Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 25, NWS Twin Cities, MN

May 9, 20014 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 9, 2001, 5:10 PM CDT for 4 counties in Minnesota. It was in force for 50 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: May 9, 2001, 5:10 PM CDT (22:10 UTC)
Expired: May 9, 2001, 6:00 PM CDT
In force: 50 min
Issued by: NWS Twin Cities, MN
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties McLeod County, MN, Meeker County, MN, Renville County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 67 km from the middle of the area, began a volume at 22:11 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
May 9, 6:09 PM CDT	Thunderstorm Wind 50 E	Glencoe, MN	Large branches ripped down.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

Issued	Product	Office	Lasted
May 9, 4:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.2 hours before the alert went out and 65 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: 6 J/kg
Mixed-layer CIN: -233 J/kg
Mixed-layer LCL: 1853 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 283 m²/s²
0-3 km storm-relative helicity: 291 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 KMPX 092212
SVRMSP
MNC019-085-093-129-143-171-092300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
510 PM CDT WED MAY 9 2001

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SIBLEY COUNTY IN CENTRAL MINNESOTA
  MCLEOD COUNTY IN CENTRAL MINNESOTA
  WRIGHT COUNTY IN CENTRAL MINNESOTA
  CARVER COUNTY IN EAST CENTRAL MINNESOTA
  RENVILLE COUNTY IN CENTRAL MINNESOTA
  MEEKER COUNTY IN CENTRAL MINNESOTA

* UNTIL 600 PM CDT

* AT 510 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE   
HAIL ALONG A LINE EXTENDING 12 MILES SOUTHEAST OF OLIVIA TO 20 MILES 
NORTH OF NEW ULM...MOVING NORTHEAST AT 45 MPH.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  WACONIA.
  HUTCHINSON.
  GLENCOE.
  GAYLORD.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER...
SEVERE THUNDERSTORMS CAN dPRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

LAT...LON 4471 9496 4451 9431 4480 9358 4511 9413
          4504 9456

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 5:10 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Wright	50 min
May 9, 6:12 PM CDT	Severe Thunderstorm Warning	MPX	Carver, McLeod	48 min
May 9, 6:43 PM CDT	Tornado Warning	MPX	Carver	32 min
May 9, 6:52 PM CDT	Severe Thunderstorm Warning	MPX	Scott	23 min
May 9, 6:58 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec	32 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2001 Every severe thunderstorm warning in 2001

Sources

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