Alert archive / Minnesota / Tornado Warnings in 1997

Tornado Warning 15, NWS Twin Cities, MN

July 1, 1997Isanti County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Jul 1, 1997, 8:14 PM CDT for Isanti County, Minnesota. It was in force for 46 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
Jul 1, 1997, 8:14 PM CDT (01:14 UTC)
Expired
Jul 1, 1997, 9:00 PM CDT
In force
46 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Isanti County, MN

The radar

The Minneapolis radar (KMPX), 82 km from the middle of the area, began a volume at 01:14 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

TimeReportWhereRemark
Jul 1, 8:40 PM CDTThunderstorm Wind 55Braham, MNCar blown into ditch. Trees 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 watch it was issued in

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

IssuedProductOfficeLasted
Jul 1, 3:00 PM CDTTornado WatchSPC6 hr
Jul 1, 7:45 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.2 hours before the alert went out and 83 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 1997-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1759 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 1997-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 303 square meters per square second.19395878Sfc1 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
1759 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
1186 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
303 m²/s²
0-3 km storm-relative helicity
455 m²/s²
Significant tornado parameter
4.3
Supercell composite
21.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 020115 RRA
TORMSP
MNC059-020200-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
814 PM CDT TUE JUL 1 1997

* TORNADO WARNING FOR
  ISANTI COUNTY - EAST CENTRAL MINNESOTA

* UNTIL 900 PM CDT
 
* SOME LOCATIONS AFFECTED
    CROWN
    ISANTI
    CAMBRIDGE

* AT 813 PM CDT DOPPLER RADAR DETECTED A POSSIBLE TORNADO 15 MILES
  SOUTHWEST OF CAMBRIDGE.  THE STORM WAS MOVING NORTHEAST AT 35 MPH.

GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR!

HOWIESON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 7:26 PM CDTSevere Thunderstorm WarningMPXAnoka, Isanti64 min
Jul 1, 7:26 PM CDTSevere Thunderstorm WarningMPXRamsey64 min
Jul 1, 7:33 PM CDTSevere Thunderstorm WarningMPXMcLeod, Wright42 min
Jul 1, 7:53 PM CDTSevere Thunderstorm WarningMPXCarver, Sibley37 min
Jul 1, 7:53 PM CDTSevere Thunderstorm WarningMPXHennepin37 min
Jul 1, 7:56 PM CDTSevere Thunderstorm WarningMPXDakota, Scott64 min
Jul 1, 8:01 PM CDTTornado WarningMPXAnoka29 min
Jul 1, 8:10 PM CDTSevere Thunderstorm WarningMPXChisago, Washington50 min
Jul 1, 8:48 PM CDTSevere Thunderstorm WarningMPXGoodhue57 min
Jul 1, 8:56 PM CDTSevere Thunderstorm WarningMPXDakota34 min
Jul 1, 9:23 PM CDTTornado WarningMPXRenville, Yellow Medicine27 min
Jul 1, 9:47 PM CDTSevere Thunderstorm WarningMPXGoodhue28 min
Jul 1, 9:51 PM CDTTornado WarningMPXKandiyohi, Renville29 min
Jul 1, 10:17 PM CDTTornado WarningMPXMeeker43 min
Jul 1, 10:30 PM CDTSevere Thunderstorm WarningMPXWashington35 min
Jul 1, 11:43 PM CDTSevere Thunderstorm WarningMPXRice32 min

Nearby

Tornado Warnings in Minnesota, 1997Every tornado warning in 1997Tornadoes 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.