Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 226, NWS Twin Cities, MN

September 18, 1997Morrison County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 18, 1997, 5:13 PM CDT for Morrison County, Minnesota. It was in force for 32 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, 5:13 PM CDT (22:13 UTC)
Expired: Sep 18, 1997, 5:45 PM CDT
In force: 32 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Morrison County, MN

The radar

The Minneapolis radar (KMPX), 141 km from the middle of the area, began a volume at 21:59 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
Sep 18, 5:25 PM CDT	Tornado F1	Camp Ripley Jct, 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, 10.2 hours before the alert went out and 139 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.

214 
WUUS1 KMSP 182214 RRA
SVRMSP
MNC097-182245-

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


* SEVERE THUNDERSTORM WARNING FOR
  MORRISON COUNTY - CENTRAL MINNESOTA

* UNTIL 545 PM CDT

* SOME LOCATIONS AFFECTED
    FORT RIPLEY
    FREEDHEM
    HARDING

* AT 512 PM CDT DOPPLER RADAR INDICATED A SEVERE STORM WITH LARGE
  HAIL AND DAMAGING WINDS ABOUT 8 MILES NORTH OF LITTLE FALLS OR
  ABOUT 35 MILES NORTH OF  ST CLOUD.  THE STORM WAS MOVING
  NORTHEAST AT 40 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
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, 6:24 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec	66 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; radar from the NEXRAD Level II archive.