WEATHER TRIVIA
This week's question involves LAST weekends
crazy weather. It actually snowed during the downpours in some areas..
at 45 degrees!! How can that happen?
ANSWER: A very cold pool of air moved in above, and thunderstorms
erupted at the same time. As you can see by a typical thunderstorm
structure to the left, warm air is drawn into the thunderstorm ahead
and from the sides of the approaching storm. However, JUST ahead of,
and accompanying rain, t
here is a DOWNDRAFT of cold air from above. This often results in what
is known as a "microburst" which is a cold rush of air down that
spreads out at speeds up to 100mph when hitting the ground causing
tornado like damage. This area of the storm is sometimes accompanied by
hail, large chunks of ice that are blowing around up and down in the
top of the thunderstorm, getting bigger and bigger until they fall as
ice out of the cloud. But snow??? Rare, but it happens in the "near
winter" season. If the downdraft is strong enough, it will simply
accompany huge snowflakes that form which rush down from the cloud and
don't have time to melt, even if the temperature near the ground is
45-52 degrees. That is why there is snow on record in places like
Rochester, NY in August as an example, and why it snowed in Harvard,
Ma. briefly last weekend (5/21) in the Boston area! CLICK ON THE IMAGE, ASIDE FROM THE COLOR, IT IS HAND DRAWN BY WEATHER EXPERT/METEOROLOGIST/PROFESSOR JEFF HABY.



















