South Carolina Severe Weather Awareness Week - Tuesday - Local news, weather, sports Savannah | WSAV On Your Side

South Carolina Severe Weather Awareness Week - Tuesday

South Carolina Severe Weather Awareness Week Continues today 
through Saturday.
Today the discussion is on Tornadoes.
Tornadoes Occur Rarely And Impact Only Very Small Areas As
Compared To Thunderstorms...Tropical Cyclones And Winter Storms.
However...At Their Worst Tornadoes Produce The Most Violent Weather
On Earth.
Most Tornadoes Develop When Warm...Humid Air At The Surface And
Dry...Cold Air Aloft Coincide With Strong Winds Which Change
Direction And Speed With Altitude...Usually Near A Surface Low
Pressure...Warm front Or Cold front. Supercell Thunderstorms
Develop Within These Unique Atmospheric Conditions...And These
Rotating Thunderstorms Produce The Majority Of Tornadoes.
A tornado Forms As An Intense And Concentrated Rotating Column Of
Air Which Extends Between A thunderstorm And The Ground. A Funnel In
Contact A Body Of Water Becomes A waterspout. A Funnel Not In
Contact With The Ground Is Called A funnel cloud. Sometimes The
Lower Portion Of A Funnel Is Not Visible But Is Still In Contact
With The Ground And Is Thus Designated A tornado.
When A Significant Threat For Tornadoes Exists...The National
Weather Service Will Issue A tornado watch Valid For Multiple
Counties...Sometimes Across Multiple States...Valid For Several
Hours. If National Weather Service Doppler radar Or Trained Spotters
Indicate That A tornado Is Occurring Or Imminent...The National
Weather Service Will Issue A tornado warning For The Affected
County...Part Of A County Or Group Of Counties. Tornado Warnings
Typically Last One Half To One Hour. If The Tornado Threat
Persists...The National Weather Service Will Issue Additional
Tornado Warnings.
In Rare Cases...The National Weather Service Will Declare A Tornado
Emergency If Clear Evidence Exists That A Tornado Presents A Grave
Threat To Life And Is Producing Catastrophic Damage.
Tornadoes Occasionally Develop Rapidly When No Watch Or Warning Is
In Effect. You Should Always Take Action To Save Your Life If You
Observe A Tornado.
Here Are Some Other Facts About Tornadoes...
Spring Is The Most Active Season In The Southeastern States...But
Tornadoes Can Occur Any Time Of Year. During The Late Morning Hours
Of Wednesday...January 30 2013...An Ef-3 Tornado Produced One
Fatality...Multiple Injuries And Extensive Damage Across Northwest
Georgia Including Areas Within And Around The Community Of
Adairsville. Tornadoes Are Also Produced By Decaying Tropical
Systems During The Summer And Autumn. In Early September 2004...The
Remnants Of Hurricane Frances Spawned 20 Tornadoes Across Southeast
Georgia And South-Coastal South Carolina.
National Weather Service Teams Survey Storm Damage To Determine If
Damage Was Produced By A Tornado Or By Straight Line Winds.
If The Survey Confirms That A Tornado Occurred...The Team Assigns A
Damage Rating Based On The Enhanced Fujita Scale. This Scale Ranges
From Ef-0...A Weak Tornado With Minor Damage...To Ef-5...A Violent
Tornado With Incredible Damage.
Tornadoes Usually Move From The Southwest To The Northeast At
An Average Forward Speed Of 30 Mph. However...Tornadoes Sometimes
Move As Fast As 70 Mph And Can Move In Any Direction. You Should
Never Attempt To Outrun A Tornado In A Motor Vehicle.
Tornadoes Remain On The Ground For Widely Varying Distances. The
Tri-State Tornado Of March 18 1925 Remained On The Ground For Over
200 Miles From Missouri To Indiana. Conversely...A Tornado Which
Touched Down In Allendale County Sc On February 13 2007 Remained On
The Ground For Only 60 Yards. Sometimes A Single Supercell Will
Produce Multiple Tornadoes...Known As A Tornado Family...Over A
Period Of Hours And Over Many Miles.
Tornadoes In The Southeastern United States Are Frequently Masked By
Heavy Rain And Cannot Be Visually Observed. Tornadoes Also Occur At
Night When They Cannot Be Seen And When Many People Are Asleep.
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