Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 72, NWS Twin Cities, MN

May 18, 1998Chippewa County, Renville County, Yellow Medicine County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 18, 1998, 7:00 PM CDT for Chippewa County, Renville County, Yellow Medicine County, Minnesota. It was in force for 60 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: May 18, 1998, 7:00 PM CDT (00:00 UTC)
Expired: May 18, 1998, 8:00 PM CDT
In force: 60 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Chippewa County, MN, Renville County, MN, Yellow Medicine County, MN

The radar

The Minneapolis radar (KMPX), 149 km from the middle of the area, began a volume at 00:02 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
May 18, 7:30 PM CDT	Hail 0.75	Hector, 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
May 18, 4:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.0 hours before the alert went out and 147 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: 3617 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 1794 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 55 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.

368 
WUUS1 KMSP 190001 RRA
SVRMSP
MNC023-129-173-190100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
700 PM CDT MON MAY 18 1998

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

* SEVERE THUNDERSTORM WARNING FOR...
  CHIPPEWA COUNTY IN WEST CENTRAL MINNESOTA
  RENVILLE COUNTY IN CENTRAL MINNESOTA
  EASTERN YELLOW MEDICINE COUNTY IN SOUTHWESTERN MINNESOTA

* UNTIL 800 PM CDT

* AT 700 PM CDT...DOPPLER RADAR INDICATED A SEVERE STORM AT GRANITE
  FALLS.  THE STORM WAS MOVING NORTHEAST AT 25 MPH.

* SOME LOCATIONS AFFECTED
    GRANITE FALLS
    MAYNARD
    CLARA CITY
    SACRED HEART
    RENVILLE

THIS IS A DANGEROUS STORM...WITH LARGE HAIL.  STAY INDOORS AWAY
FROM WINDOWS.

JMP

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 7:08 PM CDT	Severe Thunderstorm Warning	MPX	McLeod	47 min
May 18, 7:27 PM CDT	Severe Thunderstorm Warning	MPX	Nicollet, Sibley	63 min
May 18, 7:27 PM CDT	Severe Thunderstorm Warning	MPX	Carver	63 min
May 18, 7:37 PM CDT	Severe Thunderstorm Warning	MPX	Hennepin, Wright	53 min
May 18, 7:55 PM CDT	Severe Thunderstorm Warning	MPX	McLeod	65 min
May 18, 7:58 PM CDT	Tornado Warning	MPX	McLeod	62 min
May 18, 8:04 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Hennepin, Ramsey, Scott, Washington	61 min
May 18, 8:21 PM CDT	Severe Thunderstorm Warning	MPX	Morrison, Stearns	64 min
May 18, 8:38 PM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Meeker	42 min
May 18, 8:49 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Hennepin, Scott	61 min
May 18, 8:49 PM CDT	Severe Thunderstorm Warning	MPX	Carver	61 min
May 18, 8:57 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Nicollet	63 min
May 18, 9:26 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Sherburne, Stearns	64 min
May 18, 9:34 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue, Rice	66 min
May 18, 9:55 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Nicollet	40 min
May 18, 10:45 PM CDT	Severe Thunderstorm Warning	MPX	Waseca	30 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.