Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 95, NWS Sioux Falls, SD

July 25, 1997Lincoln County, Pipestone County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 25, 1997, 11:42 PM CDT for Lincoln County, Pipestone County, Minnesota. It was in force for 33 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 25, 1997, 11:42 PM CDT (04:42 UTC)
Expired: Jul 26, 1997, 12:15 AM CDT
In force: 33 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

Counties Lincoln County, MN, Pipestone County, MN

The radar

The Sioux Falls radar (KFSD), 79 km from the middle of the area, began a volume at 04:44 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 25, 11:00 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 4.7 hours before the alert went out and 186 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3331 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1007 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KFSD 260444 RRA
SVRFSD
MNC081-117-260515-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1142 PM CDT FRI JUL 25 1997

* SEVERE THUNDERSTORM WARNING FOR
  SOUTHERN LINCOLN COUNTY IN SOUTHWESTERN MINNESOTA
  NORTHERN PIPESTONE COUNTY IN SOUTHWESTERN MINNESOTA

* UNTIL 1215 AM CDT
 
* SOME AREAS AFFECTED ARE
     RUTHTON AROUND 1205 AM
     HOLLAND AROUND 1205 AM.

* AT 1139 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM 14 MILES NORTH OF PIPESTONE  OR 5 MILES
  SOUTHEAST OF LAKE BENTON MOVING EAST AT 35 MPH.
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS .  DO NOT USE TELEPHONES OR
ELECTRICAL APPLIANCES UNTIL THE STORM HAS PASSED UNLESS IN AN
EMERGENCY.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

BLOOM

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.

NWS Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 25, 8:34 PM CDT, 3 hours 8 minutes earlier.

Area forecast discussion, Jul 25, 8:34 PM CDT, 3 hours 8 minutes before

SOUTH DAKOTA/NORTHWEST IOWA/SOUTHWEST MINNESOTA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SIOUX FALLS SD
834 PM CDT FRI JUL 25 1997

NEXRAD AT FSD SHOWS TSTMS OVR NERN SD MOVG SE TWD FORECAST AREA. THESE
TSTMS SHOULD REACH COUNTIES IN WATCH AND FORECAST AREA THIS EVE. NEXRAD
AT ABR ALSO SUPPPORTS THIS. TSTMS HAVE BEEN DVLPG ON PREVIOUS TSTM S
BOUND OUTFLOW BOUNDRIES.

NEXRAD AT FSD ALSO SHOWS TSTMS LONG RANGE OVR N CNTRL NE HAVE WEAKENED.
TSTMS OVR CNTRL NE MOVG SLOWLY NORTHEAST BUT PAST HOUR HAVE ALSO SHOWN
SIGNS OF WEAKENING. THESE APPEAR TO BE SEVERAL HOURS FROM FORECAST AREA
ATTM BUT MAY REACH FORECAST AREA AFTER MIDN.

MAY ISSUE UPDATE ON FORECAST FOR STRONGER WORDING ON TSTMS OVR NERN
PART OF FORECAST AREA.

.FSD...NONE

BLOOM

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 26, 12:14 AM CDT	Severe Thunderstorm Warning	FSD	Murray	46 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1997 Every 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; radar from the NEXRAD Level II archive.