Alert archive / Louisiana / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 101, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at May 10, 1999, 12:53 PM CDT for Ascension Parish, Assumption Parish, Iberville Parish, Louisiana. It was in force for 62 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 10, 1999, 12:53 PM CDT (17:53 UTC)
- Expired
- May 10, 1999, 1:55 PM CDT
- In force
- 62 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
Counties Ascension Parish, LA, Assumption Parish, LA, Iberville Parish, LA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 10, 1:55 PM CDT | Thunderstorm Wind | Sorrento, LA | The Ascension Parish Department of Emergency management reported several trees blown down in the southeastern portion of the parish. |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 10, 11:45 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 5.9 hours before the alert went out and 136 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1570 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 141 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 10, 11:00 AM CDT, 1 hour 53 minutes before
LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-110100- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1100 AM CDT MON MAY 10 1999 A LINE OF STRONG TO SEVERE THUNDERSTORMS OVER CENTRAL AND SOUTHWEST LOUISIANA WAS MOVING EAST AT 30 MILES PER HOUR. THE THUNDERSTORMS WILL MOVE INTO SOUTHWEST MISSISSIPPI AND THE EAST CENTRAL AND SOUTHEAST LOUISIANA PARISHES FROM NEAR BATON ROUGE SOUTH TO HOUMA BETWEEN NOON AND 2 PM. WIND GUSTS OF 40 TO 50 MILES PER HOUR...BRIEF HEAVY RAIN AND HAIL ARE POSSIBLE WITH THIS LINE OF THUNDERSTORMS. DAMAGING WIND GUSTS AND LARGE HAIL SHOULD BE ISOLATED. THE AIRMASS FARTHER EAST FROM MCCOMB TO NEW ORLEANS AND EAST ACROSS THE MISSISSIPPI COASTAL COUNTIES WILL BE VERY UNSTABLE THIS AFTERNOON...BUT THERE WILL BE LESS MOISTURE AVAILABLE TO SUPPORT THE CURRENT INTENSITY OF THE THUNDERSTORMS. THE THUNDERSTORMS WILL MOVE INTO THIS AREA BETWEEN 2 AND 5 PM AND BECOME MORE SCATTERED AS THEY MO VE EAST. THUNDERSTORMS WILL DISSIPATE DURING THE EVENING HOURS. FOR MORE WEATHER INFORMATION...VISIT OUR HOMEPAGE AT HTTP://WWW.SRH.NOAA.GOV/LIX (ALL LOWER CASE) 22
Special weather statement, May 10, 11:40 AM CDT, 1 hour 13 minutes before
LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-110100- THUNDERSTORM OUTLOOK...CORRECTION NATIONAL WEATHER SERVICE NEW ORLEANS LA 1140 AM CDT MON MAY 10 1999 ...A FEW SEVERE THUNDERSTORMS ARE POSSIBLE IN EAST CENTRAL AND SOUTHEAST LOUISIANA THIS AFTERNOON... A LINE OF STRONG TO SEVERE THUNDERSTORMS OVER EAST CENTRAL AND SOUTH CENTRAL LOUISIANA WAS MOVING EAST AT 35 MILES PER HOUR. THE THUNDERSTORMS WILL MOVE INTO SOUTHWEST MISSISSIPPI AND THE EAST CENTRAL AND SOUTHEAST LOUISIANA PARISHES NEAR BATON ROUGE BETWEEN NOON AND 2 PM. DAMAGING WIND GUSTS OF 50 TO 60 MILES PER HOUR... BRIEF HEAVY RAIN AND HAIL ARE POSSIBLE WITH THIS LINE OF THUNDERSTORMS. THE AIRMASS FARTHER EAST FROM HAMMOND TO HOUMA TO NEW ORLEANS AND EAST ACROSS THE MISSISSIPPI COASTAL COUNTIES WILL BE VERY UNSTABLE THIS AFTERNOON...SO THE LINE OF THUNDERSTORMS WILL LIKELY MAINTAIN THEIR INTENSITY AS THEY MOVE EAST ACROSS THIS AREA BETWEEN 2 AND 4 PM. DRIER AIR FROM MCCOMB TO THE MISSISSIPPI COAST SHOULD CAUSE THE THUNDERSTORMS TO WEAKEN AS THEY MOVE ACROSS EXTREME SOUTH MISSISSIPPI. FOR MORE WEATHER INFORMATION...VISIT OUR HOMEPAGE AT HTTP://WWW.SRH.NOAA.GOV/LIX (ALL LOWER CASE) 22
Special weather statement, May 10, 11:40 AM CDT, 1 hour 13 minutes before
LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-110100- THUNDERSTORM OUTLOOK...CORRECTION NATIONAL WEATHER SERVICE NEW ORLEANS LA 1140 AM CDT MON MAY 10 1999 ...A FEW SEVERE THUNDERSTORMS ARE POSSIBLE IN EAST CENTRAL AND SOUTHEAST LOUISIANA THIS AFTERNOON... A LINE OF STRONG TO SEVERE THUNDERSTORMS OVER EAST CENTRAL AND SOUTH CENTRAL LOUISIANA WAS MOVING EAST AT 35 MILES PER HOUR. THE THUNDERSTORMS WILL MOVE INTO SOUTHWEST MISSISSIPPI AND THE EAST CENTRAL AND SOUTHEAST LOUISIANA PARISHES NEAR BATON ROUGE BETWEEN NOON AND 2 PM. DAMAGING WIND GUSTS OF 50 TO 60 MILES PER HOUR... BRIEF HEAVY RAIN AND HAIL ARE POSSIBLE WITH THIS LINE OF THUNDERSTORMS. THE AIRMASS FARTHER EAST FROM HAMMOND TO HOUMA TO NEW ORLEANS AND EAST ACROSS THE MISSISSIPPI COASTAL COUNTIES WILL BE VERY UNSTABLE THIS AFTERNOON...SO THE LINE OF THUNDERSTORMS WILL LIKELY MAINTAIN THEIR INTENSITY AS THEY MOVE EAST ACROSS THIS AREA BETWEEN 2 AND 4 PM. DRIER AIR FROM MCCOMB TO THE MISSISSIPPI COAST SHOULD CAUSE THE THUNDERSTORMS TO WEAKEN AS THEY MOVE ACROSS EXTREME SOUTH MISSISSIPPI. FOR MORE WEATHER INFORMATION...VISIT OUR HOMEPAGE AT HTTP://WWW.SRH.NOAA.GOV/LIX (ALL LOWER CASE) 22
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 11:37 AM CDT | Severe Thunderstorm Warning | LIX | Pointe Coupee, West Feliciana | 63 min |
| May 10, 11:58 AM CDT | Severe Thunderstorm Warning | LIX | Iberville, West Baton Rouge | 62 min |
| May 10, 12:33 PM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge | 62 min |
| May 10, 12:33 PM CDT | Severe Thunderstorm Warning | LIX | East Feliciana, West Feliciana | 62 min |
| May 10, 1:10 PM CDT | Severe Thunderstorm Warning | LIX | Livingston, Saint Helena | 65 min |
| May 10, 1:28 PM CDT | Severe Thunderstorm Warning | LIX | Saint James, Saint John the Baptist | 32 min |
| May 10, 1:47 PM CDT | Severe Thunderstorm Warning | LIX | Tangipahoa | 48 min |
| May 10, 1:56 PM CDT | Severe Thunderstorm Warning | LIX | Ascension | 34 min |
| May 10, 2:05 PM CDT | Severe Thunderstorm Warning | LIX | Saint James, Saint John the Baptist | 45 min |
| May 10, 2:26 PM CDT | Severe Thunderstorm Warning | LIX | Terrebonne | 49 min |
| May 10, 2:29 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany, Washington | 46 min |
| May 10, 2:32 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Orleans | 48 min |
| May 10, 2:35 PM CDT | Severe Thunderstorm Warning | LIX | Tangipahoa | 35 min |
| May 10, 2:41 PM CDT | Severe Thunderstorm Warning | LIX | Lafourche, Saint Charles | 49 min |
| May 10, 2:58 PM CDT | Severe Thunderstorm Warning | LIX | Plaquemines, Saint Bernard | 62 min |
| May 10, 3:04 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany, Washington | 51 min |
| May 10, 3:19 PM CDT | Tornado Warning | LIX | Jefferson, Saint Charles | 36 min |
| May 10, 3:26 PM CDT | Severe Thunderstorm Warning | LIX | Orleans | 49 min |
| May 10, 3:52 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson | 33 min |
| May 10, 3:59 PM CDT | Severe Thunderstorm Warning | LIX | Orleans, Plaquemines, Saint Bernard | 51 min |
| May 10, 1:10 PM CDT | Severe Thunderstorm Warning | LIX | Amite | 65 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.