Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 192, NWS Twin Cities, MN

August 4, 1997Hennepin County, Wright County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 4, 1997, 12:34 AM CDT for Hennepin County, Wright County, Minnesota. It was in force for 41 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: Aug 4, 1997, 12:34 AM CDT (05:34 UTC)
Expired: Aug 4, 1997, 1:15 AM CDT
In force: 41 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Hennepin County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 29 km from the middle of the area, began a volume at 05:36 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
Aug 4, 12:38 AM CDT	Thunderstorm Wind 50	Rogers, MN	Trees blown down. Estimated windspeed.

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 00:00Z, 5.6 hours before the alert went out and 28 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: 1028 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1282 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 040536 RRA
SVRMSP
MNC053-171-040615-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1234 AM CDT MON AUG 4 1997

* SEVERE THUNDERSTORM WARNING FOR
  HENNEPIN COUNTY - EAST CENTRAL MINNESOTA
  EASTERN WRIGHT COUNTY - CENTRAL MINNESOTA

* UNTIL 115 AM CDT
 
* SOME LOCATIONS AFFECTED
    ROGERS
    EXCELSIOR
    ST. MICHAEL
    LORETTO

* AT 1232 AM CDT DOPPLER RADAR INDICATED A SEVERE STORM WITH LARGE
  HAIL AND DAMAGING WINDS NEAR ALBERTVILLE OR ABOUT 25 MILES
  NORTHWEST OF MINNEAPOLIS.  THE STORM WAS MOVING SOUTH AT 35 MPH.

DAMAGING WINDS AND LARGE HAIL ARE LIKELY.  GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS.


MBK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 9:36 PM CDT	Severe Thunderstorm Warning	MPX	Todd	64 min
Aug 3, 9:51 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec	59 min
Aug 3, 11:22 PM CDT	Severe Thunderstorm Warning	MPX	Stearns, Todd	63 min
Aug 4, 12:01 AM CDT	Severe Thunderstorm Warning	MPX	Sherburne	34 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.