Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 11, NWS Twin Cities, MN

April 18, 2002Blue Earth County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 18, 2002, 12:56 AM CDT for Blue Earth County, Minnesota. It was in force for 34 min. 1 report 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 18, 2002, 12:56 AM CDT (05:56 UTC)
Expired
Apr 18, 2002, 1:30 AM CDT
In force
34 min
Issued by
NWS Twin Cities, MN
Area
Counties, with a storm outline in the text

County Blue Earth County, MN

The radar

The Minneapolis radar (KMPX), 91 km from the middle of the area, began a volume at 06:09 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

TimeReportWhereRemark
Apr 18, 1:05 AM CDTHail 0.75Mankato, 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, 5.9 hours before the alert went out and 90 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2002-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2002-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 7 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2104 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
7 m²/s²
0-3 km storm-relative helicity
146 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 180556
SVRMSP
MNC013-180630-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1256 AM CDT THU APR 18 2002

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BLUE EARTH COUNTY IN SOUTH CENTRAL MINNESOTA

* UNTIL 130 AM CDT

* AT 1256 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE
  HAIL OVER GOOD THUNDER...OR ABOUT 11 MILES SOUTH OF MANKATO...
  MOVING NORTHEAST AT 50 MPH.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  EAGLE LAKE.
  GOOD THUNDER.
  MADISON LAKE.
  MANKATO.
  SKYLINE.
  ST CLAIR.

LAT...LON 4404 9421 4394 9386 4422 9379 4423 9399

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 18, 12:37 AM CDTSevere Thunderstorm WarningMPXChippewa23 min
Apr 18, 12:50 AM CDTSevere Thunderstorm WarningMPXKandiyohi40 min
Apr 18, 1:12 AM CDTSevere Thunderstorm WarningMPXYellow Medicine18 min
Apr 18, 1:20 AM CDTSevere Thunderstorm WarningMPXStearns25 min
Apr 18, 1:25 AM CDTSevere Thunderstorm WarningMPXCarver, Hennepin35 min
Apr 18, 1:29 AM CDTSevere Thunderstorm WarningMPXMcLeod, Renville, Sibley31 min
Apr 18, 1:34 AM CDTSevere Thunderstorm WarningMPXWright26 min
Apr 18, 1:38 AM CDTSevere Thunderstorm WarningMPXNicollet22 min
Apr 18, 1:47 AM CDTSevere Thunderstorm WarningMPXSherburne28 min
Apr 18, 1:51 AM CDTSevere Thunderstorm WarningMPXKandiyohi, Renville39 min
Apr 18, 2:00 AM CDTSevere Thunderstorm WarningMPXWright30 min
Apr 18, 2:01 AM CDTSevere Thunderstorm WarningMPXIsanti29 min
Apr 18, 2:03 AM CDTSevere Thunderstorm WarningMPXNicollet, Sibley27 min
Apr 18, 2:05 AM CDTSevere Thunderstorm WarningMPXBlue Earth, Le Sueur25 min
Apr 18, 2:08 AM CDTSevere Thunderstorm WarningMPXFaribault, Freeborn, Waseca37 min
Apr 18, 2:13 AM CDTSevere Thunderstorm WarningMPXCarver, Scott32 min
Apr 18, 2:17 AM CDTSevere Thunderstorm WarningMPXMeeker28 min
Apr 18, 2:21 AM CDTSevere Thunderstorm WarningMPXDouglas39 min
Apr 18, 2:28 AM CDTSevere Thunderstorm WarningMPXHennepin32 min
Apr 18, 2:32 AM CDTSevere Thunderstorm WarningMPXLe Sueur13 min
Apr 18, 2:37 AM CDTSevere Thunderstorm WarningMPXMcLeod, Renville23 min
Apr 18, 2:42 AM CDTSevere Thunderstorm WarningMPXCarver, Scott33 min
Apr 18, 2:48 AM CDTSevere Thunderstorm WarningMPXMeeker, Wright27 min
Apr 18, 2:58 AM CDTSevere Thunderstorm WarningMPXIsanti, Kanabec, Mille Lacs, Sherburne47 min
Apr 18, 3:01 AM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin, Ramsey44 min
Apr 18, 3:04 AM CDTSevere Thunderstorm WarningMPXDouglas, Todd41 min
Apr 18, 3:07 AM CDTSevere Thunderstorm WarningMPXMcLeod23 min
Apr 18, 3:13 AM CDTSevere Thunderstorm WarningMPXCarver47 min
Apr 18, 3:17 AM CDTSevere Thunderstorm WarningMPXDakota, Washington43 min
Apr 18, 3:19 AM CDTSevere Thunderstorm WarningMPXWright26 min
Apr 18, 3:31 AM CDTSevere Thunderstorm WarningMPXMcLeod14 min
Apr 18, 3:40 AM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin, Wright50 min
Apr 18, 3:49 AM CDTSevere Thunderstorm WarningMPXChisago, Isanti41 min
Apr 18, 3:58 AM CDTSevere Thunderstorm WarningMPXDakota, Washington32 min
Apr 18, 4:04 AM CDTSevere Thunderstorm WarningMPXRamsey26 min
Apr 18, 4:30 AM CDTSevere Thunderstorm WarningMPXWashington30 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2002Every 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.