41. Business Toolkit : Hazards And Threats : Natural Hazards : Thunderstorms thunderstorms can be disruptive to businesses, and business owners must thunderstorms can occur any time of day year round, but are most common in the http://www.vdem.state.va.us/business/hazthreats/natural/thunderstorms/index.cfm

Skip to Content Online Services Commonwealth Sites Help ... Governor Search Virginia.gov: VDEM Home VA Business Toolkit Natural Hazards TOOLKIT HOME ... RESOURCES How can we make this site better? Let us know ... Hazards and Threats: Natural Hazards Natural Hazards Home Hurricanes Tornadoes Floods ... Wildfires Thunderstorms Geologic Events Thunderstorms Thunderstorms can be disruptive to businesses, and business owners must prepare well in advance for the wide variety of dangerous conditions that thunderstorms can bring. What other types of severe storms occur in Virginia? What areas in Virginia are most vulnerable? What are the likely impacts of these types of storms? Warnings and advisories What other types of severe storms occur in Virginia? Thunderstorms Thunderstorms can occur any time of day year round, but are most common in the summer afternoons and evenings. The National Weather Service considers a thunderstorm severe if it produces hail at least three-quarters of an inch in diameter, has winds of 58 miles per hour or higher or produces a tornado. All thunderstorms produce lightning, which can be deadly. Virginia averages 35 to 45 thunderstorm days per year. The National Weather Service issues watches and warning for severe thunderstorms. A

42. Thunderstorms (The Best Thing To Listen To) A good thing to fall asleep to as long as it’s not TOO loud . then I get worried hehe ) http://bestuff.com/stuff/thunderstorms

43. Thunderstorms &Tornadoes When a storm contains thunder and lightning, it is considered to be a thunderstorm. Mouse over the different regions of the continental United States on the http://eo.ucar.edu/webweather/thunder.html

Do you know the basic ingredients for weather? Check here! When a storm contains thunder and lightning, it is considered to be a thunderstorm. Mouse over the different regions of the continental United States on the map below to see the average number of thunderstorm days per year. What state has the highest number of thunderstorm days per year per 10,000 square miles? Guess which state has the most lightning strikes per year per 10,000 square miles Check true or false: The state is surrounded by water True False Winds blow from the ocean over land. True False The ocean surrounding the state provides lot of moisture True False The land is surrounded by desert. True False Air flows come together over the peninsula. True False There is moist air rising over Florida's warm land surface. True False Read all about it! A Close Encounter With Lightning A Wild Ride During a Flash Flood Click here to find out! Return to the Thunderstorms Home Page ... [Predict the weather!]

44. Thunderstorms - VeterinaryPartner.com - A VIN Company! Fear of thunderstorms is common in dogs, and tends to get worse as they age. It is partly genetic. While some aspects of this problem remain a mystery, http://www.veterinarypartner.com/Content.plx?P=A&A=1654

45. Thunderstorm - MSN Encarta Thunderstorm, rain cloud or clouds that produce thunder and lightning. thunderstorms are very tall clouds that extend from near the ground up to, and http://encarta.msn.com/encyclopedia_761588006/Thunderstorm.html

var s_account="msnportalencarta"; MSN home Mail My MSN Sign in ... more Hotmail Messenger My MSN MSN Directory Air Tickets/Travel Autos City Guides Election 2008 ... More Additional Reference Materials Thesaurus Translations Multimedia Other Resources Education Resources Math Help Foreign Language Help Project Planner ... Help Related Items Lightning A Guide to Storms more... Encarta Search Search Encarta about Thunderstorm Also on Encarta Secret students What colleges really want Famous misquotes quiz Advertisement Thunderstorm Encyclopedia Article Find Print E-mail Blog It Multimedia 4 items Article Outline Introduction Formation of Thunderstorms Formation of Lightning Formation of Hail I Introduction Print this section Thunderstorm , rain cloud or clouds that produce thunder and lightning . Thunderstorms are very tall clouds that extend from near the ground up to, and often slightly above, the top of the troposphere , the bottom layer of the atmosphere. A thunderstorm has a characteristic cylindrical or slight hour-glass shape with a puffy, cauliflower texture. Clouds with this texture are called cumulus, and clouds that produce rain are called nimbus. Because thunderstorms are a combination of these two, they are called cumulonimbus clouds. Many thunderstorms develop an anvil-shaped top as the top is sheared by high-altitude wind. Severe thunderstorms can produce hail , strong winds, and tornadoes . Weak thunderstorms are called thundershowers. Some thundershowers are so weak that they produce virga , which is rain falling from the cloud that evaporates before reaching the ground.

46. THUNDERSTORM WARNING thunderstorms commonly occur in spring and summer months in Hong Kong. On average, thunderstorms are reported at the Hong Kong Observatory in 5 days per http://www.weather.gov.hk/wservice/warning/thunder.htm

Home What's new Access to information Public services ... Back Thunderstorm Warning Thunderstorms Thunderstorms commonly occur in spring and summer months in Hong Kong. On average, thunderstorms are reported at the Hong Kong Observatory in 5 days per month during April to September. Most thunderstorms form in cumulonimbus cloud. A cumulonimbus cloud typically covers an area of a few kilometres in diameter with a vertical extent of ten kilometres or more, like a tower hanging in the sky. The typical life span of a cumulonimbus cloud is a couple of hours. In the vicinity of active weather systems such as low pressure troughs, cumulonimbus clouds may form one after another. Such thunderstorms are more widespread and persistent. Occasionally, cumulonimbus clouds merge to form severe thunderstorms called supercells. On a summer day that sets off with fine weather, insolation may trigger the growth of cumulonimbus clouds and the formation of thunderstorms. Such thunderstorms are often localized and short lived. The weather may even be sunny not far away from the storms. Sometimes, the cumulonimbus clouds will drift with the wind and affect other areas. The areas of formation of the clouds may also vary with time. Thunderstorms are characterized by flashes of lightning and claps of thunder. In an unstable and moist atmosphere, water droplets and ice pellets in the cloud will become electrically charged in convective motion. When the electric field arising from the piling up of charges reaches a certain breakdown value, lightning discharges take place between clouds or between cloud and the earth's surface. The explosive expansion of the surrounding air produces the rolling sound of thunder. As a rule of thumb, if the sound of thunder reaches an observer three seconds after a lightning flash, the thunderstorm is about one kilometre away from the observer. The distance of thunderstorms for different time delay of the thunder sound can be estimated similarly.

47. 7(t) Thunderstorms And Tornadoes Contains how thunderstorms are formed, with pictures of hail, lightning, and thunderclouds. http://www.physicalgeography.net/fundamentals/7t.html

FUNDAMENTALS OF PHYSICAL GEOGRAPHY HOME FUNDAMENTALS ONLINE TEXTBOOK GLOSSARY ... ABOUT CHAPTER 7: Introduction to the Atmosphere (t). Thunderstorms and Tornadoes Thunderstorms Thunderstorms form when moist, unstable air is lifted vertically into the atmosphere. Lifting of this air results in condensation and the release of latent heat . The process to initiate vertical lifting can be caused by: (1). Unequal warming of the surface of the Earth. Orographic lifting due to topographic obstruction of air flow. (3). Dynamic lifting because of the presence of a frontal zone Immediately after lifting begins, the rising parcel of warm moist air begins to cool because of adiabatic expansion. At a certain elevation the dew point is reached resulting in condensation and the formation of a cumulus cloud. For the cumulus cloud to form into a thunderstorm, continued uplift must occur in an unstable atmosphere. With the vertical extension of the air parcel, the cumulus cloud grows into a cumulonimbus cloud.

48. Thunderstorm - How Thunderstorms Form The most common violent change in the weather is the thunderstorm. In the United States, thunderstorms usually occur in the late spring and summer. http://www.scienceclarified.com/Sp-Th/Thunderstorm.html

// nothing @import "../css/default.css"; Science of Everyday Things Science in Dispute Science and Technology Thunderstorm forum ... Sp-Th Thunderstorm The most common violent change in the weather is the thunderstorm. In the United States, thunderstorms usually occur in the late spring and summer. Thunderstorms are rare in the parts of the country where the air tends to be colder, such as the New England states, North Dakota, and Montana. They also are rare by the Pacific Ocean, where summers are dry. The southeastern states tend to have the most thunderstorms. Some parts of Florida experience thunderstorms on a average of 100 days a year. A thunderstorm may last up to two hours, but most thunderstorms peak after about 15 to 30 minutes. How thunderstorms form Thunderstorms develop by the same process that forms cumulus clouds, the puffy clouds of summer skies. These clouds form when a humid air mass (air with an abundance of water vapor) near the surface rises on currents of air called updrafts. As the air mass rises through the atmosphere it expands and cools. Eventually, the rising air cools to the point where its water vapor condenses to form droplets of liquid water, releasing heat in the process into the surrounding air. This latent heat, in turn, causes the air mass to rise ever more quickly. The upward movement of air in a storm cloud has been measured at more than 50 miles (80 kilometers) per hour. As the upward movement of air continues, more moisture condenses out of the air mass and the suspended droplets form a large cloud. Depending on atmospheric conditions, a storm cloud of this type may rise to a height of anywhere from 6 to 9 miles (10 to 15 kilometers). In the clouds of colder climates, droplets may freeze to form ice crystals, which grow as more and more water vapor condenses on them. The droplets or ice crystals only grow as long as they can be supported by the updrafts. When they grow too large they begin to fall out of the cloud as drizzle or raindrops.

49. Thunderstorms - Thunderstorms Around The World And In The United States, How Thu Meteorologists estimate that, at any given moment, some 1800 thunderstorms are in progress over Earth s surface, and about 18 million a year around the http://www.weatherexplained.com/Vol-1/Thunderstorms.html

// nothing @import "../css/default.css"; Thunderstorms forum Weather Explained Vol 1 Thunderstorms Thunderstorms around the World and in the United States HOW THUNDERSTORMS DEVELOP The orderly circulations produced in a laboratory are rarely encountered in the atmosphere, where areas corresponding to the rising core of laboratory convective cells are marked by cumulus and cumulonimbus clouds. Clouds are parcels of air that have been lifted high enough to condense the water vapor they contain into very small, visible particles. These particles are too small and light to fall out as rain. As the lifting process continues, these particles grow in size by collision and coalescence until they are large enough to fall against the updrafts associated with any developing convective clouds. Cumulus (for accumulation) clouds begin their towering movement in response to atmospheric instability and convective overturning. Warmer and lighter than the surrounding air, they rise rapidly around a strong, central updraft. These elements grow vertically, appearing as rising mounds, domes, or towers. The atmospheric instability in which thunderstorms begin may develop in several ways. Radiational cooling of cloud tops, heating of the cloud base from the ground, and frontal effects may produce an unstable condition. This is compensated in air, as in most fluids, by the convective overturning of layers to put denser layers below less-dense layers.

50. Thunderstorms And Lightnings A thunderstorm is formed from a combination of moisture, rapidly rising warm air and a force capable of lifting air such as a warm and cold front, http://www.nsa.naples.navy.mil/disasterprep/thunderstorms.html

What is a Thunderstorm? What is Lightning? Precautions to Be Taken What to Do During a Thunderstorm ... What to Do When Lightning Strikes a Person What is a Thunderstorm? A thunderstorm is formed from a combination of moisture, rapidly rising warm air and a force capable of lifting air such as a warm and cold front, a sea breeze or a mountain. All thunderstorms contain lightning. Thunderstorms may occur singly, in clusters or in lines. Thus, it is possible for several thunderstorms to affect one location in the course of a few hours. Some of the most severe weather occurs when a single thunderstorm affects one location for an extended time. Some thunderstorms can be seen approaching, while others hit without warning. It is important to learn and recognize the danger signs and to plan ahead. Learn the thunderstorm danger signs. Dark, towering, or threatening clouds. Distant lightning and thunder. Because light travels much faster than sound, lightning flashes can be seen long before the resulting thunder is heard. Estimate the number of miles you are from a thunderstorm by counting the number of seconds between a flash of lightning and the next clap of thunder. Divide this number by five.

51. AMS Glossary A thunderstorm is a consequence of atmospheric instability and constitutes, thunderstorms often build to altitudes of 40 000–50 000 ft in midlatitudes http://amsglossary.allenpress.com/glossary/search?id=thunderstorm1

52. Thunderstorms & Lightning Although thunderstorms in this area are less likely to spawn tornadoes than elsewhere in the United States, most wind damage is from straightline rather http://www.bcoem.org/thunder.htm

Other Emergency Preparedness Information Disaster Psychology Home Disaster Kit Power Outages Animal Emergency ... (Download an Adobe PDF of this infomation - Click Here) Thunderstorms can bring heavy rains, flash flooding, tornadoes, strong winds, lightning, and hail Flash floods/floods are the number one killer associated with thunderstorms with nearly 140 fatalities a year Although thunderstorms in this area are less likely to spawn tornadoes than elsewhere in the United States, most wind damage is from "straight-line" rather than tornadic winds. "Downbursts", a type of straight-line wind, can cause damage equivalent to a strong tornado. Lightning occurs with all thunderstorms. Its electrical charge and intense heat can electrocute on contact, cause electrical failures, split trees, and ignite structure and brush fires. Hail associated with thunderstorms can be smaller than peas or as large as softballs and can be very destructive. While some thunderstorms can be seen approaching, others hit without warning.

53. Inside Britannica thunderstorms arise when layers of warm, moist air rise in a large, On occasion, severe thunderstorms are accompanied by swirling vortices of air that http://newsletters.britannica.com/august_articles/thunderstorm.htm

Home My Account Shopping Help ... Forward to a Friend thunderstorm a violent, short-lived weather disturbance that is almost always associated with lightning, thunder, dense clouds, heavy rain or hail, and strong, gusty winds. Thunderstorms arise when layers of warm, moist air rise in a large, swift updraft to cooler regions of the atmosphere. There the moisture contained in the updraft condenses to form towering cumulonimbus clouds and, eventually, precipitation. Columns of cooled air then sink earthward, striking the ground with strong downdrafts and horizontal winds. At the same time, electrical charges accumulate on cloud particles (water droplets and ice). Lightning discharges occur when the accumulated electric charge becomes sufficiently large. Lightning heats the air it passes through so intensely and quickly that shock waves are produced; these shock waves are heard as claps and rolls of thunder. On occasion, severe thunderstorms are accompanied by swirling vortices of air that become concentrated and powerful enough to form tornadoes. This article covers two major aspects of thunderstorms: their meteorology (i.e., their formation, structure, and distribution) and their electrification (i.e., the generation of lightning and thunder). For separate coverage of related phenomena not covered in this article, see tornado, ball lightning, bead lightning, and red sprites and blue jets.

54. Thunderstorms Provider of quality survival kits, survival and hurricane supplies for severe weather. For winter storm emergencies, get your disaster preparedness supplies http://www.getreadygear.com/index.asp?ID=36&PageAction=Custom

55. Ten Spider Tech - Thunderstorms A thunderstorm is capable of producing a variety of intense and severe weather, including heavy rain, lightning, high straightline winds, http://www.tenspider.net/weather/severe-weather-thunderstorm.html

56. Thunderstorms thunderstorms affect relatively small areas when compared to hurricanes and winter storms which sweep large areas. A typical thunderstorm is about 15 miles http://www.karinya.com/thundr.htm

THUNDERSTORMS and FLOODS! (Print and keep this for reference) Thunderstorms affect relatively small areas when compared to hurricanes and winter storms which sweep large areas. A typical thunderstorm is about 15 miles in diameter and lasts for an average of 30 minutes, though since about 1980, storms in general have been of greater severity and have lasted longer; however, no statistics have been collected to bear this out. Nearly 1,800 thunderstorms are occurring at any moment around the world. That's 16 million each year! Despite their small size, all thunderstorms are dangerous. Every thunderstorm produces lightning which kills more people each year than tornados. Heavy rain from thunderstorms can lead to flash floods - another hazard which often wrecks havoc in inhabitated areas. Strong winds, hail and tornados are also dangers associated with some thunderstorms. Of the estimated 100,000 thunderstorms that occur each year in the U.S., only about 10 percent are classified as severe. The U.S. National Weather Service considers a thunderstorm severe if it produces hail at least 3/4 inch in diameter with winds 58 MPH or higher or a tornado. 10 to 20 feet.

57. Thunderstorm@Everything2.com thunderstorms are one of the most common and most noticeable weather products of our atmosphere. They form worldwide, spit out deadly lightning, http://www.everything2.com/index.pl?node=thunderstorm

58. Thunderstorm Index thunderstorms can bring heavy rains (which can cause flash flooding), strong winds, hail, lightning and tornadoes. In a severe thunderstorm get inside a http://www.loep.state.la.us/hlshazards/thunderstormlindex.htm

About GOHSEP Homeland Security Citizen Corps Recovery ... Gateway Governor's Office of 7667 Independence Blvd. Baton Rouge, LA 70806 Thunderstorm Index Emergency Information Thunderstorms can bring heavy rains (which can cause flash flooding), strong winds, hail, lightning and tornadoes. In a severe thunderstorm get inside a sturdy building and stay tuned to a battery-operated radio for weather information. Severe thunderstorms can strike at any time of the day or night. The heaviest volume of severe thunderstorms occurs from April through September. Lightning is a major threat during a thunderstorm. In the United States, between 75 to 100 Americans are hit and killed each year by lightning. If you are caught outdoors, avoid natural lightning rods such as tall, isolated trees in an open area or the top of a hill and metal objects such as wire fences, golf clubs and metal tools. If you are swimming, get out of the water and seek shelter. If boating, return to shore. Inside your home; keep away from windows and doors, avoid use the telephone unless there's an emergency and don't use electrical appliances. If you see wires on the ground, DON'T GO NEAR THEM!

59. Thunderstorms - Definition Of Thunderstorms By The Free Online Dictionary, Thesa Definition of thunderstorms in the Online Dictionary. Meaning of thunderstorms. What does thunderstorms mean? thunderstorms synonyms, thunderstorms antonyms http://www.thefreedictionary.com/Thunderstorms

Domain='thefreedictionary.com' word='thunderstorm' Printer Friendly 759,498,405 visitors served. TheFreeDictionary Google Word / Article Starts with Ends with Text subscription: Dictionary/ thesaurus Medical dictionary Legal dictionary Financial dictionary Acronyms Idioms Encyclopedia Wikipedia encyclopedia Hutchinson ... encyclopedia thunderstorm (redirected from Thunderstorms Also found in: Medical Acronyms Encyclopedia Wikipedia ... Hutchinson 0.01 sec. write_ads(AdsNum, 0) thun·der·storm (th n d r-stôrm n. A transient, sometimes violent storm of thunder and lightning, often accompanied by rain and sometimes hail. thunderstorm (th n d r-stôrm A storm of heavy rain accompanied by lightning, thunder, wind, and sometimes hail. Thunderstorms occur when moist air near the ground becomes heated, especially in the summer, and rises, forming cumulonimbus clouds that produce precipitation. Electrical charges accumulate at the bases of the clouds until lightning is discharged. Air in the path of the lightning expands as a result of being heated, causing thunder. Thunderstorms can also be caused by temperature changes triggered by volcanic eruptions and forest fires, and they occur with much greater frequency at the equatorial regions than in polar regions. Thesaurus Legend: Synonyms Related Words Antonyms Noun thunderstorm - a storm resulting from strong rising air currents; heavy rain or hail along with thunder and lightning

60. Thunderstorms thunderstorms are very common and affect great numbers of people each year. Despite their small size in comparison to hurricanes and winter storms, http://www.village.sussex.wi.us/thunderstorms.htm

Thunderstorms T hunderstorms are very common and affect great numbers of people each year. Despite their small size in comparison to hurricanes and winter storms, all thunderstorms are dangerous. Every thunderstorm produces lightning. Other associated dangers of thunderstorms include tornadoes, strong winds, hail, and flash flooding. Flash flooding is responsible for more fatalities— more than 140 annually— than any other thunderstorm-associated hazard. Some thunderstorms do not produce rain that reaches the ground. These are generically referred to as dry thunderstorms and are most prevalent in the western United States. Known to spawn wildfires, these storms occur when there is a large layer of dry air between the base of the cloud and the ground. The falling raindrops evaporate, but lightning can still reach the ground. What to do before thunderstorms approach 1. Know the terms used by weather forecasters: Severe Thunderstorm Watch — Tells you when and where severe thunderstorms are likely to occur. Watch the sky and stay tuned to radio or television to know when warnings are issued. Severe Thunderstorm Warning — Issued when severe weather has been reported by spotters or indicated by radar. Warnings indicate imminent danger to life and property to those in the path of the storm.

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