Alert archive / North Dakota / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 641

July 23, 199728 counties in North Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 23, 1997, 5:00 PM MDT for 28 counties in North Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 23, 1997, 5:00 PM MDT (23:00 UTC)
Expired
Jul 23, 1997, 11:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center
All 28 counties

Adams County, ND, Billings County, ND, Bottineau County, ND, Bowman County, ND, Burke County, ND, Burleigh County, ND, Divide County, ND, Dunn County, ND, Emmons County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Pierce County, ND, Renville County, ND, Rolette County, ND, Sheridan County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Ward County, ND, Williams County, ND

The radar

The Bismarck radar (KBIS), 129 km from the middle of the area, began a volume at 23:04 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

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

IssuedProductOfficeCountiesLasted
Jul 23, 5:37 PM MDTSevere Thunderstorm WarningBISRenville68 min
Jul 23, 6:20 PM MDTSevere Thunderstorm WarningBISMountrail55 min
Jul 23, 6:36 PM MDTTornado WarningBISRenville39 min
Jul 23, 7:15 PM MDTSevere Thunderstorm WarningBISMountrail60 min
Jul 23, 7:18 PM MDTSevere Thunderstorm WarningBISWard42 min
Jul 23, 7:18 PM MDTTornado WarningBISRenville, Ward42 min
Jul 23, 7:30 PM MDTSevere Thunderstorm WarningBISMcHenry60 min
Jul 23, 8:00 PM MDTSevere Thunderstorm WarningBISWard30 min
Jul 23, 8:26 PM MDTSevere Thunderstorm WarningBISMcHenry64 min
Jul 23, 9:02 PM MDTSevere Thunderstorm WarningBISPierce58 min

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 11.0 hours before the alert went out and 134 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, Bismarck Municip, ND at 12:00Z on 1997-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1164 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, Bismarck Municip, ND at 12:00Z on 1997-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 square meters per square second.193958Sfc1 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
1164 J/kg
Mixed-layer CIN
-197 J/kg
Mixed-layer LCL
600 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
144 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

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 North 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.