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

Date:  31-May-20 Local Time:  07:21 AM Meteorologist:  Gerber
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Good)    
A.M. Stability (F) = -2 Wind Speed (mph)  = 6
500 millibar height (decameters) = 570 Average Rainfall (in) = 0.11
Meteorological (MET) Factor   = 0.7
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 3.4
Allocation Equation: = 8995
   
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 2 0 1 0.17 370 2 COL
Sutter 5 6 1 0.17 370 5 YUB
Butte 4 4 1 0.17 370 3 CIC-GRD
Yolo/Solano 3 3 1 0.15 350 3 DAV-WOO
Glenn 6 6 1 0.13 330 0 WLW
Sacramento 2 0 1 0.09 290 4 SAC
Yuba 5 6 1 0.07 270 5 YUB
Placer 4 2 1 0.05 250 4 ROS
Tehama 4 3 1 200 acres
unless reduced
by PM
200 3 RBL
Shasta 3 0 1 200 3 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 as soon as possible ***

*** Permissive Burn Day ***

The deep closed low that brought the active weather on Saturday has since moved through. Most of us just receiving a sprinkle with some thunder and lightning mixed in, while most of the North and East sides of the valley and foothills experienced some persistent rains on Saturday. A few elevated showers and thunderstorms today as some instability lingers under a broad region of SW flow aloft. Dispersion will remain good today with increasing SW flow by afternoon.

24hr Outlook
*** Permissive Burn Day ***
This week a broad low pressure circulation will remain off the Southern California coast with SW to SE flow overhead and warming temps near 100 by Tuesday and Wednesday. By the weeks end a Gulf of Alaska system will dig south and kick the SoCal low out and introduce the potential for more showers and thunderstorms by Friday and the weekend. Dispersion will remain good throughout the extended.
Mixing Height Discussion:
Valley: Mixing heights will reach 3,000 feet.
Winds:
Valley: L/V this morning becoming SE/SW 5-10 mph
Delta: W/SW 10-15 mph