Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 168, NWS Twin Cities, MN

July 25, 1997McLeod County, Sibley County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 25, 1997, 2:28 AM CDT for McLeod County, Sibley County, Minnesota. It was in force for 62 min. 4 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 25, 1997, 2:28 AM CDT (07:28 UTC)
Expired: Jul 25, 1997, 3:30 AM CDT
In force: 62 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties McLeod County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 57 km from the middle of the area, began a volume at 07:30 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.

What was reported inside it

Time	Report	Where	Remark
Jul 25, 2:40 AM CDT	Thunderstorm Wind 50	Gaylord, MN	Garage blown down. Garage was under construction. Estimated windspeed.
Jul 25, 2:54 AM CDT	Thunderstorm Wind 55	Brownton, MN	Trees blown down. Estimated windspeed.
Jul 25, 2:57 AM CDT	Tornado F0	Brownton, MN	Tree damage.
Jul 25, 3:00 AM CDT	Thunderstorm Wind 50	Glencoe, MN	Shed damaged. Estimated windspeed.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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 24, 10:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 7.5 hours before the alert went out and 54 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: 870 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 783 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 250728 RRA
SVRMSP
MNC085-143-250830-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
228 AM CDT FRI JUL 25 1997

* SEVERE THUNDERSTORM WARNING FOR
  MCLEOD COUNTY - CENTRAL MINNESOTA
  SIBLEY COUNTY - SOUTH CENTRAL MINNESOTA

* UNTIL 330 AM CDT
 
* SOME LOCATIONS AFFECTED
    HUTCHINSON
    STEWART
    GIBBON
    WINTHROP

* AT 230 AM CDT DOPPLER RADAR INDICATED A LINE OF SEVERE STORMS0
  FROM 15 MILES WEST OF HUTCHINSON TO 10 MILES EAST OF REDWOOD
  FALLS.  THE STORMS WERE MOVING EAST AT 35 MPH.

THIS IS A DANGEROUS STORM...WITH DAMAGING WINDS.  STAY INDOORS AWAY
FROM WINDOWS.


TOGSTAD

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 25, 1:01 AM CDT	Severe Thunderstorm Warning	MPX	Yellow Medicine	49 min
Jul 25, 1:33 AM CDT	Tornado Warning	MPX	Yellow Medicine	32 min
Jul 25, 2:04 AM CDT	Severe Thunderstorm Warning	MPX	Renville	46 min
Jul 25, 2:07 AM CDT	Severe Thunderstorm Warning	MPX	Redwood	48 min
Jul 25, 2:23 AM CDT	Tornado Warning	MPX	Renville	32 min
Jul 25, 2:26 AM CDT	Flash Flood Warning	MPX	Blue Earth, Faribault, Freeborn, Le Sueur, Steele, Waseca	4 hr
Jul 25, 2:26 AM CDT	Flash Flood Warning	MPX	Brown, Nicollet, Redwood, Renville, Sibley	4 hr
Jul 25, 2:26 AM CDT	Flash Flood Warning	MPX	Martin, Watonwan	4 hr
Jul 25, 2:34 AM CDT	Severe Thunderstorm Warning	MPX	Brown, Nicollet	61 min
Jul 25, 2:56 AM CDT	Tornado Warning	MPX	McLeod	34 min
Jul 25, 3:03 AM CDT	Severe Thunderstorm Warning	MPX	Carver, Scott	47 min
Jul 25, 3:16 AM CDT	Severe Thunderstorm Warning	MPX	Le Sueur	44 min
Jul 25, 3:49 AM CDT	Severe Thunderstorm Warning	MPX	Rice	46 min
Jul 25, 4:15 AM CDT	Flash Flood Warning	MPX	Dakota, Goodhue, Rice, Scott	4 hr

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.