Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 200, NWS Twin Cities, MN

August 15, 1997Mille Lacs County, Sherburne County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 15, 1997, 5:41 PM CDT for Mille Lacs County, Sherburne County, Minnesota. It was in force for 34 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: Aug 15, 1997, 5:41 PM CDT (22:41 UTC)
Expired: Aug 15, 1997, 6:15 PM CDT
In force: 34 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Mille Lacs County, MN, Sherburne County, MN

The radar

The Minneapolis radar (KMPX), 94 km from the middle of the area, began a volume at 22:45 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 watch it was issued in

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

Issued	Product	Office	Lasted
Aug 15, 4:15 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.7 hours before the alert went out and 94 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: 738 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 698 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 152243 RRA
SVRMSP
MNC095-141-152315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
541 PM CDT FRI AUG 15 1997


* SEVERE THUNDERSTORM WARNING FOR
  SOUTHERN MILLE LACS COUNTY - CENTRAL MINNESOTA
  EASTERN SHERBURNE COUNTY - CENTRAL MINNESOTA

* UNTIL 615 PM CDT

* SOME LOCATIONS AFFECTED
    PRINCETON
    ELK RIVER
    ZIMMERMAN

* AT 540 PM CDT AN OFF DUTY WEATHER SERVICE FORECASTER REPORTED A
  SEVERE STORM WITH DIME SIZED HAIL AND 55 MPH WINDS IN PRINCETON.
  RADAR ALSO SHOWED A LINE OF SEVERE STORMS WITH LARGE HAIL AND
  DAMAGING WINDS FROM ELK RIVER TO PRINCETON... OR FROM ABOUT 20
  MILES SOUTHWEST OF CAMBRIDGE...TO 10 MILES WEST OF CAMBRIDGE.
  THE STORMS WERE MOVING EAST-NORTHEAST AT 35 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.

MILLER


&

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 7:14 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Rice	46 min
Aug 14, 7:50 PM CDT	Tornado Warning	MPX	Le Sueur, Rice	100 min
Aug 14, 7:50 PM CDT	Tornado Warning	MPX	Le Sueur, Rice	40 min
Aug 15, 4:33 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Meeker, Renville	42 min
Aug 15, 4:58 PM CDT	Severe Thunderstorm Warning	MPX	Wright	32 min
Aug 15, 5:02 PM CDT	Severe Thunderstorm Warning	MPX	McLeod	58 min
Aug 15, 5:26 PM CDT	Severe Thunderstorm Warning	MPX	Carver	64 min
Aug 15, 5:44 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Isanti	61 min
Aug 15, 6:04 PM CDT	Severe Thunderstorm Warning	MPX	Scott	66 min
Aug 15, 6:10 PM CDT	Severe Thunderstorm Warning	MPX	Chisago	30 min
Aug 15, 6:27 PM CDT	Severe Thunderstorm Warning	MPX	Dakota	63 min
Aug 15, 6:40 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur	50 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.