|Date: 27-Dec-19||Local Time: 07:29 AM||Meteorologist: Branz|
|Ag Burn Decision Above 3000 ft: Permissive Burn Day (Fair)|
|A.M. Stability (°F) = 9||Wind Speed (mph)||=||14|
|500 millibar height (decameters) = 560||Average Rainfall (in)||=||0|
|Meteorological (MET) Factor||=||0.7|
|Air Quality (AQ) Factor (Basinwide 00-06 PST Average PM2.5)||=||7.7|
|ARB REVISED Basinwide Allocation||_________________________________________||=||2500|
|Tehama||-||-||1|| 200 acres
|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%)
|*** Permissive Burn Day ***
North winds will continue today as high pressure tries to build in from the west behind the pesky upper low that's been hanging around in SoCal for the past few days. Wind speeds should remain just below restricted criteria, but don't be surprised to see some gusts to 25-30 mph in the usual wind-prone areas this afternoon. Otherwise...AM stability is higher today but with clear and sunny conditions, vertical mixing should be fine. Use caution if burning with the north winds.
*** Permissive Burn Day ***
Saturday still looks dry at this point, with weaker winds and higher AM stability as high pressure noses in from the west. Rain chances return Sunday with another trough pushing in from the northwest. This system will take a similar track to the last one, so other than a few showers on Sunday, the full effects of the trough will be farther south. Expect another round of gusty north winds on Monday as this system pulls away to the southeast. The first several days of 2020 look dry at this point as a dominant ridge of high pressure takes shape over much of California.
|Mixing Height Discussion:|
|Valley: Mixing heights will reach 1500 feet by afternoon.|
|Valley: North to northwesterly 10-15 mph with gusts to 25 mph in the north and west this afternoon.
Delta: North to northwesterly 10-15 mph with gusts to 25 mph this afternoon.