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podcast:ddop:public:episode_201821 [2018/11/22 14:30] (current)
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 +====== Episode 2018-21 - Tornadoes Part 1 ======
 +Hello and welcome to the next edition of the Mike Wills Podcast! This is the Dog Days of Podcasting edition for August 21, 2018 where I am taking you through some of the basics of weather, storms, and radar.
  
 +{Local weather update}
 +
 +===== Notes =====
 +  * Definition: A violently rotating column of air touching the ground, usually attached to the base of a thunderstorm.
 +  * Visual Clues of Tornado Formation
 +    * Large rounded rain-free base which could indicate a mesocyclone
 +    * Increasing spin in wall cloud and cloud base around the wall cloud
 +    * Clearing skies working into the rain-free base, which suggests a hook echo
 +    * Rapid vertical motions rising into wall cloud and a sinking motion around the wall cloud
 +    * Local burst of heavy rain just west of southwest of the wall cloud. This can sometimes be a precursor to a tornado.
 +  * Stages of the tornado
 +    * Developing Stage
 +      * Tornados can develop from either the ground upward or from the middle and low levels downward
 +      * Rear-flank downdraft and precipitation southwest of a call cloud may signal processes that help develop a tornado
 +      * Some circulations start in the low levels near the cloud base with the rapid acceleration of cloud material into an area of tightening rotation.
 +      * The first sign of tornado development may be a dust swirl on the ground. Watch this to see if it's connected to the cloud base.
 +    * Mature Stage
 +      * This is potentially the most dangerous stage of the tornado'​s lifetime
 +      * Funnel is nearly vertical
 +      * A visible funnel may not extend all the way to the ground or may become hidden in the wrapping precipitation
 +      * The rear-flank downdraft will usually wrap around the south and east sides of the wall cloud cutting off the original air flow.
 +      * Rain-free base may take on the horseshoe-shaped appearance. The tornado and wall cloud may be found at the north end of this structure.
 +    * Dissipating Stage
 +      * At this point, the rear-flank downdraft has wrapped around the tornado
 +      * The tornado will start separating from the warn buoyant air that it needs to survive.
 +      * The tornado will shrink, tilt, and take on a snakelike appearance before finally dissipating. This is sometimes known as the rope stage.
 +      * It can still be dangerous at this stage.
 +    * Cyclic Supercells
 +      * There some supercells where the inflow will be refocused a few miles east of the dissipating tornado. ​
 +      * If the environment is favorable, a new mesocyclone and wall cloud will form. This can become a new tornado.
 +      * Always check overhead when you are near the inflow region of the supercell.
 +  * Tornado Strengths
 +    * It is measured by the enhanced fujita scale
 +    * EF 0 = 65-85mph winds
 +    * EF 1 = 86-110mph winds
 +    * EF 2 = 111-135mph winds
 +    * EF 3 = 136-165mph winds
 +    * EF 4 = 166-200mph winds
 +    * EF 5 = 200+mph winds
 +
 +===== Link/​Picture of the Show =====
 +None
 +
 +===== Wrap Up =====
 +Thank you for listening and remember to always watch the clouds and be weather aware.
 +
 +===== Contact Information =====
 +  * Weather-focused Twitter: https://​twitter.com/​mikewillsweathr
 +  * Twitter: https://​twitter.com/​mikewills
 +  * Facebook: https://​www.facebook.com/​mikewills
 +  * Email: <​[email protected]>​
 +  * Website: https://​mikewills.me
podcast/ddop/public/episode_201821.txt · Last modified: 2018/11/22 14:30 (external edit)