Alert archive / Louisiana / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 4

January 4, 199722 parishes in Louisiana; 10 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Jan 4, 1997, 8:30 PM CST for 22 parishes in Louisiana; 10 counties in Mississippi. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jan 4, 1997, 8:30 PM CST (02:30 UTC)
Expired
Jan 5, 1997, 2:00 AM CST
In force
6 hr
Issued by
the Storm Prediction Center
All 32 counties

Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Issaquena County, MS, Jefferson County, MS, Sharkey County, MS, Warren County, MS, Yazoo County, MS

The radar

The Ft Polk radar (KPOE), 126 km from the middle of the area, began a volume at 02:33 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Warnings issued inside it

3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jan 4, 8:39 PM CSTSevere Thunderstorm WarningSHVJackson51 min
Jan 4, 8:49 PM CSTSevere Thunderstorm WarningSHVOuachita, Union41 min
Jan 4, 9:40 PM CSTSevere Thunderstorm WarningJANMorehouse, Richland50 min

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 2.5 hours before the alert went out and 157 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.

Skew-T log-pSkew-T log-p diagram, Shreveport, LA at 00:00Z on 1997-01-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1596 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 00:00Z on 1997-01-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 104 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1596 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1208 m above ground
0-6 km bulk shear
78 kt
0-1 km storm-relative helicity
104 m²/s²
0-3 km storm-relative helicity
76 m²/s²
Significant tornado parameter
0.6
Supercell composite
2.6

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 4, 8:15 PM CSTSevere Thunderstorm WatchSPCAlcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 25 more6 hr
Jan 4, 11:15 PM CSTSevere Thunderstorm WatchSPCAttala, Choctaw, Clay, Hinds, Kemper, Lauderdale and 11 more5 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 1997Severe Thunderstorm Watches in Mississippi, 1997Every severe thunderstorm watch 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; radar from the NEXRAD Level II archive.