SCIENCE NEWS Thunderstorms What are thunderstorms A storm
- Slides: 33
SCIENCE NEWS
Thunderstorms
What are thunderstorms? A storm which contains lightning and thunder
Why Study Thunderstorms ? n Fatalities n Injuries n Property Damage n Crop Damage
Weather related deaths in the u. s.
Weather damage cost in the U. S.
According to NOAA’s National Weather Service n The US has sustained 90 weather related disasters over the 29 years n Total cost of all 90 events? $700 billion
ILLINOIS According to NOAA, 2008 Summary of Hazardous Weather Fatalities, Injuries, and Damage Costs by State n Fatalities 35 n Injuries 48 n Property Damage $ 227. 14 million n Crop Damage $ 41. 04 million n Total - $ 268. 18 million
Average number of days per year with thunderstorms
FACTS FEATURES n Cumulonimbus clouds n Heavy rainfall n Lightning n Occasional hail OCCURANCES n 2000 in progress at any one time n 100, 000 per year in the United States n Most frequent in Florida and eastern Gulf Coast region
All thunderstorms need Moisture - source typically over water, cloud formation & rain Lifting- mechanism for condensing moisture to release its latent heat Unstable air- rising air warmer than the surrounding air, produce upward growing clouds and vertical updrafts keep precipitation suspended
2 Types of Thunderstorms Classified by lifting mechanism 1. Air mass - unequal heating of surface Mountain : Orographic lifting Sea breeze : difference between land/water storage & release of thermal energy 2. Frontal – advancing cold fronts and more rarely warm front
Stages of development 3 distinct stages make up a t-storm
Cumulus stage Warm, humid air rises vertically and condenses into a cumulus cloud n Large amounts of latent heat are release inside the cloud n As the cloud grows, particles eventually get heavy enough to fall also sides of the cloud evaporates forming a downdraft n No precipitation during this stage n
Cumulus Stage
Mature stage n The appearance of a downdraft n Updraft/downdraft is called a “cell” n An “anvil” top appears as the updrafts hit the tropopause n Heavy rain possible in this stage n Strong/gusty surface winds
Mature Stage
Dissipation n Downdrafts updrafts n basically choke out the Cuts off the warm, moist air which is the energy supply for the storm n Light rain only
Dissipating Stage
Multi cell thunderstorms n If new thunderstorms forms due to downdrafts from the air mass, they are called “multi cell” thunderstorms n Most severe storms & ordinary storms are multi cell storms
Multi cell Thunderstorm
Thunderstorm hazards Hail n n n Collision of super cool water drops forms layers Cause extensive & quick damage Largest Aurora, Nebraska 6/03 7 in diameter & 18. 75 in circumference almost a soccer ball
Lightning & Thunder Charge differences between the thunderstorm and ground can cause lightning strokes of 30, 000°C, and this rapid heating of air will creates an explosive shock wave called thunder, which requires approximately 3 seconds to travel 1 kilometer
Lightning Stroke Development Charge layers in the cloud are formed by the transfer of positive ions from warmer hailstones to colder ice crystals. When the negative charge near the bottom of the cloud is large enough to overcome the air's resistance, a stepped leader forms. A region of positive ions move from the ground toward this charge, which then forms a return stroke into the cloud.
Lighting • • Several names, such as forked, bead, ball, and sheet lightning describe forms of the flash Distant, unseen lightning is often called heat lightning
2007 Lightning Fatalities n 45 lightning fatalities n Above the 10 -year average of 44 fatalities. n For the 9 th consecutive year, Florida was hardest hit with 11 fatalities n Illinois 1 fatality
ANY QUESTIONS?
HOMEWORK n QUIZ? n Read n Ch 13 p 344 - 349 13 Study Guide Due Tues 4/28 Ch 12 test corrections due TR 4/30
Good References http: //www. eoearth. org/article/Thunderstorm n USE THIS FOR SEVERVE TSTROMS http: //images. google. com/imgres? imgurl=http: //www. sr h. noaa. gov/jetstream//tstorms/images/tstrm_climo. jp g&imgrefurl=http: //www. srh. noaa. gov/jetstream//tsto rms/tstorms_intro. htm&usg=__m 1 V 4 Sh 8 B 9 WBA 8 zbb. PFf. GZa. Pn. M 0=&h=577&w=641&sz =126&hl=en&start=3&um=1&tbnid=q. QOw 5 qoo 0 z. Zh. M: &tbnh=123&tbnw=137&prev=/images%3 Fq%3 Dav erage%2 Bnumber%2 Bof%2 Bdays%2 Bwith%2 Bthund erstorms%2 Bin%2 Bthe%2 Busa%26 hl%3 Den%26 sa% 3 DN%26 um%3 D 1
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