Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 150, NWS Twin Cities, MN

June 15, 1998Chisago County, Isanti County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 15, 1998, 9:03 PM CDT for Chisago County, Isanti County, Minnesota. It was in force for 47 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: Jun 15, 1998, 9:03 PM CDT (02:03 UTC)
Expired: Jun 15, 1998, 9:50 PM CDT
In force: 47 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Chisago County, MN, Isanti County, MN

The radar

The Minneapolis radar (KMPX), 84 km from the middle of the area, began a volume at 02:04 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
Jun 15, 9:10 PM CDT	Hail 0.75	Isanti, 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.1 hours before the alert went out and 85 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: 320 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1557 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 86 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.

005 
WUUS1 KMSP 160205 RRA
SVRMSP
MNC025-059-160250-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
903 PM CDT MON JUN 15 1998

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

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CHISAGO COUNTY IN EAST CENTRAL MINNESOTA
  NORTHERN ISANTI COUNTY IN EAST CENTRAL MINNESOTA

* UNTIL 950 PM CDT

* AT 902 PM CDT...DOPPLER RADAR INDICATED A SEVERE STORM WITH
  LARGE HAIL NEAR RUSH CITY OR 15 MILES TO THE EAST OF CAMBRIDGE.
  THE STORM WAS MOVING WEST AT 15 MPH.

* SOME LOCATIONS AFFECTED
    HARRIS
    STANCHFIELD
    GRANDY

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


TIPTON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 15, 8:12 PM CDT	Severe Thunderstorm Warning	MPX	Washington	48 min
Jun 16, 4:07 PM CDT	Severe Thunderstorm Warning	MPX	Ramsey	33 min
Jun 16, 4:18 PM CDT	Tornado Warning	MPX	Freeborn	32 min
Jun 16, 5:39 PM CDT	Severe Thunderstorm Warning	MPX	Ramsey	31 min
Jun 16, 5:51 PM CDT	Severe Thunderstorm Warning	MPX	Anoka	34 min
Jun 16, 6:22 PM CDT	Severe Thunderstorm Warning	MPX	Scott	33 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.