MIssissippi tornado rated a violent EF-4

By: Dr. Jeff Masters , 27. huhtikuuta 2010 klo 14:30 (GMT)

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The devastating tornado that ripped through Mississippi on Saturday April 24, killing ten, was a violent EF-4 twister with 170 mph winds when it hit Yazoo City, according to a preliminary damage survey by the National Weather Service in Jackson, Mississippi. The tornado touched down near Tallulah, Louisiana, crossed the Mississippi River into Mississippi, and traversed nearly the entire state of Mississippi, carving a 149-mile long path of destruction. It is extremely rare for a tornado to stay on the ground this long. The world record longest path by a tornado is the 219-mile long path of the deadliest tornado in U.S. history, the violent F-5 Tri-State Tornado of 1925, which killed 695 people in Missouri, Illinois, and Indiana.


Figure 1. A church in Yazoo City works to restore its toppled steeple after Saturday's tornado. Image credit: J.A.

Saturday's tornado was strong almost from its initial stage of development in northeast Louisiana. EF-2 and EF-3 damage was common all along the tornado's path into central Mississippi with areas of EF-4 damage observed in both Yazoo and Holmes counties. After crossing Interstate 55, the tornado weakened with EF-1 and occasional EF-2 damage being common as the tornado moved across Attala County. The tornado re-intensified as it moved into Choctaw County, with at least high end EF-3 damage occurring northwest of the Weir community. The tornado remained strong before rapidly weakening and then dissipating just after moving into Oktibbeha County. It was the first violent EF-4 tornado of 2010. Over the past decade, the U.S. has averaged five violent EF-4 or EF-5 tornadoes per year. Our severe weather expert, Dr. Rob Carver, has a more detailed analysis of Saturday's tornado.


Figure 2. One mile wide wedge tornado from near Yazoo City, Mississippi on April 24, 2010. Tornadovideos.net intercepted the tornado near Holly Bluff just east of the Mississippi River, and tracked the huge wedge to the damage path in Yazoo City, after which they assisted with the rescue effort until emergency personnel gained control of the situation.

Portlight assesses needs after the Mississippi tornado
Portlight.org volunteer Riki Chomsky (AKA "kitchengypsy") paid a visit to tornado-ravaged Yazoo City, Mississippi on Sunday to assess whether or not Portlight should mount a response effort. Her report:

At this time, Portlight has decided not to deploy an emergency feeding unit to Yazoo City. We base this decision on 3 factors:

1) Scope. Although the scenes of devastation are terrible, by our estimate, more than half the city is relatively unharmed. With several restaurants, gas stations and other services open for business in such close proximity to the command center, we have faith that continuity of operations will soon be established for the whole city.

2) Current efforts: All current relief teams, with special emphasis on the Red Cross and Salvation Army, are doing an excellent job of handling the situation. They have taken pains to ensure food distribution across the affected areas, and we have confidence that they are truly the best organizations for this type of situation.

3) Anticipated Need / Speed of Recovery: although the extent of the damage will most likely require outside work crews, we saw very encouraging signs of progress. Work crews were active at almost every damaged site, which is highly impressive for less than 24 hours after the storm. Even when volunteer crews are brought in, we anticipate their needs being more than adequately met by the existing local churches, who have already started feeding work crews and rescue personnel. In addition to the Red Cross and Salvation Army, Portlight extends our appreciation to all members of this exemplary community response. While the damage is significant, the Salvation Army and local Red Cross seem to be doing a great job meeting the needs there, and Portlight recommends supporting one of these organizations.

Portlight continues aid efforts in Haiti
Portlight continues to focus its energy and funds on the situation in Haiti, where the rainy season is fast approaching the needs for shelter, medical supplies, food and water remain urgent. Their latest effort is a shipment of 10 pallets of Durable Medical Equipment, 30 pallets of water, 7,000 pounds of rice, a number of tents, tarps and various building supplies totaling some 14,000 pounds of goods. The supplies were loaded onto the schooner Halie and Mathew. The schooner was slowed by bad weather on its way to Haiti, and was forced to dock in Jamaica to make repairs. The ship is expected to land in Haiti later this week to deliver its supplies. Please visit the Portlight.org web site or the Portlight blog to learn more and to donate to this worthy cause.


Figure 3. Relief supplies for Haiti earthquake victims being loaded onto the schooner Halie and Mathew.

Jeff Masters

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1086. MrstormX
26. elokuuta 2010 klo 02:29 (GMT)

Quoting tornadodude:



Member Since: 27.05.2009 Posts: 0 Comments: 4355
1085. hydrus
29. huhtikuuta 2010 klo 13:33 (GMT)
Quoting tornadodude:
imagine if we had a tropical weather blog that stayed away from controversial topics?
Yes. Imagine all the edified conversation we could have....:)
Member Since: 27.09.2007 Posts: 1 Comments: 19604
1084. stormwatcherCI
29. huhtikuuta 2010 klo 12:59 (GMT)
Quoting stormpetrol:

I 2nd that motion, we really need some good rain.
Yep. Boy, the heat is oppresive now. Even inside with the a/c on it is hard to cool off. Think we might really get a hard hit this year. God forbid.
Member Since: 9.10.2008 Posts: 0 Comments: 8242
1083. PcolaDan
29. huhtikuuta 2010 klo 12:58 (GMT)
NEW BLOG
Member Since: 22.08.2008 Posts: 12 Comments: 6010
1082. zebralove
29. huhtikuuta 2010 klo 12:52 (GMT)
thanks mahfl dont know why I thought that was texas.... definatly thinking the brain quit working lol must be tired today. really liked being able to bring it up on screen bigger though makes the map easier to look at.
Member Since: 27.07.2009 Posts: 3 Comments: 95
1081. MahFL
29. huhtikuuta 2010 klo 12:48 (GMT)
This is where it is. There was an earlier sat pic but thats out of date now.

Link
Member Since: 9.06.2004 Posts: 0 Comments: 2912
1080. zebralove
29. huhtikuuta 2010 klo 12:47 (GMT)
never mind feeling pretty stupid as I just realized that is a map of it up above lol sort of thought I was looking at something over texas there. Guess working all night made my brain quit.
Member Since: 27.07.2009 Posts: 3 Comments: 95
1078. Skyepony (Mod)
29. huhtikuuta 2010 klo 12:47 (GMT)
Member Since: 10.08.2005 Posts: 156 Comments: 36157
1077. zebralove
29. huhtikuuta 2010 klo 12:45 (GMT)
Is there any images or maps that anyone can post of the oil spill and where it is exactly?
can they see it from space yet? hmmmm satelite photos maybe? anything?
Member Since: 27.07.2009 Posts: 3 Comments: 95
1076. IKE
29. huhtikuuta 2010 klo 12:44 (GMT)
Quoting Jeff9641:


I agree when is the government going to step in!! This is getting worse each day. I just hope this doesn't have a big economic impact as LA's fishing season kicks off on May 1st.


With a strong southerly to southeasterly fetch for days...doesn't look good.
Member Since: 9.06.2005 Posts: 23 Comments: 37858
1074. IKE
29. huhtikuuta 2010 klo 12:42 (GMT)
Buoy 64 NM south of Dauphin Island,AL...near the oil spill...

5-day plot - Wind Direction Wind Direction (WDIR): SE ( 130 deg true )
5-day plot - Wind Speed Wind Speed (WSPD): 9.7 kts
5-day plot - Wind Gust Wind Gust (GST): 11.7 kts
5-day plot - Wave Height Wave Height (WVHT): 0.7 ft
5-day plot - Average Period Average Period (APD): 4.0 sec
5-day plot - Atmospheric Pressure Atmospheric Pressure (PRES): 30.02 in
5-day plot - Pressure Tendency Pressure Tendency (PTDY): +0.01 in ( Rising )
5-day plot - Air Temperature Air Temperature (ATMP): 68.2 °F
5-day plot - Water Temperature Water Temperature (WTMP): 71.4 °F
5-day plot - Dew Point Dew Point (DEWP): 54.1 °F
Member Since: 9.06.2005 Posts: 23 Comments: 37858
1072. stormpetrol
29. huhtikuuta 2010 klo 12:25 (GMT)
Quoting stormwatcherCI:
I sure hope it is moving east and brings us some. Other than the 2 days of rain 2 weeks ago we haven't had any.

I 2nd that motion, we really need some good rain.
Member Since: 29.04.2007 Posts: 0 Comments: 7506
1070. RTLSNK
29. huhtikuuta 2010 klo 12:20 (GMT)
Quoting Chicklit:
Very disturbing, Rattlesnake. If they can't cap the well then what's next? Destroy the Gulf of Mexico with oil that spouts until the well runs dry?


Sorry, don't have a clue, what little I know about this situation I've picked up from reading the info everyone has posted here and from what we read on the news. I spent 25 years as an Airborne Ranger in the Army. My speciality is jumping out of perfectly good planes and living off the land in the jungles, mountains, and forests of the world. We always planned for the worst case scenario before an operation, I don't understand why they used a remote unit rather than one of the deep water submersibles the Navy uses. Probably because the remote units were equiped with a wrench unit that could turn the valve handles.
Member Since: 3.09.2008 Posts: 0 Comments: 19560
1069. IKE
29. huhtikuuta 2010 klo 12:20 (GMT)
Is this from the fires burning?

Member Since: 9.06.2005 Posts: 23 Comments: 37858
1067. wunderkidcayman
29. huhtikuuta 2010 klo 12:11 (GMT)
hey guys I wouldn't be suprised if that tropical moisture forms a low somwhere between honduras and panama and could become a tropical system
Member Since: 13.06.2009 Posts: 2 Comments: 9595
1066. Chicklit
29. huhtikuuta 2010 klo 12:01 (GMT)
Very disturbing, Rattlesnake. If they can't cap the well then what's next? Destroy the Gulf of Mexico with oil that spouts until the well runs dry?
Member Since: 11.07.2006 Posts: 14 Comments: 11047
1064. RTLSNK
29. huhtikuuta 2010 klo 11:58 (GMT)
It is very possible that when they sent that remote controlled underwater submersible down to close the Blow Off Valve that it slammed into the valve and broke it completely off the pipe. It is 5,000 feet down there. That might explain why seven days after the explosion it is now pumping 5 times more oil out than it was. Even though the valve didn't completely close the first time the way it was supposed to it may have partially closed. If it was broken off there is now nothing but a wide open pipe. If this did happen, we won't hear about it until someone leaks the information to the news. :(
Member Since: 3.09.2008 Posts: 0 Comments: 19560
1063. weathermanwannabe
29. huhtikuuta 2010 klo 11:56 (GMT)
Good Morning. Some pretty intense t-storms around Central America & the Yucatan this am....But, too much sheer (30-80 knots) on the Atlantic side for any sustained system.....However, the E-Pac side is only running 5 knots of sheer this morning in that region.........Hmmmmmmmmmmmm.
Member Since: 8.08.2006 Posts: 0 Comments: 8306
1062. aquak9
29. huhtikuuta 2010 klo 11:55 (GMT)
oil leak may be

linguistic spin doctors, covering their tails.
Member Since: 13.08.2005 Posts: 163 Comments: 25507
1061. IKE
29. huhtikuuta 2010 klo 11:48 (GMT)
Per MSNBC....Breaking News...BP says gulf oil leak may be as much as latest, higher estimate.

Really?
Member Since: 9.06.2005 Posts: 23 Comments: 37858
1060. aquak9
29. huhtikuuta 2010 klo 11:45 (GMT)
re- post 1033

sums it ALL up. I don't believe a WORD of what BP says. Fox and CNN, well they have dollar bills floating around too. They don't really care about the gulf shores. Any reporter who tries to tell the TRUTH will be shut down.

Coast Guard and NOAA are mad as hell about this and I don't think any amount of money's gonna shut THEM up.
Member Since: 13.08.2005 Posts: 163 Comments: 25507
1059. Chicklit
29. huhtikuuta 2010 klo 11:45 (GMT)
If they're going to drill then they oughta be able to plug the well or they shouldn't be drilling. Period.
Zero Tolerance for this sort of mess.
This land is my land.
This land is your land.
From California to the New York Highlands...
From the redwood forests to the gulf stream waters, this land was made for you and me,
the birds, fishes and wildlife.
Not BP.
Member Since: 11.07.2006 Posts: 14 Comments: 11047
1058. stormwatcherCI
29. huhtikuuta 2010 klo 11:44 (GMT)
Quoting belizeit:
I am rignt under that thunderstorm and i really enjoy it . Rain season at last
I sure hope it is moving east and brings us some. Other than the 2 days of rain 2 weeks ago we haven't had any.
Member Since: 9.10.2008 Posts: 0 Comments: 8242
1057. IKE
29. huhtikuuta 2010 klo 11:43 (GMT)
COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE NEW ORLEANS LA
514 AM CDT THU APR 29 2010

...HIGH TIDES MAY POSE A COASTAL FLOOD THREAT LATER THIS WEEK...

.A PERSISTENT SOUTH FLOW PATTERN IS EXPECTED TO DEVELOP TODAY AND
INCREASE WIND SPEEDS LATE TONIGHT. THIS WILL RESULT IN SIGNIFICANT
RISES IN TIDE LEVELS FRIDAY MORNING. TIDE LEVELS OF 2 TO 3 FEET
ABOVE NORMAL ARE POSSIBLE FRIDAY THROUGH SUNDAY AS THE SOUTH FLOW
PERSISTS.

LAZ038-040-058-060>064-066>070-MSZ080>082-292000-
/O.CAN.KLIX.CF.S.0004.000000T0000Z-100501T0200Z/
/O.NEW.KLIX.CF.A.0001.100430T0500Z-100503T0000Z/
TANGIPAHOA-ST. TAMMANY-ST. JOHN THE BAPTIST-ST. CHARLES-
UPPER JEFFERSON-ORLEANS-UPPER PLAQUEMINES-UPPER ST. BERNARD-
LOWER TERREBONNE-LOWER LAFOURCHE-LOWER JEFFERSON-
LOWER PLAQUEMINES-LOWER ST. BERNARD-HANCOCK-HARRISON-JACKSON-
514 AM CDT THU APR 29 2010

...COASTAL FLOOD WATCH IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
EVENING...

THE NATIONAL WEATHER SERVICE IN SLIDELL HAS ISSUED A COASTAL
FLOOD WATCH...WHICH IS IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
EVENING.

A PERSISTENT MODERATE TO STRONG SOUTH WIND FLOW IS EXPECTED TO
INCREASE TODAY AND CONTINUE UNTIL SUNDAY. ADDITIONALLY...THE
ASTRONOMICAL TIDE CYCLE WILL BE AT LARGE SPRING TIDE RANGES THIS
WEEKEND. THESE CONDITIONS WILL COMBINE TO PRODUCE UNUSUALLY HIGH
WATER LEVELS THAT MAY CAUSE COASTAL FLOODING OUTSIDE THE HURRICANE
PROTECTION LEVEE SYSTEMS.

TIDES MAY REACH 2 TO 3 FEET ABOVE NORMAL LEVELS AT SOME LOCATIONS
FRIDAY THROUGH SUNDAY DUE TO THE PERSISTENCE OF SOUTH FLOW. INUNDATION
WILL BE MOST NOTABLE DURING THE HIGH TIDE PORTIONS OF THE DAILY
TIDE CYCLE.

PERSONS ALONG THE COAST SHOULD CLOSELY MONITOR THE LATEST
FORECASTS AND STATEMENTS REGARDING THIS POTENTIAL EPISODE OF
COASTAL FLOODING. BE PREPARED TO TAKE APPROPRIATE ACTIONS TO
PROTECT LIFE AND PROPERTY IF COASTAL FLOOD WATCHES AND WARNINGS
ARE ISSUED LATER THIS WEEK AND OVER THE WEEKEND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A COASTAL FLOOD WATCH MEANS THAT CONDITIONS FAVORABLE FOR
FLOODING ARE EXPECTED TO DEVELOP. COASTAL RESIDENTS SHOULD BE
ALERT FOR LATER STATEMENTS OR WARNINGS...AND TAKE ACTION TO
PROTECT PROPERTY.

&&

Member Since: 9.06.2005 Posts: 23 Comments: 37858
1055. aspectre
29. huhtikuuta 2010 klo 11:31 (GMT)
26April2010
Member Since: 21.08.2007 Posts: 0 Comments: 4860
1053. tillou
29. huhtikuuta 2010 klo 11:26 (GMT)
Being from the New Orleans area and doing a little work in Plaquemines Parish, I can not understand why there is not more going on to prevent this stuff from washing ashore.

I guess I shouldn't be surprised, with all the post-Katrina stuff that had happened and keeps going on.

I just hope some loony coona$$ doesn't go out there with a match. I that that would be just as crazy.

(back to lurking mode til June)
Member Since: 19.08.2007 Posts: 0 Comments: 198
1052. SQUAWK
29. huhtikuuta 2010 klo 11:22 (GMT)
Let's all go to our local BP station and fill 'er up!! NOT

Maybe we should start a grassroots boycott of BP gas until they get the leak stopped and the mess cleaned up. That might get their attention.
Member Since: 9.12.2008 Posts: 0 Comments: 2498
1049. belizeit
29. huhtikuuta 2010 klo 11:13 (GMT)
Quoting BahaHurican:
Morning all.



Looks like some tropical moisture is moving across Central America this a.m. Looking at the surface analysis from TAFB, I doubt this is from that shortwave / forecasted low pple were looking at earlier this week.



Edit: Sorry, forgot the analysis map.... lol
I am rignt under that thunderstorm and i really enjoy it . Rain season at last
Member Since: 10.01.2010 Posts: 0 Comments: 915
1048. MahFL
29. huhtikuuta 2010 klo 11:11 (GMT)
from the BP guy...
"We're actually applying every resource available to us," he said.

That does not actually mean they have enough resources, I wonder if he actually understands that.
Member Since: 9.06.2004 Posts: 0 Comments: 2912
1046. MahFL
29. huhtikuuta 2010 klo 11:05 (GMT)
This is what the BP guy said about the new leak,
"Due to its location, we do not believe this changes the amount currently believed to be released," he said,

That simply does not make scense.
Member Since: 9.06.2004 Posts: 0 Comments: 2912
1044. IKE
29. huhtikuuta 2010 klo 10:22 (GMT)
Oil rig leak may be 5 times bigger than first believed

A disaster looming.
Member Since: 9.06.2005 Posts: 23 Comments: 37858
1043. aspectre
29. huhtikuuta 2010 klo 10:14 (GMT)
971 presslord "new estimate: 5000 barrels per day"

Thanks for the heads-up. Certainly closer to other US-affecting offshore blowouts: 8,000to10,000barrels per day averaged over 10days at Santa Barbara; and 11,000to12,000barrels per day averaged over 295days at Ixtoc I, Gulf of Mexico.

The ExxonValdiz wreck spilled ~11million gallons. At 5,000barrels/210,000gallons per day, the DeepwaterHorizon spill will reach that level by June11th.
In 2005, TropicalStorm Arlene began spinning up on June8th, and reached near-hurricane strength in the Gulf of Mexico on June10th.
Member Since: 21.08.2007 Posts: 0 Comments: 4860
1041. BahaHurican
29. huhtikuuta 2010 klo 09:24 (GMT)
Morning all.



Looks like some tropical moisture is moving across Central America this a.m. Looking at the surface analysis from TAFB, I doubt this is from that shortwave / forecasted low pple were looking at earlier this week.



Edit: Sorry, forgot the analysis map.... lol
Member Since: 25.10.2005 Posts: 19 Comments: 20742
1039. SNOWARMER
29. huhtikuuta 2010 klo 06:53 (GMT)
WW2 US Navy vessels were commonly equipped to spread bunker oil on the surface of the sea, typically at the bow of the vessel in order to calm the seas:

The spillage of oil into the sea hasn't had a good press in recent years following the many ecological disasters caused by wrecked tankers discharging thousands of tons of crude oil into the world's oceans. In earlier times, the pouring of modest quantities of oil into the sea was done deliberately in order to forestall rough seas. This phrase alludes to the calming effect of that oil has on wave action as it spreads over the surface of the sea. Very small quantities of oil can cover a surprisingly large area as it spreads into a layer just a few molecules in thickness. The surface tension of the oil layer has an effect similar to that of a thin skin and is highly effective at calming 'troubled' water.
Member Since: 10.02.2010 Posts: 0 Comments: 29
1038. Motttt
29. huhtikuuta 2010 klo 05:54 (GMT)
Thanks Matt.. poker coming up next on tv
Member Since: 10.09.2001 Posts: 0 Comments: 213
1037. tornadodude
29. huhtikuuta 2010 klo 05:47 (GMT)
Quoting Motttt:
Me Too .. You can learn a lot there


definitely, anyway, im off to bed, have a good one!
Member Since: 28.06.2006 Posts: 24 Comments: 8185
1036. Motttt
29. huhtikuuta 2010 klo 05:44 (GMT)
Me Too .. You can learn a lot there
Member Since: 10.09.2001 Posts: 0 Comments: 213

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Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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