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

Date:  17-Dec-14 Local Time:  07:44 AM Meteorologist:  Branz
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Good)    
A.M. Stability (F) = -6 Wind Speed (mph)  = 10
500 millibar height (decameters) = 553 Average Rainfall (in) = .57
Meteorological (MET) Factor   = 0.9
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 4.6
Allocation Equation: = 10282
   
ARB REVISED Basinwide Allocation _________________________________________ = 2000
Revised Allocation _________________________________________ = 2000
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 6 1 0.17 200 4 COL
Sutter 6 5 1 0.17 200 0 YUB
Butte 3 5 1 0.17 200 3 CIC-GRD
Yolo/Solano 5 5 1 0.15 200 7 DAV-WOO
Glenn 6 4 1 0.13 200 3 WLW
Sacramento 3 2 1 0.09 200 1 SAC
Yuba 6 5 1 0.07 200 0 YUB
Placer 5 4 1 0.05 200 6 ROS
Tehama 6 4 1 200 acres
unless reduced
by PM
200 3 WLW
Shasta 14 14 1 200 10 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:
*** Wet Day ***
An upper trough is moving through the North State this morning, which brought widespread rain the the Valley overnight. Expect showers to continue off and on through the day as this system moves through. Skies will remain cloudy and winds will remain southerly through the afternoon.

24 Hour + Outlook
*** WET DAY ***
A brief ridge will move over the area on Thursday, leading to light winds and morning fog. Expect another chance of precip for Friday and Saturday as another weak trough moves through. A strong ridge will start to build over the area early next week, which could remain over the North State through the holiday.

Mixing Height Discussion:
Valley: Mixing heights will reach 1000-1500 feet.
Winds:
Valley: South to southeasterly 8-12 mph.
Delta: South to southwesterly 8-12 mph.