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  Home > Experimental Tropical Cyclone Hazards Graphics > Tropical Cyclone Impact
Note: This is a summary graphic depicting the impacts expected over the full duration of the storm from this hazard. Detailed forecast products providing times, durations, and numerical forecasts associated with this hazard are provided at this WFO's web page:

Brownsville, Texas
Inland Flooding Impact
Wind Tornadoes Inland Flooding Coastal Flooding
Impacts by County from inland flooding for the NWS Brownsville, Texas warning area
 
None
 
Low
 
Moderate
 
High
 
Extreme
Alabama
Mobile

Florida
Jacksonville
Key West
Melbourne
Miami
Pensacola
Tallahassee
Tampa Bay

Louisiana
Lake Charles

Maryland
Baltimore/Washington

New Jersey
Mount Holly

New York
New York City/Upton

North Carolina
Newport/Morehead City
Wilmington

Pennsylvania
Philadelphia

South Carolina
Charleston

Texas
Brownsville
Corpus Christi

Virginia
Wakefield

Washington, DC
Baltimore/Washington


Inland Flooding Impacts Definitions
Read this office's detailed Hurricane Local Statement

Inland Flooding impacts:
The Inland Flooding impacts detailed in this WFOs Inland Flooding Graphics are not associated with riverine flooding. Specific river observations and river stage forecasts in this WFO's area of responsibility are available from their Advanced Hydrologic Prediction Service (AHPS) web site, at: Brownsville, Texas
None Threat - Limited or no discernible threat to life and property; the likelihood for higher rain totals to remain below, or just approach, flash flood guidance.

Minimum Action - Listen for forecast changes; review flooding safety rules, and prepare for the possibility of nuisance ponding or standing water in normally prone areas.

Potential Impact - If heavy rain falls, nuisance ponding or standing water is expected, otherwise no problems are expected.

Low Threat - An elevated threat to life and property; the likelihood for higher rain totals to approach flash flood guidance.

Minimum Action - Prepare for damage consistent with very minor inland flooding.

Potential Impact - Residents can expect nuisance flooding of roads with poor drainage. Ponding will occur elsewhere. Known intersections with very poor drainage may have water levels of 1 to 2 feet. Other poor drainage areas will have water rises up to 1 foot. Urban Flood Advisories may be needed.

Moderate Threat - A significant threat to life and property; the likelihood for higher rain totals to exceed flash flood guidance.

Minimum Action - Prepare for damage consistent with minor to moderate inland flooding.

Potential Impact - Residents can expect widespread flooding, especially in poor drainage locations. In these areas, minor to moderate property damage is expected, and several main thoroughfares may be closed. Known intersections with very poor drainage may have water levels up to 2 to 4 feet. Other poor drainage areas may have water rises up to 2 feet. Levels will rise up to 1 foot elsewhere.

Most small streams and arroyos will approach, or possibly exceed, bank full.

High Threat - A critical threat to life and property; the likelihood for higher rain totals to well exceed flash flood guidance.

Minimum Action - Prepare for damage consistent with major inland flooding.

Potential Impact - Widespread flooding is possible. Persons living near or in poor drainage locations should prepare for possible evacuation. In these areas, significant property damage will occur, and some power outages are likely. Minor property damage is possible elsewhere. Water levels in very poor drainage areas will rise over 4 feet. Other poor drainage locations will have rises up to 4 feet. Elsewhere, expect water rises to near 2 feet. Many resacas will overflow. Numerous main roads will be closed. Driving is highly discouraged except in emergencies.

All streams, arroyos, and rivers in affected areas will rise, with some reaching or exceeding flood stage. Normally quick rising streams, arroyos, and rivers will exceed flood stage by several feet, flooding homes along their shorelines. Pastures will also flood, but livestock losses should be minimal. Several secondary roads and low-water bridges will be washed out.

Extreme Threat - An extreme threat to life and property; the likelihood for higher rain totals to greatly exceed flash flood guidance.

Minimum Action - Prepare for damage consistent with very major inland flooding.

Potential Impact - Widespread catastrophic flooding is possible. Residents in flood prone areas should rush to completion preparations to protect their property, then move to a place of safety. Mandatory evacuations are underway in flood prone locations.

Life threatening flooding is likely. In urban areas, extensive property damage will occur in all poor drainage areas, with moderate to major property damage elsewhere. Widespread power outages are likely, and most resacas will overflow.

In rural locations, all small streams, creeks, and arroyos will exceed bank full for more than 6 hours, flooding homes - even those up to one half mile away from the banks. In all areas, hundreds of roads will flood. Dozens of secondary roads may become washed out in rural areas. Numerous bridges will likely wash out. Extensive pasture flooding will occur as water levels rise to 2 feet or more. Widespread livestock losses are likely.

All rivers in affected areas will rise; most will exceed flood stage. Quick rising rivers will exceed flood stage - and reach near record crests, causing inundation of nearby homes.

Minor Flooding - Within 6 hours after heavy rain, small streams, creeks, canals, and drainage ditches become swollen and overflow in a few places. In flatter terrain, quick ponding of water occurs around low-lying spots, especially in historically vulnerable locations. In urban places, quick ponding of water occurs at certain underpasses or poor drainage spots, especially in historically vulnerable locations. Storm drains and retention ponds become near-full and begin to overflow in a few places. In mountain areas, runoff moves down the valley and is becoming a concern, especially in river valleys. Flood waters generally affect a few buildings and roads.

Moderate Flooding - Within 6 hours after heavy rain, rivers and tributaries become swollen and may begin to overspill their banks in a few places, especially in historically vulnerable locations. Small streams, creeks, canals, and drainage ditches overflow. Normally dry gullies or dry creek beds or arroyos become alive. In flatter terrain, expanded areas of rapid inundation occur around low-lying spots covering several secondary roads. In urban places, expanded areas of rapid inundation occur at several underpasses or poor drainage spots, with some streets and parking lots taking on moving water. Storm drains and resacas may overflow. Flood waters generally affect several buildings and roads.

Major Flooding - Within 6 hours after heavy rain, rivers and tributaries overflow their banks in several places. Small streams, creeks, canals, and drainage ditches become dangerous rivers. Normally dry arroyos or dry creek beds become alive with dangerous and fast moving water. In flatter terrain, extensive inundation occurs covering both primary and secondary roads. In urban places, widespread inundation occurs, with streets and parking lots becoming rivers of moving water. All resacas will flood. Flood waters generally affect many buildings and roads.

Wind
Click for wind impacts for the NWS Brownsville, Texas warning area
Tornadoes
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Inland Flooding
Click for inland flooding impacts for the NWS Brownsville, Texas warning area
Coastal Flooding
Click for coastal flooding impacts for the NWS Brownsville, Texas warning area
None Low Moderate High Extreme
 

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     Page last Modified: 8 June, 2009 11:45 AM