Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 110, NWS Twin Cities, MN

July 5, 1997Blue Earth County, Waseca County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 5, 1997, 5:31 PM CDT for Blue Earth County, Waseca County, Minnesota. It was in force for 44 min. 1 report 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 5, 1997, 5:31 PM CDT (22:31 UTC)
Expired: Jul 5, 1997, 6:15 PM CDT
In force: 44 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Blue Earth County, MN, Waseca County, MN

The radar

The Minneapolis radar (KMPX), 94 km from the middle of the area, began a volume at 22:34 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 5, 5:57 PM CDT	Hail 0.75	New Richland, MN

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 nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.5 hours before the alert went out and 93 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1610 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 71 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 052233 RRA
SVRMSP
MNC013-161-052315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
531 PM CDT SAT JUL 5 1997

* SEVERE THUNDERSTORM WARNING FOR
  EASTERN BLUE EARTH COUNTY - SOUTH CENTRAL MINNESOTA
  WASECA COUNTY - SOUTH CENTRAL MINNESOTA

* UNTIL 615 PM CDT
 
* SOME LOCATIONS AFFECTED
    ST CLAIR
    JANESVILLE
    PEMBERTON
    ALMA CITY

* AT 530 PM CDT DOPPLER RADAR INDICATED A 
SEVERE STORM WITH LARGE
  HAIL NEAR ST CLAIR...OR ABOUT 10 MILES SOUTHEAST OF MANKATO.  THE
  STORM WAS MOVING SOUTHEAST AT 25 MPH.

THIS IS A DANGEROUS STORM...WITH LARGE HAIL.  STAY INDOORS AWAY
FROM WINDOWS.


MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 3:47 PM CDT	Severe Thunderstorm Warning	MPX	Sibley	43 min
Jul 5, 4:14 PM CDT	Severe Thunderstorm Warning	MPX	Nicollet	31 min
Jul 5, 4:52 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Nicollet	38 min
Jul 5, 6:07 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn	53 min
Jul 5, 6:16 PM CDT	Severe Thunderstorm Warning	MPX	Waseca	29 min
Jul 5, 6:17 PM CDT	Severe Thunderstorm Warning	MPX	Chisago	58 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.