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

Date:  24-Apr-14 Local Time:  08:02 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Good)    
A.M. Stability (°F) = -3 Wind Speed (mph)  = 10
500 millibar height (decameters) = 565 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.9
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 4.1
Allocation Equation: = 14169
   
ARB REVISED Basinwide Allocation _________________________________________ = 5000
Revised Allocation _________________________________________ = 5000
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 6 5 1 0.17 710 5 COL
Sutter 4 4 1 0.17 710 5 YUB
Butte 4 4 1 0.17 710 3 CIC-GRD
Yolo/Solano 3 2 1 0.15 650 3 DAV-WOO
Glenn 2 0 1 0.13 590 1 WLW
Sacramento 4 5 1 0.09 470 2 SAC
Yuba 4 4 1 0.07 410 5 YUB
Placer 5 5 1 0.05 350 6 ROS
Tehama 2 0 1 200 acres
unless reduced
by PM
200 1 WLW
Shasta 9 12 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:
***This page will be unavailable on Saturday 4/26 and Sunday 4/27 due to a planned power outage***
***A 3-day forecast will be provided on Friday, 4/25.***

***Permissive Burn Day****
Low system off the coast of BC with trof along pacNW into norCal, bringing some showers but remaining in northern regions, but possible showers by eastern foothills by late aftn eve. Today expect P/C - M/C skies, southerly winds 10-15mph in the valley, stronger onshore SW 15-20mph gusting 25mph in the deltas, mild temps in the low to mid 70s, and good mixing hgts reaching 3000ft+ by early aftn. Good dispersal conditions. .

24hr Outlook:
***Possible WET or Permissive Burn Day***

Low pressure system by Fri, with rainshowers and cooler temperatures on Friday and Saturday. Ridge begins to build on Sunday.
Mixing Height Discussion:
Valley: Mixing heights will reach over 3000 feet + by early afternoon.
Winds:
Valley: Southerly 10-15mph throughout the valley.
Delta: Stronger onshore SW 15-20mph gusting 25mph by noon.