Alert archive / Minnesota / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 65, NWS Twin Cities, MN

April 18, 2004Martin County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 18, 2004, 7:29 PM CDT for Martin County, Minnesota. It was in force for 61 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 18, 2004, 7:29 PM CDT (00:29 UTC)
Expired: Apr 18, 2004, 8:30 PM CDT
In force: 61 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Martin County, MN

The radar

The Sioux Falls radar (KFSD), 163 km from the middle of the area, began a volume at 00:32 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
Apr 18, 7:30 PM CDT	HAIL 0.88	4 S Alpha, MN
Apr 18, 7:30 PM CDT	HAIL 0.88	Alpha, MN
Apr 18, 7:40 PM CDT	HAIL 0.75	Sherburn, MN
Apr 18, 7:45 PM CDT	TSTM WND GST 60	Sherburn, MN	SMALL DENTS TO GUTTERS AND CARS. FEW DOWNED TREE LIMBS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 18, 4:40 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.5 hours before the alert went out and 165 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: 671 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 2341 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 244 m²/s²
0-3 km storm-relative helicity: 328 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

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

541 
WUUS53 KMPX 190029
SVRMPX
MNC091-190130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
728 PM CDT SUN APR 18 2004

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MARTIN COUNTY IN SOUTH CENTRAL MINNESOTA

* UNTIL 830 PM CDT

* AT 728 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE
  HAIL AND DAMAGING WINDS 15 MILES WEST OF DUNNELL...OR ABOUT 6 MILES
  NORTHEAST OF SPIRIT LAKE...MOVING EAST AT 65 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CEYLON.
  DUNNELL.
  FAIRMONT.
  GRANADA.
  NORTHROP.
  SHERBURN.
  WELCOME.

DAMAGING WINDS ARE LIKELY WITH STORM...WITH GUSTS UP TO 75 MPH 
POSSIBLE.

THIS IS A DANGEROUS STORM...STAY INDOORS AWAY FROM WINDOWS. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

LAT...LON 4361 9503 4344 9494 4353 9427 4382 9428

$$

RAH/SEB

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 7:02 PM CDT	Severe Thunderstorm Warning	MPX	Chisago	43 min
Apr 18, 7:02 PM CDT	Severe Thunderstorm Warning	MPX	Nicollet	58 min
Apr 18, 7:12 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Scott	63 min
Apr 18, 7:13 PM CDT	Severe Thunderstorm Warning	MPX	Ramsey, Washington	47 min
Apr 18, 7:19 PM CDT	Severe Thunderstorm Warning	MPX	Sibley	41 min
Apr 18, 7:22 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Faribault	53 min
Apr 18, 7:33 PM CDT	Severe Thunderstorm Warning	MPX	Carver	42 min
Apr 18, 7:45 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Rice	60 min
Apr 18, 7:54 PM CDT	Tornado Warning	MPX	Scott	36 min
Apr 18, 8:04 PM CDT	Tornado Warning	MPX	Dakota	26 min
Apr 18, 8:17 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn, Steele, Waseca	58 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2004 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.