http://bit.ly/1sQIUkE 1. Please describe the records selected by this request. P
ID: 120940 • Letter: H
Question
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1. Please describe the records selected by this request. Please examine the map for any spatial or map patterns relating to winter tornadoes
2. Which part of the country and specific state appears to have the highest frequency of tornadoes during the winter months?
3. Which part of the country and specific state appears to have the highest frequency of tornadoes during the spring months?
4. Which part of the country and specific state appears to have the highest frequency of tornadoes during the summer months?
5.
A. How many records met these criteria
B. What state appears to be at the center of these strong tornadoes?
C. State the exact database criteria all of these records meet in being selected for analysis?
Explanation / Answer
SOLUTION:-1.Tornadoes often occur in the central part of the US because it is an easy area for cold, dry air and warm, moist air to interact with each other. You have the cold, dry air from the north(Canada) meeting with the warm, moist air from the Gulf of Mexico. There are no mountain ranges or anything else to hinder the air flow. Tornadoes are most common in spring and least common in winter. Since autumn and spring are transitional periods (warm to cool and vice versa) there are more chances of cooler air meeting with warmer air, resulting in thunderstorms. Tornadoes can also be caused by landfalling tropical cyclones, which tend to occur in the late summer and autumn. But favorable conditions can occur at any time of the year.The central part of the US is mainly flat plains area. However, tornadoes can and do occur anywhere and at any time if the atmospheric conditions are favorable. These locations are at the 40 degree latitude, or mid latitudes. Warm, moist air sits over the gulf of Mexico and most of the subtropics (30 degree latitudes), while cold polar air is coming from the polar front jet stream in the upper 50 latitudes. This clashing of air causes unstable air which causes turbulence. Turbulence=severe weather.
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