Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 171, NWS Twin Cities, MN

July 21, 2002Douglas County, Pope County, Todd County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 21, 2002, 7:04 AM CDT for Douglas County, Pope County, Todd County, Minnesota. It was in force for 41 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 21, 2002, 7:04 AM CDT (12:04 UTC)
Expired: Jul 21, 2002, 7:45 AM CDT
In force: 41 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Douglas County, MN, Pope County, MN, Todd County, MN

What was reported inside it

Time	Report	Where	Remark
Jul 21, 7:09 AM CDT	Thunderstorm Wind 52 E	Alexandria, MN	Trees down.
Jul 21, 7:35 AM CDT	Thunderstorm Wind 52 E	Long Prairie, MN	Few trees toppled.

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 12:00Z, 0.1 hours before the alert went out and 176 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: 2410 J/kg
Mixed-layer CIN: -202 J/kg
Mixed-layer LCL: 1319 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 94 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.

345 
WUUS53 KMPX 211204
SVRMSP
MNC041-121-153-211245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
702 AM CDT SUN JUL 21 2002

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  TODD COUNTY IN CENTRAL MINNESOTA
  DOUGLAS COUNTY IN WEST CENTRAL MINNESOTA
  POPE COUNTY IN WEST CENTRAL MINNESOTA

* UNTIL 745 AM CDT

* AT 702 AM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM
  MILLERVILLE TO GLENWOOD...MOVING NORTHEAST AT 50 MPH. DAMAGING     
  WINDS HAVE BEEN REPORTED WITH THESE STORMS. 

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  ALEXANDRIA.
  GLENWOOD.
  LONG PRAIRIE.

THIS IS A DANGEROUS STORM WITH DAMAGING WINDS...STAY INDOORS AWAY
FROM WINDOWS.

LAT...LON 4608 9574 4543 9572 4545 9518 4575 9514
          4582 9469 4634 9469 4633 9522

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 11:07 PM CDT	Severe Thunderstorm Warning	MPX	Mille Lacs	38 min
Jul 21, 7:32 AM CDT	Severe Thunderstorm Warning	MPX	Morrison	58 min
Jul 21, 7:45 AM CDT	Severe Thunderstorm Warning	MPX	Todd	30 min
Jul 21, 2:53 PM CDT	Flash Flood Warning	MPX	Anoka, Hennepin, Wright	3 hr
Jul 21, 5:00 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn	45 min
Jul 21, 5:32 PM CDT	Severe Thunderstorm Warning	MPX	Martin	43 min
Jul 21, 5:48 PM CDT	Flash Flood Warning	MPX	Freeborn	3 hr
Jul 21, 6:00 PM CDT	Flash Flood Warning	MPX	Faribault, Martin	3 hr
Jul 21, 6:20 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Martin	40 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.