Friday, May 24 2013 11:45 PM EDT2013-05-25 03:45:03 GMT
Officers are on the scene of a deadly shooting in East Feliciana Parish. There is very little information right now, but we're told it happened around 4 p.m. at a home on Highway 10, near Smith Road, justMore >>
Investigators have arrested a suspect in a murder that happened on Friday afternoon in a small community near Clinton.More >>
Friday, May 24 2013 9:24 PM EDT2013-05-25 01:24:18 GMT
Concealed weapon permits are popular certain parts of Louisiana, though some of locations may surprise you. Louisiana Department of Public Safety officials gave a report to state legislators detailingMore >>
Concealed weapon permits are popular in certain parts of Louisiana, though some locations may surprise you.More >>
Friday, May 24 2013 4:17 PM EDT2013-05-24 20:17:05 GMT
Police say a motorcyclist in West Ashley had to tip his bike over to the side in order to get rid of a drunk woman who had hopped into the rear seat. On Thursday at 8:50 a.m., a man on a motorcycle approachedMore >>
Police say a motorcyclist had to tip his bike over to the side in order to get rid of a drunk woman who had hopped into the rear seat.More >>
Thursday, May 23 2013 6:45 PM EDT2013-05-23 22:45:01 GMT
(WMC-TV) - A baby fights to survive at Le Bonheur Children's Hospital in critical condition after being hit by an SUV with his mother behind the wheel, according to police. An orange circle marks the pointMore >>
A baby fights to survive at Le Bonheur Children's Hospital in critical condition after being hit by an SUV with his mother behind the wheel, according to police.More >>
WAFB congratulates our areas shining stars. It's the Best of the Class - 2013.More >>
As another school year ends, WAFB wants to congratulate our areas shining stars. It's the Best of the Class - 2013.More >>
Question:
I have a question regarding barometric pressure: Do changes in pressure follow any rhythm (seasonal, annual)?
Answer:
Assuming that we are focusing on Louisiana and the Gulf Coast region . . . (I believe that the following would be true for just about every location, but I have not investigated the data on a national or international scale) . . .
Typically, expect monthly/seasonal average pressures to be higher in the "cooler" months (winter) . . . and lower in the "warm" months (summer). For south Louisiana, peak average monthly pressures typically can be expected in January & February (say, ~30.10-30.20 millibars at SLP), with lowest average monthly pressures ranging from June to September (~29.95-29.85 mb, the actual month for each and every site varies a bit as a function of "average statistics".)
The diurnal (daily) average pressure rhythm - highest in the early morning, lowest in the mid/late afternoon - tends to be of nearly the same magnitude/range as the annual cycle.
Why (for the annual & daily cycles) you may ask?
Because, all other things held "constant", surface pressures tend to fall as surface temperatures increase. Heating of the surface air makes it "lighter" . . .
