Alert archive / Minnesota / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 367, NWS Sioux Falls, SD

July 12, 2004Rock County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 12, 2004, 11:44 PM CDT for Rock County, Minnesota. It was in force for 46 min. 2 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: Jul 12, 2004, 11:44 PM CDT (04:44 UTC)
Expired: Jul 13, 2004, 12:30 AM CDT
In force: 46 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

County Rock County, MN

The radar

The Sioux Falls radar (KFSD), 45 km from the middle of the area, began a volume at 04:47 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
Jul 12, 11:48 PM CDT	HAIL 0.75	Hardwick, MN
Jul 12, 11:54 PM CDT	HAIL 1.75	5 N Luverne, MN

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
Jul 12, 6:20 PM CDT	Tornado Watch	SPC	7 hr
Jul 12, 9:50 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 4.7 hours before the alert went out and 221 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: 1108 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 1722 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFSD 130444
SVRFSD
MNC133-130530-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1144 PM CDT MON JUL 12 2004

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ROCK COUNTY IN SOUTHWEST MINNESOTA

* UNTIL 1230 AM CDT

* AT 1142 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  HARDWICK...OR ABOUT 7 MILES NORTH OF LUVERNE...MOVING SOUTH AT 20
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LUVERNE AROUND MIDNIGHT CDT

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL AND DAMAGING WIND.
GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

LAT...LON 4384 9609 4377 9636 4350 9632 4352 9607

$$

BOUSTEAD

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 12, 7:00 PM CDT	Severe Thunderstorm Warning	FSD	Rock	45 min
Jul 12, 7:42 PM CDT	Severe Thunderstorm Warning	FSD	Nobles, Rock	48 min
Jul 12, 9:53 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln	37 min
Jul 12, 10:33 PM CDT	Severe Thunderstorm Warning	FSD	Pipestone	42 min
Jul 12, 11:10 PM CDT	Severe Thunderstorm Warning	FSD	Rock	35 min
Jul 12, 11:13 PM CDT	Severe Thunderstorm Warning	FSD	Pipestone	32 min
Jul 13, 12:04 AM CDT	Severe Thunderstorm Warning	FSD	Nobles	41 min
Jul 13, 12:28 AM CDT	Severe Thunderstorm Warning	FSD	Rock	47 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.