Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 120, NWS Twin Cities, MN

July 13, 1997Brown County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 13, 1997, 6:15 PM CDT for Brown County, Minnesota. It was in force for 45 min. 2 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 13, 1997, 6:15 PM CDT (23:15 UTC)
Expired: Jul 13, 1997, 7:00 PM CDT
In force: 45 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Brown County, MN

The radar

The Minneapolis radar (KMPX), 114 km from the middle of the area, began a volume at 23:15 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 13, 6:20 PM CDT	Hail 0.75	Springfield, MN
Jul 13, 6:20 PM CDT	Hail 1.75	New Ulm, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 13, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.3 hours before the alert went out and 300 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: 825 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1060 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

565 
WUUS1 KMSP 132317 RRA
SVRMSP
MNC015-140000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
615 PM CDT SUN JUL 13 1997

* SEVERE THUNDERSTORM WARNING FOR
  BROWN COUNTY - SOUTH CENTRAL MINNESOTA

* UNTIL 700 PM CDT
 

* SOME LOCATIONS AFFECTED
    SLEEPY EYE
    NEW ULM
    ESSIG

* AT 615 PM CDT DOPPLER RADAR INDICATED A SEVERE STORM WITH LARGE
  HAIL AND DAMAGING WINDS 15 MILES SOUTHWEST OF NEW ULM.  THE STORM
  WAS MOVING NORTHEAST AT 25 MPH.

DAMAGING WINDS AND LARGE HAIL ARE LIKELY.  GO INSIDE A STURDY
BUILDING AND STAY 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 13, 12:36 AM CDT	Severe Thunderstorm Warning	MPX	Chisago	39 min
Jul 13, 4:27 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Yellow Medicine	33 min
Jul 13, 5:00 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Yellow Medicine	45 min
Jul 13, 5:35 PM CDT	Severe Thunderstorm Warning	MPX	Watonwan	40 min
Jul 13, 6:01 PM CDT	Severe Thunderstorm Warning	MPX	Redwood	44 min
Jul 13, 6:19 PM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi	56 min
Jul 13, 6:43 PM CDT	Tornado Warning	MPX	Nicollet	47 min
Jul 13, 6:47 PM CDT	Severe Thunderstorm Warning	MPX	Meeker	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.