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

Date:  31-Jan-15 Local Time:  07:40 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 11 Wind Speed (mph)  = 16
500 millibar height (decameters) = 570 Average Rainfall (in) = 0.00
Meteorological (MET) Factor   = 0.65
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 4.6
Allocation Equation: = 7217
   
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 8 10 1 0.17 200 10 COL
Sutter 10 20 1 0.17 200 3 YUB
Butte 9 13 1 0.17 200 2 CIC-GRD
Yolo/Solano 6 6 1 0.15 200 3 DAV-WOO
Glenn 3 3 1 0.13 200 2 WLW
Sacramento 15 21 1 0.09 200 4 SAC
Yuba 10 20 1 0.07 200 3 YUB
Placer 16 13 1 0.05 200 9 ROS
Tehama 3 3 1 200 acres
unless reduced
by PM
200 2 WLW
Shasta 13 24 1 200 4 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:
*** RESTRICTED FIELD Day ***
Restricted Field day due to strong northerly winds throughout the valley and foothills.
Already NNE 38mph gust 45mph at the Sutter Buttes. Upper trof now over soCal moving east, while Ridge over norCal has brought tight surface gradients in the valley with gusty northerly valley winds 10-20mph with stronger gusts in the west side 25-30mph. Today expect clear skies, even warmer temps upper 60s in s.valley to mid 70s in n.valley, and mixing hgts have lowered to only reaching 1000ft.

24 Hour Outlook
*** Permissive Burn Day ***
Sunday should see lighter southerly winds 5-15mph with slight stronger on the south valley 10-15mph. Otherwise beautiful clear and warm days. Models still forecasting good chance of precip by end of next week.
Mixing Height Discussion:
Valley: Mixing heights near 1,000 feet by mid-afternoon
Winds:
N+W Valley: Strong Northerly 10-20 mph gusting 25-30mph
S+E Valley: Strong Northerly 10-15mph gusting 20-25mph.
Delta: Lighter northerly 5-10mph gusting 15mph.