Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 303, NWS Twin Cities, MN

August 22, 1998Carver County, Hennepin County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 22, 1998, 7:30 PM CDT for Carver County, Hennepin County, Minnesota. It was in force for 65 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
Aug 22, 1998, 7:30 PM CDT (00:30 UTC)
Expired
Aug 22, 1998, 8:35 PM CDT
In force
65 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Carver County, MN, Hennepin County, MN

What was reported inside it

TimeReportWhereRemark
Aug 22, 7:53 PM CDTHail 0.75Chanhassen, MNMeasured at NWS forecast office.
Aug 22, 8:25 PM CDTThunderstorm Wind 50Bloomington, MNLarge branches down. 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
Aug 22, 7:30 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.5 hours before the alert went out and 8 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, Minneapolis, MN at 00:00Z on 1998-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2973 joules per kilogram.LCLEL10008507005003002001001 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, Minneapolis, MN at 00:00Z on 1998-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 255 square meters per square second.19395878Sfc1 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
2973 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
823 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
255 m²/s²
0-3 km storm-relative helicity
351 m²/s²
Significant tornado parameter
4.3
Supercell composite
21.4

Open this sounding in Storm Lab

The text

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

749 
WUUS1 KMSP 230033 RRA
SVRMSP
MNC019-053-230130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
730 PM CDT SAT AUG 22 1998

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

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CARVER COUNTY IN EAST CENTRAL MINNESOTA
  HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA

* UNTIL 835 PM CDT

* AT 730 PM CDT...DOPPLER RADAR INDICATED A SEVERE STORM WITH
LARGE   HAIL AND DAMAGING WINDS 5 MILES NORTH OF WACONIA...OR ABOUT
30   MILES WEST OF MINNEAPOLIS.  THE STORM WAS MOVING EAST AT 25
MPH.

* SOME LOCATIONS AFFECTED
    ROCKFORD
    PLYMOUTH
    BLOOMINGTON
    MINNETONKA
    MINNEAPOLIS

DAMAGING WINDS AND LARGE HAIL ARE LIKELY.  GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS.

A TORNADO WATCH IS IN EFFECT.  SEVERE THUNDERSTORMS CAN PRODUCE
TORNADOES.
CWS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 7:57 PM CDTSevere Thunderstorm WarningMPXDakota, Scott63 min
Aug 22, 8:10 PM CDTTornado WarningMPXDakota, Scott30 min
Aug 22, 8:35 PM CDTSevere Thunderstorm WarningMPXHennepin, Ramsey, Washington45 min
Aug 22, 8:35 PM CDTSevere Thunderstorm WarningMPXCarver45 min
Aug 22, 8:40 PM CDTTornado WarningMPXDakota65 min
Aug 22, 9:14 PM CDTFlash Flood WarningMPXCarver, Dakota, Hennepin, Scott2 hr
Aug 22, 9:19 PM CDTSevere Thunderstorm WarningMPXGoodhue51 min
Aug 22, 9:27 PM CDTSevere Thunderstorm WarningMPXDakota, Scott63 min
Aug 22, 9:51 PM CDTFlash Flood WarningMPXScott69 min
Aug 23, 3:15 AM CDTSevere Thunderstorm WarningMPXLac qui Parle45 min
Aug 23, 3:33 AM CDTSevere Thunderstorm WarningMPXChippewa, Swift42 min
Aug 23, 4:07 AM CDTSevere Thunderstorm WarningMPXKandiyohi58 min
Aug 23, 4:10 AM CDTSevere Thunderstorm WarningMPXYellow Medicine35 min
Aug 23, 4:14 AM CDTSevere Thunderstorm WarningMPXChippewa, Swift16 min
Aug 23, 4:40 AM CDTSevere Thunderstorm WarningMPXMeeker60 min
Aug 23, 5:02 AM CDTSevere Thunderstorm WarningMPXWright43 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.