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

Date:  23-Jan-18 Local Time:  07:57 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (°F) = 3 Wind Speed (mph)  = 7
500 millibar height (decameters) = 569 Average Rainfall (in) = 0.06
Meteorological (MET) Factor   = 0.6
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 7.9
Allocation Equation: = 7501
   
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 10 10 1 0.17 200 3 COL
Sutter 10 13 1 0.17 200 10 YUB
Butte 7 7 1 0.17 200 13 CIC-GRD
Yolo/Solano 13 16 1 0.15 200 6 DAV-WOO
Glenn 5 0 1 0.13 200 1 WLW
Sacramento 10 12 1 0.09 200 13 SAC
Yuba 10 13 1 0.07 200 10 YUB
Placer 3 5 1 0.05 200 3 ROS
Tehama 5 3 1 200 acres
unless reduced
by PM
200 5 RBL
Shasta 17 18 1 200 17 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 Permissive Burn Day ***
NorCal under upper level ridging, bringing some low patchy fog and only high cloudiness and light southerly winds.
Today expect p/c-m/c skies, normal temps in the low to mid 50s, light and variable winds 3-5mph, then light southerly 5-15mph, delta winds also light onshore 4-7mph, and mixing hgts slightly higher at 800-1200ft.

24 Hour Outlook
*** WET Day ***
Pacific storm approaching Wed into Fri, with most of the rain on Wed and shower conditions on Thu-Fri.
Mixing Height Discussion:
Mixing heights will reach near 800-1200 feet by afternoon.
Winds:
Valley: L+V 3-5mph, then light southerly 5-10mph, up to 15mph in the nValley.
Delta: L+V 3-5mph, then light SW 4-7mph.