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

Date:  24-Aug-16 Local Time:  07:30 AM Meteorologist:  Mims
Ag Burn Decision Above 3000 ft:  Marginal Burn Day    
A.M. Stability (F) = 20 Wind Speed (mph)  = 5
500 millibar height (decameters) = 589 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.15
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 7.2
Allocation Equation: = 3979
   
ARB REVISED Basinwide Allocation _________________________________________ = 2000
Revised Allocation _________________________________________ = 1800
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 11 10 1 0.17 200 12 COL
Sutter 9 7 1 0.17 200 10 YUB
Butte 14 13 1 0.17 200 9 CIC-GRD
Yolo/Solano 2 2 1 0.15 200 2 DAV-WOO
Glenn 8 6 1 0.13 200 8 WLW
Sacramento 7 5 1 0.09 0 8 SAC
Yuba 9 7 1 0.07 200 10 YUB
Placer 5 3 1 0.05 200 4 ROS
Tehama 8 6 1 200 acres
unless reduced
by PM
200 8 WLW
Shasta 13 9 1 200 10 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 ozone forecast EXCEEDS 100 AQI. It is a No-Burn day only for the SFONA affected zones***
Not much change! High pressure with a touch of toughing continues over the region. This can be as seen through the cooler but stable air as onshore flow brings in marine air, but the inversion pattern will keep mixing at a minimum (high AQI). That being said, the flow aloft remains more northerly so less haze again. Caution remains for stable air this afternoon and quickly collapsing mixing heights.

24hr Outlook
*** Permissive Burn Day. ***
More of the same tomorrow as weak troughing brings a subtle cool down going into the weekend. Less certainty overall as guidance keep some troughing over the region, but the extent to which is in question.
Mixing Height Discussion:
Valley: Mixing heights will reach over 1,500 feet by afternoon.
Winds:
Valley: South-Southeasterly 2-7 mph
Delta: Southwesterly 5-15mph.