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

Date:  28-Mar-15 Local Time:  07:34 AM Meteorologist:  Liu
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 7 Wind Speed (mph)  = 15
500 millibar height (decameters) = 576 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.75
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 3.6
Allocation Equation: = 11589
   
ARB REVISED Basinwide Allocation _________________________________________ = 3000
Revised Allocation _________________________________________ = 3000
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 10 8 1 0.17 370 6 COL
Sutter 7 10 1 0.17 370 2 YUB
Butte 9 10 1 0.17 370 6 CIC-GRD
Yolo/Solano 6 7 1 0.15 350 6 DAV-WOO
Glenn 5 8 1 0.13 330 3 WLW
Sacramento 7 11 1 0.09 290 3 SAC
Yuba 7 10 1 0.07 270 2 YUB
Placer 5 4 1 0.05 250 4 ROS
Tehama 5 8 1 200 acres
unless reduced
by PM
200 3 WLW
Shasta 10 6 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 ***
Low pressure system is passing through northern California and will bring strong northerly winds to the Valley, especially on the west side. Sutter Buttes reported wind speeds in the 40-50mph range this morning. Morning inversions should mix out quickly. Temperature will be lower than yesterday but still above normal. Possible showers might occur over Sierra Crest south of Tahoe.

24 Hour Outlook
*** Permissive Burn Day ***
Expect decreasing northerly winds tomorrow as the low pressure system moves off California. Temperature will increase a little until next low pressure system move in on the coming Tuesday, bring in active winds, deep mixing heights for good burning.
Mixing Height Discussion:
Valley: Mixing heights will near 2,000 feet.
Winds:
Valley: N 10-15 mph, gust 20-30 mph
Delta: W 6-10 mph and shift to N 20-25 mph