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    Early Week Flood Threat Targets Pittsburgh, Philly, NYC

    By By Brian Edwards, Meteorologist
    August 12, 2014, 5:35:29 AM EDT

    After a warm and dry weekend across the mid-Atlantic states, a potent early week storm will generate drenching showers and thunderstorms, bringing a threat for flash flooding to many locations.

    The same storm system has already wreaked havoc in the Southeast, causing one fatality in South Carolina due to flash flooding.

    Potent low pressure will strengthen over the Ohio Valley on Monday, tapping into abundant moisture from the south, which will provide fuel for the drenching storms.

    Heavy thunderstorms are already affecting much of the state of Ohio, bringing torrential downpours to cities such as Columbus, Cleveland, Zanesville, and Youngstown.


    By the time the evening commute rolls around on Monday, the heavy rain threat will transition into western Pennsylvania.

    Many locations will pick up between two and four inches of rainfall with locally higher amounts possible. Rainfall to this magnitude will lead to flooding of streams and creeks.

    In urban areas such as Pittsburgh, Columbus, Cleveland, and Erie, there is a risk of street and highway flooding, which can cause major delays for commuters traveling along Interstates 80, 76 and 79.

    Interactive Northeast US Radar
    MAP: Flood-Related Watches, Warnings
    Fall 2014 Outlook: South at Risk for Tropical Hit

    As the aforementioned storm shifts northeastward on Monday night into Tuesday, the threat for drenching thunderstorms will transition into central and eastern Pennsylvania as well as New Jersey and parts of New York.

    Two to four inches of rain will fall from Harrisburg, Pennsylvania to Philadelphia, Pennsylvania to New York City, New York, leading to an urban and small stream flood threat.


    The evening commute on Tuesday will be very slow from New York City to Philadelphia. Some commuters may even face detours around any localized flooding problems that develop.

    These drenching storms will slowly shift into central New England by Tuesday night as cooler and drier air filters into the mid-Atlantic states.

    With many areas at or above their normal rainfall for the summer, flash flooding can occur rather quickly. Heavy rainfall will easily runoff into small streams, causing them to rise rapidly.

    The same storm system set to hit the Northeast has already proved deadly after flash flooding in Greenville County, South Carolina claimed the life of one woman. Travelling in a car, the woman and her partner managed to escape their vehicle as it was being swept away by swift waters, but did not escape the inundated area in time. The man is still missing.

    Small creeks can quickly turn into dangerous, fast-flowing bodies of water. Caution should be used when approaching these creeks as well as roadways that are covered with water.

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