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Iowa, Harrison

Public Information Statement

Statement as of 6:08 AM CDT on March 28, 2017

Expires 7:00 PM EDT on March 28, 2017


... 2017 severe weather awareness week for Nebraska and Iowa...

The National Weather Service along with Nebraska emergency management
and the Iowa Homeland security and emergency division have declared
March 27 through March 31 as severe weather awareness week.

The topic for today is thunderstorms.

A thunderstorm is considered severe when it produces hail that is one inch
in diameter or larger, damaging winds equal to or greater than 58 miles
per hour, or a tornado.

There are numerous aspects of severe thunderstorms that pose a threat to
life and property. Along with the threat of large hail, damaging winds,
and tornadoes, everyone must also be aware of the possibility of dangerous
lightning and flooding. Lightning, flooding, and tornadoes will be
discussed later during the week.

Hail is produced in a thunderstorm as rising currents of air, known as
updrafts, carry water droplets to a height where freezing occurs. Hail
continues to grow inside of a thunderstorm until it becomes too heavy and
can no longer be supported by the storm updraft. Once this occurs, the
hailstone falls to the ground. Large hail is an indication that a
thunderstorm is quite intense with a very strong updraft. The largest
hailstone ever recorded in the United States fell in Vivian, South
Dakota, with a diameter of 7.9 inches and circumference of over
18 inches, and weighing 1.94 pounds.

Another significant severe weather threat is damaging winds, which can
be caused by an event known as a downburst. A downburst is a small area
of rapidly descending air beneath a thunderstorm. Once this descending
air hits the ground, it spreads out in all directions. Downbursts and the
resulting straight line winds can cause damage comparable to a tornado.

Anytime the threat for severe weather exists, stay updated on the latest
weather information by going to the National Weather Service website,
http://www.Weather.Gov, or by tuning in to NOAA Weather Radio all hazards,
or your local television and radio station. Make sure to watch for signs
for approaching storms, such as darkening skies, increasing winds, flashes
of lightning, and thunder.

For safety information visit www.Weather.Gov/os/severeweather.

For more information contact:

Brian Smith
warning coordination meteorologist
National Weather Service Omaha/valley NE
www.Weather.Gov/Omaha
402-359-5166

Cathy zapotocny
meteorologist
National Weather Service Omaha/valley NE
www.Weather.Gov/Omaha
402-359-5166




608 am CDT Tue Mar 28 2017

... 2017 severe weather awareness week for Nebraska and Iowa...

The National Weather Service along with Nebraska emergency management
and the Iowa Homeland security and emergency division have declared
March 27 through March 31 as severe weather awareness week.

The topic for today is thunderstorms.

A thunderstorm is considered severe when it produces hail that is one inch
in diameter or larger, damaging winds equal to or greater than 58 miles
per hour, or a tornado.

There are numerous aspects of severe thunderstorms that pose a threat to
life and property. Along with the threat of large hail, damaging winds,
and tornadoes, everyone must also be aware of the possibility of dangerous
lightning and flooding. Lightning, flooding, and tornadoes will be
discussed later during the week.

Hail is produced in a thunderstorm as rising currents of air, known as
updrafts, carry water droplets to a height where freezing occurs. Hail
continues to grow inside of a thunderstorm until it becomes too heavy and
can no longer be supported by the storm updraft. Once this occurs, the
hailstone falls to the ground. Large hail is an indication that a
thunderstorm is quite intense with a very strong updraft. The largest
hailstone ever recorded in the United States fell in Vivian, South
Dakota, with a diameter of 7.9 inches and circumference of over
18 inches, and weighing 1.94 pounds.

Another significant severe weather threat is damaging winds, which can
be caused by an event known as a downburst. A downburst is a small area
of rapidly descending air beneath a thunderstorm. Once this descending
air hits the ground, it spreads out in all directions. Downbursts and the
resulting straight line winds can cause damage comparable to a tornado.

Anytime the threat for severe weather exists, stay updated on the latest
weather information by going to the National Weather Service website,
http://www.Weather.Gov, or by tuning in to NOAA Weather Radio all hazards,
or your local television and radio station. Make sure to watch for signs
for approaching storms, such as darkening skies, increasing winds, flashes
of lightning, and thunder.

For safety information visit www.Weather.Gov/os/severeweather.

For more information contact:

Brian Smith
warning coordination meteorologist
National Weather Service Omaha/valley NE
www.Weather.Gov/Omaha
402-359-5166

Cathy zapotocny
meteorologist
National Weather Service Omaha/valley NE
www.Weather.Gov/Omaha
402-359-5166



Weather Severe Map
Alaska - Winter Weather Advisory
Arizona - Wind Advisory , High Wind Watch , High Wind Watch, Wind Advisory , Fire Weather Warning , Public Information Statement
Arkansas - Flood Warning
California - High Surf Advisory , Wind Advisory , High Wind Warning, Wind Advisory , High Wind Watch, Wind Advisory , High Wind Watch , High Wind Warning , Frost Advisory , Fire Weather Warning , Beach Hazard Statement , Hydrologic Statement , Public Information Statement
Colorado - Winter Storm Warning , Winter Weather Advisory , Special Statement
Connecticut -
District of Columbia - Public Information Statement
Georgia -
Idaho - Flood Warning , Areal Flood Watch, Areal Flood Advisory , Areal Flood Advisory , Areal Flood Watch , Areal Flood Advisory, Areal Flood Watch
Indiana - Flood Watch
Iowa - Public Information Statement
Kansas - Special Statement
Louisiana - Flood Warning
Maine - Public Information Statement
Maryland - Public Information Statement
Massachusetts -
Michigan - Flood Advisory
Minnesota - Flood Warning , Dense Fog Advisory , Special Statement
Missouri -
Nebraska - Special Statement , Public Information Statement
Nevada - Flood Warning , Areal Flood Advisory , High Wind Watch, Wind Advisory
New Mexico - Blowing Dust Advisory, Wind Advisory , Wind Advisory , High Wind Warning , Winter Weather Advisory , Winter Storm Warning , Fire Weather Warning , Public Information Statement
New York - Areal Flood Watch , Public Information Statement
North Carolina - Special Statement , Public Information Statement
North Dakota - Flood Warning , Dense Fog Advisory , Public Information Statement
Oklahoma - Special Statement
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Pennsylvania - Areal Flood Watch , Public Information Statement
Rhode Island -
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South Dakota - Special Statement
Texas - Wind Advisory , Blowing Dust Advisory, Wind Advisory , High Wind Warning , Fire Weather Warning , Special Statement
Utah - Wind Advisory , Winter Weather Advisory
Virginia - Public Information Statement
Washington - Flood Warning , Flood Warning, Areal Flood Warning , Areal Flood Watch , Special Statement
West Virginia - Public Information Statement
Wisconsin - Special Statement
Wyoming - Winter Weather Advisory , Winter Storm Warning , Special Statement

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