Weather Alert in Iowa
Severe Thunderstorm Watch issued August 15 at 12:30PM CDT until August 15 at 5:00PM CDT by NWS Des Moines IA
AREAS AFFECTED: Boone, IA; Calhoun, IA; Carroll, IA; Cerro Gordo, IA; Emmet, IA; Franklin, IA; Greene, IA; Hamilton, IA; Hancock, IA; Hardin, IA; Humboldt, IA; Kossuth, IA; Marshall, IA; Palo Alto, IA; Pocahontas, IA; Sac, IA; Story, IA; Webster, IA; Winnebago, IA; Worth, IA; Wright, IA
DESCRIPTION: THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 589 IN EFFECT UNTIL 5 PM CDT THIS AFTERNOON FOR THE FOLLOWING AREAS IN IOWA THIS WATCH INCLUDES 21 COUNTIES IN CENTRAL IOWA BOONE HAMILTON HARDIN MARSHALL STORY WEBSTER IN NORTH CENTRAL IOWA CERRO GORDO FRANKLIN HANCOCK HUMBOLDT KOSSUTH WINNEBAGO WORTH WRIGHT IN NORTHWEST IOWA EMMET PALO ALTO POCAHONTAS IN WEST CENTRAL IOWA CALHOUN CARROLL GREENE SAC THIS INCLUDES THE CITIES OF ACKLEY, ALGONA, AMES, BELMOND, BOONE, BRITT, CARROLL, CLARION, CLEAR LAKE, EAGLE GROVE, EARLY, ELDORA, EMMETSBURG, ESTHERVILLE, FONDA, FOREST CITY, FORT DODGE, GARNER, GILMORE CITY, HAMPTON, HUMBOLDT, IOWA FALLS, JEFFERSON, KANAWHA, LAKE CITY, LAKE MILLS, LAKE VIEW, LAURENS, MANLY, MANSON, MARSHALLTOWN, MASON CITY, NORTHWOOD, ODEBOLT, POCAHONTAS, POMEROY, ROCKWELL CITY, ROLFE, SAC CITY, SCHALLER, WALL LAKE, AND WEBSTER CITY. * PRIMARY THREATS INCLUDE... SCATTERED DAMAGING WIND GUSTS TO 70 MPH LIKELY. ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE. PROBABILITY TABLE: PROB OF 2 OR MORE TORNADOES : 10% PROB OF 1 OR MORE STRONG /EF2-EF5/ TORNADOES : 05% PROB OF 10 OR MORE SEVERE WIND EVENTS : 60% PROB OF 1 OR MORE WIND EVENTS >= 75 MPH : 20% PROB OF 10 OR MORE SEVERE HAIL EVENTS : 30% PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES : 20% PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : 80% MEAN STORM MOTION /MPH/ : E 40
INSTRUCTION: N/A
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Weather Topic: What are Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds
Weather Topic: What are Cumulus Clouds?
Home - Education - Cloud Types - Cumulus Clouds
Next Topic: Drizzle
Cumulus clouds are fluffy and textured with rounded tops, and
may have flat bottoms. The border of a cumulus cloud
is clearly defined, and can have the appearance of cotton or cauliflower.
Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall,
becoming cumulus congestus and possibly the even taller cumulonimbus clouds.
When cumulus clouds become taller, they have a greater chance of producing precipitation.
Next Topic: Drizzle
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