Quiz/Review• Get out a small piece of paper and put your

name on it. • When the bell rings,

the quiz will begin.

Question 1

• Where is the tornado valley?

Question 2

• What time a year do tornadoes strike?

Question 3

• What is the scale used to measure tornadoes?

Answers

1) Mid west United States.2) Spring3) Fujita scale or Enhanced Fujita scale

Winter weather

Blizzards and lake effect snow

What is a blizzard

• A storm that has strong wind and low temperatures.– Winds of 35 mph or more (sustained)– Visibility of less than ¼ mile for at least three

hours.

Where do Blizzards strike?

• Strike anywhere that is subject to snow.• Northern US, Russia, Mountain areas

(usually high latitudes)

When to blizzards hit?

• During cold winter months but usually occur during coldest months like January and February.

What is Lake Effect Snow?

• When winds cross warmer waters and “pick-up” water vapor.

• Wind blows storm clouds over land were it falls as snow.

Fulton, New York after a snowburst dropped 5–6 feet of snow over most of Oswego County between January 28–31, 2004.

In February, 2007, a prolonged lake-effect snow event left 141 inches of snow on the Tug Hill Plateau.

How do lake effect storms occur?

• Fetch (long)– Length of the water the wind flows over.– At least 62 miles

• Warm water (warmer than air)– Difference of 23 degrees F

• Steady wind direction and speed (20mph)• Orographic lifting– Air cools as it rises, cold air cant hold moisture.

Where do lake effect storms hit?

• Near the great lakes is most common in the US.

• Tug Hill gets the most snow in the US (not in the mountains)

Wind Chill• Both Lake Effect and Blizzards have a number

of hazards to be concerned with but the most important is wind chill.