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

Date:  20-Oct-17 Local Time:  07:41 AM Meteorologist:  Gerber
Ag Burn Decision Above 3000 ft:  Permissive Burn Day    
A.M. Stability (F) = -1 Wind Speed (mph)  = 10
500 millibar height (decameters) = 555 Average Rainfall (in) = 0.42
Meteorological (MET) Factor   = 0.85
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 5.0
Allocation Equation: = 9309
   
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 8 7 1 27 13 3 COL
Butte 13 13 1 53 14 6 CIC-GRD
Glenn 12 14 1 58 12 2 WLW
Placer 5 7 1 11 0 4 ROS
Sacramento 5 6 1 16 0 -2 SAC
Sutter 7 7 1 23 14 3 YUB
Yolo/Solano 8 7 1 23 13 11 DAV-WOO
Yuba 7 7 1 23 14 3 YUB
Tehama - - 1 - - - RBL
Shasta 22 23 1 48 16 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:
*** WET Day ***
South winds up the valley today in the wake of our overnight FROPA. Overnight precip ranged from .10 -.65...A few morning showers are still possible in the extreme North Valley however for the rest of us mostly sunny and cool.
Still take caution when burning.

24 Hour Outlook
*** Wet Day ***
Some filtered sunshine for Saturday as another weather system passes through however wet dynamics will be well to the North. High pressure fills in rapidly for Sunday and into early next week with afternoon temps returning into the 80s possible 90s by Wednesday. Stability and dispersion will take a hit resulting in some AQI issues likely by then.

Mixing Height Discussion:
Mixing heights over 3,000 feet late morning.
Winds:
Valley: S/SW 5-10 mph
Delta: SW/W 10-15 mph

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







Data Table
20-Oct-17 Date
07:41 AM Local Time
Gerber Meteorologist
Permissive Burn Day Ag Burn Decision Above 3000 ft
-1 A.M. Stability (F)
10 Wind Speed (mph)
555 500 millibar height (decameters)
0.42 Average Rainfall (in)
0.85 Meteorological (MET) Factor
5.0 Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5)
9309 Allocation Equation:
2000 ARB/CCO REVISED Basinwide Allocation