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NWS Memphis Product Guide -- Hydrologic Products

Your National Weather Service in Memphis also serves the river community in parts of 57 counties, including the St. Francis, Obion, Forked Deer, Tallahatchie, Tombigbee, and Mississippi River basins, by issuing summaries, statements, watches, and warnings.  We also serve our forecast area with Flood watches, warnings, and statements when heavy rain threatens.
� Flood Potential Outlook (ESF)   Latest Flood Potential Outlook
The "Flood Potential Outlook" is used for two purposes.  First, we issue the Flood Potential Outlook several times each spring to discuss the possibility for river flooding during the spring due to snowmelt and runoff due to high soil moisture.  The product is also issued when heavy rain may cause rivers to rise above flood stage.   
� Hydrologic Summary (RVA)  Latest Hydrologic Summary
The "Hydrologic Summary" is a daily report of observed river and lake stages and 24 hour changes for a number of river gauges across the area.  The flood stages, for locations where flood stage has been defined, are also shown.  This product is issued daily between 8am and 9am.
� Daily River and Lake Summary (RVD) Latest Daily River and Lake Summary
The "Daily River and Lake Summary" is a daily report of river stages, 24 hour changes, and a three day forecast.  It also includes a few lake and reservoir stages.  All river points designated as "forecast points" are included in this summary. 
� Hydrologic Statement (RVS) Latest Hydrologic Statement
A "Hydrologic Statement" is issued when a special hydrologic circumstances occur. Statements may include particular information on river stages, lake levels, and ice conditions.
� Flood Warning (FLW) Latest River Flood Warning
A "Flood Warning" is issued when river flooding is expected.  It is issued once a river is forecast to go above its designated flood stage at the forecast point.  The warning will be updated by Flood Statements, unless additional flooding is forecast; then another Flood Warning may be issued. 
� Flood Statement (FLS) Latest Flood Statement
A "Flood Statement" is used to update information on a river in flood, or to terminate a flood warning.  It also is used to update information on a Flood Watch. 
� Flood Watch (FFA) Mid-South Watches/Warnings
A "Flood Watch" is issued to inform the public and cooperating agencies that current and developing weather is such that there is a threat of rapid flooding (also known as flash flooding).  The occurrence of flooding is neither certain nor imminent.  Persons in the watch area are advised to check flood action plans, keep informed, and be ready to take necessary actions if a warning is issued or flooding is observed.  A flood watch may also be issued for a dam break.
The "Flash Flood Watch" is now called a "Flood Watch."  The NWS no longer calls these "Flash Flood Watch"es.
� Flash Flood Warning (FFW) Mid-South Watches/Warnings
A "Flash Flood Warning" is issued to inform the public that flooding is imminent or in progress.  It focuses on specific counties, communities, streams, or areas.  This product is now used in place of the "Urban and Small Stream Flood Advisory," which still exists but will rarely be issued. 
� Flash Flood Statement (FFS) Latest Flash Flood Statement
A "Flash Flood Statement" is used to update information on a flash flood warning, or to terminate a flash flood warning.  
� Dam Break Warning (FFW)  
If a dam break has occurred or is imminent, a "Flash Flood Warning" is issued for the dam break.  The warning includes affected counties, the agency verifying the dam break, the name of the dam, the name of the river, the nearest downstream town and its distance from the dam, travel time of the crest, and a forecast of the crest height if known.   
 
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National Weather Service
Memphis, TN
7777 Walnut Grove Rd. OM-1
Memphis,TN 38120
901-544-0399
Page Author: WFO Memphis, TN
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Date modified: December 8, 2006
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