Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 279, NWS Twin Cities, MN

July 18, 1998Redwood County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 18, 1998, 9:47 PM CDT for Redwood County, Minnesota. It was in force for 33 min. 2 reports 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 18, 1998, 9:47 PM CDT (02:47 UTC)
Expired: Jul 18, 1998, 10:20 PM CDT
In force: 33 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Redwood County, MN

The radar

The Minneapolis radar (KMPX), 142 km from the middle of the area, began a volume at 02:49 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

Time	Report	Where	Remark
Jul 18, 10:00 PM CDT	Thunderstorm Wind 52	Wabasso, MN
Jul 18, 10:00 PM CDT	Thunderstorm Wind 52	Walnut Grove, MN

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.

Issued	Product	Office	Lasted
Jul 18, 8:45 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.8 hours before the alert went out and 140 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: 16 J/kg
Mixed-layer CIN: -548 J/kg
Mixed-layer LCL: 2130 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: -72 m²/s²
0-3 km storm-relative helicity: 450 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 190248
SVRMSP
MNC127-190320-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
947 PM CDT SAT JUL 18 1998

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

* SEVERE THUNDERSTORM WARNING FOR...
  REDWOOD COUNTY IN SOUTHWESTERN MINNESOTA

* UNTIL 1020 PM CDT

* AT 945 PM CDT...DOPPLER RADAR INDICATED A SEVERE STORM 5 EAST OF
  MARSHALL.  THE STORM WAS MOVING EAST 35 MPH.

* SOME LOCATIONS AFFECTED
    MILROY
    LUCAN
    WABASSO
    WALNUT GROVE
    LAMBERTON
    WANDA

69 MPH WINDS WERE REPORTED AT MARSHALL AT 935PM CDT.
THIS IS A DANGEROUS STORM. STAY INDOORS AWAY FROM WINDOWS.

A TORNADO WATCH IS4 IN EFFECT.  SEVERE THUNDERSTORMS CAN PRODUCE
TORNADOES.
EDWARDS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 9:05 PM CDT	Tornado Warning	MPX	Stevens	60 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

Severe Thunderstorm Warnings in Minnesota, 1998 Every 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.