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

Date:  24-Apr-15 Local Time:  08:00 AM Meteorologist:  Lancero
Ag Burn Decision Above 3000 ft:  Permissive Burn Day (Good)    
A.M. Stability (F) = -5 Wind Speed (mph)  = 7
500 millibar height (decameters) = 559 Average Rainfall (in) = 0
Meteorological (MET) Factor   = 0.75
Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5) = 7.1
Allocation Equation: = 13962
   
ARB REVISED Basinwide Allocation _________________________________________ = 4000
Revised Allocation _________________________________________ = 4000
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 13 11 1 0.17 540 18 COL
Sutter 12 10 1 0.17 540 9 YUB
Butte 10 10 1 0.17 540 6 CIC-GRD
Yolo/Solano 12 12 1 0.15 500 8 DAV-WOO
Glenn 8 7 1 0.13 460 2 WLW
Sacramento 17 16 1 0.09 380 7 SAC
Yuba 12 10 1 0.07 340 9 YUB
Placer 12 9 1 0.05 300 6 ROS
Tehama 8 7 1 200 acres
unless reduced
by PM
200 2 WLW
Shasta 10 14 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:
***DUE TO A PLANNED POWER OUTAGE LATE FRIDAY AFTERNOON ARB WILL ISSUE A THREE DAY FORECAST FOR FRI, SAT & SUN ON FRIDAY MORNING***

*** FRI 24apr PERMISSIVE BURN DAY 4000 acres Allocation ***
The shortwave that moved though the upper valley last night brought active weather with lightning, has moved over the Great Basin. Today, expect lingering showers over the sierras, m/c skies, cooler temps near normal in the mid 70s, light and variable winds 3-5mph throughout the valley, and mixing hgts reaching 3000ft+ by aftn. Good dispersal conditions.

*** SAT 25apr PERMISSIVE BURN DAY Only 2000 acres Allocation with 200ac each ***
RAIN overnight by early Sat morning as a cold front moves though. Expect a few tenths of precip in the valley, and snow in teh foothills and sierras with snow levels at 5000ft. Cooler temps in the upper 60s. Winds light and variable 3-5mph throughout the valley with slight southerly winds, Delta winds onshore 5-15mph. Mixing hgts 3000ft. Good dispersion.

*** SUN 26apr PERMISSIVE BURN DAY Only 2000 acres Allocation with 200ac each ***
Precip ends late sat night, bringing dry conditions Sunday. Normal temps in the mid 70s. Winds light and variable 3-5mph early in the valley then stronger Northerly winds 8-15mph, Delta winds onshore 5-10mph. Mixing hgts 3000ft. Good dispersion.
Mixing Height Discussion:
Valley: for all three days - Mixing heights will reach 3000+ feet by mid-afternoon.
Winds:
FRI 24apr: Valley: L+V 3-5 mph. Delta: SW 5-15mph.
SAT 25apr: Valley: L+V 3--5 mph. Delta: SW 5-15mph.
SUN 26apr: Valley: L+V 3--5 mph, then North 8-15mph. Delta: SW 5-10mph.