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April 12 Severe Event


joshwx2003
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Mesoscale Discussion 0371
   NWS Storm Prediction Center Norman OK
   0850 PM CDT Sun Apr 12 2020

   Areas affected...central Alabama

   Concerning...Tornado Watch 109...110...

   Valid 130150Z - 130245Z

   The severe weather threat for Tornado Watch 109, 110 continues.

   SUMMARY...Storms are intensifying as they move into central Alabama,
   with local enhancement to the tornado risk evident.

   DISCUSSION...Latest radar loop shows a couple of storms intensifying
   within the broader north-northwest to south-southeast band of storms
   crossing Alabama and southeast Mississippi.  The two strongest
   storms -- one moving into Cullman County and the other crossing
   Tuscaloosa county -- appear most intense at this time, with the
   southern storm likely having produced a tornado recently (70 kt
   rotational velocity and a small CC minimum have been observed within
   the past 15 minutes).  As this storm continues moving
   north-northeastward, through the very favorable thermodynamic and
   kinematic environment that remains in place, the potential for a
   strong tornado and/or damaging wind gusts has increased for areas
   near and northwest of Birmingham.

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From the TN valley thread: confirmed TOG in Polk County, TN

..A TORNADO WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT FOR CENTRAL
POLK COUNTY...

At 1013 PM EDT, a confirmed tornado was located 8 miles southeast of
Benton, moving northeast at 65 mph.

HAZARD...Damaging tornado.

SOURCE...Law enforcement confirmed tornado.

IMPACT...Flying debris will be dangerous to those caught without
         shelter. Mobile homes will be damaged or destroyed. Damage
         to roofs, windows, and vehicles will occur.  Tree damage is
         likely.

Locations impacted include...
Archville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
 
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mcd0373.gif

 

https://www.spc.noaa.gov/products/md/md0373.html

 

Mesoscale Discussion 0373
   NWS Storm Prediction Center Norman OK
   1017 PM CDT Sun Apr 12 2020

   Areas affected...northern Georgia...southeast Tennessee...western
   and central portions of North and South Carolina

   Concerning...Tornado Watch 113...

   Valid 130317Z - 130445Z

   The severe weather threat for Tornado Watch 113 continues.

   SUMMARY...Severe/tornado risk continues across WW 112 and 113.

   DISCUSSION...While earlier, more cellular convection has
   weakened/moved out of WW 112/113, an organized band of storms --
   with embedded rotational radar signatures -- moving across northern
   Alabama will continue shifting east into northwest Georgia/southeast
   Tennessee over the next hour.  Some low-level moistening has
   occurred across the area on strong southerly surface flow, with
   upper 60s dewpoints now extending to the GA/TN border, which has
   boosted mixed-layer cape to near 1000 J/kg per RUC-based objective
   analysis.  

   The latest KFFC WSR-88D VWP shows extreme low-level and deep-layer
   shear (53 kt sfc-1 km and 86 kt 0-6 km), and therefore -- in
   conjunction with increased buoyancy -- expect risk for tornadoes and
   locally damaging winds to continue.

   Meanwhile east of the existing watches, into the western Carolinas,
   similarly strong low-level and deep-layer shear is indicated.  While
   instability is weaker, a gradual increase in CAPE with time appears
   to be fueling small cellular development.  With this convection
   possibly increasing in coverage/intensity with time, a new tornado
   watch may become necessary.

   ..Goss.. 04/13/2020

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...RAH...RNK...CAE...GSP...MRX...FFC...BMX...
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I really wish metro ATL and more of the northern ATL suburbs would have been placed under a Tornado Watch prior to the 11PM news cycle. 

Folks are going to go to bed tonight not even knowing about the Tornado Watch that's likely inbound. Hopefully they've been paying attention, but I wish they would have pulled the trigger by now.

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uh oh

Severe Weather Statement
National Weather Service Morristown TN
1125 PM EDT Sun Apr 12 2020

TNC065-130345-
/O.CON.KMRX.TO.W.0010.000000T0000Z-200413T0345Z/
Hamilton TN-
1125 PM EDT Sun Apr 12 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT FOR
SOUTHEASTERN HAMILTON COUNTY...

At 1125 PM EDT, a confirmed large and extremely dangerous tornado was
located near Ringgold, moving east at 45 mph.

This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

IMPACT...You are in a life-threatening situation. Flying debris may
         be deadly to those caught without shelter. Mobile homes
         will be destroyed. Considerable damage to homes,
         businesses, and vehicles is likely and complete destruction
         is possible.

This tornadic thunderstorm will remain over mainly rural areas of
southeastern Hamilton County, including the following locations...
Collegedale, East Brainerd, Ooltewah and Apison.

This includes Interstate 75 in Tennessee between mile markers 4 and
13.
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