Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 59, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Aug 30, 1990, 6:48 PM CDT for 4 parishes in Louisiana. It was in force for 57 min.
The area
The counties it named.
The facts
- Issued
- Aug 30, 1990, 6:48 PM CDT (23:48 UTC)
- Expired
- Aug 30, 1990, 7:45 PM CDT
- In force
- 57 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
Counties Jefferson Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard 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 12:00Z, 11.8 hours before the alert went out and 55 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
- 2438 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 889 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, Aug 30, 3:44 PM CDT, 3 hours 4 minutes before
LAZ008>010-012>014-MSZ010>014-ALZ016-302200- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE NEW ORLEANS LA 340 PM CDT THU AUG 30 1990 ...SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM CDT FOR ALL OF SOUTHEAST LOUISIANA... SCATTERED THUNDERSTORMS CONTINUED TO DEVELOP ACROSS SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI FROM BETWEEN HAMMOND AND MCCOMB EAST BETWEEN POPLARVILLE AND LAUREL AND CONTINUED EAST INTO SOUTHWEST ALABAM#A. THE STRONGEST THUNDERSTORMS WERE LOCATED BETWEEN BOGALUSA LOUISIANA AND HATTIESBURG MISSISSIPPI AND EXTENDED EAST TO THE MOBILE AREA. MOVEMENT WAS SOUTHEAST AT 20 MILES AN HOUR.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 2:28 PM CDT | Severe Thunderstorm Warning | LIX | Catahoula, Concordia | 62 min |
| Aug 30, 3:16 PM CDT | Severe Thunderstorm Warning | LIX | Avoyelles | 59 min |
| Aug 30, 4:01 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany | 59 min |
| Aug 30, 4:58 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany | 47 min |
| Aug 30, 5:46 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany | 29 min |
| Aug 30, 6:02 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Orleans, Saint Bernard | 58 min |
| Aug 30, 6:15 PM CDT | Severe Thunderstorm Warning | LIX | Tangipahoa | 60 min |
| Aug 30, 6:48 PM CDT | Severe Thunderstorm Warning | LIX | Saint Charles | 57 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.