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Extreme Weather Analysis

July 22, 2013

There are two links in this posting that talk about extreme weather. The first is a video from Australia and the second is about the unusal heatwave on the east coast of America.

First link:

YouTube video at http://www.youtube.com/watch?feature=player_embedded&v=Kpigok-lVK4

Video description.

In this special report Anja Taylor looks at the domino effect of environmental and atmospheric factors that drive the globe to wetter, hotter, drier and colder extremes

Second Link:

Full Article at http://www.climatecentral.org/news/drunken-weather-pattern-leads-to-deadly-heat-16260

By Andrew Freedman

The heat wave that has built across the eastern U.S. — roasting cities from Memphis to Washington to Boston in a stifling blanket of heat and humidity — has had one strange characteristic that meteorologists cannot yet explain in a long-term climate context. Rather than moving west to east, as typical weather patterns do in the Northern Hemisphere, weather systems across the country have moved in the opposite direction, like a drunken driver on a dark stretch of highway, drifting from east to west during the past two weeks.

<snip>

While heat waves during July are nothing new, the weather pattern that is creating this one is rare enough for meteorologists to take note. In addition to the Bermuda leaving its more tropical locale and camping out in Michigan, an area of low pressure at the upper levels of the atmosphere has also been roaming the U.S. since July 11, drifting from east to west, traveling from the Mid-Atlantic states to Texas, where it brought some welcome rainfall.

The air flow heading in the opposite direction across the U.S. is abnormal, as is the strength of the dome of high pressure. In recent years there have been numerous instances of strong and long-duration high pressure areas that have led to extreme weather events, including the Russian heat wave of 2010. According to NOAA, scientists are scheduled to meet at Oak Ridge National Laboratory in September to explore whether such “monster ridges” of high pressure are becoming more frequent or more intense as the atmosphere warms in response to manmade greenhouse gas emissions.

Full Article at http://www.climatecentral.org/news/drunken-weather-pattern-leads-to-deadly-heat-16260

Edited 7/27/13 to add the following article about the unusual movement of  the low pressure system:

Full Article at http://www.theweatherspace.com/2013/07/14/unusual-storm-system-moving-backwards-across-united-states-through-end-week/

A low pressure system that started in the Eastern United States has retrograded under a ridge of high pressure to the north over the last couple of days. This system is moving from east to west, which is extremely unusual for this hemisphere. We’ve seen these move east to west for a short period of time, but this one will make it to Southern California by the time it weakens.

The upper level system is known as an easterly wave, however I’d like to call it a super easterly wave based on the distance it is going to travel. This particular system will have traveled from one side of the country to the other once it has stopped moving west, diving from there into Mexico, gathering up monsoonal moisture to be put into Nevada and Southern California later in the week into next week.

Full Article at http://www.theweatherspace.com/2013/07/14/unusual-storm-system-moving-backwards-across-united-states-through-end-week/

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