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

Date:  23-Jul-16 Local Time:  07:18 AM Meteorologist:  Sue
Ag Burn Decision Above 3000 ft:  NO Burn Day    
A.M. Stability (F) = 18 Wind Speed (mph)  = 10
500 millibar height (decameters) = 591 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.4
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 9.1
Allocation Equation: = 6341
   
ARB REVISED Basinwide Allocation _________________________________________ = 3000
Revised Allocation _________________________________________ = 3000
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 6 7 1 0.17 370 10 COL
Sutter 8 8 1 0.17 370 12 YUB
Butte 10 6 1 0.17 370 7 CIC-GRD
Yolo/Solano 11 10 1 0.15 350 13 DAV-WOO
Glenn 10 9 1 0.13 330 10 WLW
Sacramento 2 2 1 0.09 290 4 SAC
Yuba 8 8 1 0.07 270 12 YUB
Placer 8 8 1 0.05 250 8 ROS
Tehama 10 9 1 200 acres
unless reduced
by PM
200 10 WLW
Shasta 10 4 1 200 7 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 ***
The wake of the passing trough keeps the upper-level westerlies moderate over northern CA today, and northerly transport winds into the valley. Temperatures are increasing, stability is high and dispersion is deteriorating.


24hr Outlook
*** Permissive Burn Day / Restricted Field Day***
The high pressure will be affecting the region, keeping temperatures above normal, and light and variable winds. A second wave of high pressure system is expected to build over the central US on Monday, strengthening and affecting the entire California next week, resulting in dry, warm, and poor dispersion conditions all week.
Mixing Height Discussion:
North Valley: Mixing heights will reach above 3,000 feet by afternoon.
Winds:
Valley: N 10-15 mph, gusts up to 20 in the morning.
Delta: W/NW 5-10 mph.