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

Date:  3-Dec-16 Local Time:  08:08 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  Marginal Burn Day    
A.M. Stability (F) = 11 Wind Speed (mph)  = 8
500 millibar height (decameters) = 576 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.45
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 13.6
Allocation Equation: = 5039
   
ARB REVISED Basinwide Allocation _________________________________________ = 2000
Revised Allocation _________________________________________ = 1720
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 2 0 1 0.17 200 1 COL
Sutter 2 2 1 0.17 200 15 YUB
Butte 19 13 0 0.17 0 39 CIC-GRD
Yolo/Solano 3 4 1 0.15 200 9 DAV-WOO
Glenn 5 8 1 0.13 200 6 WLW
Sacramento 5 5 1 0.09 200 14 SAC
Yuba 2 2 1 0.17 200 15 YUB
Placer 0 -1 1 0.05 200 9 ROS
Tehama 3 4 1 200 acres
unless reduced
by PM
200 5 RBL
Shasta 14 12 0.6 120 29 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 ***
High pressure aloft and weak surface gradients has brought back the cold morning temps in the mid 30s in the valley and light northerly winds only 5-15mph, much different than the last two days of gusts 35mph.
High PM values have curtailed acre alloc for Butte and Shasta counties.
Today expect clear skies, temps warmer in the low to mid 60s, valley winds lighter northerly 5-15mph stronger in the n+wValley and lighter in the s+eValley, delta winds also L+V 3-5mph tending N-NE 5-10mph by aftn, and low mixing hgts only 1000-1200ft. Dispersion is poor.

24hr Outlook
*** Permissive Burn day***
Weak trof will move across the pacNW towards Sun through Tue, bringing chances of rain and snow in the mtns. Much colder temps next week. Next wetting system will be Thur/Fri.
Mixing Height Discussion:
Valley: Mixing heights will reach 1000-1200 feet by afternoon.
Winds:
N+W Valley: L+V 3-5mph, then lighter 5-15mph, possible gust 20mph by aftn.
S+E Valley: L+V 3-5mph, then lighter 5-10mph by aftn.
Delta: L+V 3-5mph then N-NE 5-10mph by mid aftn.