The National Weather Service in Huntsville also serves
the river community in 11 northern Alabama counties, and
three counties in southern Middle Tennessee, including almost
the entire Tennessee River basin in North Alabama. We issue summaries,
statements, watches, and warnings. We also serve our
forecast area with Flood watches, warnings, and statements
when heavy rain threatens.
| Hydrologic Outlook (ESF) |
Latest
Hydrologic Outlook
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The "Hydrologic
Outlook" is used for three purposes.
First, we issue the Flood Potential Outlook once
each spring to discuss the possibility for river
flooding during the spring due to snowmelt upstream
and runoff due to high soil moisture. The
product is also issued when heavy rain may cause
rivers to rise above flood stage. It is usually
issued a day or two in advance of the event.
We also issue a Hydrologic Outlook if drought
conditions
are occurring in the area.
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| Hydrologic Summary (RVA) |
Latest
Hydrologic Summary
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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.
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| Daily River and Lake Summary (RVD) |
Latest
Daily River & Lake Summary
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The "Daily River and Lake
Summary" is a daily report of river stages, 24 hour
changes, and a five day forecast. It also includes
a few lake and reservoir stages. All river points
designated as "forecast points" are included in
this summary.
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| Flood Warning (FLW) |
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Flood Warning
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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.
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| Flood Statement (FLS) |
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Flood Statement
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A "Flood Statement"
is used to update information on a river in flood,
or to terminate a flood warning.
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| Flood Watch (FFA) |
TN Valley Watches/Warnings |
A "Flood Watch"
or "Flash 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), or widespread river 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 flash
flood watch may also be issued for a dam break.
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| Flash Flood Warning (FFW) |
TN Valley 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. Flash
Flood Warnings are issued for flooding usually
occurring within 6 hours of heavy rain.
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| Dam Break Warning (FFW) |
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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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