Alert archive / Louisiana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 228, NWS New Orleans, LA

September 11, 1998Orleans Parish, Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Sep 11, 1998, 10:02 AM CDT for Orleans Parish, Saint Tammany Parish, Louisiana. It was in force for 43 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: Sep 11, 1998, 10:02 AM CDT (15:02 UTC)
Expired: Sep 11, 1998, 10:45 AM CDT
In force: 43 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Orleans Parish, LA, Saint Tammany Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.0 hours before the alert went out and 23 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 173 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 653 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 353 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

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

In the hours before

Local storm report, Sep 11, 6:50 AM CDT, 3 hours 12 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTION
NATIONAL WEATHER SERVICE OFFICE NEW ORLEANS LOUISIANA
650 AM CDT THU SEP 11 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....PARISH LOCATION....

0535 PM    MONTEGUT                  LA   TORNADO
09/10/98   TERREBONNE                     TREES KNOCKED DOWN.

0540 PM    CUT OFF                   LA   WIND DAMAGE
09/10/98   LAFOURCHE                      DAMAGE TO TREES AND SLIGHT
                                          DAMAGE TO AMERICAN LEGION
                                          HOME.

0620 PM    GALLIANO                  LA   TORNADO
09/10/98   LAFOURCHE                      HEAVY RAINFALL. ONE HOUSE
                                          DESTROYED AND NINE OTHER
                                          HOUSES WERE AFFECTED.

0815 PM    DES ALLEMANDS             LA   FLOODING
09/10/98   ST CHARLES                     COUPLE OF HOUSES WERE
 l                                         FLOODED.

0900 PM    DES ALLEMANDS             LA   WIND DAMAGE
09/10/98   ST CHARLES                     GUSTY WINDS DOWNED SEVERAL
                                          TREES

Local storm report, Sep 11, 6:50 AM CDT, 3 hours 12 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTION
NATIONAL WEATHER SERVICE OFFICE NEW ORLEANS LOUISIANA
650 AM CDT THU SEP 11 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....PARISH LOCATION....

0535 PM    MONTEGUT                  LA   TORNADO
09/10/98   TERREBONNE                     TREES KNOCKED DOWN.

0540 PM    CUT OFF                   LA   WIND DAMAGE
09/10/98   LAFOURCHE                      DAMAGE TO TREES AND SLIGHT
                                          DAMAGE TO AMERICAN LEGION
                                          HOME.

0620 PM    GALLIANO                  LA   TORNADO
09/10/98   LAFOURCHE                      HEAVY RAINFALL. ONE HOUSE
                                          DESTROYED AND NINE OTHER
                                          HOUSES WERE AFFECTED.

0815 PM    DES ALLEMANDS             LA   FLOODING
09/10/98   ST CHARLES                     COUPLE OF HOUSES WERE
 l                                         FLOODED.

0900 PM    DES ALLEMANDS             LA   WIND DAMAGE
09/10/98   ST CHARLES                     GUSTY WINDS DOWNED SEVERAL
                                          TREES

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 10, 7:06 PM CDT	Tornado Warning	LIX	Jefferson	29 min
Sep 10, 8:41 PM CDT	Tornado Warning	LIX	Saint Charles	34 min
Sep 11, 10:50 AM CDT	Flash Flood Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Tammany	2 hr
Sep 11, 12:07 PM CDT	Tornado Warning	LIX	Plaquemines	33 min
Sep 11, 12:51 PM CDT	Flash Flood Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	3 hr
Sep 11, 12:51 PM CDT	Flash Flood Warning	LIX	Saint Tammany	3 hr
Sep 11, 2:14 PM CDT	Tornado Warning	LIX	Orleans, Saint Bernard	36 min
Sep 11, 2:14 PM CDT	Tornado Warning	LIX	Orleans, Saint Bernard	41 min
Sep 11, 5:15 PM CDT	Flash Flood Warning	LIX	Plaquemines, Saint Bernard	3 hr
Sep 11, 5:34 PM CDT	Flash Flood Warning	LIX	Jefferson, Orleans	3 hr
Sep 11, 8:35 AM CDT	Severe Thunderstorm Warning	LIX	Harrison, Jackson	60 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1998 Every severe thunderstorm warning in 1998

Sources

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