Severe Weather WebQuest



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Name _____________________________________________________ Period _______ Date ______________

Severe Weather WebQuest

First open your web browser and type in the following URL: www.weatherwizkids.com



Hover over the Severe Weather tab at the top of the page and click the appropriate topic.

Then answer the questions. Be sure you write the answers in your own words. You may also abbreviate.

Thunderstorms

  1. What is a thunderstorm?

A thunderstorm is a storm with ______________ and ____________. Its produced by a cumulonimbus cloud, usually producing gusty ___________, heavy ___________ and sometimes __________.

  1. What are the essential ingredients in order for a thunderstorm to occur?

The basic ingredients used to make a thunderstorm are ____________, unstable _______ and lift, moisture to form _________ and __________. You need unstable air that is relatively _________ and can rise rapidly. Finally, you need ___________. This can form from fronts, sea breezes or mountains.

  1. Thunderstorms are most likely to occur in what time of the year?

They are most likely to happen in the ____________ and _____________ months and during the afternoon and evening hours.

  1. There are an estimated ______________________________________ thunderstorms each year.

*** On the LEFT side of the screen click Thunderstorm Definitions***

  1. What is a severe thunderstorm watch?

Damaging winds of _______ miles per hour or more, or 1" __________ in diameter or greater is likely to develop in your area.

  1. What is a severe thunderstorm warning?

Damaging winds of ________ miles per hour or more, or hail __________ of an inch in diameter or greater is taking place in your area.

  1. What is an updraft?

A __________ column of air that rises within a _______. If the air is sufficiently moist, then the moisture condenses to become a cumulus cloud.

***On the LEFT side of the screen, click on the Lightning tab***

  1. What is lightning?

Lightning is a bright flash of ______________ produced by a ___________. All thunderstorms produce lightning and are very dangerous.

  1. What causes lightening to occur?

All of the collisions of small bits of ice (frozen rain drops) create an ____________ charge. After a while, the whole _________ fills up with electrical charges. The positive charges or ____________ form at the _________ of the cloud and the ____________ charges or electrons form at the ____________ of the cloud. Since _________________ attract, that causes a positive charge to build up on the ______________ beneath the cloud. The grounds electrical charge concentrates around anything that _______________, such as mountains, ____________, or single _____________. The charge coming up from these points eventually connects with a charge reaching down from the clouds and - zap - lightning strikes!

  1. What causes thunder to occur?

Thunder is caused by ________________. When a lightning bolt travels from the cloud to the ground it actually opens up a little ________ in the air, called a _____________. Once the light is gone the air ______________ back in and creates a _______________ that we hear as thunder. The reason we see lightning before we hear thunder is because __________ travels faster than ____________!


  1. How can you tell how far away a thunderstorm is?

You can use __________________ to tell how far away a storm is. Next time you see a storm, count the number of _______________ between when you see the _____________ and hear the thunder. Take the number of seconds and divide by _____ and that will tell you how far away the storm is in __________.

***On the LEFT side of the screen click THUNDERSTORM SAFETY***

  1. List 1 indoor safety tips and 1 outdoor safety tips.

OUTDOOR:

INDOOR:

*** At the TOP of the page, hover over the Sever Weather Tab. Then click TORDADOES***

Tornadoes

  1. What is a tornado?

A tornado is a violent ____________ column of air extending from a thunderstorm to the ___________. The most violent tornadoes are capable of tremendous destruction with ____________ speeds of up to _________ mph.

  1. How do tornadoes form?

Most tornadoes form from _________________. You need _________, moist air from the ____________________ and cool, dry air from _____________. When these two air masses meet, they create instability in the ________________. A change in __________ direction and an ____________ in wind speed with increasing height creates an ______________, horizontal ____________ effect in the lower atmosphere. Rising air within the updraft _________ the rotating air from horizontal to _______________. An area of rotation, ________ miles wide, now extends through much of the storm. Most strong and violent tornadoes form within this area of strong rotation.

  1. What is a funnel cloud?

It is a rotating ____________ column of air extending ___________ from the base of a thunderstorm, but _______ touching the ground. When it reaches the ground it is called a tornado.

  1. What is a supercell thunderstorm?

It is a __________ thunderstorm whose updrafts and downdrafts are in near _____________. These storms have the greatest tendency to produce _____________ that stay on the ground for long periods of time. Supercell thunderstorms can produce ___________ tornadoes with winds exceeding __________ mph.

  1. What is a wall cloud?

It is an abrupt lowering of a ______________ cumulonimbus base into a low-hanging accessory __________. A wall cloud is usually situated in the ________________ portion of the storm. A rotating wall cloud usually develops before ______________ or __________ clouds.

  1. What is a water spout?

It is a weak tornado that forms over _________. They are most common along the __________.

  1. When do tornadoes occur?

They can happen at __________ of the year and at any time of the _______. In the southern states, peak tornado season is from _________ through __________. Peak times for tornadoes in the northern states are during the _____________.

***On the LEFT side of the screen, click on Tornado Definitions***

  1. What is a Tornado Watch?

Tornadoes are _____________ in your area. Stay tuned to the ____________ or television news.

  1. What is a Tornado Warning?

A tornado is either on the _________ or has been detected by ___________ radar. Seek shelter _________________!


***On the left side of the screen, click Tornado Safety***

  1. List 3 tornado safety tips (1 before, 1 during, and 1 after a tornado)

Before:
During:
After:
*** At the TOP of the page, hover over the Sever Weather Tab. Then click HURRICANES***

Hurricanes

  1. What is a hurricane?

A hurricane is a huge __________! It can be up to _________ miles across and have strong winds spiraling ___________ and upward at speeds of _____ to 200 mph. Hurricanes gather ___________ and _____________ through contact with ___________ ocean waters. Evaporation from the seawater ___________________ their power.

  1. What is the “eye”?

Hurricanes rotate in a _________________________ direction around an "eye" in the Northern Hemisphere and clockwise direction in the Southern Hemisphere. The ___________ of the storm or "eye" is the _________________ part. It has only ____________ winds and fair weather.

  1. How do hurricanes form?

Hurricanes only form over really ____________ ocean water of ______°F or warmer. The atmosphere (the air) must cool off very ____________ the higher you go. Also, the wind must be blowing in the ____________ direction and at the ___________ speed to force air upward from the ocean surface. Winds flow _____________ above the storm allowing the air below to ____________.The _________________ is needed to create the spin in the hurricane and it becomes too weak near the ____________, so hurricanes can never form there.

  1. When does hurricane season start?

Atlantic hurricane season _________________________________________________ (During the ___________ months

Eastern Pacific season ____________________________________________________



  1. How are hurricanes named?

From 1950 to 1952, tropical cyclones of the North Atlantic Ocean were identified by the ________________________ (Able-Baker-Charlie-etc.), but in 1953 the US Weather Bureau switched to ___________ names. In 1979, it was decided that they should alternate a list that included __________ names too.

***On the left side of the screen, click Hurricane Definitions***

  1. What is a tropical storm watch?

Tropical Storm conditions with sustained winds from ___________ mph are possible in your area within the next _______ hours.

  1. What is a tropical storm warning?

Tropical Storm conditions are ________________ in your area within the next ______ hours.

  1. What is a hurricane watch?

Hurricane conditions with sustained winds of ________ mph or greater are _____________ in your area within the next ________ hours.

  1. What is a hurricane warning?

Hurricane conditions are ______________ in your area within ______ hours.
***On the left side of the screen, click Hurricane Safety***

  1. List 3 hurricane safety tips (1 before, 1 during, and 1 after)

Before:
During:

After:
*** At the TOP of the page, hover over the Sever Weather Tab. Then click WINTER STORMS***



Blizzards

(AKA: Winter Storms)

***On the LEFT side of the screen, click Winter Storm Questions***

  1. How do blizzards form?

A blizzard is a long-lasting ________________ with very strong ___________ and intense snowfall. You need three things to have a blizzard; ______________ at the surface, lots of _____________, and ____________. Warm air must rise over cold air.

***On the left side of the screen, click Wind Chill***

  1. What is a wind chill?

The wind chill is the ___________________ your body feels when the air temperature is combined with the __________________. The higher the wind speed the ______________ exposed areas of your body lose ____________ and the ___________ you feel.

***On the left side of the screen, click Winter Storm Definitions***

  1. What is a winter weather advisory?

Issued for accumulations of ___________, freezing __________, freezing drizzle, and sleet which will cause significant inconveniences and, if caution is not exercised, could lead to ___________________________situations.

  1. What is a winter weather watch?

Alerts the public to the ________________ of a blizzard, _________________, heavy freezing rain, or heavy ______________. Winter Storm Watches are usually issued ____ to _____ hours before the beginning of a winter storm.

  1. What is a winter weather warning?

Issued when ___________________ winter weather in the form of ______________, heavy freezing rain, or heavy ____________ is occurring. Winter Storm Warnings are usually issued _____ to _____ hours before the event is expected.

***On the left side of the screen, click Winter Storm Safety***


  1. List 3 safety tips for blizzards? (1 before, 1 during, and 1 after the storm)

Before:

During:

After:

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