Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 269, NWS Twin Cities, MN

July 14, 1998Stevens County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 14, 1998, 7:39 PM CDT for Stevens County, Minnesota. It was in force for 61 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 14, 1998, 7:39 PM CDT (00:39 UTC)
Expired
Jul 14, 1998, 8:40 PM CDT
In force
61 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 00:40 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 14, 7:45 PM CDTThunderstorm Wind 50Morris, MNTree blown down on University campus. 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 14, 2:00 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.7 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-pSkew-T log-p diagram, Aberdeen, SD at 00:00Z on 1998-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4358 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, Aberdeen, SD at 00:00Z on 1998-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 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
4358 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
1271 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
51 m²/s²
Significant tornado parameter
-0.1
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 150039 RRA
SVRMSP
MNC149-150140-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
739 PM CDT TUE JUL 14 1998

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

* SEVERE THUNDERSTORM WARNING FOR...
  STEVENS COUNTY IN WEST CENTRAL MINNESOTA

* UNTIL 840 PM CDT

* AT 737 PM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE STORMS
  WITH LARGE HAIL FROM 10 MILES NORTHEAST OF MORRIS TO 20 MILES
  SOUTHWEST OF MORRIS.  THE STORMS WERE MOVING SOUTHEAST AT 20 MPH.

* SOME LOCATIONS AFFECTED
    MORRIS
    ALBERTA
    HANCOCK
    CHOKIO

THESE ARE DANGEROUS STORMS WITH A HISTORY OF PRODUCING LARGE HAIL.
STAY INDOORS6 AWAY FROM WINDOWS.


JMP

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 7:05 PM CDTSevere Thunderstorm WarningMPXMorrison, Stearns, Todd60 min
Jul 14, 7:09 PM CDTSevere Thunderstorm WarningMPXDouglas31 min
Jul 14, 8:05 PM CDTSevere Thunderstorm WarningMPXKandiyohi, Pope, Stearns, Swift60 min
Jul 14, 8:29 PM CDTSevere Thunderstorm WarningMPXChippewa, Lac qui Parle61 min
Jul 14, 8:47 PM CDTSevere Thunderstorm WarningMPXKandiyohi48 min
Jul 14, 9:26 PM CDTTornado WarningMPXKandiyohi, Renville34 min
Jul 14, 9:53 PM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin62 min
Jul 14, 10:01 PM CDTSevere Thunderstorm WarningMPXRedwood, Renville, Yellow Medicine64 min
Jul 14, 10:20 PM CDTSevere Thunderstorm WarningMPXCarver, Dakota, Scott60 min
Jul 14, 10:20 PM CDTSevere Thunderstorm WarningMPXRamsey, Washington60 min
Jul 14, 10:54 PM CDTSevere Thunderstorm WarningMPXBrown61 min
Jul 15, 12:43 AM CDTSevere Thunderstorm WarningMPXFreeborn47 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1998Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.