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

Date:  15-Jul-18 Local Time:  06:41 AM Meteorologist:  Gerber
Ag Burn Decision Above 3000 ft:  No Burn Day    
A.M. Stability (°F) = 20 Wind Speed (mph)  = 7
500 millibar height (decameters) = 590 Average Rainfall (in) = 0.00
Meteorological (MET) Factor   = 0.25
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 6.3
Allocation Equation: = 4212
   
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 8 8 1 0.17 200 3 COL
Sutter 11 9 1 0.17 200 7 YUB
Butte 14 21 1 0.17 200 9 CIC-GRD
Yolo/Solano 6 3 1 0.15 200 3 DAV-WOO
Glenn 6 4 1 0.13 200 0 WLW
Sacramento 6 6 1 0.09 200 3 SAC
Yuba 11 9 1 0.07 200 7 YUB
Placer 8 7 1 0.05 200 6 ROS
Tehama 10 12 1 200 acres
unless reduced
by PM
200 6 RBL
Shasta 21 23 1 200 17 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***
Little change today as high pressure remains anchored over the state with a weak shortwave passing through the CA/OR border. Both of these systems helped to draw in a decent delta flow allowing the southern valley this morning to cool off near 60. The Stoney Fire near Chico is at 956 acres with 65% containment as of Saturday nigh, so some local smoke impacts are possible from that fire. Overall...the previous message holds true for today...poor dispersion and burning is discouraged.

24hr Outlook
***Permissive Burn Day ***
High pressure will strengthen further as we go into the upcoming week. Little change is expected with temps over 100 and poor dispersion expected.

Mixing Height Discussion:
Valley: Mixing heights will reach 2000-2500 feet by afternoon.
Winds:
North Valley: L/V 2-4 mph becoming S/SE 10-15 mph by afternoon.
South Valley: L/V 2-4 mph becoming S/SW 10-15 mph by afternoon.
Delta: W to SW 10-20 mph.