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General severe weather information
Exactly what constitutes a severe thunderstorm?
A thunderstorm is considered severe when any or all of the following occur:
- hail 3/4" in diameter or larger
- winds in excess of 50 knots (58 mph)
- the occurence of a tornado or funnel cloud
Severe thunderstorm dangers
Severe thunderstorms can produce deadly:
- downburst winds
- large hailstones
- lightning
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What is the difference between a watch and a warning?
- Severe Storm Watch
- A severe thunderstorm watch tells you when and where severe thunderstorms are most likely to
occur.
- Severe Storm Warning
- A severe thunderstorm warning is issued when severe weather has been reported or is
imminent.
- Tornado Watch
- A tornado watch means that tornadoes are possible in the area. Remain alert for
approaching storms.
- Tornado Warning
- A tornado warning means that tornadoes have been spotted in the area or indicated by
weather radar.
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- Flash Flood or Flood Watch
- Flash flooding or flooding is possible in the designated watch area - be alert.
- Flash Flood or Flood Warning
- Flash flooding or flooding has been reported or is imminent - take necessary
precautions at once.
- Urban and Small Stream Flood Advisory
- Flooding of small streams, streets, and low-lying areas, such as railroad underpasses
and urban storm drains, is occurring.
- Flash Flood or Flood Statement
- Follow-up information regarding a flash flood/flood event.
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Detailed Severe Weather Information
Weather Safety Guide
Spotters Guide for Identifying and Reporting Severe Local Storms
Pictorial Spotters Guide to Severe Storms
Flash Floods and Floods - The Awesome Power
Thunderstorms and Lightning - The Underrated Killers
Tornadoes - Natures Most Violent Storms
Lightning Information
Information on the EMWIN System
Disaster and Emergency Services
from the American Red Cross:
Disaster and Emergency Services Overview
from the Federal Emergency Management Agency - FEMA:
Preparing for a Disaster
In no way do the links contained on these pages constitute an endorsement
by the National Weather Service of those sites or vendors. The National
Weather Service is not responsible for the timeliness or availability of
products over the internet.
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