Weather Alert in Missouri
Flood Warning issued March 9 at 10:05AM CDT until March 12 at 4:41AM CDT by NWS St Louis MO
AREAS AFFECTED: Jefferson, MO; St. Louis, MO
DESCRIPTION: ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Kaskaskia River at Carlyle. Meramec River at Valley Park. Meramec River near Eureka. Meramec River near Sullivan. River forecasts are based on observed precipitation and forecast precipitation for the next 48 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Meramec River near Eureka. * WHEN...Until late Wednesday night. * IMPACTS...At 22.0 feet, Willman Road near the Highway 109 bridge becomes inundated and impassable. * ADDITIONAL DETAILS... - At 9:30 AM CDT Monday the stage was 21.3 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:30 AM CDT Monday was 23.2 feet. - Forecast...The river will fall to 21.2 feet this afternoon. It will then rise to 21.7 feet tomorrow morning. It will fall below flood stage late tomorrow evening to 8.3 feet early Saturday afternoon then rise again. - Flood stage is 19.0 feet.
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Motorists should not attempt to drive around barricades or drive cars through flooded areas. Be especially cautious at night when it is harder to recognize the dangers of flooding. Rainfall heavier than forecast could cause river levels to rise even higher than predicted. The National Weather Service will monitor this developing situation and issue follow up statements as conditions change. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx
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Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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