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4/27-4/28 Tornado Outbreak Damage Assessment Thread


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No PNS yet, but the map on BMX's site confirms Tuscaloosa-BHM as EF4, Calhoun/St. Clair as EF3, and the two other Marion Co tornadoes as EF3?

Kinda surprising as I expected Calhoun/St. Clair to be rated an EF4...

EDIT: just released:

PUBLIC INFORMATION STATEMENT

NATIONAL WEATHER SERVICE BIRMINGHAM AL

1220 AM CDT MON MAY 2 2011

...UPDATED FOR SHOTSVILLE TORNADO FINALIZED AS EF-3 RATING...

...UPDATED FOR TUSCALOOSA/BIRMINGHAM TORNADO FINALIZED AS A HIGH END

EF-4 RATING...

...UPDATED FOR HALEYVILLE TORNADO FINALIZED AS EF-3 RATING...

...UPDATED FOR ARGO/SHOAL CREEK/OHATCHEE/FORNEY TORNADO FINALIZED AS

EF-3 RATING...

NATIONAL WEATHER SERVICE METEOROLOGISTS WILL CONTINUE THE ASSESSMENT

OF STORM DAMAGE FROM A TRAGICALLY HISTORIC DAY OF TORNADIC ACTIVITY

AND SEVERE WEATHER ACROSS CENTRAL ALABAMA ON WEDNESDAY APRIL 27TH. A

NATIONALLY RECOGNIZED STORM DAMAGE EXPERT WILL CONTINUE ASSISTING US

IN EXAMINING THE LOCATIONS OF THE MOST EXTREME DAMAGE TO ENSURE WE

PROVIDE THE MOST ACCURATE ASSESSMENT OF THIS EVENT AS POSSIBLE.

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A decade ago it wouldn't have.

Yeah I don't know, I mean reading the PNS with all the tornadoes they seem contradicting from one tornado to the next, and if you ask me, looking at the damage of Hackleburg and comparing it to Tuscaloosa/Pleasant Grove, the damage is fairly equal in destruction if anything the Tuscaloosa/Pleasant Grove damage is worse.

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Yeah I don't know, I mean reading the PNS with all the tornadoes they seem contradicting from one tornado to the next, and if you ask me, looking at the damage of Hackleburg and comparing it to Tuscaloosa/Pleasant Grove, the damage is fairly equal in destruction if anything the Tuscaloosa/Pleasant Grove damage is worse.

Tim Marshall did the surveys and he helped with the Tuscaloosa, Birmingham, and Hackleburg tornadoes and I know he is very good at his work.

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I'll be honest, I'm shocked that Tuscaloosa to Birmingham is staying EF-4. I also agree with thewxmann that the St. Clair county tornado should have been an EF-4.

They do say this in the latest PNS...

ADDITIONAL EVALUATION OF THE DAMAGE IN TUSCALOOSA AND JEFFERSON COUNTY WILL

CONTINUE TODAY TO DETERMINE IF THE RATING NEEDS TO BE INCREASED. MORE DETAIL

ON THE SURVEY RESULTS WILL BE UPDATED WHEN THEY BECOME AVAILABLE.

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Yeah I don't know, I mean reading the PNS with all the tornadoes they seem contradicting from one tornado to the next, and if you ask me, looking at the damage of Hackleburg and comparing it to Tuscaloosa/Pleasant Grove, the damage is fairly equal in destruction if anything the Tuscaloosa/Pleasant Grove damage is worse.

Yeah iono. I dont want to play blackjack here ( :P ) but I don't understand their ratings of the BHM and the St. Clair tornadoes, moreso the latter. I mean if the STL tornado earlier this year got EF4 and the damage there didn't look half as bad as some of the damage pics I've seen of the latter tornado. They retain the statement of the "well-built" home being "nearly swept clean of everything".

Moreover the inconsistencies between WFO's is disconcerting. HUN, MEG and JAN slapped an EF4 on damage that looked legitimately EF4. BMX has to go through deliberations. And FFC just doesnt give them out... some of the damage I've seen is clearly EF4'ish and Ringgold ought to be EF5.

I understand they are the experts, but man... I dunno about these ratings... there is a HUGE jump between an EF3 and EF4 in the record books.... Not to mention the WFO inconsistencies.

/soapbox

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They do say this in the latest PNS...

ADDITIONAL EVALUATION OF THE DAMAGE IN TUSCALOOSA AND JEFFERSON COUNTY WILL

CONTINUE TODAY TO DETERMINE IF THE RATING NEEDS TO BE INCREASED. MORE DETAIL

ON THE SURVEY RESULTS WILL BE UPDATED WHEN THEY BECOME AVAILABLE.

Yeah I noticed that but it contradicts the finalized EF-4 header, plus they have had that in on every PNS so it could be possible that they forgot to take it out.

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Yeah iono. I dont want to play blackjack here ( :P ) but I don't understand their ratings of the BHM and the St. Clair tornadoes, moreso the latter. I mean if the STL tornado earlier this year got EF4 and the damage there didn't look half as bad as some of the damage pics I've seen of the latter tornado. They retain the statement of the "well-built" home being "nearly swept clean of everything".

Moreover the inconsistencies between WFO's is disconcerting. HUN, MEG and JAN slapped an EF4 on damage that looked legitimately EF4. BMX has to go through deliberations. And FFC just doesnt give them out... some of the damage I've seen is clearly EF4'ish and Ringgold ought to be EF5.

I understand they are the experts, but man... I dunno about these ratings... there is a HUGE jump between an EF3 and EF4 in the record books...

/soapbox

The ratings from FFC as per usual are bogus, plain and simple.

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Yeah iono. I dont want to play blackjack here ( :P ) but I don't understand their ratings of the BHM and the St. Clair tornadoes, moreso the latter. I mean if the STL tornado earlier this year got EF4 and the damage there didn't look half as bad as some of the damage pics I've seen of the latter tornado. They retain the statement of the "well-built" home being "nearly swept clean of everything".

Moreover the inconsistencies between WFO's is disconcerting. HUN, MEG and JAN slapped an EF4 on damage that looked legitimately EF4. BMX has to go through deliberations. And FFC just doesnt give them out... some of the damage I've seen is clearly EF4'ish and Ringgold ought to be EF5.

I understand they are the experts, but man... I dunno about these ratings... there is a HUGE jump between an EF3 and EF4 in the record books...

/soapbox

:lmao:

That being said though, I do agree with a lot of this, the Georgia tornado certainly to me as to you should have been rated higher in Ringgold, the areas to the NE of it were rated EF-4.

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Yeah I noticed that but it contradicts the finalized EF-4 header, plus they have had that in on every PNS so it could be possible that they forgot to take it out.

That's true.

Wording in the text was only slightly changed from the last PNS.

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That's true.

Wording in the text was only slightly changed from the last PNS.

Yeah, the whole thing seems a little odd, like what caused them to decide it was an EF-4 vs an EF-5. I mean they didn't really change the section about the tornado in the PNS. Comparing their PNS with HUN, it is night and day with the discussion/reasoning for classifications.

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I agree with most of you on these ratings. I am going to write Tim Marshall and ask him why? It stated from like two of these two tornadoes one in Birmingham area and the other in the Spartanburg area where they stated in their statement "well-built" homes swept clean off their foundations and they both get rated high-end EF3 does not make a lot of sense to me either. As far as the Tuscaloosa/Birmingham tornado seems very borderline EF4/EF5 but where to draw the line is almost impossible to tell.

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FWIW, embedded in the fine print of the Tuscaloosa-BHM section...

DETAILED DAMAGE INSPECTION HAS REVEALED A MAXIMUM OF EF-4 DAMAGE FROM EAST OF HOLT...NEAR CONCORD...AND THE PLEASANT GROVE AREAS.

Holt is to the east of Tuscaloosa... have they not rated Tuscaloosa or is Tuscaloosa not even EF4?

That would be beyond the absurd.

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What we've learned from mobile, Doppler radar studies is that the error bars on EF scale ratings are at least one EF scale rating, so I wouldn't be all that worried by one particular, boder-line tornado getting an n rating instead of an n+1 rating.

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FWIW, embedded in the fine print of the Tuscaloosa-BHM section...

DETAILED DAMAGE INSPECTION HAS REVEALED A MAXIMUM OF EF-4 DAMAGE FROM EAST OF HOLT...NEAR CONCORD...AND THE PLEASANT GROVE AREAS.

Holt is to the east of Tuscaloosa... have they not rated Tuscaloosa or is Tuscaloosa not even EF4?

Now that is a good question, but when you put out a finalized number its hard to make the first half of that question become feesible. However the 2nd half of the question would be astounding if that was true.

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I'm hopeful it's just someone who's dead tired at the keyboard, and they'd catch these little things like "that's final now, can go remove the preliminary wording" if they were conscious.

It would be nice to have some consistency between the offices. Sometime's it's a great detailed narrative, sometimes it's barely more than "touchdown 4 miles north of townA, continued to just south of townB, destroyed 5 mobile homes and injured 2."

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TORNADO 9...CORDOVA TORNADO (WALKER COUNTY)

PRELIMINARY DATA...

EVENT DATE: APRIL 27, 2011

EVENT TYPE: EF-4 TORNADO

ESTIMATED PEAK WINDS (MPH): AROUND 170

INJURIES/FATALITIES: DOZENS OF INJURIES/7 FATALITIES.

EVENT START LOCATION AND TIME: TO BE DETERMINED

SURVEY START LOCATION AND TIME: 33.7553/-87.1846 AT 456 PM.

SURVEY END LOCATION: 33.8303/-87.0580

EVENT END LOCATION AND TIME: TO BE DETERMINED

DAMAGE PATH LENGTH (IN MILES): 8.9 MILES SURVEYED SO FAR

WIDTH: TO BE DETERMINED

NOTE: THIS DATA IS PRELIMINARY. TRACK COULD GO AS FAR BACK AS

PICKENS COUNTY AND EXTENDS INTO CULLMAN COUNTY AND POSSIBLY AS FAR

AS BLOUNT COUNTY.

NATIONAL WEATHER SERVICE METEOROLOGISTS SURVEYED AND RATED A PORTION

OF THE TORNADO TRACK IN WALKER COUNTY. IT HAS BEEN DETERMINED THAT

THIS PORTION OF THE DAMAGE WAS CONSISTENT WITH A VIOLENT TORNADO.

THE SURVEYED TORNADO TRACK WAS NOTED FROM DOWNTOWN CORDOVA IN A 1/2

MILE WIDE SWATH OF EF-3 DAMAGE. FROM THERE...THE TORNADO TRACKED TO

THE NORTHEAST ACROSS BURTON CHAPEL LOOP ROAD AND CROSSED THE

MULBERRY FORK OF THE BLACK WARRIOR RIVER. AS IT CROSSED MOUNTAINVIEW

ROAD...THE TORNADO INCREASED TO A VIOLENT EF-4 RATING...AS IT

DESTROYED 2 SINGLE-WIDE MOBILE HOMES...AS WELL AS A SINGLE FAMILY

HOME. ONE OF THE UNDERCARRIAGES IS MISSING...HAVING BEEN TOSSED AT

LEAST 500 YARDS. AT THIS SITE...A SMALL BULLDOZER WAS FLIPPED

OVER...A PICKUP TRUCK WAS TOSSED 200 YARDS AND AN INTERNATIONAL 4700

DUMP TRUCK WAS TOSSED 50 YARDS BEING DESTROYED UPON LANDING. A 2 TON

UTILITY TRAILER FROM THIS LOCATION WAS FOUND A MILE AWAY...WITH A

2.5 FOOT IMPACT CRATER WHERE IT LANDED. AS THE TORNADO NEARED OLD

HIGHWAY 78...IT TOSSED TWO DOUBLE-WIDE MOBILE HOMES AT LEAST 100

YARDS...BECOMING AIRBORNE WITH THE FRAMES ON TOP OF THE DEBRIS. THE

TORNADO CONTINUED TRACKING TOWARD SIPSEY...WHERE AND UNANCHORED

DOUBLE-WIDE MOBILE HOME WAS TOSSED 100 FEET UP A 50 FOOT EMBANKMENT.

THE TORNADO CONTINUED AT A MINIMUM OF EF-2 STRENGTH TO THE

EAST...THEN INTENSIFIED AS IT CAME OFF A BLUFF...DESTROYING A HOME.

NUMEROUS HOMES AND MANUFACTURED HOMES WERE EITHER DAMAGED OR

DESTROYED ALONG THIS PATH. THE TORNADO IS BELIEVED TO HAVE CONTINUED

NORTHEAST INTO CULLMAN COUNTY...WHERE NWS HUNTSVILLE FOUND A

CONTINUED PATH AND POSSIBLY INTO PARTS OF NORTHWEST BLOUNT COUNTY.

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Yeah I about gave up. I don't normally, but this is insane. I do know we are up to 9 EF4s and 2 EF5s.

Yeah I don't blame you there is just so many to count, I know that Knoxville alone had a bunch of EF-0s. At this point I wouldn't be entirely shocked if the final number ended up in the 170-190 range.

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Yeah I don't blame you there is just so many to count, I know that Knoxville alone had a bunch of EF-0s. At this point I wouldn't be entirely shocked if the final number ended up in the 170-190 range.

It's into the 160s. The hell is the HUN/BMX/MEG/JAN convergence region. All those long-trackers crossing 2-3 CWAs = pain.

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It's into the 160s. The hell is the HUN/BMX/MEG/JAN convergence region. All those long-trackers crossing 2-3 CWAs = pain.

My count is up to 169 from the 26-28th, but I did not go through to see which ones crossed CWA's, so the number is likely a handful too high.

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I'm hopeful it's just someone who's dead tired at the keyboard, and they'd catch these little things like "that's final now, can go remove the preliminary wording" if they were conscious.

It would be nice to have some consistency between the offices. Sometime's it's a great detailed narrative, sometimes it's barely more than "touchdown 4 miles north of townA, continued to just south of townB, destroyed 5 mobile homes and injured 2."

Tropical Cyclone Reports are the same way-- there's a huge range. Some are rich with details Re: the cyclone's core structure, impact, etc., while others are totally barebones.

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Now that is a good question, but when you put out a finalized number its hard to make the first half of that question become feesible. However the 2nd half of the question would be astounding if that was true.

Talked to a nice lady with NWS in Birmingham and she said there was EF4 damage found in the city of Tuscaloosa.

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It's into the 160s. The hell is the HUN/BMX/MEG/JAN convergence region. All those long-trackers crossing 2-3 CWAs = pain.

Yeah that would be like a tornado going from Hillsdale County to Jackson County to Washtenaw County, would pass through 3 CWAs. Also if its in the 160s now, I bet we settle somewhere around 175, which is simply amazing. What is even more amazing is that so far this year we have had 3 outbreaks of tornadoes with over 80 in each. I knew this year would be active, I never in my wildest dreams would have thought it would have been this bad.

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