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

Date:  30-Aug-14 Local Time:  08:09 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (°F) = 14 Wind Speed (mph)  = 7
500 millibar height (decameters) = 587 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.35
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 9.1
Allocation Equation: = 4849
   
ARB REVISED Basinwide Allocation _________________________________________ = 2500
Revised Allocation _________________________________________ = 2500
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 12 11 1 0.17 285 7 COL
Sutter 11 12 1 0.17 285 9 YUB
Butte 10 8 1 0.17 285 8 CIC-GRD
Yolo/Solano 10 8 1 0.15 275 9 DAV-WOO
Glenn 9 9 1 0.13 265 13 WLW
Sacramento 7 6 1 0.09 245 10 SAC
Yuba 11 12 1 0.07 235 9 YUB
Placer 10 10 1 0.05 225 9 ROS
Tehama 9 9 1 200 acres
unless reduced
by PM
200 13 WLW
Shasta 15 17 1 200 8 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***
The upper trof associated with the remnants of Marie has now moved over centCA with mid and high clouds pushing over south of the sac valley. Today, expect temps slightly warmer to normal in the lower to mid 90s, light and variable winds tending northerly then switching more towards SW near mid valley by early afternoon(about 2pm) and S-SW in s.valley, delta winds lighter SW 10-15mph, mixing hgts higher 3000ft by mid aftn, and fair dispersion by afternoon. .

***24 Hour + Outlook****
*** Permissive Burn Day***
Flat ridge builds into early next week, with Labor Day being the warmest in the mid 90s. Trof by end of the week.

Mixing Height Discussion:
Valley: Mixing heights will reach 3000 feet by afternoon.
Winds:
N. Valley: L+V 3-5mphtending northerly, then light northerly 5-10mph on the west side.
S. Valley: L+V 3-5mph, then switch from northerly to SW in mid valley by mid aftn. S.Valley is light southerly 3-5mph then light S-SW 5-8mph by aftn.
Delta: SW 10-15mph