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

Date:  2-Sep-20 Local Time:  06:43 AM Meteorologist:  Mims
Ag Burn Decision Above 3000 ft:  NO BURN DAY    
A.M. Stability (F) = 20 Wind Speed (mph)  = 5
500 millibar height (decameters) = 595 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.5
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 20.0
Allocation Equation: = 2463
   
ARB REVISED Basinwide Allocation _________________________________________ = 0
Revised Allocation _________________________________________ = 0
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 24 26 1 0.17 0 14 COL
Sutter 34 44 1 0.17 0 16 YUB
Butte 26 34 1 0.17 0 21 CIC-GRD
Yolo/Solano 34 43 1 0.15 0 14 DAV-WOO
Glenn 21 31 1 0.13 0 19 WLW
Sacramento 31 34 1 0.09 0 18 SAC
Yuba 34 44 1 0.07 0 16 YUB
Placer 33 37 1 0.05 0 20 ROS
Tehama 11 14 0.6 200 acres
unless reduced
by PM
0 29 RBL
Shasta 9 10 1 0 26 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:
*** Due to current circumstances, forecasts may experience delays. We apologize for any inconvenience. Should you have any questions email the forecaster at armet1@arb.ca.gov or leave a message at 916-322-6014 and someone will get back to you ***

*** Fire updates: ***
LNU Lightning Complex 375,209ac @74%
August Lightning Complex 261,204ac @20%
Butte/Tehama/Glenn Lightning Complex 61,609ac @40%
https://www.fire.ca.gov/
https://inciweb.nwcg.gov/

*** NO Burn Day ***
*** Forecast AQIs in the USG range of 101-150 AQI ***

Better air quality for a change as containment on the SCU and LMU fires is paying off. Thank you firefighters. Strengthening delta winds, which are much cleaner now, are combining with upper level offshore flow to put us in the proverbial eye of the smoke storm. Still a lot of smoke and haze above the inversion so enjoy the brief reprieve while it lasts since this should be the coolest, less smoky day this week. Still a no burn day since all things being equal, we go right back into the poor air quality as inversions break and winds shift.


24hr Outlook
*** NO Burn day ***
*** Forecast AQIs in the USG range of 101-150 AQI ***

We get less of a delta influence tomorrow as it slowly erodes ahead of the well-advertised heat wave on tap for Labor Day Weekend. This will continue our no burn conditions through most of next week with widespread temperatures topping 105 degrees for afternoon highs early in the week. More smoke should move in with the weaker onshore gradients expected.
Mixing Height Discussion:
Valley: Mixing heights will reach 3000 feet by afternoon
Winds:
Valley: Southerly 5-15 mph.
Delta: W/SW 10-20 mph, gusting to 25 mph