Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 231, NWS Twin Cities, MN

July 30, 2002Steele County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 30, 2002, 5:45 PM CDT for Steele County, Minnesota. It was in force for 45 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: Jul 30, 2002, 5:45 PM CDT (22:45 UTC)
Expired: Jul 30, 2002, 6:30 PM CDT
In force: 45 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Steele County, MN

The radar

The Minneapolis radar (KMPX), 84 km from the middle of the area, began a volume at 22:47 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.

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 30, 3:40 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.8 hours before the alert went out and 85 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: 767 J/kg
Mixed-layer CIN: -274 J/kg
Mixed-layer LCL: 2024 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 280 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

983 
WUUS53 KMPX 302245
SVRMSP
MNC147-302330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
544 PM CDT TUE JUL 30 2002

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 630 PM CDT

* AT 544 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE
  HAIL AND DAMAGING WINDS 7 MILES SOUTHWEST OF MEDFORD...OR ABOUT 7
  MILES WEST OF OWATONNA...MOVING EAST AT 30 MPH.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  MEDFORD.
  OWATONNA.
  DEERFIELD.

THIS WARNING EXTENDS THE PREVIOUS SEVERE THUNDERSTORM WARNING FOR 
STEELE COUNTY.

LARGE HAIL AND DAMAGING WINDS ARE LIKELY WITH THIS STORM. TAKE COVER
IN A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

LAT...LON 4419 9341 4402 9340 4401 9306 4419 9307

RAH/SEB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 4:13 PM CDT	Severe Thunderstorm Warning	MPX	Rice	47 min
Jul 30, 4:44 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	46 min
Jul 30, 5:00 PM CDT	Severe Thunderstorm Warning	MPX	Rice	30 min
Jul 30, 5:37 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Waseca	38 min
Jul 30, 6:09 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn	51 min

Nearby

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.