Alert archive / Minnesota / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 21, NWS Duluth, MN

April 18, 2004Saint Louis County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Apr 18, 2004, 10:07 AM CDT for Saint Louis County, Minnesota. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 18, 2004, 10:07 AM CDT (15:07 UTC)
Expired
Apr 18, 2004, 10:45 AM CDT
In force
38 min
Issued by
NWS Duluth, MN
Area
Counties, with a storm outline in the text

County Saint Louis County, MN

The radar

The Duluth radar (KDLH), 32 km from the middle of the area, began a volume at 15:06 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.

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 3.1 hours before the alert went out and 186 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, International Fa, MN at 12:00Z on 2004-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, International Fa, MN at 12:00Z on 2004-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 245 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1153 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
245 m²/s²
0-3 km storm-relative helicity
254 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.

342 
WUUS53 KDLH 181507
SVRDLH
MNC137-181545-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DULUTH MN
1007 AM CDT SUN APR 18 2004

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL ST. LOUIS COUNTY IN NORTHEAST MINNESOTA
  SOUTHEAST ST. LOUIS COUNTY IN NORTHEAST MINNESOTA

* UNTIL 1045 AM CDT

* AT 1007 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH
  LARGE HAIL AND DAMAGING WINDS 10 MILES WEST OF TAFT...OR ABOUT 26
  MILES NORTHWEST OF DULUTH...MOVING EAST AT 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SHAW AROUND 1010 AM...
  ISLAND LAKE AROUND 1015 AM...
  BRIMSON AROUND 1035 AM...

DAMAGING HAIL UP TO ONE INCH IN DIAMETER AND DESTRUCTIVE WINDS OVER
60 MPH ARE LIKELY WITH THIS STORM. TAKE COVER IN A STURDY BUILDING
AND STAY AWAY FROM WINDOWS. IF CAUGHT OUTDOORS GET INTO A DEPRESSION
SUCH AS A RAVINE OR DITCH.

LAT...LON 4710 9179 4699 9220 4692 9243 4720 9240
          4736 9191

$$
LT

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 18, 2:20 AM CDTSevere Thunderstorm WarningDLHPine55 min
Apr 18, 3:17 AM CDTSevere Thunderstorm WarningDLHPine58 min
Apr 18, 7:18 AM CDTSevere Thunderstorm WarningDLHPine27 min
Apr 18, 8:01 AM CDTSevere Thunderstorm WarningDLHCass44 min
Apr 18, 8:39 AM CDTSevere Thunderstorm WarningDLHCass, Crow Wing51 min
Apr 18, 8:42 AM CDTSevere Thunderstorm WarningDLHItasca33 min
Apr 18, 9:47 AM CDTSevere Thunderstorm WarningDLHSaint Louis28 min
Apr 18, 10:33 AM CDTSevere Thunderstorm WarningDLHLake42 min
Apr 18, 11:06 AM CDTSpecial Marine WarningDLH54 min
Apr 18, 12:13 PM CDTSevere Thunderstorm WarningDLHSaint Louis62 min
Apr 18, 12:58 PM CDTSevere Thunderstorm WarningDLHLake62 min
Apr 18, 1:35 PM CDTSevere Thunderstorm WarningDLHCook55 min
Apr 18, 3:36 PM CDTSevere Thunderstorm WarningDLHSaint Louis39 min
Apr 18, 3:59 PM CDTTornado WarningDLHPine61 min
Apr 18, 4:13 PM CDTSevere Thunderstorm WarningDLHLake, Saint Louis62 min
Apr 18, 4:30 PM CDTSpecial Marine WarningDLH60 min
Apr 18, 5:13 PM CDTSevere Thunderstorm WarningDLHSaint Louis32 min
Apr 18, 5:31 PM CDTSpecial Marine WarningDLH89 min
Apr 18, 5:31 PM CDTSpecial Marine WarningDLH89 min
Apr 18, 5:53 PM CDTSevere Thunderstorm WarningDLHLake52 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2004Every severe thunderstorm warning in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.