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

Date:  11-Feb-16 Local Time:  08:03 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 17 Wind Speed (mph)  = 6
500 millibar height (decameters) = 579 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.2
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 13.6
Allocation Equation: = 3813
   
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 5 1 0.17 200 6 COL
Sutter 19 21 1 0.17 200 21 YUB
Butte 13 16 1 0.17 200 16 CIC-GRD
Yolo/Solano 12 12 1 0.15 200 13 DAV-WOO
Glenn - - 1 0.13 200 - WLW
Sacramento 17 18 1 0.09 200 20 SAC
Yuba 19 21 1 0.07 200 21 YUB
Placer 11 9 1 0.05 200 9 ROS
Tehama - - 1 200 acres
unless reduced
by PM
200 - WLW
Shasta 22 25 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 ***
The upper ridge over the west has weakened even more today as a weak pacific system moves to the pacNW, bringing only high clouds, slightly lower temps(still 5-10degrees above normal), with showers only near the OR border.
Today, expect temps again in the upper 60s to lower 70s, light and variable winds 3-5mph tending southerly 5-8mph by aftn, delta winds light N-NE 4-7mph, slightly higher mixing hgts at 1000-1300ft, and fair-poor dispersal conditions. Again, recommend minimal burning today.

24hr Outlook
*** Permissive Burn Day***
More of the same as Ridge flattens a bit and pushes eastward towards Fri, as a weak pacific storm system pushes in the PacNW. Next precip chances is by Wed and Thur.

Mixing Height Discussion:
Valley: Mixing heights near 1000-1,200 feet this afternoon.
Winds:
Valley: L+V 3-5mph, tending southerly 5-8 mph
Delta:N-NE 4-7 mph