Topic: Particularly Dangerous Situation PDS Watch issued in US April 24 2010

[nmoir]

A particarly dangerous situation has been issued in Tennessee and alabama...its 10:30 am there and already they have large damaging tornadoes on the ground

http://www.spc.noaa.gov/products/watch/ww0094.html

[Jimmy Deguara]

Hi Nick,

The main tornado of the day was on  the ground for 1.5 hours att he time I checked which is historic in significance. Very few tornado outbreaks produce tornadoes with life times of more than an hour.

Regards,

Jimmy Deguara

[Colin Maitland]

Early news reports indicate that at least 7 people have been killed and over 24 injured from the tornadoes and storms.

http://news.ninemsn.com.au/world/1044452/us-tornado-kills-two-destroys-homes

Col

[nzstorm]

The sounding taken at Jackson, Mississippi on the morning of that tornado has to be one of the most incredible observed soundings I think I've seen. The surface dp was 22C with CAPE 1970j/kg, incredible for 8am and the wind at 900mb 55kts! 250mb 100kts.
 

[Jimmy Deguara]

Hi guys,

What you find in these situations is even cumulus begin to rotate prior to the supercell developing! Awesome!

Regards,

Jimmy Deguara

[Colin Maitland]

 This news article has recently been posted on AccuWeather.com, so instead of rewording I thought it was better just to paste the article in full in case the link disappears. Amazing facts on the storm.

http://www.accuweather.com/blogs/news/story/30959/deadly-mississippi-tornado-ent.asp

The article states:

The powerful tornado that devastated a large section of Mississippi on Saturday has entered record books as one of the longest-tracking, widest and deadliest tornadoes to tear through Mississippi.

National Weather Service survey officials recently analyzed the tornado's destruction and determined that there was no clear break in its damage trail. That indicates it was one single tornado path.

The twister touched down five miles west of Tallulah, La., during the late morning hours. After remaining on the ground for nearly three hours, the tornado finally dissipated 5.5 miles north of Sturgis, Miss.

The tornado traveled a total of 149.25 miles, the fourth longest path of any tornado to pass through Mississippi. The Candlestick Park F5 tornado and its 203 miles, from March 3, 1966, holds the record as the longest-tracking tornado in Mississippi's history.

Along the tornado's path of destruction, ten people were left dead on Saturday. That means this tornado is Mississippi's ninth deadliest since 1900.

The deadliest tornado in Mississippi since 1900 occurred on February 21, 1971, when 58 people were killed. The all-time deadliest twister in the state's history left 317 people dead near Natchez on May 6, 1840.

Saturday's tornado measured 1.75 miles wide at its peak, making this twister the widest ever to tear through Mississippi.

The tornado was at its widest as it approached the intersection of U.S. Highway 49 and Highway 16 on the south side of Yazoo City. The tornado was also at its strongest at this time, receiving an EF-4 ranking with maximum winds of 170 mph.

The tornado totally destroyed a church and several businesses in the Yazoo City area. Numerous homes also sustained heavy damage or were destroyed.

Even before reaching Yazoo City, the strength of the tornado was strong almost immediately after touching down.

The tornado bent and destroyed several high-tension power poles west of Tallulah, La. The twister continued on and blew a semi-truck off Interstate 20.

Interstate traffic was again threatened after the tornado tore through the Yazoo City area. Numerous vehicles were swept off Interstate 55 in central Mississippi.

The weather today will continue to cooperate with cleanup efforts in the wake of this devastating tornado. The threat of severe weather will once again return to Mississippi Friday afternoon.