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

Date:  2-Aug-21 Local Time:  07:00 AM Meteorologist:  Gerber
Ag Burn Decision Above 3000 ft:  No Burn Day    
A.M. Stability (°F) = 21 Wind Speed (mph)  = 10
500 millibar height (decameters) = 590 Average Rainfall (in) = 0.0
Meteorological (MET) Factor   = 0.4
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 4.9
Allocation Equation: = 4467
   
ARB REVISED Basinwide Allocation _________________________________________ = 2000
Revised Allocation _________________________________________ = 2000
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 6 1 0.17 200 4 COL
Sutter 12 5 1 0.17 200 7 YUB
Butte 6 6 1 0.17 200 3 CIC-GRD
Yolo/Solano 0 0 1 0.15 200 0 DAV-WOO
Glenn 7 6 1 0.13 200 5 WLW
Sacramento 3 4 1 0.09 200 3 SAC
Yuba 12 5 1 0.07 200 7 YUB
Placer 8 7 1 0.05 200 7 ROS
Tehama 7 8 1 200 acres
unless reduced
by PM
200 6 RBL
Shasta 7 4 1 200 4 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 ***
*** Ozone Fcst EXCEEDS 100 (101 AQI). No Burn for SFONA affected districts, counties, and zones ***
*** Fire Update: Dixie Fire ~248,820 acres @ 35% containment.

Not much change from Sunday...Pleasantly quiet weather wise with seasonal temps, sunny to hazy skies and good mixing. A developing weak trof just off the coast will continue to deepen the marine layer along the coast and help keep the Delta flow up the valley today and for much of the week.
24hr Outlook
*** Ozone Fcst EXCEEDS 100 (119 AQI). No Burn for SFONA affected districts, counties, and zones ***
*** Permissive Burn Day ***

For much of the week the state will remain sandwiched in between high pressure over the center of the country and a weak EPAC trof. Dry SW flow aloft will help to keep the monsoonal moisture East of the crest. Good mixing will continue at the surface too as the Delta flow will remain up the valley.
Mixing Height Discussion:
Valley: Mixing heights near 3000 feet by afternoon.
Winds:
Valley: S to SW 5-15 mph
Delta: W to SW 10-20 mph gust 25-35 mph.