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

Date:  25-Jun-17 Local Time:  07:35 AM Meteorologist:  Mims
Ag Burn Decision Above 3000 ft:  No Burn Day    
A.M. Stability (F) = 11 Wind Speed (mph)  = 10
500 millibar height (decameters) = 588 Average Rainfall (in) = 0.00
Meteorological (MET) Factor   = 0.55
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 6.1
Allocation Equation: = 5994
   
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 7 7 1 0.17 200 1 COL
Sutter 5 6 1 0.17 200 1 YUB
Butte 13 11 1 0.17 200 9 CIC-GRD
Yolo/Solano 6 5 1 0.15 200 0 DAV-WOO
Glenn 4 5 1 0.13 200 1 WLW
Sacramento 8 7 1 0.09 200 3 SAC
Yuba 5 6 1 0.07 200 1 YUB
Placer 7 6 1 0.05 200 3 ROS
Tehama 12 12 1 200 acres
unless reduced
by PM
200 12 RBL
Shasta 13 14 1 200 14 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 ***
Last day of valley triples as low pressure brings more seasonable weather and better dispersion to most areas. After 10 days of this, good riddance! Most areas south of the Buttes will see upper 90s and much better air quality as marine air moves through the delta at a pretty good clip. North valley will still be hot, but not as. Mountain convection is a sure bet again with low pressure providing the the lift. Expect fair burning conditions and moderate air quality for most areas.

24hr Outlook
*** Permissive Burn Day***
More reasonable weather going forward from the arrival of weak low pressure waves through midweek. A healthy delta breeze and better dispersion should keep air quality moderate through this period.
Mixing Height Discussion:
Valley: Mixing heights near 2,500 feet by afternoon.
Winds:
Valley: Southerly 5-12mph.
Delta: Strong SW 15-20mph gust 25-30mph.