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

Date:  29-May-15 Local Time:  07:52 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 10 Wind Speed (mph)  = 6
500 millibar height (decameters) = 580 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.4
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 6.7
Allocation Equation: = 6097
   
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 11 15 1 0.17 370 9 COL
Sutter 7 5 1 0.17 370 8 YUB
Butte 6 5 1 0.17 370 7 CIC-GRD
Yolo/Solano 0 0 1 0.15 350 0 DAV-WOO
Glenn 5 6 1 0.13 330 6 WLW
Sacramento 8 5 1 0.09 290 6 SAC
Yuba 7 5 1 0.07 270 8 YUB
Placer 9 5 1 0.05 250 4 ROS
Tehama 5 6 1 200 acres
unless reduced
by PM
200 6 WLW
Shasta 13 9 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 ***
High pressure ridge over the west will peak today and tomorrow, bringing above normal temps and reaching the lower 90s in the valley. The coastal marine layer still strong and pushing into the deltas. Today, expect clear skies, temps to be in the low 90s, light southerly winds in the valley 5-10mph, delta winds stronger 10-15mph gusting 20-25mph, and lower mixing hgts at 2000ft. Dispersion will be fair.

24hr Outlook
***Permissive Burn Day***
Same: The high pressure will continue into Saturday until the next weak trough approaching the west coast around Sunday, bringing in back the cooler weather and possible unsettle weather over the coastal mountains over the northern end of the Valley.
Mixing Height Discussion:
Valley: Mixing heights over 2,000 feet by early afternoon.
Winds:
Valley:Southerly 5-10 mph
Delta: Stronger SW 10-15 mph gust 20-25mph.