Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 221, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Jul 13, 1997, 4:17 PM CDT for Lafourche Parish, Terrebonne Parish, Louisiana. It was in force for 43 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
- Jul 13, 1997, 4:17 PM CDT (21:17 UTC)
- Expired
- Jul 13, 1997, 5:00 PM CDT
- In force
- 43 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
Counties Lafourche Parish, LA, Terrebonne Parish, LA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 13, 4:35 PM CDT | Thunderstorm Wind | Houma, LA | Sheriffs Office reported 60 mph wind gusts near the Terrebonne-Lafourche Parish border. |
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, 9.3 hours before the alert went out and 128 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
- 1858 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1023 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 2 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, Jul 13, 11:00 AM CDT, 5 hours 17 minutes before
LAZ034>040-046>049-056>070-MSZ068>071-080>082-141600- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA 1100 AM CDT SUN JUL 13 1997 AREA REMAINS UNDER A RIDGE OF HIGH PRESSURE. GOOD DIFLUENT FLOW ALOFT IS OVER THE AREA. AIR MASS HAS BECOME MORE UNSTABLE. WEAK IMPULSES MOVING SOUTH DOWN THE BACK SIDE OF THE HIGH WILL ENHANCE CONVECTION. EXPECT THUNDERSTORMS TO BEGIN TO FIRE EARLY IN THE AFTERNOON. A FEW COULD REACH SEVERE LIMITS WITH WINDS AROUND 60 MPH AND SMALL HAIL. THE ACTIVITY SHOULD BEGIN TO DECREASE DURING THE LATE AFTERNOON EARLY EVENING HOURS. MOVEMENT OF STORMS WILL GENERALLY BE SOUTHERLY AT 10 MPH OR LESS. THIS COULD RESULT IN LOCALLY HEAVY RAINFALL UNDER THE HEAVIER STORMS.
Special weather statement, Jul 13, 12:25 PM CDT, 3 hours 52 minutes before
LAZ034>040-046>049-056>070-MSZ068>071-080>082-141600- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA 1100 AM CDT SUN JUL 13 1997 AREA REMAINS UNDER A RIDGE OF HIGH PRESSURE. GOOD DIFLUENT FLOW ALOFT IS OVER THE AREA. AIR MASS HAS BECOME MORE UNSTABLE. WEAK IMPULSES MOVING SOUTH DOWN THE BACK SIDE OF THE HIGH WILL ENHANCE CONVECTION. EXPECT THUNDERSTORMS TO BEGIN TO FIRE EARLY IN THE AFTERNOON. A FEW COULD REACH SEVERE LIMITS WITH WINDS AROUND 60 MPH AND SMALL HAIL. THE ACTIVITY SHOULD BEGIN TO DECREASE DURING THE LATE AFTERNOON EARLY EVENING HOURS. MOVEMENT OF STORMS WILL GENERALLY BE SOUTHERLY AT 10 MPH OR LESS. THIS COULD RESULT IN LOCALLY HEAVY RAINFALL UNDER THE HEAVIER STORMS.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 12:44 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Plaquemines | 61 min |
| Jul 13, 1:11 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany | 64 min |
| Jul 13, 1:48 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Lafourche, Plaquemines | 57 min |
| Jul 13, 2:20 PM CDT | Severe Thunderstorm Warning | LIX | Tangipahoa | 55 min |
| Jul 13, 2:53 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Plaquemines | 67 min |
| Jul 13, 3:11 PM CDT | Severe Thunderstorm Warning | LIX | Washington | 64 min |
| Jul 13, 3:22 PM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge | 68 min |
| Jul 13, 3:45 PM CDT | Severe Thunderstorm Warning | LIX | Tangipahoa | 60 min |
| Jul 13, 4:08 PM CDT | Severe Thunderstorm Warning | LIX | Ascension, Livingston | 52 min |
| Jul 13, 4:23 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany | 52 min |
| Jul 13, 4:58 PM CDT | Severe Thunderstorm Warning | LIX | Iberville | 47 min |
| Jul 13, 5:10 PM CDT | Severe Thunderstorm Warning | LIX | Pointe Coupee, West Feliciana | 50 min |
| Jul 13, 5:27 PM CDT | Severe Thunderstorm Warning | LIX | Tangipahoa, Washington | 48 min |
| Jul 13, 12:58 PM CDT | Severe Thunderstorm Warning | LIX | Jackson | 62 min |
| Jul 13, 1:57 PM CDT | Severe Thunderstorm Warning | LIX | Jackson | 63 min |
| Jul 13, 3:53 PM CDT | Severe Thunderstorm Warning | LIX | Wilkinson | 67 min |
| Jul 13, 4:32 PM CDT | Severe Thunderstorm Warning | LIX | Amite | 43 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 1997Every severe thunderstorm warning in 1997
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.