Tornado kills ten in Mississippi

By: Dr. Jeff Masters , 1:22 PM GMT on April 25, 2010

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A powerful 1/2 to 1-mile wide tornado cut a path of enormous destruction across the state of Mississippi yesterday, killing at least ten and injuring dozens. It was the deadliest tornado in the U.S. since May 10, 2008, when an EF-4 tornado killed 22 people in Oklahoma and Missouri. The damage I've seen so far from photos of yesterday's tornado appears to be mainly of the EF-3 variety, though we will have to wait for the official damage surveys to be sure. The supercell thunderstorm that spawned the tornado or family of tornadoes maintained a continuous circulation from the time the tornado first touched down in Louisiana near the Mississippi border until the tornado reached the Alabama border. This is an extremely rare occurrence. If the 188-mile path of destruction across Mississippi was from a single tornado, it would rank as one of the longest tracks by a single tornado on record. The record of 219 miles is held by the deadliest tornado of all time, the great Tri-State Tornado of 1925 (though there is some dispute over whether this was one tornado or a family of tornadoes.) Our severe weather expert Dr. Rob Carver has a more complete analysis and imagery of yesterday's tornadoes.


Figure 1. Doppler radar storm-relative velocity of the mile-wide tornado that affected Yazoo City, Mississippi On April 24, 2010. This is an unusually wide and strong circulation for a supercell thunderstorm.

More severe weather expected today along the East Coast
The Storm Prediction Center (SPC) outlined a "Slight Risk" region of concern for severe weather today along the East Coast, from Maryland to Northern Florida. Yesterday, SPC had Mississippi underneath the first "High Risk" area of severe weather concern for the year. As usual, you can follow today's severe weather outbreak with our interactive tornado page and our severe weather page..


Figure 2. Severe weather reports for Saturday. Note the long line of red tornado reports extending across the state of Mississippi. These reports originated from a single supercell thunderstorm that spawned one or more tornadoes that carved out a 188-mile lone path of destruction across the state. Image credit: Storm Prediction Center.

Jeff Masters

Storm Lines (thomasanthony)
A quick line of storm clouds came over Lawrence around 7pm. I forgot to change my ISO back after shooting eagles earlier in low light thus a noisy shot.
Storm Lines
Tornado damage in Choctaw County (richardlove310)
Tornado damage in Choctaw County
Tornado damage in Choctaw County (richardlove310)
Tornado damage in Choctaw County

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Quoting BahaHurican:

Looks like I was right abt the Cuban effects, anyway.... does anybody know the incidence of tornados in Cuba?


They don't have them there... The U.S. has a trade embargo with Cuba and we aren't sharing any tornados with them.
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Hey everyone just got back it looks like the gulf is warming and with the 90s forecast here in florida we could be seeing more significant warming i dont like that one bit
Member Since: April 8, 2010 Posts: 15 Comments: 2572
topography can be key as it can disrupt inflow, enhance or diminish low level vorticity, or increase or decrease friction and therfor low level convergence (water/land contrasts are especially significant in this last aspect)
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Quoting Hurricanes101:


it was a joke, chill out lol


oh i know lol, i wasn't talking about hydrus :)
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Looks like I was right abt the Cuban effects, anyway.... does anybody know the incidence of tornados in Cuba?
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Quoting VAbeachhurricanes:


hahahahaha, doomcasters out is full force this year...


it was a joke, chill out lol
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Quoting hydrus:
Yes indeed. I caught 3 lb,s of shrimp yesterday and they were already cooked. :>


hahahahaha, doomcasters out is full force this year...
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Hey Stormchaser81!
Welcome to the team!
This season may be an interesting one...

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Quoting StormChaser81:


Topography is so important for strong Tornados to form.
Why does topography have an effect on tornadoes?
Member Since: September 27, 2007 Posts: 1 Comments: 21854
Quoting Buhdog:
Thanks Stormchaser for the banter! I just don't ever want to see massive releases down our river anymore regardless. They were supposed to build a huge retention pond for it..but I am not sure of its status. Hey southwest fl...was that nasty this morning or what? My retriever tried to turn me into a Kangaroo in bed jumping in my lap from the thunder!


Hey im with you on that, I cant stand what they did to the ever glades for sugar.
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Thanks Stormchaser for the banter! I just don't ever want to see massive releases down our river anymore regardless. They were supposed to build a huge retention pond for it..but I am not sure of its status. Hey southwest fl...was that nasty this morning or what? My retriever tried to turn me into a Kangaroo in bed jumping in my lap from the thunder!
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Quoting Buhdog:


StormChaser...I really respect you so I am only engaging in stimulating thought, not to try and argue ( I only know what "I" have read and "I" have seen. Is this not man made red tide(sorry it is wiki) quoting- Red Tides"


A red tide
"Red tide" is a term often used to describe HABs in marine coastal areas [13], as the dinoflagellate species involved in HABs are often red or brown, and tint the sea water to a reddish colour. The more correct and preferred term in use is harmful algal bloom, because:
these blooms are not associated with tides
not all algal blooms cause reddish discoloration of water
not all algal blooms are harmful, even those involving red discolouration [14]
[edit]Causes of HABs
It is unclear what causes HABs; their occurrence in some locations appears to be entirely natural,[15] while in others they appear to be a result of human activities[16] Furthermore, there are many different species of algae that can form HABs, each with different environmental requirements for optimal growth. The frequency and severity of HABs in some parts of the world have been linked to increased nutrient loading from human activities. In other areas, HABs are a predictable seasonal occurrence resulting from coastal upwelling, a natural result of the movement of certain ocean currents.


I'm also doing studies showing how the really bad 2005 red tide event was helped by hurricanes coming through the gulf and forcing red tide out in the gulf up against the west coast of Florida. Once its against the west coast it rides the gulf current and enters canals, rivers mouths, and other open water bodies hooked to the ocean.

I you want actual really science intense stuff I have it, just WU mail me.
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Quoting Drakoen:
Dangerous warming continues:

Yes indeed. I caught 3 lb,s of shrimp yesterday and they were already cooked. :>
Member Since: September 27, 2007 Posts: 1 Comments: 21854
>

Quoting Buhdog:


StormChaser...I really respect you so I am only engaging in stimulating thought, not to try and argue ( I only know what "I" have read and "I" have seen. Is this not man made red tide(sorry it is wiki) quoting- Red Tides"


A red tide
"Red tide" is a term often used to describe HABs in marine coastal areas [13], as the dinoflagellate species involved in HABs are often red or brown, and tint the sea water to a reddish colour. The more correct and preferred term in use is harmful algal bloom, because:
these blooms are not associated with tides
not all algal blooms cause reddish discoloration of water
not all algal blooms are harmful, even those involving red discolouration [14]
[edit]Causes of HABs
It is unclear what causes HABs; their occurrence in some locations appears to be entirely natural,[15] while in others they appear to be a result of human activities[16] Furthermore, there are many different species of algae that can form HABs, each with different environmental requirements for optimal growth. The frequency and severity of HABs in some parts of the world have been linked to increased nutrient loading from human activities. In other areas, HABs are a predictable seasonal occurrence resulting from coastal upwelling, a natural result of the movement of certain ocean currents.


Man made if you think about man introducing the nutrients. but red tide is natural occurring organisms. The nutrients do make them explode in population.

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Looking at current trends... By the time June 1 gets here the Gulf should be caught up and at normal temps
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Shelf waters of the Gulf of Mexico warming back up to normal levels.

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Dangerous warming continues:

Member Since: October 28, 2006 Posts: 57 Comments: 30619
Quoting StormChaser81:


Red Tide starts in deep water in the Gulf of Mexico starts to multiple and slowly moves through the water column to the surface then the wind and currents push it around the gulf. If it gets near a certain current the flow will usually push it to land.

Your seeing a different type of algal bloom from high nitrate values coming from the Big O.

But red tide doesnt start near shore.


StormChaser...I really respect you so I am only engaging in stimulating thought, not to try and argue ( I only know what "I" have read and "I" have seen. Is this not man made red tide(sorry it is wiki) quoting- Red Tides"


A red tide
"Red tide" is a term often used to describe HABs in marine coastal areas [13], as the dinoflagellate species involved in HABs are often red or brown, and tint the sea water to a reddish colour. The more correct and preferred term in use is harmful algal bloom, because:
these blooms are not associated with tides
not all algal blooms cause reddish discoloration of water
not all algal blooms are harmful, even those involving red discolouration [14]
[edit]Causes of HABs
It is unclear what causes HABs; their occurrence in some locations appears to be entirely natural,[15] while in others they appear to be a result of human activities[16] Furthermore, there are many different species of algae that can form HABs, each with different environmental requirements for optimal growth. The frequency and severity of HABs in some parts of the world have been linked to increased nutrient loading from human activities. In other areas, HABs are a predictable seasonal occurrence resulting from coastal upwelling, a natural result of the movement of certain ocean currents.
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Quoting toontown:
Be aware that there is plenty of cold air available for severe weather generation.

We awoke to snow on Sunday (April 26th) morning, and that system should be heading south.


I feel for you is Saskatchewan, but please, please, please, keep the snow :0)!!
Member Since: August 25, 2009 Posts: 20 Comments: 6785
Quoting Buhdog:


You may be able to back up your info with some articles...but as someone who has gone thru it several times, It always blooms when we get onshore winds for an extended period of time in conjunction with large releases from Lake O. IMO I think there is STRONG connection between the Red Tide in Ft Myers where the calusa dumps because of man. The nitrates that all flow into Lake O and down the canals to our river are not natural sorry.


Red Tide (karenia brevis) starts in deep water in the Gulf of Mexico starts to multiple and slowly moves through the water column to the surface then the wind and currents push it around the gulf. If it gets near a certain current the flow will usually push it to land.

Your seeing a different type of algal bloom from high nitrate values coming from the Big O.

But red tide doesnt start near shore.

You are very right about the algal blooms in the rivers from dumping and the sugar cane production (i.e. fertilizers).

The onshore winds is what brings it to your area from out in the Gulf and Atlantic after the Gulf current brings it to the East Coast.
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Quoting TampaTom:
A fascinating read...



Topography is so important for strong Tornados to form.
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Quoting StormChaser81:
Red Tides are Natural. Algal Blooms have been around for a long time.

We might be changing the ocean characteristics and making red tide worse, but regardless its natural.


You may be able to back up your info with some articles...but as someone who has gone thru it several times, It always blooms when we get onshore winds for an extended period of time in conjunction with large releases from Lake O. IMO I think there is STRONG connection between the Red Tide in Ft Myers where the calusa dumps because of man. The nitrates that all flow into Lake O and down the canals to our river are not natural sorry.
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No steering currents over the area of low pressure north of Panama, for the time being there should be no movement associated with that AOI.
Member Since: September 2, 2009 Posts: 130 Comments: 21194
A fascinating read...

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Quoting toontown:
Be aware that there is plenty of cold air available for severe weather generation.

We awoke to snow on Sunday (April 26th) morning, and that system should be heading south.



Florida translates to high 70's for Wednesday and high 50's to low 60's for Wed night.
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Be aware that there is plenty of cold air available for severe weather generation.

We awoke to snow on Sunday (April 26th) morning, and that system should be heading south.

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Red Tides are Natural. Algal Blooms have been around for a long time.

We might be changing the ocean characteristics and making red tide worse, but regardless its natural.
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Quoting Jeff9641:


That moisture is coming north bound next week but where is the question?


You're not the only one wondering where it'll go. I guess pick your poison...


EXTENDED FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
229 PM EDT MON APR 26 2010

VALID 12Z THU APR 29 2010 - 12Z MON MAY 03 2010


PRELIMINARY UPDATE...

RELIED HEAVILY ON THE 00Z/26 EUROPEAN CENTRE ENSEMBLE MEAN TO
UPDATE THE PRELIMINARY FRONTS AND PRESSURES FOR DAYS 3 THROUGH 7.
THE ECENS MEAN IS NOT FUNDAMENTALLY DIFFERENT THAN THE 00Z/26
DETERMINISTIC ECMWF...BUT AFFORDS A SENSIBLE CORRECTIVE TO THE
EPHEMERAL SYNOPTIC NUANCES THAT PLAGUE A HIGH RESOLUTION MODEL
FROM RUN TO RUN. THE ECENS MEAN HAS PROVEN ITSELF THE GOLD
STANDARD THE LAST FOUR MONTHS FOR PMSL ANOMALY CORRELATION
VERIFICATION OVER CENTRAL NORTH AMERICA...OUTPERFORMING THE GFS
AND GEFS MEAN AS EARLY AS DAY 3...AND THE ECMWF BY DAY 4. EVEN AT
DAY 7...IT HAS SCORED ABOVE .70 ON STANDARD ANOMALY CORRELATION
OVER THE LAST FOUR MONTHS ACCORDING TO IN-HOUSE VERIFICATION. FOR
THE CURRENT FORECAST...THE BIG DIFFERENCE BETWEEN THE EUROPEAN
CENTRE GUIDANCE AND THE GFS/GEFS MODELS IS WHERE THE HEAVY RAINS
SET UP OVER THE SOUTHEAST. THE EUROPEAN GUIDANCE KEEPS THE HEART
OF THE ACTION HERDED CLOSER TO THE LOWER TENNESSEE VALLEY BY THE
ATLANTIC SUBTROPICAL RIDGE...WITH THE GFS/GEFS GUIDANCE SLOPPING
THE ACTIVITY INTO THE SOUTHERN APPALACHIANS. WITH SUCH A WELL
ENTRENCHED WESTERN TROUGH...HAVE MORE FAITH IN THE SOLUTIONS THAT
KEEP THE INTEGRITY OF THE SUBTROPICAL RIDGE OVER THE SOUTHEAST.

FINAL...

THE 12Z/26 GFS AND GEFS MEAN ARE STILL HANGING ONTO THEIR
SOLUTIONS FROM 12 HOURS AGO FOR THE MOST PART...AND ARE NOT IN
PARTICULARLY GOOD HARMONY THEMSELVES. HOW THE QUASI-STATIONARY
LONGWAVE CONFIGURES ITSELF OVER THE CENTRAL UNITED STATES WILL BE
CRITICAL FOR PRECIPITATION...CONSIDERING THE TREMENDOUS INFLOW OF
MOISTURE FROM THE GULF OF MEXICO. WILL CONTINUE TO RELY ON THE
BETTER PERFORMING ECENS MEAN...WHICH DIRECTS THE GULF FIREHOSE AT
THE TENNESSEE VALLEY.


CISCO




Last Updated: 229 PM EDT MON APR 26 2010


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Quoting Jeff9641:


Again this is why I don't live up north. How depressing it's late April!


Jeff,I'll freak out if I see one snowflake,we've been almost 6 degrees above normal for the month of April,snow is not in my vocabulary at this point.
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Quoting Buhdog:


Here here....As a calusa liver on'er (just made that up) Killed all our damn blue crab and gave us red tide! Hate them sugar factories...
They have been polluting the Everglades for decades.
Member Since: September 27, 2007 Posts: 1 Comments: 21854
Quoting Jeff9641:


I know and that is what I said earlier but what this will do for us is aid in daily seabreeze convection. This is a classic interior seabreeze collision setup day after day. Temps 90 plus with 70 dewpoints with SSE wind and presto.


Especially with sea breeze storms you get slow movers producing heavy amounts of rain in confined areas, if it just a sea breeze event.
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our tuesday night forecast send chills down my back.

Tuesday Night: A slight chance of rain showers before 1am, then a slight chance of snow showers. Mostly cloudy, with a low around 33. West northwest wind between 10 and 15 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
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Received pics of the Deep Water Horizon going down in the Gulf, thing listed to one side for hours and then buckled upon its own weight. Fire and smoke on top of water.
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Quoting Jeff9641:


That moisture is coming north bound next week but where is the question?


Some of the models are blocking the Moisture feed for Florida showing it really in LA/MS.
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More footage of the EF4 that hit Yazoo City.
Link

Video by Marlon Davis.
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Quoting weathermanwannabe:
Just came back from lunch and heard a Coast Guard spokeman say on NPR that the oil slick in the Gulf is 600 miles in diameter and 30 miles from the coast..........Great timing in terms of the renewed debate on offshore drilling....Lets pray that the slick does not make it to the coastline and become an ecological disaster for the region.
Amen to that.
Member Since: September 27, 2007 Posts: 1 Comments: 21854
Quoting SomeRandomTexan:
Hey Homeless!!

I agree that setup with the high would be exactly what we don't need.


Yeah at the very least it means the heat is on. Apparently if we don't get any more rain this'll be the driest April on record. We'll take the rain but nothing else please. :)
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just let me know when the bermuda high looks like its gonna cause all the storms to go into the GOM :)
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Quoting Jeff9641:


Nothing significant but seabreeze activity for sure. I would watchout for a deep tropical feed come next week as the high will be key to where all this rain ends up.


Hey!

I was talking about during the height of the season, it would not be good for the high pressure to be set up like that. :)
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I just want to say a lot of you people on here are really REALLY good at predicting things! I am often amazed by it. This tornado outbreak for instance. Its getting so bad now when we are wondering about a big horse ride on the weekend and there is a chance of bad weather my husband says "check on the weather blog and see what they are saying" haha. so keep up the great work :)when you live in a spring break destination you cant ever count on the local news, they don't want to scare away tourist dollars by forecasting bad weather.
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Quoting indianrivguy:


It's not a tough call at all.. there was no natural connection between Okeechobee Lake and the Caloosahatchee, or the St. Lucie estuaries. Because all water issues south of Orlando default to big sugar, the water is not allowed to go where it went naturally.. the Florida Everglades. The ONLY reason the estuaries get devastated by these releases is to protect sugar interests.


Here here....As a calusa liver on'er (just made that up) Killed all our damn blue crab and gave us red tide! Hate them sugar factories...
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I can't believe we are talking tropical and it is not even May yet.... Just on preliminaries this looks to be a doozy of season :(
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Hey Homeless!!

I agree that setup with the high would be exactly what we don't need.
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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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