Tornado tracks North America
Posted 01 June 2012 - 22:39
Posted 01 June 2012 - 22:52
Posted 01 June 2012 - 23:59
The prevailing upper level winds during meso cyclonic events. Between roughly 45-60 deg. they likely run close to parallel with the Equator. If tornados occurred in the Arctic you would likely see a CW rotation on the compass moving towards a 315-135 vector.
Posted 02 June 2012 - 02:05
Hi Paul, and everyone
Well in the north is New England, and this is sometimes called the northern Appalachians, and considered separately by some.
Yes I see that track across Florida. It would be interesting to know the details of that one.
I am wondering if there were tornadoes in the LGM to late Pleistocene. With sealevel lower, and the Laurentide Ice Sheet (LIS) in North America affecting climate,
would there have been continental land surface where warm and cold fronts could even produce tornadoes?
This post has been edited by NileQueen: 02 June 2012 - 02:05
Posted 02 June 2012 - 02:29
Best I can tell, if there is a large stretch of flat land (nlt 100km X 100km) where the upper air current moves at an angle greater then about 40 deg. compared to the vector of the surface wind and there is about a 12-18 deg. differemce in air temperature between the surface to between 8-12km above the surface, there might be a chance.
Add to that a surface RH of over 65% and an elevated RH of less then 35%, yea it might be possible to develop a whirlwind. Add in a difference in wind speed of around 60km between the surface and upper air and you might get beyond a EF0-1 twister...
Posted 02 June 2012 - 13:35
the mountains in bama have a flat top, for many miles, like a platter for the tornados to feed on.
here in west virginia, especially in south east (monroe county) we have a mountain in front of us that sheilds us from storms, including snow storms, i will take pics this weekend, to show it. if a storm comes from the east, it will be a bad one, as the majority come from the southwest. we get very little snow, have a more moderate climate, and have rolling hills. the counties north and west of us start a whole different terrain. summers county has mountains, deep ravines and few rolling hills. there has been only 1 bad outbreak of tornados, and that was in april of 1974. my cousin robin was the only person killed in that outbreak. i remember that night, and the weather that one night was different. we lived on Hump mountain, and heard the tornado cross new river and hit meadow bridge.
that picture of the tracks of tornados is striking. absolutely amazing!