Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 4, NWS Twin Cities, MN

April 30, 2001Martin County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 30, 2001, 7:29 PM CDT for Martin County, Minnesota. It was in force for 61 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: Apr 30, 2001, 7:29 PM CDT (00:29 UTC)
Expired: Apr 30, 2001, 8:30 PM CDT
In force: 61 min
Issued by: NWS Twin Cities, MN
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Martin County, MN

The radar

The Minneapolis radar (KMPX), 153 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 30, 7:34 PM CDT	Hail 1	Truman, MN

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 nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.5 hours before the alert went out and 151 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: 317 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 750 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 28 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.

086 
WUUS53 KMPX 010031
SVRMSP
MNC091-010130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
729 PM CDT MON APR 30 2001

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 729 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE
  HAIL 15 MILES WEST OF TRIMONT...OR ABOUT 24 MILES SOUTHWEST OF     
  ST. JAMES...MOVING SOUTHEAST AT 25 MPH.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  FAIRMONT...SHERBURN...WELCOME...AND TRIMONT.

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

LAT...LON 4379 9481 4353 9486 4355 9430 4384 9432

The office that day

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

Issued	Product	Office	Counties	Lasted
May 1, 4:24 PM CDT	Severe Thunderstorm Warning	MPX	Carver, McLeod, Sibley	51 min
May 1, 4:36 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Faribault	39 min
May 1, 4:36 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur	39 min
May 1, 4:50 PM CDT	Tornado Warning	MPX	Blue Earth	25 min
May 1, 4:55 PM CDT	Tornado Warning	MPX	Carver	35 min
May 1, 5:06 PM CDT	Severe Thunderstorm Warning	MPX	Waseca	39 min
May 1, 5:13 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Hennepin	47 min
May 1, 5:18 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn	42 min
May 1, 5:21 PM CDT	Tornado Warning	MPX	Anoka, Hennepin	24 min
May 1, 5:27 PM CDT	Severe Thunderstorm Warning	MPX	Steele	48 min
May 1, 5:35 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Ramsey, Washington	55 min
May 1, 5:37 PM CDT	Tornado Warning	MPX	Waseca	23 min
May 1, 5:49 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Chisago	41 min
May 1, 6:03 PM CDT	Tornado Warning	MPX	Steele, Waseca	42 min
May 1, 6:31 PM CDT	Severe Thunderstorm Warning	MPX	Washington	29 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.