Weather Alert in Maryland

Recent Locations: Clarksville, MD

Flood Warning issued May 15 at 5:17AM EDT until May 16 at 10:37PM EDT by NWS Baltimore MD/Washington DC

AREAS AFFECTED: Frederick, MD; Loudoun, VA

DESCRIPTION: ...The Flood Warning is extended for the following rivers in Maryland...West Virginia...Virginia... Potomac River at Hancock affecting Morgan and Washington Counties. Potomac River at Little Falls affecting Montgomery and Fairfax Counties. ...The Flood Warning continues for the following rivers in Maryland...West Virginia...Virginia... Potomac River at Shepherdstown affecting Berkeley, Jefferson and Washington Counties. Potomac River at Harpers Ferry affecting Jefferson and Washington Counties. Potomac River at Edwards Ferry affecting Montgomery and Loudoun Counties. Potomac River at Point of Rocks affecting Frederick and Loudoun Counties. For the Potomac River...including Paw Paw, Hancock, Shepherdstown, Harpers Ferry, Point of Rocks, Edwards Ferry, Little Falls... Moderate flooding is forecast. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Potomac River at Point of Rocks. * WHEN...Until late Friday evening. * IMPACTS...At 23.0 feet, Floodwaters completely cover the comfort station at the Brunswick boat ramp, and reach the comfort station at the Point of Rocks boat ramp. The upper parking lot at the Point of Rocks boat ramp begins to flood. * ADDITIONAL DETAILS... - At 4:45 AM EDT Thursday the stage was 21.5 feet, or 5.5 feet above flood stage. - Recent Activity...The maximum river stage in the 24 hours ending at 4:45 AM EDT Thursday was 21.5 feet. - Forecast...The river is expected to rise to a crest of 23.6 feet this morning. It will then fall below flood stage Friday afternoon. - Flood stage is 16.0 feet. - Flood History...This crest compares to a previous crest of 23.5 feet on 06/18/1910. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information

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. Additional information is available at www.weather.gov/washington or www.weather.gov/baltimore. The next statement will be issued this afternoon at 130 PM EDT.

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Weather Topic: What are Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds

Weather Topic: What are Altostratus Clouds?

Home - Education - Cloud Types - Altostratus Clouds

Next Topic: Cirrocumulus Clouds

Altostratus clouds form at mid to high-level altitudes (between 2 and 7 km) and are created by a warm, stable air mass which causes water vapor to condense as it rise through the atmosphere. Usually altostratus clouds are featureless sheets characterized by a uniform color.

In some cases, wind punching through the cloud formation may give it a waved appearance, called altostratus undulatus. Altostratus clouds are commonly seen with other cloud formations accompanying them.

Next Topic: Cirrocumulus Clouds