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

Date:  24-Mar-19 Local Time:  06:37 AM Meteorologist:  Mims
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Good)    
A.M. Stability (°F) = 4 Wind Speed (mph)  = 3
500 millibar height (decameters) = 560 Average Rainfall (in) = 0.12
Meteorological (MET) Factor   = 0.4
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 7.4
Allocation Equation: = 7479
   
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 5 5 1 0.17 200 4 COL
Sutter 9 8 1 0.17 200 11 YUB
Butte 6 5 1 0.17 200 7 CIC-GRD
Yolo/Solano 5 5 1 0.15 200 4 DAV-WOO
Glenn 6 7 1 0.13 200 4 WLW
Sacramento 5 4 1 0.09 200 4 SAC
Yuba 9 8 1 0.07 200 11 YUB
Placer 7 4 1 0.05 200 6 ROS
Tehama 5 4 1 200 acres
unless reduced
by PM
200 7 RBL
Shasta 13 12 1 200 22 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 ***
The break in the action continues as weak ridging keeps storm activity at bay for one more day. Mostly sunny early will become increasing cloudy as our next weather system approaches. Winds stay light southerly with adequate mixing and air quality since we got a good cleanout from the previous system. Caution for damp fields again.

24hr Outlook
*** WET DAY ***
We resume the water works tomorrow with another cold front moving in. Scattered showers for Tuesday with yet another wet wave due in Tuesday night into Wednesday. This activity ends Thursday with one more due in Saturday.
Mixing Height Discussion:
Valley: Mixing heights near 2500 feet.
Winds:
Valley: Light and variable to 5 mph early, then S/SW 2-6 mph
Delta: Light and variable to 5 mph.