Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 143, NWS Twin Cities, MN

July 17, 1997Pepin County, Pierce County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 17, 1997, 12:23 AM CDT for Pepin County, Pierce County, Wisconsin. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 17, 1997, 12:23 AM CDT (05:23 UTC)
Expired
Jul 17, 1997, 1:30 AM CDT
In force
67 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Pepin County, WI, Pierce County, WI

The radar

The Minneapolis radar (KMPX), 105 km from the middle of the area, began a volume at 05:26 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 5.4 hours before the alert went out and 107 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 1997-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2132 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 1997-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2132 J/kg
Mixed-layer CIN
-110 J/kg
Mixed-layer LCL
1981 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 170526 RRA
SVRMSP
WIC091-093-170630-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1223 AM CDT THU JUL 17 1997

* SEVERE THUNDERSTORM WARNING FOR
  PEPIN COUNTY - WEST CENTRAL WISCONSIN
  SOUTHERN PIERCE COUNTY - WEST CENTRAL WISCONSIN

* UNTIL 130 AM CDT
 
* SOME LOCATIONS AFFECTED
    MAIDEN ROCK
    STOCKHOLM
    DURAND
    ARKANSAW

* AT 1223 AM CDT DOPPLER RADAR INDICATED A SEVERE STORM WITH LARGE
  HAIL 10 TO 15 MILES EAST OF RED WING...OR NEAR MAIDEN ROCK.  THE
  STORM WAS MOVING SOUTHEAST AT 5 MPH.  ANOTHER STRONG STORM WAS
  NEAR RED WING...AND IT MIGHT ALSO STRENGTHEN TO SEVERE
  LEVELS AS IT CROSSES OVER TO BAY CITY |WISCONSIN.

  LARGE HAIL WAS REPORTED BY THE PUBLIC IN MAIDEN ROCK AT 1155 PM...
  THOUGH NO SIZE WAS GIVEN.

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

TDK
 

&

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 16, 6:35 PM CDT, 5 hours 48 minutes before
WIZ014>016-025-027-028-170030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHANHASSEN/TWIN CITIES MN
635 PM CDT WED JUL 16 1997

SEVERE THUNDERSTORM WATCH NUMBER 612 HAS BEEN CANCELLED FOR WEST
CENTRAL WISCONSIN.  THUNDERSTORMS MAY AGAIN DEVELOP LATER TONIGHT
ACROSS THE REGION.
Special weather statement, Jul 16, 6:42 PM CDT, 5 hours 41 minutes before
WIZ014>016-025-027-028-170030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHANHASSEN/TWIN CITIES MN
635 PM CDT WED JUL 16 1997

SEVERE THUNDERSTORM WATCH NUMBER 612 HAS BEEN CANCELLED FOR WEST
CE>NTRAL WISCONSIN.  THUNDERSTORMS MAY AGAIN DEVELOP LATER TONIGHT
ACROSS THE REGION.
Special weather statement, Jul 16, 7:20 PM CDT, 5 hours 3 minutes before
MNZ074>078-082>085-091>093-170130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHANHASSEN/TWIN CITIES MN
720 PM CDT WED JUL 16 1997

...TORNADO WATCH CANCELLED FOR SOUTH CENTRAL MINNESOTA...

TORNADO WATCH NUMBER 614 HAS BEEN CANCELLED FOR A PORTION OF SOUTH
CENTRAL MINNESOTA.  THUNDERSTORMS MAY DEVELOP LATER TONIGHT...SOME
OF WHICH COULD BE SEVERE.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 11:33 PM CDTSevere Thunderstorm WarningMPXPierce57 min
Jul 17, 2:55 AM CDTSevere Thunderstorm WarningMPXPierce65 min
Jul 17, 2:55 AM CDTSevere Thunderstorm WarningMPXSaint Croix65 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 1997Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.