Alert archive / Nebraska / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 722

September 6, 199716 counties in Nebraska; 13 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Sep 6, 1997, 4:00 PM MDT for 16 counties in Nebraska; 13 counties in South Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Sep 6, 1997, 4:00 PM MDT (22:00 UTC)
Expired
Sep 6, 1997, 10:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center
All 29 counties

Arthur County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Holt County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Rock County, NE, Thomas County, NE, Aurora County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Jerauld County, SD, Lyman County, SD, Mellette County, SD, Sanborn County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 35 km from the middle of the area, began a volume at 22:00 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

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

IssuedProductOfficeCountiesLasted
Sep 6, 4:16 PM MDTSevere Thunderstorm WarningLBFCherry64 min
Sep 6, 4:26 PM MDTSevere Thunderstorm WarningUNRMellette59 min
Sep 6, 4:53 PM MDTSevere Thunderstorm WarningLBFCherry62 min
Sep 6, 5:53 PM MDTSevere Thunderstorm WarningLBFCherry62 min
Sep 6, 6:38 PM MDTSevere Thunderstorm WarningLBFBrown, Keya Paha62 min
Sep 6, 7:31 PM MDTSevere Thunderstorm WarningLBFMcPherson49 min

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.0 hours before the alert went out and 126 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, N. Platte/Lee Bi, NE at 12:00Z on 1997-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 962 joules per kilogram.LCLLFCEL10008507005003002001001 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, N. Platte/Lee Bi, NE at 12:00Z on 1997-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.19395878Sfc1 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
962 J/kg
Mixed-layer CIN
-129 J/kg
Mixed-layer LCL
1259 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
80 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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.

Nearby

Severe Thunderstorm Watches in Nebraska, 1997Severe Thunderstorm Watches in South Dakota, 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.