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

Date:  18-Sep-14 Local Time:  07:29 AM Meteorologist:  Branz
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Good)    
A.M. Stability (°F) = -10 Wind Speed (mph)  = 12
500 millibar height (decameters) = 574 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 1
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 5.9
Allocation Equation: = 10133
   
ARB/CCO REVISED Basinwide Allocation _________________________________________ = 2500
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 11 9 1 32 11 9 COL
Butte 8 9 1 20 11 4 CIC-GRD
Glenn 9 11 1 35 18 4 WLW
Placer 12 16 1 67 6 8 ROS
Sacramento 3 3 1 10 9 2 SAC
Sutter 10 12 1 19 15 7 YUB
Yolo/Solano 1 0 1 2 23 8 DAV-WOO
Yuba 10 12 1 19 15 7 YUB
Tehama 9 11 1 35 18 4 WLW
Shasta 13 10 1 34 7 6 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***
An upper trough will push ashore today, bringing increased southerly flow and low AM stability thanks to cold air aloft. This unstable atmosphere will lead to a slight chance of showers and thunderstorms this afternoon, with better chances in the far north. Expect skies to become partly to mostly cloudy, with more cloud coverage in the north, which may limit mixing a bit. Smoke from the King Fire (which grew to almost 71K acres overnight) will move northeast away from the area.

24 Hour + Outlook
*** Permissive Burn Day***
The trough will weaken and sink southward on Friday, setting up a downslope wind pattern that will bring smoke from the King Fire into the south Valley. This flow pattern will continue on Saturday as the upper trough cuts off into a low over Southern California. Expect upslope flow to resume on Sunday as high pressure builds in, which will persist through mid-week.

Mixing Height Discussion:
Valley: Mixing heights will reach near 3000 feet by afternoon.
Winds:
Valley: South to southeasterly 10-15 mph.
Delta: West to southwesterly 10-15 mph with gusts to 25 mph this afternoon.
Complaints: Col Sut But Yol Gle Sac Yub Pla Teh Sha Total
15-Sep-14 0 0 0 0 0 0 0 0 0 0 0
16-Sep-14 0 0 0 0 0 0 0 0 0 0 0
17-Sep-14 0 0 0 0 0 0 0 0 0 0 0







Data Table
18-Sep-14 Date
07:29 AM Local Time
Branz Meteorologist
Permissive Burn Day (Good) Ag Burn Decision Above 3000 ft
-10 A.M. Stability (°F)
12 Wind Speed (mph)
574 500 millibar height (decameters)
0 Average Rainfall (in)
1 Meteorological (MET) Factor
5.9 Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5)
10133 Allocation Equation:
2500 ARB/CCO REVISED Basinwide Allocation