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

Date:  24-Jun-19 Local Time:  07:53 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Fair)    
A.M. Stability (F) = 8 Wind Speed (mph)  = 7
500 millibar height (decameters) = 578 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.5
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 8.3
Allocation Equation: = 6289
   
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 5 1 0.17 200 8 COL
Sutter 10 10 1 0.17 200 12 YUB
Butte 5 4 1 0.17 200 7 CIC-GRD
Yolo/Solano 8 10 1 0.15 200 11 DAV-WOO
Glenn 5 4 1 0.13 200 7 WLW
Sacramento 6 4 1 0.09 200 9 SAC
Yuba 10 10 1 0.07 200 12 YUB
Placer 8 6 1 0.05 200 11 ROS
Tehama 3 3 1 200 acres
unless reduced
by PM
200 3 RBL
Shasta 12 10 1 200 11 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***
***The ozone forecast EXCEEDS 100 AQI today (115). Therefore it is a NO BURN DAY only for the SFONA affected districts, counties and zones.***

Flat ridge over the west today, bringing only some high clouds, light winds and just above normal temps . Cooler temps coming for this week as a deep upper low moves down from the Gulf.
Today, expect p/c skies, temps in the mid 90s, light and variable winds then light southerly 5-10mph by aftn, delta winds SW 10-15mph, and mixing hgts remaining high at 3,000ft. Dispersion is good.

24 Hour Outlook
*** Permissive Burn Day ***
The upper low moves closer, bringing more cooling temps but still in the lower 90s. The coolest temps for the week occurs Wed-Thur in the low 80s, as an upper low moves down from the Gulf of Alaska.
Mixing Height Discussion:
Valley: Mixing heights near 3000 feet by afternoon.
Winds:
Valley: L+V 3-5mph, then light southerly 5-10mph by aftn.
Delta: SW 10-15 mph.