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

Date:  21-Sep-18 Local Time:  07:33 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  Marginal Burn Day    
A.M. Stability (F) = 18 Wind Speed (mph)  = 8
500 millibar height (decameters) = 583 Average Rainfall (in) = 0.00
Meteorological (MET) Factor   = 0.3
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 10.2
Allocation Equation: = 4196
   
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 9 8 1 17 9 8 COL
Butte 11 11 1 18 1 8 CIC-GRD
Glenn 8 7 1 21 8 7 WLW
Placer 9 13 1 15 4 8 ROS
Sacramento 8 11 1 16 4 9 SAC
Sutter 13 10 1 21 21 16 YUB
Yolo/Solano 10 10 1 21 8 13 DAV-WOO
Yuba 13 10 1 21 21 16 YUB
Tehama 3 5 1 8 22 5 RBL
Shasta 17 19 1 25 6 19 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 ***
*** Wait until closer to noon to burn ***

Flat upper ridge shifts inland as a weak upper trough moves along the PacNW, bringing strong morning inversions, lighter valley winds shifting southerly by afternoon, and still warm temps above normal.
Today, expect clear skies with some smoke and haze, temps in the mid to upper 90s, valley winds light and variable 3-5mph to start, then light southerly 5-15mph by aftn, delta winds light onshore SW 4-8mph, then stronger gust 15-20mph by mid aftn, and mixing hgts 1800-2000ft by noon and higher 2500-2800ft by mid-late aftn.
Take caution if burning.

24hr Outlook
*** Permissive Burn Day ***
Weak upper trof passes by over the weekend, bringing temps to near normal, and light onshore southerly winds. But, high pressure should return early next week with more warming expected.
Mixing Height Discussion:
Valley: Mixing heights near 1800-2800 feet by early afternoon.
Winds:
Valley: L+V 3-5mph, then light southerly 5-15mph by mid afternoon.
Delta: Light SW 4-8mph, then stronger gust 15-20 mph by mid aftn.

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







Data Table
21-Sep-18 Date
07:33 AM Local Time
Lancero Meteorologist
Marginal Burn Day Ag Burn Decision Above 3000 ft
18 A.M. Stability (F)
8 Wind Speed (mph)
583 500 millibar height (decameters)
0.00 Average Rainfall (in)
0.3 Meteorological (MET) Factor
10.2 Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5)
4196 Allocation Equation:
2000 ARB/CCO REVISED Basinwide Allocation