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506 AM CDT Sat May 26 2018
...FLASH FLOOD WATCH NOW IN EFFECT THROUGH TUESDAY EVENING...
The Flash Flood Watch is now in effect for
* portions of southeast Louisiana and Mississippi, including the
following areas, in southeast Louisiana, Ascension,
Assumption, East Baton Rouge, Iberville, Livingston, Lower
Jefferson, Lower Lafourche, Lower Plaquemines, Lower St.
Bernard, Lower Terrebonne, Orleans, Southern Tangipahoa, St.
Charles, St. James, St. John The Baptist, St. Tammany, Upper
Jefferson, Upper Lafourche, Upper Plaquemines, Upper St.
Bernard, Upper Terrebonne, and West Baton Rouge. In
Mississippi, Hancock, Harrison, and Jackson.
* through Tuesday evening
* For today, widespread 2 to 4 inches of rainfall likely in
swaths along lake and sea breeze boundaries. Some locally higher
amounts possible. Rain rates 2 to 3 inches per hour at times.
* For Sunday through Tuesday, Alberto will set the stage for
extended periods of heavy rainfall training. Several inches to
over a foot of rainfall may be possible in isolated locations.
The Mississippi Gulf coast has the highest potential for these
* POTENTIAL IMPACTS OF FLOODING include flooding of streets and
low lying areas. Increased water levels on area rivers and
streams. High rain rates may briefly overwhelm pumping
capacities until rates diminish.
A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.
Additional Flash Flood Watches may be extended in area and time
at a later time throughout the weekend as the situation unfolds.
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
Subtropical Storm Alberto Local Statement Advisory Number 3
National Weather Service New Orleans LA AL012018
1035 PM CDT Fri May 25 2018
This product covers Southeast Louisiana and South Mississippi
**TROPICAL STORM AND STORM SURGE WATCHES IN EFFECT FOR PORTIONS OF
SOUTHEAST LOUISIANA AND COASTAL MISSISSIPPI**
* CHANGES TO WATCHES AND WARNINGS:
* CURRENT WATCHES AND WARNINGS:
- A Storm Surge Watch and Tropical Storm Watch are in effect for
Hancock, Harrison, Jackson, Lower Plaquemines, Lower St.
Bernard, Orleans, and Upper St. Bernard
- A Tropical Storm Watch is in effect for Ascension, Livingston,
Lower Jefferson, Southern Tangipahoa, St. Charles, St. James,
St. John The Baptist, St. Tammany, Upper Jefferson, and Upper
* STORM INFORMATION:
- About 780 miles south-southeast of New Orleans LA or about 790
miles south-southeast of Gulfport MS
- 19.4N 85.7W
- Storm Intensity 40 mph
- Movement East or 90 degrees at 5 mph
OVERVIEW...At 1000 PM CDT, Sub-Tropical Storm Alberto was moving east near 5 mph
off the coast of the Yucatan Peninsula. The system is expected to begin drifting
to the north later tonight and move into the southern Gulf of Mexico Saturday.
Tropical impacts should begin to be felt across Southeast Louisiana and Southern
Mississippi by late Sunday and Sunday night and persist through Tuesday morning.
The primary impact will be heavy rainfall that could produce inland flooding.
Secondary impacts will be storm surge, tornadoes, and tropical storm force winds.
* FLOODING RAIN:
Prepare for locally hazardous rainfall flooding having possible
limited impacts across Southeast Louisiana and South Mississippi.
Potential impacts include:
- Localized rainfall flooding may prompt a few evacuations.
- Rivers and tributaries may quickly rise with swifter currents.
Small streams, creeks, canals, and ditches may become swollen
and overflow in spots.
- Flood waters can enter a few structures, especially in usually
vulnerable spots. A few places where rapid ponding of water
occurs at underpasses, low-lying spots, and poor drainage
areas. Several storm drains and retention ponds become
near-full and begin to overflow. Some brief road and bridge
Prepare for dangerous wind having possible significant impacts across
Southeast Louisiana and South Mississippi. Potential impacts include:
- Some damage to roofing and siding materials, along with damage
to porches, awnings, carports, and sheds. A few buildings
experiencing window, door, and garage door failures. Mobile
homes damaged, especially if unanchored. Unsecured lightweight
objects become dangerous projectiles.
- Several large trees snapped or uprooted, but with greater
numbers in places where trees are shallow rooted. Several
fences and roadway signs blown over.
- Some roads impassable from large debris, and more within urban
or heavily wooded places. A few bridges, causeways, and access
- Scattered power and communications outages, but more prevalent
in areas with above ground lines.
Prepare for life-threatening surge having possible significant
impacts across the immediate coast of Mississippi and also
for east facing shores outside of the hurricane protection system
in far Southeast Louisiana. Potential impacts in
this area include:
- Areas of inundation with storm surge flooding accentuated by
waves. Damage to several buildings, mainly near the coast.
- Sections of near-shore escape routes and secondary roads become
weakened or washed out, especially in usually vulnerable low
- Major beach erosion with heavy surf breaching dunes. Strong and
numerous rip currents.
- Moderate damage to marinas, docks, boardwalks, and piers.
Several small craft broken away from moorings, especially in
Also, prepare for locally hazardous surge having possible limited
impacts along the shores of Lake Pontchartrain and Lake Maurepas.
Elsewhere across Southeast Louisiana and South Mississippi, little to
no impact is anticipated.
* OTHER PREPAREDNESS INFORMATION:
Now is the time to check your emergency plan and emergency supplies
kit and take necessary actions to protect your family and secure your
home or business.
When making safety and preparedness decisions, do not focus on the
exact forecast track since hazards such as flooding rain, damaging
wind gusts, storm surge, and tornadoes extend well away from the
center of the storm.
If in a place that is vulnerable to high wind, such as near large
trees, a manufactured home, upper floors of a high-rise building, or
on a boat, plan to move to safe shelter.
If you live in a place particularly vulnerable to flooding, such as
near the ocean or a large inland lake, in a low-lying or poor
drainage area, in a valley, or near an already swollen river, plan to
move to safe shelter on higher ground.
Always heed the advice of local officials and comply with orders that
are issued. Do not needlessly jeopardize your life or the lives of
When securing your property, outside preparations should be concluded
as soon as possible before conditions deteriorate. The onset of
strong gusty winds or flooding can cause certain preparedness
activities to become unsafe.
Be sure to let friends and family members know of your intentions for
weathering the storm and your whereabouts. Have someone located away
from the threatened area serve as your point of contact. Share vital
contact information with others. Keep cell phones handy and charged.
Check on those who may not be fully aware of the situation or who are
unable to make personal preparations.
If you are a visitor, know the name of the county or parish in which
you are located and where it is relative to current watches and
warnings. If staying at a hotel, ask the management staff about their
onsite disaster plan. Listen for evacuation orders, especially
pertaining to area visitors.
Closely monitor weather.gov, NOAA Weather Radio and local news
outlets for official storm information. Listen for possible changes
to the forecast.
There is a threat from tornadoes with this storm. Have multiple ways
to receive Tornado Warnings. Be ready to shelter quickly.
* ADDITIONAL SOURCES OF INFORMATION:
- For information on appropriate preparations see ready.gov
- For information on creating an emergency plan see getagameplan.org
- For additional disaster preparedness information see redcross.org
The next local statement will be issued by the National Weather
Service in New Orleans LA around 2 AM CDT, or sooner if conditions