Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 228, NWS Twin Cities, MN

September 18, 1997Kanabec County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 18, 1997, 6:24 PM CDT for Kanabec County, Minnesota. It was in force for 66 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: Sep 18, 1997, 6:24 PM CDT (23:24 UTC)
Expired: Sep 18, 1997, 7:30 PM CDT
In force: 66 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Kanabec County, MN

What was reported inside it

Time	Report	Where	Remark
Sep 18, 7:03 PM CDT	Tornado F2	Woodland, MN	2 homes severely damaged. Large barn destroyed. Numerous trees and power lines down.

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
Sep 18, 5:30 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.4 hours before the alert went out and 124 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: 228 J/kg
Mixed-layer CIN: -404 J/kg
Mixed-layer LCL: 1391 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 477 m²/s²
0-3 km storm-relative helicity: 490 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 182327 RRA
SVRMSP
MNC065-190030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
624 PM CDT THU SEP 18 1997


* SEVERE THUNDERSTORM WARNING FOR
  NORTHERN KANABEC COUNTY - EAST CENTRAL MINNESOTA

* UNTIL 730 PM CDT

* SOME LOCATIONS AFFECTED
    WOODLAND
    WARMAN
    KROSCHELL
    SNAKE RIVER STATE FOREST

* AT 624 PM CDT DOPPLER RADAR INDICATED A SEVERE STORM WITH LARGE
  HAIL AND DAMAGING WINDS FROM JUST EAST OF ONAMIA...TO 10 MILES
  WEST OF ONAMIA.  THIS IS  ABOUT 25 TO 30 MILES SOUTHEAST OF
  BRAINERD.  THE STORM WAS MOVING EAST AT 30 MPH.

DAMAGING WINDS AND LARGE HAIL ARE LIKELY.  GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS.  A TORNADO WATCH IS IN EFFECT.
SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES.

TDK

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 18, 5:13 PM CDT	Severe Thunderstorm Warning	MPX	Morrison	32 min
Sep 18, 5:24 PM CDT	Tornado Warning	MPX	Morrison	51 min
Sep 18, 5:53 PM CDT	Severe Thunderstorm Warning	MPX	Mille Lacs	67 min
Sep 18, 6:04 PM CDT	Tornado Warning	MPX	Douglas, Todd	26 min
Sep 18, 6:08 PM CDT	Tornado Warning	MPX	Mille Lacs, Morrison	52 min
Sep 18, 6:30 PM CDT	Tornado Warning	MPX	Kanabec	60 min
Sep 18, 6:34 PM CDT	Tornado Warning	MPX	Morrison, Todd	41 min
Sep 18, 6:57 PM CDT	Tornado Warning	MPX	Mille Lacs	33 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.