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 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 6:49 PM EDT2013-05-24 22:49:23 GMT
Cameron Stringfellow
A teenager was killed and a second was arrested on DUI charges in an overnight accident, according to the South Carolina Highway Patrol. Investigators say a BMW being driven by 18-year-old Cameron StringfellowMore >>
A teenager was killed and a second was arrested on DUI charges in an overnight accident, according to the South Carolina Highway Patrol.More >>
Friday, May 24 2013 11:57 PM EDT2013-05-25 03:57:02 GMT
Friday afternoon's elimination game was a bit of déjà vu with No. 2 LSU (50-9) and Alabama (34-26) colliding once again. Even more so when the Tigers won 3-2 to knock the Tide out of the SEC Tournament.More >>
Friday afternoon's elimination game was a bit of déjà vu with No. 2 LSU and Alabama colliding once again. Even more so when the Tigers won 3-2 to knock the Tide out of the SEC Tournament.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" . . .
