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

Date:  22-Jul-17 Local Time:  08:07 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  No Burn Day    
A.M. Stability (F) = 12 Wind Speed (mph)  = 7
500 millibar height (decameters) = 590 Average Rainfall (in) = 0.00
Meteorological (MET) Factor   = 0.4
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 10.4
Allocation Equation: = 4860
   
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 9 6 1 0.17 200 13 COL
Sutter 8 9 1 0.17 200 9 YUB
Butte 13 14 1 0.17 200 13 CIC-GRD
Yolo/Solano 10 10 1 0.15 200 11 DAV-WOO
Glenn 10 12 1 0.13 200 10 WLW
Sacramento 12 11 1 0.09 200 9 SAC
Yuba 8 9 1 0.07 200 9 YUB
Placer 10 8 1 0.05 200 10 ROS
Tehama - - 1 200 acres
unless reduced
by PM
200 - RBL
Shasta 13 8 1 200 5 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 ***
*** It's a SPARE THE AIR for SMAQMD. (forecast 136 AQI). No Burn for SFONA areas ***

The Detwiler fire has affected air quality in the valley, issuing the spare the air alert. Still High pressure over the desert SW, bringing triple digit readings expected across the valley and light southerly winds.
Today, expect temps in the upper 100s in the nValley and low 100s in the sValley, winds light southerly 5-10mph, delta winds onshore SW 5-15mph, and mixing hgts reaching 3,000ft by mid aftn.

24hr Outlook
*** Permissive Burn Day***
*** Ozone forecasted to be above 100 AQI so no burn for SFONA ***
Weak trough just off the North Coast by Sunday bringing a more organized pattern of onshore conditions Sunday and into early next week for the coast and South Valley. This trof will cool the temps down a bit in the low 90s.
Mixing Height Discussion:
Valley: Mixing heights will reach near 2500-3000 feet by early afternoon.
Winds:
Valley: Southerly 5-10 mph.
Delta: SW 10-15 mph.