Alert archive / Louisiana / Special Marine Warnings in 2021

Special Marine Warning 261, NWS New Orleans, LA

May 20, 2021

NWS New Orleans, LA issued this special marine warning at May 20, 2021, 3:29 PM CDT. It was in force for 61 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 20, 2021, 3:29 PM CDT (20:29 UTC)
Expired
May 20, 2021, 4:30 PM CDT
In force
61 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
0.0 in
Wind
49.0 mph

What forecasters said that day

The local office's own words before this special marine warning 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 special marine warning went out at May 20, 1:27 PM CDT, 2 hours 2 minutes earlier.

Area forecast discussion, May 20, 1:27 PM CDT, 2 hours 2 minutes before
Area Forecast Discussion
National Weather Service New Orleans LA
127 PM CDT Thu May 20 2021

.UPDATE...

Forecast has been on track with regards to greater coverage areas
of showers, thunderstorms and the heavier rain swaths. Flash
flooding has been ongoing across much of the Flash Flood Warning
areas this morning and early this afternoon. Refer to Local Storm
Reports for this information. Satellite, radar and surface/upper
air analysis all show a favorable pattern and a deep tap of
subtropical moisture with precipitable water values of 1.8 to 2.1
inches in the Flash Flood Watch area through tonight and western
portions of the forecastd area into Friday. Will likely extend the
Flash Flood Watch through tonight across the western/southern
portions of the watch area, possibly including New Orleans but not
the Northshore areas. 22/TD

&&

.AVIATION...

SHRA/TSRA will result in the lower IFR to briefly LIFR conditions
where heavier rain occurs, mainly at KBTR to possibly KHDC/KMCB
this afternoon, with lower confidence in occurrence of lower
conditions at KMSY/KNEW/KASD eastward. Otherwise, mostly
prevailing MVFR due to CIGS will continue through Friday morning.
East/southeast winds will remain moderate to strong with gusts of
25 to around 30 knots at times. 22/TD

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  80  67  82  64 /  90  30  30   0
BTR  80  70  81  67 / 100  60  60  10
ASD  80  70  81  66 /  90  40  30   0
MSY  81  73  81  71 / 100  50  50  10
GPT  80  71  81  68 /  60  20  10   0
PQL  80  69  81  66 /  40  10  10   0

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...Flash Flood Watch until 7 PM CDT this evening for LAZ034>037-039-
     046>050-056>061-063>072-075>078.

     Coastal Flood Advisory until 1 AM CDT Saturday for LAZ049-050-
     057-058-060-061-066>068-072-075-077.

     Wind Advisory until 7 PM CDT this evening for LAZ058>061-063>070-
     072-075>078.

     Coastal Flood Warning until 1 AM CDT Saturday for LAZ064-069-070-
     076-078.

GM...Small Craft Advisory until 7 PM CDT Friday for GMZ530-532-534-
     536-538-550-552-555-557-570-572-575-577.

     Flash Flood Watch until 7 PM CDT this evening for GMZ530.

MS...Flash Flood Watch until 7 PM CDT this evening for MSZ068>071-077-
     080.

     Coastal Flood Advisory until 1 AM CDT Saturday for MSZ081-082.

     Wind Advisory until 7 PM CDT this evening for MSZ080>082.

     Coastal Flood Warning until 1 AM CDT Saturday for MSZ080.

GM...Small Craft Advisory until 7 PM CDT Friday for GMZ532-534-536-
     538-550-552-555-557-570-572-575-577.

&&

In the hours before

Local storm report, May 20, 10:01 AM CDT, 5 hours 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1001 AM CDT THU MAY 20 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0934 AM     TSTM WND GST     12 SSW MANDEVILLE       30.20N 90.12W
05/20/2021  M42 MPH          GMZ530             LA   MESONET

            MESONET STATION XPTN PONTCHARTRAIN CAUSEWAY.

&&
Local storm report, May 20, 12:50 PM CDT, 2 hours 39 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1250 PM CDT THU MAY 20 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1230 PM     FLASH FLOOD      3 SW PRAIRIEVILLE       30.27N 91.01W
05/20/2021                   ASCENSION          LA   BROADCAST MEDIA

            WATER IN HOMES OFF OF RIDGE RD.

&&

DM
Local storm report, May 20, 1:42 PM CDT, 1 hour 47 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
142 PM CDT THU MAY 20 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1242 PM     FLASH FLOOD      4 S BAKER               30.52N 91.15W
05/20/2021                   EAST BATON ROUGE   LA   PUBLIC

            SEVERAL ROADS AROUND THE BATON ROUGE AIRPORT
            HAVE BEEN CLOSED DUE TO FLASH FLOODING .

1250 PM     FLASH FLOOD      4 E OAK HILLS PLACE     30.38N 91.02W
05/20/2021                   EAST BATON ROUGE   LA   PUBLIC

            ROAD CLOSED AT OLD PERKINS RD E & BARINGER
            FOREMAN RD.

1251 PM     FLASH FLOOD      GREENWELL SPRING        30.57N 90.99W
05/20/2021                   EAST BATON ROUGE   LA   PUBLIC

            SEVERAL ROADS CLOSED THROUGHOUT GREENWELL
            SPRINGS.

1255 PM     FLASH FLOOD      7 ENE PRAIRIEVILLE      30.33N 90.85W
05/20/2021                   ASCENSION          LA   PUBLIC

            ROADS CLOSED NEAR FRENCH SETTLEMENT DUE TO
            HIGH WATER AND FLASH FLOODING.

0100 PM     FLASH FLOOD      3 NNW PRAIRIEVILLE      30.34N 90.99W
05/20/2021                   ASCENSION          LA   PUBLIC

            SEVERAL ROADS CLOSED ALONG HWY 73 NEAR
            PRAIRIEVILLE DUE TO FLASH FLOODING.

&&

The office that day

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

IssuedProductOfficeCountiesLasted
May 19, 7:03 PM CDTSpecial Weather StatementLIXSaint Tammany42 min
May 19, 7:24 PM CDTSpecial Marine WarningLIX81 min
May 19, 8:00 PM CDTSevere Thunderstorm WarningLIXSaint Charles, Saint John the Baptist25 min
May 19, 8:30 PM CDTSpecial Marine WarningLIX30 min
May 19, 9:19 PM CDTAreal Flood AdvisoryLIXAscension, East Baton Rouge, Iberville, Livingston116 min
May 20, 3:42 AM CDTSpecial Weather StatementLIXAscension, Assumption, Iberville, Jefferson, Plaquemines, Saint Charles and 3 more63 min
May 20, 4:05 AM CDTSpecial Marine WarningLIX55 min
May 20, 4:18 AM CDTSpecial Marine WarningLIX57 min
May 20, 5:03 AM CDTSpecial Marine WarningLIX57 min
May 20, 5:33 AM CDTSpecial Marine WarningLIX57 min
May 20, 7:00 AM CDTSpecial Weather StatementLIXAssumption, Jefferson, Lafourche, Saint Charles, Saint James60 min
May 20, 7:39 AM CDTTornado WarningLIXJefferson8 min
May 20, 7:42 AM CDTSpecial Marine WarningLIX33 min
May 20, 8:27 AM CDTSpecial Marine WarningLIX63 min
May 20, 8:37 AM CDTAreal Flood AdvisoryLIXAscension, Assumption, East Baton Rouge, Iberville, Lafourche, Livingston and 3 more52 min
May 20, 8:58 AM CDTTornado WarningLIXEast Feliciana13 min
May 20, 9:29 AM CDTFlash Flood WarningLIXAscension, East Baton Rouge, Iberville, Livingston, West Baton Rouge9 hr
May 20, 9:45 AM CDTFlash Flood WarningLIXEast Baton Rouge, East Feliciana, Saint Helena, West Feliciana11 hr
May 20, 10:04 AM CDTFlash Flood WarningLIXAscension, Assumption, Iberville, Lafourche, Livingston, Saint James and 1 more13 hr
May 20, 10:52 AM CDTSevere Thunderstorm WarningLIXSaint Charles, Saint John the Baptist19 min
May 20, 11:22 AM CDTSpecial Marine WarningLIX38 min
May 20, 11:26 AM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana, Livingston, Saint Helena94 min
May 20, 2:16 PM CDTRiver Flood WarningLIXEast Baton Rouge, Livingston68 hr
May 20, 2:22 PM CDTRiver Flood WarningLIXAscension, Livingston4 days
May 20, 2:33 PM CDTSpecial Marine WarningLIX57 min
May 20, 2:40 PM CDTRiver Flood WarningLIXEast Baton Rouge61 hr
May 20, 3:56 PM CDTGale WarningLIX19 hr
May 20, 3:56 PM CDTSmall Craft AdvisoryLIX60 hr
May 20, 3:56 PM CDTWind AdvisoryLIXOrleans, Saint Bernard, Saint John the Baptist, Saint Tammany27 hr
May 20, 4:30 PM CDTSpecial Marine WarningLIX90 min
May 20, 4:58 PM CDTSpecial Weather StatementLIXLafourche, Terrebonne47 min
May 20, 5:16 PM CDTAreal Flood AdvisoryLIXAssumption, Jefferson, Lafourche, Terrebonne3 hr
May 20, 6:42 PM CDTFlash Flood WarningLIXAscension, East Baton Rouge, Iberville, Livingston, Saint Helena, West Baton Rouge4 hr

Nearby

Special Marine Warnings in Louisiana, 2021Every special marine warning in 2021

Sources

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