Factor   = 0.8
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 12.4
Allocation Equation: = 8372
   
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 15 16 1 0.17 200 14 COL
Sutter 18 17 1 0.17 200 12 YUB
Butte 20 21 1 0.17 200 14 CIC-GRD
Yolo/Solano 17 16 1 0.15 200 15 DAV-WOO
Glenn 13 15 1 0.13 200 13 WLW
Sacramento 17 14 1 0.09 200 16 SAC
Yuba 18 17 1 0.07 200 12 YUB
Placer - - 1 0.05 200 - ROS
Tehama 9 13 1 200 acres
unless reduced
by PM
200 9 RBL
Shasta 6 8 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:
*** WET Permissive Burn Day ***

Front moving through the region already this morning has spread light amounts of rain across the valley. Persistent rains will continue mainly across the far NW and W sides through mid-day while the rest of the valley can expect a light shower or two for today with gradual clearing by afternoon.

24hr Outlook
*** WET Permissive Burn Day ***
Another weak wave will impact the area Monday into Tuesday with more light rains across the CA/OR border while the rest of the region will just remain cloudy and mild. Breezy North winds return midweek as high pressure returns and shunts all incoming storms well to the North for the last remaining days of January.
Mixing Height Discussion:
Valley: Mixing heights above 2,000 feet.
Winds:
Valley:S 10-20 mph.
Delta: W/SW 5-15 mph