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

Date:  15-Apr-14 Local Time:  07:49 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (°F) = 16 Wind Speed (mph)  = 5
500 millibar height (decameters) = 574 Average Rainfall (in) = 0.00
Meteorological (MET) Factor   = 0.2
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 13.4
Allocation Equation: = 6185
   
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 20 18 1 0.17 370 26 COL
Sutter 11 4 1 0.17 370 0 YUB
Butte 6 3 1 0.17 370 7 CIC-GRD
Yolo/Solano 10 7 1 0.15 350 14 DAV-WOO
Glenn 6 4 1 0.13 330 11 WLW
Sacramento 10 7 1 0.09 290 10 SAC
Yuba 11 4 1 0.07 270 0 YUB
Placer 12 10 1 0.05 250 15 ROS
Tehama 6 4 1 200 acres
unless reduced
by PM
200 11 WLW
Shasta 12 10 1 200 13 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****
Weak trof moved thru last night with another weak disturbance behind it, bringing only thin high clouds. Today, expect mostly sunny skies with light and variable winds 3-5mph then more organized northerly 5-10mph by mid afternoon, delta winds stronger onshore 10-15mph gusting 20mph by noon, temps slightly cooler in the upper 70s to lower 80s, and mixing hgts reaching 3000ft by mid afternoon.

24hr Outlook:
***Permissive Burn Day***

Ridge builds again for Wed with stronger northerly winds in the valley. Another weak system by Thursday and Friday with some precip in the mtn regions, then high pressure looks to return over the weekend.
Mixing Height Discussion:
Valley: Mixing heights will reach over 3,000 feet by afternoon.
Winds:
Valley: L+V 3-5mph, then slight northerly 5-10mph by mid afternoon.
Delta: Stronger SW 10-15mph, gusting 20mph by noon.