Alert archive / Minnesota / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 97, NWS Twin Cities, MN

May 9, 2004Sibley County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 9, 2004, 6:32 PM CDT for Sibley County, Minnesota. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 9, 2004, 6:32 PM CDT (23:32 UTC)
Expired
May 9, 2004, 7:30 PM CDT
In force
58 min
Issued by
NWS Twin Cities, MN
Area
Counties, with a storm outline in the text

County Sibley County, MN

The radar

The Minneapolis radar (KMPX), 45 km from the middle of the area, began a volume at 23:33 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.

The watch it was issued in

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

IssuedProductOfficeLasted
May 9, 3:55 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.5 hours before the alert went out and 43 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 12:00Z on 2004-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 8 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2004-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 207 square meters per square second.19395878Sfc1 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
8 J/kg
Mixed-layer CIN
-483 J/kg
Mixed-layer LCL
802 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
207 m²/s²
0-3 km storm-relative helicity
170 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 092332
SVRMPX
MNC143-100030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
630 PM CDT SUN MAY 9 2004

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SIBLEY COUNTY IN CENTRAL MINNESOTA

* UNTIL 730 PM CDT

* AT 629 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING LARGE HAIL. THIS STORM WAS LOCATED NEAR
  ARLINGTON...OR ABOUT 10 MILES NORTHEAST OF GAYLORD.  IT WAS
  MOVING EAST AT 20 MPH. OTHER STORMS MAY ALSO REDEVELOP BEHIND
  THIS STORM OVER SIBLEY COUNTY.

* LOCATIONS IMPACTED INCLUDE...
  ARLINGTON.
  GREEN ISLE.
  HENDERSON.

VERY HEAVY RAIN WILL ALSO PRODUCE POOR VISIBILITY AND PONDING OF 
WATER AT INTERSECTIONS.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

LAT...LON 4471 9424 4447 9422 4448 9393 4460 9392
          4465 9381 4471 9393

$$
TDK

The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 11:04 AM CDTSevere Thunderstorm WarningMPXYellow Medicine56 min
May 9, 1:53 PM CDTSevere Thunderstorm WarningMPXPope, Stevens67 min
May 9, 2:31 PM CDTSevere Thunderstorm WarningMPXSwift59 min
May 9, 2:59 PM CDTSevere Thunderstorm WarningMPXPope31 min
May 9, 3:21 PM CDTSevere Thunderstorm WarningMPXKandiyohi, Stearns54 min
May 9, 3:29 PM CDTSevere Thunderstorm WarningMPXSwift31 min
May 9, 3:31 PM CDTTornado WarningMPXKandiyohi29 min
May 9, 3:51 PM CDTSevere Thunderstorm WarningMPXSherburne, Wright54 min
May 9, 3:59 PM CDTTornado WarningMPXKandiyohi31 min
May 9, 4:05 PM CDTSevere Thunderstorm WarningMPXMeeker, Stearns55 min
May 9, 4:13 PM CDTTornado WarningMPXMeeker, Stearns47 min
May 9, 4:40 PM CDTSevere Thunderstorm WarningMPXCarver, Hennepin, Wright65 min
May 9, 4:49 PM CDTTornado WarningMPXAnoka, Sherburne, Wright26 min
May 9, 4:58 PM CDTSevere Thunderstorm WarningMPXMcLeod47 min
May 9, 5:11 PM CDTTornado WarningMPXCarver, Hennepin49 min
May 9, 5:18 PM CDTSevere Thunderstorm WarningMPXAnoka42 min
May 9, 5:26 PM CDTSevere Thunderstorm WarningMPXChisago, Isanti64 min
May 9, 5:46 PM CDTSevere Thunderstorm WarningMPXSibley44 min
May 9, 5:47 PM CDTSevere Thunderstorm WarningMPXRamsey, Washington58 min
May 9, 5:48 PM CDTSevere Thunderstorm WarningMPXMcLeod42 min
May 9, 6:18 PM CDTSevere Thunderstorm WarningMPXDakota, Scott57 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2004Every severe thunderstorm warning in 2004

Sources

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