Alert archive / Minnesota / Tornado Warnings in 1997

Tornado Warning 28, NWS Twin Cities, MN

August 2, 1997Sherburne County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Aug 2, 1997, 9:10 PM CDT for Sherburne County, Minnesota. It was in force for 35 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 2, 1997, 9:10 PM CDT (02:10 UTC)
Expired
Aug 2, 1997, 9:45 PM CDT
In force
35 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Sherburne County, MN

The radar

The Minneapolis radar (KMPX), 68 km from the middle of the area, began a volume at 02:11 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.

IssuedProductOfficeLasted
Aug 2, 5:30 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.2 hours before the alert went out and 67 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 1997-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1589 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 1997-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 square meters per square second.1939587897Sfc1 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
1589 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
1478 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
100 m²/s²
Significant tornado parameter
0.3
Supercell composite
4.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 030210 RRA
TORMSP
MNC141-030245-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
910 PM CDT SAT AUG 2 1997

* TORNADO WARNING FOR
  SOUTHERN SHERBURNE COUNTY - CENTRAL MINNESOTA

* UNTIL 945 PM CDT
 
* SOME LOCATIONS AFFECTED
    BIG LAKE
    CLEAR LAKE
    ELK RIVER

* AT 910 PM CDT DOPPLER RADAR DETECTED A DEVELOPING TORNADO JUST
  WEST OF BIG LAKE OR ABOUT 20 MILES SOUTHEAST OF ST. CLOUD.  THE
  STORM WAS MOVING EAST AT 30 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
Aug 2, 7:11 PM CDTSevere Thunderstorm WarningMPXTodd49 min
Aug 2, 7:27 PM CDTSevere Thunderstorm WarningMPXPope33 min
Aug 2, 7:44 PM CDTSevere Thunderstorm WarningMPXSwift61 min
Aug 2, 8:23 PM CDTSevere Thunderstorm WarningMPXMille Lacs52 min
Aug 2, 8:29 PM CDTSevere Thunderstorm WarningMPXBenton, Sherburne, Stearns61 min
Aug 2, 8:52 PM CDTSevere Thunderstorm WarningMPXKandiyohi, Pope38 min
Aug 2, 8:56 PM CDTTornado WarningMPXWright34 min
Aug 2, 9:20 PM CDTFlash Flood WarningMPXAnoka, Hennepin55 min
Aug 2, 9:20 PM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin55 min
Aug 2, 9:44 PM CDTTornado WarningMPXMeeker, Wright46 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.