Alert archive / Minnesota / Tornado Warnings in 1999

Tornado Warning 23, NWS Twin Cities, MN

August 9, 1999Le Sueur County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Aug 9, 1999, 6:39 PM CDT for Le Sueur County, Minnesota. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 9, 1999, 6:39 PM CDT (23:39 UTC)
Expired
Aug 9, 1999, 7:15 PM CDT
In force
36 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Le Sueur County, MN

The watch it was issued in

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

IssuedProductOfficeLasted
Aug 9, 6:30 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.7 hours before the alert went out and 54 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 1999-08-09Temperature 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 12:00Z on 1999-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1057 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
199 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.

676 
WFUS1 KMSP 092340 RRA
TORMSP
MNC079-100015-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
639 PM CDT MON AUG 9 1999

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES/CHANHASSEN HAS
ISSUED A

* TORNADO WARNING FOR...
  LE SUEUR COUNTY IN SOUTH CENTRAL MINNESOTA

* UNTIL 715 PM CDT

* AT 639 PM CDT...LAW ENFORCEMENT REPORTED A DEVELOPING TORNADO JUST
  EAST OF ST PETER.  THE STORM WAS MOVING EAST AT 35 MPH.

* SOME LOCATIONS AFFECTED
  CLEVELAND
  LE CENTER
  KASOTA
  KILKENNY
  ELYSIAN


GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR



&

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 1:31 AM CDTSevere Thunderstorm WarningMPXStevens59 min
Aug 9, 2:24 AM CDTSevere Thunderstorm WarningMPXStevens, Swift66 min
Aug 9, 2:51 AM CDTSevere Thunderstorm WarningMPXChippewa54 min
Aug 9, 8:34 AM CDTSevere Thunderstorm WarningMPXWatonwan41 min
Aug 9, 8:38 AM CDTSevere Thunderstorm WarningMPXBrown, Nicollet52 min
Aug 9, 8:55 AM CDTSevere Thunderstorm WarningMPXBlue Earth45 min

Nearby

Tornado Warnings in Minnesota, 1999Every tornado warning in 1999Tornadoes in 1999

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.