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

Date:  20-Feb-17 Local Time:  07:37 AM Meteorologist:  Mims
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Good)    
A.M. Stability (F) = -2 Wind Speed (mph)  = 26
500 millibar height (decameters) = 552 Average Rainfall (in) = 0.26
Meteorological (MET) Factor   = 1
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 6.7
Allocation Equation: = 10254
   
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 2 0 1 0.17 200 3 COL
Sutter 8 8 1 0.17 200 9 YUB
Butte 7 7 1 0.17 200 7 CIC-GRD
Yolo/Solano 6 4 1 0.15 200 5 DAV-WOO
Glenn 9 0 1 0.13 200 8 WLW
Sacramento 9 10 1 0.09 200 9 SAC
Yuba 8 8 1 0.07 200 9 YUB
Placer 0 1 1 0.05 200 -2 ROS
Tehama 2 3 1 200 acres
unless reduced
by PM
200 4 RBL
Shasta 8 8 1 200 15 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:
*** WET Day ***
The atmospheric river is here with heavy rain and winds reported throughout the valley. Flooding continues to be the main concern as we are only hours into an all day event. 1-3 inches of rain on the valley floor, but a much larger amount (4-6 inches) expected in the foothills and mountains. Winds and the unstable atmosphere will keep the dispersion and air quality good.

24hr Outlook
*** WET Day ***
Since my internet is down this will be quick. Not much change in thinking,Tuesday and Wednesday will be showery then a break on both Thursday and Friday before another system keeps the record rainfall pace going into next weekend.
Mixing Height Discussion:
Valley: Mixing heights will be limited to 1000-1500 feet.
Winds:
Valley:S/SE 10-25 mph, gusting to 40mph
Delta: S/SE 10-20 mph, gusting to 40mph