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

Date:  24-Jul-16 Local Time:  07:15 AM Meteorologist:  Branz
Ag Burn Decision Above 3000 ft:  No Burn Day    
A.M. Stability (F) = 19 Wind Speed (mph)  = 7
500 millibar height (decameters) = 591 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.25
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 10.6
Allocation Equation: = 3641
   
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 13 COL
Sutter 9 11 1 0.17 200 8 YUB
Butte 8 7 1 0.17 200 7 CIC-GRD
Yolo/Solano 11 13 1 0.15 200 15 DAV-WOO
Glenn 11 10 1 0.13 200 8 WLW
Sacramento 2 4 1 0.09 200 6 SAC
Yuba 9 11 1 0.07 200 8 YUB
Placer 8 8 1 0.05 200 13 ROS
Tehama 11 10 1 200 acres
unless reduced
by PM
200 8 WLW
Shasta 9 8 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:
*** Permissive Burn Day ***
High pressure will continue to strengthen over the region today. This ridge has brought slightly stronger AM stability, although PM levels remain about the same as yesterday. Expect poor dispersion today as winds will remain on the light side until late afternoon, when flow through the Delta should increase a bit. Use plenty of caution if burning today.

24hr Outlook
*** Permissive Burn Day ***
A slight cooling trend is in store for Monday in the south Valley as onshore flow increases. Elsewhere, high temperatures will remain at or above the century mark. Expect poor dispersion through the work week as strong high pressure remains anchored over the region. The second half of the week looks to be the warmest and most stagnant. Some relief may be in sight for next weekend, but forecast models are unclear at this time.
Mixing Height Discussion:
Valley: Mixing heights will reach above 3000 feet by afternoon.
Winds:
Valley: Southerly 4-8 mph through mid-afternoon, increasing to 5-10 mph late.
Delta: West to southwesterly 8-12 mph, increasing to 10-15 mph late.