Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 4, NWS Twin Cities, MN

April 16, 20024 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 16, 2002, 8:12 PM CDT for 4 counties in Minnesota. It was in force for 48 min. 3 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 16, 2002, 8:12 PM CDT (01:12 UTC)
Expired: Apr 16, 2002, 9:00 PM CDT
In force: 48 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Brown County, MN, Martin County, MN, Redwood County, MN, Watonwan County, MN

The radar

The Sioux Falls radar (KFSD), 115 km from the middle of the area, began a volume at 01:13 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 16, 8:12 PM CDT	Thunderstorm Wind 69 M	Lakefield, MN
Apr 16, 8:25 PM CDT	Thunderstorm Wind 61 E	Storden, MN	Thunderstorm winds blew the roof off a vehicle repair shop. The roof knocked down power lines when it fell, causing a power outage.
Apr 16, 8:45 PM CDT	Thunderstorm Wind 55 E	Dunnell, MN	Shingles off roof. Large tree limbs 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
Apr 16, 5:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.2 hours before the alert went out and 211 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: 1904 J/kg
Mixed-layer CIN: -135 J/kg
Mixed-layer LCL: 1836 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 225 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 170112
SVRMSP
MNC015-091-127-165-170200-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
809 PM CDT TUE APR 16 2002

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  REDWOOD COUNTY IN SOUTHWEST MINNESOTA
  BROWN COUNTY IN SOUTH CENTRAL MINNESOTA
  WATONWAN COUNTY IN SOUTH CENTRAL MINNESOTA
  MARTIN COUNTY IN SOUTH CENTRAL MINNESOTA

* UNTIL 900 PM CDT

* AT 809 PM CDT...RADAR INDICATED A LINE OF STRONG THUNDERSTORMS 
WITH DAMAGING WINDS ALONG A LINE EXTENDING FROM MARSHALL TO SLAYTON
TO WORTHINGTON.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  SPRINGFIELD 
  WABASSO
  ST JAMES
  FAIRMONT

THESE ARE DANGEROUS STORMS WITH DAMAGING WINDS...STAY INDOORS AWAY 
FROM WINDOWS.

LAT...LON 4432 9597 4284 9499 4208 9577 4251 9505
          4326 9425 4458 9526

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 16, 7:16 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Yellow Medicine	44 min
Apr 16, 7:52 PM CDT	Severe Thunderstorm Warning	MPX	Pope, Swift	53 min
Apr 16, 8:15 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Renville	60 min
Apr 16, 8:34 PM CDT	Severe Thunderstorm Warning	MPX	Stearns, Todd	56 min
Apr 16, 9:36 PM CDT	Severe Thunderstorm Warning	MPX	Meeker, Stearns, Wright	39 min
Apr 16, 9:44 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Morrison	31 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.