Alert archive / Louisiana / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 148, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at May 30, 1999, 12:06 PM CDT for Saint Tammany Parish, Louisiana. It was in force for 44 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 30, 1999, 12:06 PM CDT (17:06 UTC)
- Expired
- May 30, 1999, 12:50 PM CDT
- In force
- 44 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
County Saint Tammany Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 5.1 hours before the alert went out and 30 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
- 744 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 865 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 74 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, May 30, 11:00 AM CDT, 1 hour 6 minutes before
LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-310000- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1100 AM CDT SUN MAY 30 1999 ...LOCALLY HEAVY RAINFALL IS EXPECTED THIS AFTERNOON AND TONIGHT... A STRONG UPPER LEVEL DISTURBANCE IS MOVING ACROSS LOUISIANA TODAY. AN ABUNDANT SUPPLY OF TROPICAL MOISTURE ACROSS THE AREA WILL MAKE TORRENTIAL RAINFALL A PRIMARY THREAT TODAY AND TONIGHT. THUNDERSTORMS WILL BE SCATTERED TO NUMEROUS THROUGHOUT THE DAY AND WILL BE MOVING GENERALLY NORTHEAST BETWEEN 10 AND 15 MPH. DEADLY LIGHTNING CAN BE EXPECTED WITH ALL THE STORMS TODAY AS WELL. SOME OF THE MORE STRONGER STORMS MAY ALSO BE CAPABLE OF PRODUCING WIND GUSTS OF 40 TO 50 MPH IN DOWNBURSTS AND SOME SMALL HAIL...PARTICULARLY THOSE THAT DEVELOP LATER THIS AFTERNOON. WATERSPOUTS WILL ALSO BE POSSIBLE OVER LARGE BODIES OF WATER. LOCAL RAINFALL FORECASTING METHODS SUGGEST RAINFALL AMOUNTS GENERALLY BETWEEN 2 AND 3 INCHES LIKELY WITH LOCALLY HIGHER AMOUNTS AROUND 5 INCHES POSSIBLE FROM SOME OF THE MORE PRONOUNCED STORMS. LOCALIZED STREET AND LOW-LYING AREA FLOODING CAN BE EXPECTED DURING PERIODS OF HEAVY RAINFALL. RESIDENTS...LOCAL LAW ENFORCEMENT AND EMERGENCY PREPAREDNESS PERSONNEL SHOULD MONITOR THE WEATHER SITUATION TODAY AND TONIGHT FOR POTENTIAL HEAVY RAIN AND FLOOD PROBLEMS THAT MAY ARISE. STAY TUNED FOR LATER STATEMENTS AND POSSIBLE WARNINGS THROUGHOUT THE DAY. FOR MORE WEATHER INFORMATION...VISIT OUR HOMEPAGE AT HTTP://WWW.SRH.NOAA.GOV/LIX (ALL LOWER CASE) 24
Special weather statement, May 30, 11:00 AM CDT, 1 hour 6 minutes before
LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-310000- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1100 AM CDT SUN MAY 30 1999 ...LOCALLY HEAVY RAINFALL IS EXPECTED THIS AFTERNOON AND TONIGHT... A STRONG UPPER LEVEL DISTURBANCE IS MOVING ACROSS LOUISIANA TODAY. AN ABUNDANT SUPPLY OF TROPICAL MOISTURE ACROSS THE AREA WILL MAKE TORRENTIAL RAINFALL A PRIMARY THREAT TODAY AND TONIGHT. THUNDERSTORMS WILL BE SCATTERED TO NUMEROUS THROUGHOUT THE DAY AND WILL BE MOVING GENERALLY NORTHEAST BETWEEN 10 AND 15 MPH. DEADLY LIGHTNING CAN BE EXPECTED WITH ALL THE STORMS TODAY AS WELL. SOME OF THE MORE STRONGER STORMS MAY ALSO BE CAPABLE OF PRODUCING WIND GUSTS OF 40 TO 50 MPH IN DOWNBURSTS AND SOME SMALL HAIL...PARTICULARLY THOSE THAT DEVELOP LATER THIS AFTERNOON. WATERSPOUTS WILL ALSO BE POSSIBLE OVER LARGE BODIES OF WATER. LOCAL RAINFALL FORECASTING METHODS SUGGEST RAINFALL AMOUNTS GENERALLY BETWEEN 2 AND 3 INCHES LIKELY WITH LOCALLY HIGHER AMOUNTS AROUND 5 INCHES POSSIBLE FROM SOME OF THE MORE PRONOUNCED STORMS. LOCALIZED STREET AND LOW-LYING AREA FLOODING CAN BE EXPECTED DURING PERIODS OF HEAVY RAINFALL. RESIDENTS...LOCAL LAW ENFORCEMENT AND EMERGENCY PREPAREDNESS PERSONNEL SHOULD MONITOR THE WEATHER SITUATION TODAY AND TONIGHT FOR POTENTIAL HEAVY RAIN AND FLOOD PROBLEMS THAT MAY ARISE. STAY TUNED FOR LATER STATEMENTS AND POSSIBLE WARNINGS THROUGHOUT THE DAY. FOR MORE WEATHER INFORMATION...VISIT OUR HOMEPAGE AT HTTP://WWW.SRH.NOAA.GOV/LIX (ALL LOWER CASE) 24
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 8:57 AM CDT | Severe Thunderstorm Warning | LIX | Tangipahoa | 33 min |
| May 30, 12:51 PM CDT | Tornado Warning | LIX | Iberville, West Baton Rouge | 34 min |
| May 30, 3:31 PM CDT | Tornado Warning | LIX | Terrebonne | 29 min |
| May 30, 3:40 PM CDT | Severe Thunderstorm Warning | LIX | Pointe Coupee | 35 min |
| May 30, 5:07 PM CDT | Severe Thunderstorm Warning | LIX | Iberville | 33 min |
| May 30, 11:55 AM CDT | Tornado Warning | LIX | Pearl River | 30 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 1999Every severe thunderstorm warning in 1999
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.