Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 70, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Sep 4, 1990, 9:34 PM CDT for Saint James Parish, Louisiana. It was in force for 56 min.
The area
The counties it named.
The facts
- Issued
- Sep 4, 1990, 9:34 PM CDT (02:34 UTC)
- Expired
- Sep 4, 1990, 10:30 PM CDT
- In force
- 56 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
County Saint James Parish, LA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 00:00Z, 2.6 hours before the alert went out and 108 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.
- Mixed-layer CAPE
- 1824 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 1659 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.3
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
Special weather statement, Sep 4, 8:09 PM CDT, 1 hour 25 minutes before
LAZ009-050300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 810 PM CDT TUE SEP 4 1990 ...A BAND OF THUNDERSTORMS WERE MOVING TOWARD THE BATON ROUGE METROPOLITAN AREA... RADAR SHOWED THUNDERSTORMS FROM NEAR INDIAN MOUND TO MONTPELIER. MOVING WEST SOUTHWEST AT 15 MPH. AS THESE THUNDERSTORMS MOVE THROUGH THE AREA...THEY WILL PRODUCE STRONG GUSTY WINDS...HEAVY RAINS...FREQUENT LIGHTNING WITH SOME SMALL HAIL. THESE CONDITIONS SHOULD LAST UNTIL 10 PM TONIGHT.
Special weather statement, Sep 4, 9:03 PM CDT, 31 minutes before
LAZ009-050400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 905 PM CDT TUE SEP 4 1990 ...BAND OF THUNDERSTORMS CONTINED OVER THE BATON ROUGE METROPOLITAN AREA... RADAR SHOWED THUNDERSTORMS FROM PORT BARRE THROUGH BATON ROUGE SOUTHEAST TO LAKE PONTCHARTRAIN. MOVEMENT WAS WEST AT 20 MPH. AS THESE THUNDERSTORMS MOVE THROUGH THE AREA...THEY WILL PRODUCE STRONG GUSTY WINDS...HEAVY RAINS...FREQUENT LIGHTNING WITH SOME SMALL HA5IL. THESE CONDITIONS SHOULD LAST UNTIL 10 PM TONIGHT.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 8:55 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Saint Charles, Saint John the Baptist | 65 min |
| Sep 4, 8:55 PM CDT | Severe Thunderstorm Warning | LIX | Tangipahoa | 65 min |
| Sep 4, 8:55 PM CDT | Severe Thunderstorm Warning | LIX | Orleans | 65 min |
| Sep 4, 9:34 PM CDT | Severe Thunderstorm Warning | LIX | Lafourche, Saint Charles, Saint John the Baptist | 56 min |
| Sep 4, 10:45 PM CDT | Severe Thunderstorm Warning | LIX | Iberia, Saint Martin, St. Mary | 105 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 1990Every severe thunderstorm warning in 1990
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.