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Tallis Rockwell

Severe Weather for 4/19-4/23

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BULLETIN - EAS ACTIVATION REQUESTED  
TORNADO WARNING  
NATIONAL WEATHER SERVICE NORMAN OK  
539 PM CDT WED APR 22 2020  
  
THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A  
  
* TORNADO WARNING FOR...  
  NORTHEASTERN BRYAN COUNTY IN SOUTHEASTERN OKLAHOMA...  
  SOUTH CENTRAL ATOKA COUNTY IN SOUTHEASTERN OKLAHOMA...  
  
* UNTIL 630 PM CDT.  
  
* AT 539 PM CDT, A CONFIRMED LARGE AND EXTREMELY DANGEROUS TORNADO  
  WAS LOCATED NEAR ARMSTRONG, MOVING EAST AT 30 MPH.  
  
  THIS IS A PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!  
  
  HAZARD...DAMAGING TORNADO.  
  

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Tornado Warning
OKC005-013-222330-
/O.NEW.KOUN.TO.W.0020.200422T2239Z-200422T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Norman OK
539 PM CDT Wed Apr 22 2020

The National Weather Service in Norman has issued a

* Tornado Warning for...
  Northeastern Bryan County in southeastern Oklahoma...
  South central Atoka County in southeastern Oklahoma...

* Until 630 PM CDT.

* At 539 PM CDT, a confirmed large and extremely dangerous tornado
  was located near Armstrong, moving east at 30 mph.

  This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!

  HAZARD...Damaging tornado.

  SOURCE...Weather spotters 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.

* Locations impacted include...
  Caddo, Bokchito, Bennington, Kenefic and Armstrong.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, an extremely dangerous and potentially deadly tornado is
on the ground. To protect your life, TAKE COVER NOW! Move to a storm
shelter, safe room 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.

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Tornado Warning
TXC373-455-222330-
/O.NEW.KHGX.TO.W.0015.200422T2245Z-200422T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Houston/Galveston TX
545 PM CDT Wed Apr 22 2020

The National Weather Service in League City has issued a

* Tornado Warning for...
  East central Trinity County in southeastern Texas...
  Central Polk County in southeastern Texas...

* Until 630 PM CDT.

* At 545 PM CDT, a confirmed large and extremely dangerous tornado
  was located near Sebastopol, or 18 miles northwest of Livingston,
  moving east at 40 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.

* The tornado will be near...
  Seven Oaks around 610 PM CDT.
  Corrigan around 615 PM CDT.

Other locations impacted by this tornadic thunderstorm include Moscow
and Leggett.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a large, extremely dangerous and potentially deadly
tornado is on the ground. To protect your life, 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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

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I was on the Sam Houston National Forest cell earlier when it passed near Bryan, but let it go as it continued east into the more dense forests near I-45, so it's fitting that it would ramp up after I dropped off it. But man, once it was able to fully root down to the surface and take advantage of the low level shear, it took off. Probably needed the time for it to warm to >80ºF (82/71 at Huntsville the last hour, with dews as high as 75/76ºF just to the south) for it to overcome the low level lapse rates.

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Just now, Bob's Burgers said:

I fear this tornado hit a lot of homes

Yeah, there's a decent amount of home on the northern and NW side of Onalaska. 

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 Mesoscale Discussion 0444
   NWS Storm Prediction Center Norman OK
   0538 PM CDT Wed Apr 22 2020

   Areas affected...northeast Texas

   Concerning...Tornado Watch 134...

   Valid 222238Z - 230015Z

   The severe weather threat for Tornado Watch 134 continues.

   SUMMARY...A couple of storms may develop across north Texas this
   afternoon and evening. All severe threats will be possible with any
   storms that develop.

   DISCUSSION...22z observations and surface analysis show a few deeper
   updrafts beginning to coalesce along and ahead of a bulging dryline
   near the DFW metroplex. Storms have struggled to mature thus far,
   which suggests that some MLCINH remains across the area, and this is
   also supported by the modified 19z FWD observed sounding. Upper
   level lift from the shortwave trough moving through the southern
   Plains will likely continue to erode the remaining inhibition and
   could support the development of a few storms. The environment
   downstream is moist and unstable with dewpoints around 70 F and
   upper level wind profiles favor a discrete supercell mode with
   effective shear of 60-70 kt. All severe threats will be possible
   with any storms that are able to develop. A more favored corridor of
   tornado potential could develop where low level shear increases with
   eastward extent closer to the warm front. Here, surface winds are
   more backed and ESRH is greater around 200-300 m2/s2.

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SUMMARY...SUMMARY   BASED ON RECENT RADAR AND ENVIRONMENTAL DATA, A STRONG TO INTENSE   TORNADO WITH POTENTIAL PEAK WINDS OF 130 TO 165 MPH (EF2-EF3) IS   LIKELY ONGOING.     DISCUSSION...DISCUSSION   RECENT RADAR SIGNATURES FROM KGRK AS OF 2250Z REVEAL AN INTENSE   SUPERCELL CHARACTERIZED BY A 0.5 DEGREE ROTATIONAL VELOCITY OF AT   LEAST 70 KT. A TORNADIC DEBRIS SIGNATURE HAS ALSO BEEN NOTED ON   RECENT RADAR SCANS. THESE SIGNATURES ARE OCCURRING IN AN ENVIRONMENT   CHARACTERIZED BY STP BETWEEN 5 AND 6. PREVIOUS SIGNATURES WITHIN   SIMILAR ENVIRONMENTS PRODUCED TORNADO-DAMAGE-ESTIMATED WIND SPEEDS   FROM 130 TO 165 MPH AND CONFIDENCE IS HIGH FOR A STRONG TO INTENSE   TORNADO. A LONGER-TRACK TORNADO IS ONGOING AND MAY CONTINUE BASED ON   THE ROTATIONAL VELOCITY DURATION AND THE STORM MOVING WITHIN A   FAVORABLE DOWNSTREAM ENVIRONMENT.

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SEVERE WEATHER STATEMENT  
NATIONAL WEATHER SERVICE NORMAN OK  
556 PM CDT WED APR 22 2020  
  
OKC005-013-222330-  
/O.CON.KOUN.TO.W.0020.000000T0000Z-200422T2330Z/  
BRYAN OK-ATOKA OK-  
556 PM CDT WED APR 22 2020  
  
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM CDT FOR  
NORTHEASTERN BRYAN AND SOUTH CENTRAL ATOKA COUNTIES...  
      
AT 555 PM CDT, A CONFIRMED TORNADO WAS LOCATED 5 MILES NORTH OF  
BOKCHITO, MOVING EAST AT 40 MPH.  
  
HAZARD...DAMAGING TORNADO AND GOLF BALL SIZE HAIL.  
  
SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO.  

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