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

Date:  1-May-16 Local Time:  07:33 AM Meteorologist:  Mims
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 8 Wind Speed (mph)  = 10
500 millibar height (decameters) = 567 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.65
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 6.1
Allocation Equation: = 7211
   
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 6 4 1 0.17 370 12 COL
Sutter 7 10 1 0.17 370 8 YUB
Butte 2 1 1 0.17 370 3 CIC-GRD
Yolo/Solano 6 6 1 0.15 350 6 DAV-WOO
Glenn - - 1 0.13 330 - WLW
Sacramento 5 5 1 0.09 290 6 SAC
Yuba 7 10 1 0.07 270 8 YUB
Placer 5 4 1 0.05 250 3 ROS
Tehama - - 1 200 acres
unless reduced
by PM
200 - WLW
Shasta 9 7 1 200 5 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 ***
North winds have decreased overnight as pressure gradients weakened in response to the upper lows continued southeastward movement. They should stay elevated at least the morning hours before becoming light this afternoon. Sunny skies and warm temperatures also continue under this weather pattern with decent dispersion expected.

24hr Outlook
*** Permissive Burn Day ***
A series of low pressure areas will keep temperatures tame and dispersion good across California this week. Some shower and thunderstorm activity will follow the lows, but as was previously stated most of the impacts will be to the higher elevations except towards the latter half of the week when clouds and showers become more widespread.
Mixing Height Discussion:
Valley: Mixing heights will reach 3000 feet by afternoon.
Winds:
Valley: North to northwesterly 7-20 mph early, becoming light 3-6 mph by this afternoon.
Delta: North to northeasterly 5-10 mph with gusts to 15mph this morning, becoming light 2-5mph late.