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

Date:  18-Apr-15 Local Time:  07:46 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 15 Wind Speed (mph)  = 6
500 millibar height (decameters) = 575 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.25
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 8.9
Allocation Equation: = 7612
   
ARB REVISED Basinwide Allocation _________________________________________ = 3500
Revised Allocation _________________________________________ = 3500
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 8 9 1 0.17 455 12 COL
Sutter 6 7 1 0.17 455 9 YUB
Butte 4 4 1 0.17 455 6 CIC-GRD
Yolo/Solano 8 7 1 0.15 425 12 DAV-WOO
Glenn 7 5 1 0.13 395 6 WLW
Sacramento 12 10 1 0.09 335 12 SAC
Yuba 6 7 1 0.07 305 9 YUB
Placer 5 4 1 0.05 275 6 ROS
Tehama 7 5 1 200 acres
unless reduced
by PM
200 6 WLW
Shasta 17 17 1 200 7 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 ***
** Stronger stability in the southern valley by 20F, due to L+V winds and clear skies. so WAIT closer til noon. **
No significant changes as the High pressure is over the west, bringing warm temps in the upper 80s, with isold showers over the sierras. Today, expect above normal temps in the upper 80s, winds light and variable 3-5mph, then light southerly 4-8mph by late aftn, delta winds more typical SW 5-10mph, mixing hgts from 2,000-3,000ft, and fair to good mixing.

24 Hour Outlook
*** PERMISSIVE Burn DAY ***
Same ol same ol. Again 10-15F warmer than normal temps in the upper 80s. Slight chance of mtn showers on Sun and Mon. Next trof system by Tue-Thur with showers all around.
Mixing Height Discussion:
N. Valley: 2,000ft by mid aftn.
S. Valley: 3,000ft by mid aftn.
Winds:
Valley:L+V 3-5mph throughout the day, then light southerly 4-8mph by aftn.
Delta: Light SW 5-10mph.