Alert archive / Louisiana / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 149, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at May 30, 1999, 3:40 PM CDT for Pointe Coupee Parish, Louisiana. It was in force for 35 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 30, 1999, 3:40 PM CDT (20:40 UTC)
- Expired
- May 30, 1999, 4:15 PM CDT
- In force
- 35 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
County Pointe Coupee Parish, LA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 30, 4:05 PM CDT | Thunderstorm Wind | Lettsworth, LA | The Pointe Coupee Sheriff's Office reported a few trees down along Louisiana Highway 1. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 8.7 hours before the alert went out and 189 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, 4 hours 40 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, 4 hours 40 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
Local storm report, May 30, 12:33 PM CDT, 3 hours 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OFFICE NEW ORLEANS LOUISIANA
1233 PM CDT THU MAY 30 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....PARISH LOCATION....
1209 PM SILVER RUN MS TORNADO
05/30/99 PEARL RIVER SIGHTED BY FIRE DEPT AND
RELAYED BY PEARL RIVER
S.O. ABOUT 8 MILES WEST OF
SILVER RUN EAST OF HIGHWAY
53.
1055 AM NORTH SHORE LA NON QUALIFIED EVENT
05/30/99 ST TAMMANY 2 WATERSPOUTS NEAR HIGHWAY
11 BRIDGE SOUTH OF EDEN
ISLES. ONE SPOUT CROSSED
THE SPAN AS REPORTED BY
CAUSEWAY POLICE AND TV MET.Local storm report, May 30, 12:33 PM CDT, 3 hours 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OFFICE NEW ORLEANS LOUISIANA
1233 PM CDT THU MAY 30 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....PARISH LOCATION....
1209 PM SILVER RUN MS TORNADO
05/30/99 PEARL RIVER SIGHTED BY FIRE DEPT AND
RELAYED BY PEARL RIVER
S.O. ABOUT 8 MILES WEST OF
SILVER RUN EAST OF HIGHWAY
53.
1055 AM NORTH SHORE LA NON QUALIFIED EVENT
05/30/99 ST TAMMANY 2 WATERSPOUTS NEAR HIGHWAY
11 BRIDGE SOUTH OF EDEN
ISLES. ONE SPOUT CROSSED
THE SPAN AS REPORTED BY
CAUSEWAY POLICE AND TV MET.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, 12:06 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany | 44 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, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.