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

Date:  25-Feb-17 Local Time:  08:18 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Good)    
A.M. Stability (F) = -8 Wind Speed (mph)  = 5
500 millibar height (decameters) = 550 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.65
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 8.9
Allocation Equation: = 9702
   
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 3 3 1 0.17 370 6 COL
Sutter 12 11 1 0.17 370 14 YUB
Butte 8 10 1 0.17 370 10 CIC-GRD
Yolo/Solano 4 5 1 0.15 350 5 DAV-WOO
Glenn 9 8 1 0.13 330 12 WLW
Sacramento 13 15 1 0.09 290 11 SAC
Yuba 12 11 1 0.07 270 14 YUB
Placer 3 -1 1 0.05 250 2 ROS
Tehama 2 2 1 200 acres
unless reduced
by PM
200 -1 RBL
Shasta 14 19 1 200 16 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 ***
Regular Permissive Burn day as the valley dried out. A little more cloud cover this morning as the low is off coast of CA/OR heading south and remaining offshore, still some possible showers in the mtn regions.
Today, expect highs in the low to mid 50s, light and variable winds 3-5mph, then becoming light northerly 5-8mph by early aftn, delta winds L+V 3-5mph then light NW-NE 4-7mph by mid late aftn. Mixing hgts remaining at 2000-2500ft by mid aftn. Dispersion is fair to good. Happy Saturday!

24hr Outlook
*** Permissive Burn Day ***
Another PacNW low coming down, but weak and will only squeeze a few showers in the mtn regions. Some lingering showers into Mon. Then DRY for the rest of the week with the high pressure.

Mixing Height Discussion:
Valley: Mixing heights over 2,000-2,500 feet.
Winds:
Valley:L+V 3-5mph, then northerly 5-8 mph by early aftn
Delta: L+V 3-5mph, then NW-NE 4-7 mph by late aftn