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

Date:  15-Aug-20 Local Time:  06:48 AM Meteorologist:  Mims
Ag Burn Decision Above 3000 ft:  Marginal Burn Day    
A.M. Stability (F) = 10 Wind Speed (mph)  = 10
500 millibar height (decameters) = 592 Average Rainfall (in) = 0.0
Meteorological (MET) Factor   =
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 6.6
Allocation Equation: =
   
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 7 6 1 0.17 200 5 COL
Sutter 14 16 1 0.17 200 11 YUB
Butte 7 8 1 0.17 200 6 CIC-GRD
Yolo/Solano 7 6 1 0.15 200 6 DAV-WOO
Glenn 8 10 1 0.13 200 8 WLW
Sacramento 6 5 1 0.09 200 7 SAC
Yuba 14 16 1 0.07 200 11 YUB
Placer 7 6 1 0.05 200 5 ROS
Tehama 5 6 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:
*** 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 ***

*** NWS Excessive Heat Warning effective through Wednesday night ***
*** The Ozone Fcst EXCEEDS 100AQI(115). It is a NO Burn for the SFONA affected districts counties and zones ***

*** Permissive Burn Day ***
Not much change, as can be expected in the midst of a heat wave. Essentially, we have Las Vegas weather without the entertainment. Temperatures should reach 108-111 for afternoon highs making this one of the warmer days. Mixing and air quality remain challenged since a very stable atmosphere.is overhead. Isolated thunderstorms over the Sierras and a few monsoonal clouds moving through will be the only contrast during another hot, hazy afternoon.


24hr Outlook
*** NWS Excessive Heat Warning in effect ***
*** The Ozone Fcst EXCEEDS 100AQI(122). It is a NO Burn for the SFONA affected districts counties and zones ***
*** Permissive Burn Day ***
Same ole, same ole as our near record heat continues through most of next week. Cooler near the coast and in the higher terrain, for the rest of us keep the air conditioning handy. AQI and dispersion will be challenged through this heat spell.
Mixing Height Discussion:
Valley: Mixing heights near 2000 feet by afternoon.
Winds:
Valley: L+V 3-5mph early, then Southerly 5-10mph, gusting to 15 mph by aftn
Delta: SW 5-15mph.
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