Limited time offer 20% OFF StudySoup Subscription details

UGA - GEOG 1111 - Class Notes - Week 15

Created by: Bridget Notetaker Elite Notetaker

> > > > UGA - GEOG 1111 - Class Notes - Week 15

UGA - GEOG 1111 - Class Notes - Week 15

This preview shows pages 1 - 2 of a 4 page document. to view the rest of the content
background image Geography 1111 Lecture 15 Notes Thunderstorms: thunderstorm (T-storm) is a cumulus cloud 
which has developed sufficiently to produce precipitation and thus 
be classified as a cumulonimbus (Cn) cloud
o It also is producing the characteristic events of lightning and  thunder o Severe T-storms are accompanied by strong winds and wind  gusts, heavy rain, and sometimes hail and tornadoes o They are an indication of great instability in the atmosphere  and show a great deal of vertical development Requirements for Formation: o Warm, moist air: releases Latent Energy when lifted and  condensation occurs This provides buoyancy and maintains lift to develop 
o High surface temperatures: enhances instability, air parcel warming and uplift These two conditions help establish and/or strengthen  atmospheric instability which will strengthen the T-storm Stages of Formation: o Cumulus stage: the initial build-up of cumulus clouds fueled  by updrafts (up to 160 kph) of warm, moist air cooling 
Droplet formation is by the Bergeron and Collision-
Coalescence processes
Updrafts dominate during this stage o Mature stage: raindrops start to fall initiating downdrafts The process of entrainment (the influx of cool, dry 
surrounding air) helps to fuel the downdrafts
Heavy rains, lightning and thunder are most intense 
during this stage
It is also during this stage that hail or a tornado may 
Mixture of updrafts and downdrafts during this 
o Dissipating stage: occurs as the rate and amount of rain  lessens with the loss of warm, moist air and latent heat 
The storm breaks up and the cloud mass evaporates On average they are of relatively short duration, 1 - 3 
hours, but may last for up to 12 hours or more
Downdrafts dominate during this stage
background image Locations of Occurrence:  Thunderstorms occur in many parts of the world
They are a daily occurrence along the ITCZ
In the U.S. they form primarily east of the Rocky Mts. with 
Florida being the state with the greatest number of days per 
year with thunderstorm occurrence
The Great Plains is the region with the greatest number per  year  Lightning: flashes of light generated by the flow of tens of millions 
of volts of electrons (electrical charge) between oppositely charged 
parts of a cloud or between the cloud and the ground
What causes lightning? Charges are separated within the cloud as the 
thunderstorm develops with positive charges 
primarily near the top and negative charges at 
the base
Lightning is essentially the clouds way of trying 
to equalize this charge difference or imbalance
After a charge difference builds to millions or hundreds 
of millions, a lightning strike occurs to discharge the 
negative base of the cloud by moving positive charges 
to the base and negative charges to the top
This is accomplished either by: within cloud lightning,
Cloud-to-cloud lightning, 
or Cloud-to-ground 
o The Lightning Strike: basic Cloud-to-ground lightning The first step is the establishment of an invisible step 
 of charges formed from the cloud base toward 
the ground
This may contain several linked pathways, each  reaching toward the ground Once one of these pathways reaches the ground, the 
connection between the areas of unlike charges is 
The pathway which reaches the ground first is the  main trunk of the lightning strike and is the most 
brightly illuminated
The movement of opposite charges back 
cloud ward is the return stroke and what 
causes the illumination of the pathways, the
flash of lightning
This also illuminates all connected pathways

This is the end of the preview. Please to view the rest of the content
Join more than 18,000+ college students at University of Georgia who use StudySoup to get ahead
School: University of Georgia
Department: Geography
Course: Intro to Physical Geography
Professor: Hopkins
Term: Fall 2016
Name: Geography 1111 Lecture 15 Notes
Description: This is a filled in copy of the lecture 15 notes we took in Professor Hopkins' class on Monday (9/19).
Uploaded: 09/19/2016
4 Pages 12 Views 9 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
Join StudySoup for FREE
Get Full Access to UGA - GEOG 1111 - Class Notes - Week 15
Join with Email
Already have an account? Login here
Log in to StudySoup
Get Full Access to UGA - GEOG 1111 - Class Notes - Week 15

Forgot password? Reset password here

Reset your password

I don't want to reset my password

Need help? Contact support

Need an Account? Is not associated with an account
Sign up
We're here to help

Having trouble accessing your account? Let us help you, contact support at +1(510) 944-1054 or

Got it, thanks!
Password Reset Request Sent An email has been sent to the email address associated to your account. Follow the link in the email to reset your password. If you're having trouble finding our email please check your spam folder
Got it, thanks!
Already have an Account? Is already in use
Log in
Incorrect Password The password used to log in with this account is incorrect
Try Again

Forgot password? Reset it here