Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 4, NWS Duluth, MN

April 18, 2002Burnett County, Wisconsin; Pine County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Apr 18, 2002, 2:33 AM CDT for Burnett County, Wisconsin; Pine County, Minnesota. It was in force for 57 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, 2002, 2:33 AM CDT (07:33 UTC)
Expired: Apr 18, 2002, 3:30 AM CDT
In force: 57 min
Issued by: NWS Duluth, MN
Area: Counties, with a storm outline in the text

Counties Pine County, MN, Burnett County, WI

The radar

The Duluth radar (KDLH), 97 km from the middle of the area, began a volume at 07:36 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 7.6 hours before the alert went out and 153 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2104 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 146 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 
WUUS53 KDLH 180733
SVRDLH
MNC115-WIC013-180830-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DULUTH MN
233 AM CDT THU APR 18 2002

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  PINE COUNTY IN EAST CENTRAL MINNESOTA
  BURNETT COUNTY IN NORTHWEST WISCONSIN

* UNTIL 330 AM CDT

* AT 233 AM CDT DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH
  LARGE HAIL 13 MILES SOUTHWEST OF DANBURY...OR ABOUT 18 MILES
  SOUTHEAST OF HINCKLEY...MOVING NORTHEAST AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  DANBURY AROUND 240 AM CDT...
  MARKVILLE AROUND 245 AM CDT...
  RIVERSIDE AROUND 250 AM CDT...

THIS IS A DANGEROUS STORM WITH DAMAGING HAIL OVER ONE INCH...STAY
INDOORS AWAY FROM WINDOWS.

.END

LAT...LON 4592 9275 4581 9262 4613 9205 4616 9232

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Duluth, MN wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 18, 2:30 AM CDT, 3 minutes earlier.

Area forecast discussion, Apr 18, 2:30 AM CDT, 3 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DULUTH MN
230 AM CDT THU APR 18 2002

TSTMS CURRENTLY FIRING OVR SRN HALF OF MN AND WRN WI VCNTY WFNT. AMS
NOT TERRIBLY UNSTABLE...BUT LIFT BEING SUPPLIED BY 65KT 850 MB JET
OVERRUNING WFNT. CELLS WILL ENTER EVEN MORE STABLE AIR AS THEY
APPROACH OUR CWA...SO DO NOT EXPECT SVR CRITERIA...BUT IT WILL BE
CLOSE. WILL LEAVE TSTMS IN 1ST PD AS SFC LOW CONTS ITS WAY TO ENE
DURING THE DAY. OUR WI CWA WILL HAVE BEST CHC OF TSTMS AS LI/S DIP
CLOSE TO -6 AND CAPES INCRS TO AROUND 1500 J/KG. SEE SWODY1 FOR MORE
DETAILS. CAA BEGINS LATE TDA AS CFNT PUSHES THRU FROM NW...BUT 500
MB S/WV AND VORT MAX MOVG NE ACRS NRN MN WILL KEEP CHCS OF SHRA
ALIVE THU 2ND PD AS WELL. TEMPS AND THKNS VALUES LOWER SUFFICIENTLY
TO LEAVE MENTION OF SHSN IN FCST. CAA AND DRYING CONT INTO FRI AS
SFC HIGH SETTLES SWD...BUT AVN MAINTAINS SOME MINIMAL QPF OVR AREA
AND UPR LVL TROF CONTS ITS APPROACH...SO WILL RETAIN SLGT POPS ON
FRI. COOLING TREND BEHIND CFNT PICKED UP NICELY BY MOS...AND ONLY
SMALL ADJUSTMENTS NEEDED TO CURRENT ZFP.

.DLH...NONE.

ERF

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 3:43 PM CDT	Severe Thunderstorm Warning	DLH	Price	47 min
Apr 18, 4:30 PM CDT	Severe Thunderstorm Warning	DLH	Price	45 min
Apr 18, 4:56 PM CDT	Severe Thunderstorm Warning	DLH	Iron	34 min
Apr 18, 5:15 PM CDT	Severe Thunderstorm Warning	DLH	Price	60 min
Apr 18, 5:37 PM CDT	Severe Thunderstorm Warning	DLH	Sawyer	38 min
Apr 18, 5:46 PM CDT	Severe Thunderstorm Warning	DLH	Iron	59 min
Apr 18, 6:10 PM CDT	Tornado Warning	DLH	Price	35 min
Apr 18, 6:13 PM CDT	Tornado Warning	DLH	Price	32 min
Apr 18, 6:16 PM CDT	Severe Thunderstorm Warning	DLH	Iron	59 min
Apr 18, 6:19 PM CDT	Tornado Warning	DLH	Iron	56 min
Apr 18, 6:44 PM CDT	Tornado Warning	DLH	Price	16 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2002 Severe Thunderstorm Warnings in Minnesota, 2002 Every severe thunderstorm warning in 2002

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.