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

Date:  22-Oct-17 Local Time:  07:47 AM Meteorologist:  Mims
Ag Burn Decision Above 3000 ft:  Marginal Burn Day    
A.M. Stability (°F) = 13 Wind Speed (mph)  = 7
500 millibar height (decameters) = 585 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.35
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 9.4
Allocation Equation: = 5031
   
ARB/SMPC REVISED Basinwide Allocation _________________________________________ = 2000
District Yesterday's
24-Hr Avg
PM2.5
Yesterday's
PM2.5
(0-6 PST)
Reduction
Factor
Yesterday's
PM2.5
MAX
Hour of
Yesterday's
MAX
Avg PM2.5
(0-6 PST)
Conc Stn
Colusa 5 5 1 11 20 4 COL
Butte 8 10 1 17 20 7 CIC-GRD
Glenn 3 5 1 7 2 6 WLW
Placer 7 4 1 16 10 7 ROS
Sacramento 11 16 1 26 23 24 SAC
Sutter 8 11 1 21 20 9 YUB
Yolo/Solano 8 11 1 27 8 13 DAV-WOO
Yuba 8 11 1 21 20 9 YUB
Tehama 2 2 1 4 5 3 RBL
Shasta 15 13 1 35 13 12 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 ***
Still wet, but strengthening high pressure will make this the last day. The building ridge will bring temperatures some 5 to 10 degrees above normal today, with steadily increasing northerly winds. This will be the start of a trend that will take us into the 90s for afternoon highs in the coming days as some of the strongest late October high pressure builds in. This does come with consequences to our air quality and dispersion as inversions and strong winds will litmit mixing. Caution today for the aforementioned winds and damp fields

24 Hour Outlook
*** Permissive Burn or Restricted Fields Day ***
Surface winds will be increasing tomorrow in response to rapidly building high pressure. Stability and dispersion will take a hit as afternoon temperatures rise another 5 to 10 degrees and mixing decreases. High pressure should stick around most of the week, but its retrograde offshore will allow winds to be highlighted once again during the later half.

Mixing Height Discussion:
Mixing heights near 1,500 feet late morning.
Winds:
Valley: NW 3-10 mph
Delta: NW 3-10 mph

Complaints: Col Sut But Yol Gle Sac Yub Pla Teh Sha Total
19-Oct-17 0 0 0 0 0 0 0 0 0 0 0
20-Oct-17 0 0 0 0 0 0 0 0 0 0 0
21-Oct-17 0 0 0 0 0 0 0 0 0 0 0







Data Table
22-Oct-17 Date
07:47 AM Local Time
Mims Meteorologist
Marginal Burn Day Ag Burn Decision Above 3000 ft
13 A.M. Stability (°F)
7 Wind Speed (mph)
585 500 millibar height (decameters)
0 Average Rainfall (in)
0.35 Meteorological (MET) Factor
9.4 Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5)
5031 Allocation Equation:
2000 ARB/CCO REVISED Basinwide Allocation