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

Date:  3-Mar-15 Local Time:  07:13 AM Meteorologist:  Branz
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 6 Wind Speed (mph)  = 13
500 millibar height (decameters) = 560 Average Rainfall (in) = 0.01
Meteorological (MET) Factor   = 0.8
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 10.3
Allocation Equation: = 10892
   
ARB REVISED Basinwide Allocation _________________________________________ = 4000
Revised Allocation _________________________________________ = 3920
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 7 8 1 0.17 540 9 COL
Sutter 6 6 1 0.17 540 7 YUB
Butte 5 3 1 0.17 540 5 CIC-GRD
Yolo/Solano 9 8 1 0.15 500 11 DAV-WOO
Glenn 7 3 1 0.13 460 3 WLW
Sacramento 6 4 1 0.09 380 10 SAC
Yuba 6 6 1 0.07 340 7 YUB
Placer 8 9 1 0.05 300 7 ROS
Tehama 7 3 1 200 acres
unless reduced
by PM
200 3 WLW
Shasta 19 19 0.6 120 30 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 low responsible for yesterday\'s scattered showers has moved south of our area, setting up a relatively strong pressure gradient from north to south as high pressure tries to rebuild. Expect northerly winds to increase by later this morning, reaching their peak by mid-afternoon. Wind speeds should remain near or below restricted criteria, so use plenty of caution if burning today.

24 Hour Outlook
***Permissive Burn Day ***
High pressure will continue to build over the state through the week, reaching its peak strength on Friday. Expect mainly light winds, warm afternoon temps, and deteriorating air quality through the forecast period. The ridge may weaken some by early next week.
Mixing Height Discussion:
Valley: Mixing heights will reach 2,000 ft by afternoon.
Winds:
Valley: North to northwesterly 10-15 mph with gusts to 20 mph possible, especially in the North and West Valley.
Delta: North to northwesterly 10-15 mph.