Alert archive / Minnesota / Tornado Warnings in 1998

Tornado Warning 51, NWS Twin Cities, MN

July 18, 1998Stevens County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Jul 18, 1998, 9:05 PM CDT for Stevens County, Minnesota. It was in force for 60 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 18, 1998, 9:05 PM CDT (02:05 UTC)
Expired: Jul 18, 1998, 10:05 PM CDT
In force: 60 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Stevens County, MN

The radar

The Aberdeen radar (KABR), 189 km from the middle of the area, began a volume at 02:07 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
Jul 18, 8:45 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.1 hours before the alert went out and 203 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: 2715 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 1730 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: -4 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -1.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 190206
TORMSP
MNC149-190305-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
905 PM CDT SAT JUL 18 1998

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES/CHANHASSEN HAS
ISSUED A

* TORNADO WARNING FOR...
  STEVENS COUNTY IN WEST CENTRAL MINNESOTA

* UNTIL 1005 PM CDT

* AT 905 PM CDT...DOPPLER RADAR DETECTED A POSSIBLE TORNADO NEAR
  WHEATON...35 MILES NORTHWEST OF MORRIS.  THE STORM WAS MOVING
  SOUTHEAST AT 45 MPH.

* SOME LOCATIONS AFFECTED
    MORRIS
    ALBERTA
    CHOKIO
    DONNELLY
    HANCOCK

IF YOU ARE IN A MULTIPLE STORY BUILDING...GO TO A SMALL INTERIOR
ROOM AWAY FROM WINDOWS!

EDWARDS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 9:47 PM CDT	Severe Thunderstorm Warning	MPX	Redwood	33 min
Jul 18, 10:03 PM CDT	Severe Thunderstorm Warning	MPX	Stevens, Swift	62 min
Jul 18, 10:06 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Watonwan	49 min
Jul 18, 11:09 PM CDT	Severe Thunderstorm Warning	MPX	Faribault	46 min
Jul 18, 11:25 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Rice, Waseca	50 min

Nearby

Tornado Warnings in Minnesota, 1998 Every tornado warning in 1998 Tornadoes in 1998

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.