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

Date:  28-Jan-15 Local Time:  07:28 AM Meteorologist:  Gerber
Ag Burn Decision Above 3000 ft:  Permissive Burn Day    
A.M. Stability (F) = 10 Wind Speed (mph)  = 11
500 millibar height (decameters) = 571 Average Rainfall (in) = 0.00
Meteorological (MET) Factor   = 0.65
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 29.0
Allocation Equation: = 2988
   
ARB REVISED Basinwide Allocation _________________________________________ = 1500
Revised Allocation _________________________________________ = 1150
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 30 24 0 0.17 0 35 COL
Sutter 25 23 0.6 0.17 90 29 YUB
Butte 19 18 0.8 0.17 120 27 CIC-GRD
Yolo/Solano 24 26 0 0.15 0 38 DAV-WOO
Glenn 24 20 1 0.13 150 21 WLW
Sacramento 15 20 1 0.09 150 24 SAC
Yuba 25 23 0.6 0.07 90 29 YUB
Placer 19 26 1 0.05 150 26 ROS
Tehama 24 20 1 200 acres
unless reduced
by PM
200 21 WLW
Shasta 30 30 0.4 200 32 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 ***
Quiet weather on tap today as weak ridging moves in overhead. Reduced acreage today due to elevated PM issues in some spots...Active N/NW flow will develop on the North and West sides of the valley today with more afternoon sunshine. Fair to good mixing expected today...

24 Hour Outlook
*** Permissive Burn Day ***
Low pressure off the Southern California coast is expected to take shape over the next day and will provide some good mixing for the rest of the week during the daylight hours. However, no real threat for any major precip events are coming in for the rest of the month. A few sprinkles may dot the area early next week as a series of systems clip us by.
Mixing Height Discussion:
Valley: Mixing heights near 1,500 feet by mid-afternoon
Winds:
N/W Valley: N/NW 10-15 mph gusts near 20mph
S/E Valley: Variable early, becoming N/NW 2-8mph
Delta: Light & Variable 2-4 mph