Alert archive / Louisiana / Flash Flood Watches in 2018

Flash Flood Watch 7, NWS New Orleans, LA

December 7, 20188 parishes in Louisiana

NWS New Orleans, LA issued this flash flood watch at Dec 7, 2018, 2:55 PM CST for 8 parishes in Louisiana. It took effect at Dec 8, 2018, 6:00 AM CST. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
Dec 7, 2018, 2:55 PM CST (20:55 UTC)
In effect from
Dec 8, 2018, 6:00 AM CST
Expired
Dec 8, 2018, 3:32 PM CST
In force
10 hr
Issued by
NWS New Orleans, LA
Flood severity
None

Counties Assumption Parish, LA, East Baton Rouge Parish, LA, Iberville Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, West Baton Rouge Parish, LA

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New Orleans, LA wrote its last area forecast discussion before this flash flood watch went out at Dec 7, 11:39 AM CST, 3 hours 16 minutes earlier.

Area forecast discussion, Dec 7, 11:39 AM CST, 3 hours 16 minutes before
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Hazardous weather outlook, Dec 7, 9:55 AM CST, 5 hours before
Hazardous Weather Outlook
National Weather Service New Orleans LA
955 AM CST Fri Dec 7 2018

GMZ530-532-534-536-538-550-552-555-557-570-572-575-577-LAZ034>037-
039-040-046>050-056>072-MSZ068>071-077-080>082-080400-
Lake Pontchartrain and Lake Maurepas-Mississippi Sound-
Lake Borgne-Chandeleur Sound-Breton Sound-
Coastal Waters from Port Fourchon LA to Lower Atchafalaya River
LA out 20 nm-
Coastal waters from the Southwest Pass of the Mississippi River
to Port Fourchon Louisiana out 20 NM-
Coastal Waters from Boothville LA to Southwest Pass of the
Mississippi River out 20 nm-
Coastal waters from Pascagoula Mississippi to Stake Island out
20 NM-
Coastal waters from Port Fourchon Louisiana to Lower Atchafalaya
River LA from 20 to 60 NM-
Coastal waters from Southwest Pass of the Mississippi River to
Port Fourchon Louisiana from 20 to 60 NM-
Coastal Waters from Stake Island LA to Southwest Pass of the
Mississippi River from 20 to 60 nm-
Coastal waters from Pascagoula Mississippi to Stake Island
Louisiana out 20 to 60 NM-Pointe Coupee-West Feliciana-
East Feliciana-St. Helena-Washington-St. Tammany-Iberville-
West Baton Rouge-East Baton Rouge-Ascension-Livingston-Assumption-
St. James-St. John The Baptist-Upper Lafourche-St. Charles-
Upper Jefferson-Orleans-Upper Plaquemines-Upper St. Bernard-
Upper Terrebonne-Lower Terrebonne-Lower Lafourche-Lower Jefferson-
Lower Plaquemines-Lower St. Bernard-Northern Tangipahoa-
Southern Tangipahoa-Wilkinson-Amite-Pike-Walthall-Pearl River-
Hancock-Harrison-Jackson-
955 AM CST Fri Dec 7 2018

This Hazardous Weather Outlook is for portions of Southeast
Louisiana...South Mississippi and the adjacent coastal waters.

.DAY ONE...Today and Tonight

A Small Craft Advisory is in effect for all of the coastal waters
excluding the tidal lakes after midnight tonight as winds increase
above 20 knots.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

A low pressure system will bring a period of heavy rainfall to
the area on Saturday. Rainfall of 1 to 3 inches with locally
higher amounts can be expected with this system. Although much of
the area could likely handle the rain and this should be a
relative short duration event, given the possible intensity of
the rainfall a Flash Flood Watch may be needed for much of the
area Saturday.

In addition to the heavy rain threat there is also a small
concern for strong to severe weather. At this time the area most
likely to see this impact would be along the immediate coast.
This will be highly dependent on the track of the low pressure
system and any deviation could increase or decrease the risk of
severe weather.

Strong winds associated with the area of low pressure will bring
small craft advisory conditions to the coastal waters from
Saturday through Monday. Winds in excess of 20 knots and seas in
excess of 7 feet can be expected over the open Gulf waters.

.SPOTTER INFORMATION STATEMENT...

The activation of storm spotters, ham radio operators, and
emergency management personnel in support of severe weather
operations may be needed Saturday, December 8th.

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 7, 3:07 AM CSTSmall Craft AdvisoryLIX4 days
Dec 7, 10:04 AM CSTRiver Flood WarningLIXTangipahoa46 hr
Dec 7, 10:07 AM CSTRiver Flood WarningLIXSaint Tammany46 hr
Dec 7, 10:11 AM CSTRiver Flood WarningLIXSaint Tammany49 hr
Dec 7, 10:17 AM CSTRiver Flood WarningLIXSaint Tammany, Washington11 days
Dec 7, 10:17 AM CSTRiver Flood WarningLIXSaint Tammany6 days
Dec 7, 10:11 AM CSTRiver Flood WarningLIXPike, Walthall3 days
Dec 7, 10:24 AM CSTRiver Flood WarningLIXPearl River69 hr
Dec 7, 10:24 AM CSTRiver Flood WarningLIXPearl River4 days

Nearby

Flash Flood Watches in Louisiana, 2018Flash Flood Watches in Mississippi, 2018Every flash flood watch in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.