Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 171, NWS Twin Cities, MN

July 25, 1997Le Sueur County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 25, 1997, 3:16 AM CDT for Le Sueur County, Minnesota. It was in force for 44 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, 3:16 AM CDT (08:16 UTC)
Expired: Jul 25, 1997, 4:00 AM CDT
In force: 44 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Le Sueur County, MN

The radar

The Minneapolis radar (KMPX), 55 km from the middle of the area, began a volume at 08:16 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 8.3 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 250816 RRA
SVRMSP
MNC079-250900-

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

* SEVERE THUNDERSTORM WARNING FOR
  LE SUEUR COUNTY - SOUTH CENTRAL MINNESOTA

* UNTIL 400 AM CDT
 
* SOME LOCATIONS AFFECTED
    LE SUEUR
    LE CENTER
    LONSDALE
    MONTGOMERY

* AT 315 AM CDT DOPPLER RADAR INDICATED SEVERE STORMS WITH
  DAMAGING WINDS FROM BELLE PLAINE TO N EW ULM.  THE STORMS WERE
  MOVING SOUTHEAST AT 50 MPH.

THESE ARE DANGEROUS STORMS.  STAY INDOORS AWAY FROM WINDOWS.


HAMEN

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, 2:28 AM CDT	Severe Thunderstorm Warning	MPX	McLeod, Sibley	62 min
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, 3:49 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.