[Gasification] Baby ice ages -- pure "trivia"
Peter Singfield
snkm at btl.net
Mon Mar 19 17:17:13 CDT 2007
Imagine forty days and forty night of this -- eh??
How many days and night to make a miles high ice sheet??
The physics of this situation is buried in the following -- little bit here
and there -- such as:
"entrainment of dry air into strong thunderstorms over continents can
increase the frequency of hail by promoting evaporational cooling which
lowers the freezing level of thunderstorm clouds giving hail a larger
volume to grow in"
Global warming -- drought -- dry lower air -- upper atmosphere -- to hot --
super saturated --
Smoke from many fires --
Every here of precipitating rain fall by airplanes "seeding"??
So how about smoke raising in the air over tremendously hot -- dry -- fires??
Or a major volcano popping of at the wrong time??
And the "fuel" that causes the setting of these global warmed conditions??
Well -- one the major ones -- CO2!!
We just do not know for sure!! Keep minds "OPENED"
Peter / Belize
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http://en.wikipedia.org/wiki/Hail_stone
Hail is a form of precipitation which consists of balls or irregular lumps
of ice (hailstones), 5 mm50 mm in diameter on average, with much larger
hailstones from severe thunderstorms[1]. Hail is always produced by
cumulonimbus (thunderclouds), and is composed of transparent ice or
alternating layers of transparent and translucent ice at least 1 mm thick.
Small hailstones are less than 5 mm in diameter, and are reported as SHGS.
Unlike ice pellets, they are layered and can be irregular and clumped
together.
Hail formation
Hail forms on condensation nuclei such as dust, insects, or ice crystals,
when supercooled water freezes on contact. Hailstones are usually from the
size of a pea to the size of a golfball. In clouds containing large numbers
of supercooled water droplets, these ice nuclei grow quickly at the expense
of the liquid droplets because the saturation vapor pressure over ice is
slightly less than the saturation vapor pressure over water. If the
hailstones grow large enough, latent heat released by further freezing may
melt the outer shell of the hailstone. The growth that follows, usually
called wet growth, is more efficient because the liquid outer shell allows
the stone to accrete other smaller hailstones in addition to supercooled
droplets. These winds hold the rain and freeze it. As the process repeats,
the hail grows increasingly larger. Once a hailstone becomes too heavy to
be supported by the storm's updraft it falls out of the cloud. When a
hailstone is cut in half, a series of concentric rings, like that of an
onion, is revealed. These rings reveal the total number of times the
hailstone had traveled to the top of the storm before falling to the ground.
[edit] Ideal conditions for hail formation
Hail forms in strong thunderstorm clouds, particularly those with intense
updrafts, high liquid water content, great vertical extent, large water
droplets, and where a good portion of the cloud layer is below freezing (<
32 °F (0 °C)). The growth rate is maximized at about -13 °C (9 °F), and
becomes vanishingly small much below -30 °C (-22 °F) as supercooled water
droplets become rare. For this reason, hail is most common in midlatitudes
during early summer where surface temperatures are warm enough to promote
the instability associated with strong thunderstorms, but the upper
atmosphere is still cool enough to support ice. Accordingly, hail is
actually less common in the tropics despite a much higher frequency of
thunderstorms than in the midlatitudes because the atmosphere over the
tropics tends to be warmer over a much greater depth. Also, entrainment of
dry air into strong thunderstorms over continents can increase the
frequency of hail by promoting evaporational cooling which lowers the
freezing level of thunderstorm clouds giving hail a larger volume to grow in.
Hail is also much more common along mountain ranges because mountains force
horizontal winds upwards (known as orographic lifting), thereby
intensifying the updrafts within thunderstorms and making hail more likely.
One of the most notorious regions for large hail is northern India and
Bangladesh, which have reported more hail-related deaths than anywhere else
in the world and also some of the largest hailstones ever measured.
Mainland China is also notorious for killer hailstorms. Certain locations
in North America (such as the area around Calgary, Alberta) have gained the
nickname "Hailstorm Alley" among meteorologists for the frequency of
hailstorms and their severity.[1]
Hailstones, while most commonly only a few millimetres in diameter, can
sometimes grow to 15 centimetres and weigh more than half a kilogram (1.1
pounds)[2]. Pea or golfball-sized hailstones are not uncommon in severe
storms. Hail can do serious damage, notably to automobiles, skylights,
glass-roofed structures, and most commonly, farmers' crops. Rarely, massive
hailstones have been known to cause concussions or fatal head trauma.
Sometimes, hail-producing clouds are identifiable by their green
colouration.[2] [3]
Costly or deadly hailstorms
HailstormAround the 9th century, several hundred pilgrims were killed by a
massive hailstorm in Roopkund, Uttarakhand, India.[4]
July 28, 1981: softball-sized hail hits Calgary, Alberta, Canada, causing
$150 million in damage.
July 11, 1990, Denver, Colorado, USA, Softball-sized hail destroyed roofs
and cars, causing $625 million in total damage.
September 7, 1991: a Labor Day thunderstorm caused $400 million worth of
insurable damage in Calgary. Thirteen additional hailstorms between 1981
and 1998 caused an estimated $600 million in damage in the Calgary area
alone.[5][6]
May 5, 1995, Dallas and Fort Worth, Texas, USA, $1.1 billion insured losses.
April 14, 1999, Sydney, New South Wales, Australia, $1.6 billion. 20,000
properties and 40,000 vehicles were damaged during the storm with more than
25 aircraft damaged at Sydney Airport, one person was killed while fishing
after getting struck by lightning and several other people were injured. It
was the costliest hailstorm to hit an Australian populated city. [7]
May 18, 2000, McHenry, Lake, northern Kane, and northern Cook County,
Illinois, USA, $572 million [8]. Golfball-, baseball-, and softball-sized
hail damaged roofs, cars, patio furniture, skylights, and windows in the
area's worst and most widespread hailstorm in 30 years. Around 100,000
homes lost power. Hail was 3 inches deep in many areas. There were 100
canceled flights, and train service was disrupted. [9][10]
April 10, 2001, St. Louis, Missouri, USA, $1.9 billion insured losses.
July 19, 2002, Henan Province, the People's Republic of China, 25 dead and
hundreds injured.
June 22, 2003, Aurora, Nebraska, USA, Largest hailstone on record falls. It
has a 7-inch diameter and a circumference of 18.75 inches.
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