Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 203, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Jul 12, 1997, 3:31 PM CDT for Saint Helena Parish, Louisiana. It was in force for 59 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
- Jul 12, 1997, 3:31 PM CDT (20:31 UTC)
- Expired
- Jul 12, 1997, 4:30 PM CDT
- In force
- 59 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
County Saint Helena Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 8.5 hours before the alert went out and 116 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
- 2495 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 766 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -46 m²/s²
- 0-3 km storm-relative helicity
- -20 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 12, 10:18 AM CDT, 5 hours 13 minutes before
LAZ034>040-046>049-056>070-MSZ068>071-080>082-121600- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA 1100 AM CDT SAT JUL 12 1997 AREA REMAINS UNDER A RIDGE OF HIGH PRESSURE. GOOD DIFLUENT FLOW ALOFT IS OVER THE AREA. DRIER AIR ALOFT IS MOVING WESTWARD INTO SOUTHEAST LOUISIANA. AIR MASS REMAINS UNSTABLE AND VERY MOIST. 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
Special weather statement, Jul 12, 11:00 AM CDT, 4 hours 31 minutes before
LAZ034>040-046>049-056>070-MSZ068>071-080>082-121600- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA 1100 AM CDT SAT JUL 12 1997 AREA REMAINS UNDER A RIDGE OF HIGH PRESSURE. GOOD DIFLUENT FLOW ALOFT IS OVER THE AREA. DRIER AIR ALOFT IS MOVING WESTWARD INTO SOUTHEAST LOUISIANA. AIR MASS REMAINS UNSTABLE AND VERY MOIST. 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
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 1:42 PM CDT | Severe Thunderstorm Warning | LIX | Saint Helena | 63 min |
| Jul 12, 2:10 PM CDT | Severe Thunderstorm Warning | LIX | Livingston | 65 min |
| Jul 12, 2:36 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany, Tangipahoa | 69 min |
| Jul 12, 2:54 PM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge | 66 min |
| Jul 12, 3:16 PM CDT | Severe Thunderstorm Warning | LIX | Terrebonne | 59 min |
| Jul 12, 4:09 PM CDT | Severe Thunderstorm Warning | LIX | Saint James, Saint John the Baptist | 36 min |
| Jul 12, 5:32 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Plaquemines | 28 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; the sounding from the Mesonet's radiosonde archive.