Alert archive / Minnesota / Tornado Warnings in 1999

Tornado Warning 17, NWS Twin Cities, MN

July 25, 1999Benton County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Jul 25, 1999, 8:45 PM CDT for Benton County, Minnesota. It was in force for 30 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
Jul 25, 1999, 8:45 PM CDT (01:45 UTC)
Expired
Jul 25, 1999, 9:15 PM CDT
In force
30 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Benton County, MN

The watch it was issued in

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

IssuedProductOfficeLasted
Jul 25, 6:45 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.8 hours before the alert went out and 99 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 1999-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2267 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 00:00Z on 1999-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 169 square meters per square second.193958Sfc1 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
2267 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
1657 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
169 m²/s²
0-3 km storm-relative helicity
200 m²/s²
Significant tornado parameter
0.6
Supercell composite
6.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMPX 260149
TORMSP
MNC009-260215-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
845 PM CDT SUN JUL 25 1999

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  BENTON COUNTY IN CENTRAL MINNESOTA

* UNTIL 915 PM CDT

* AT 845 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  POSSIBLE TORNADO 11 MILES WEST OF FOLEY...OR ABOUT 6 MILES NORTH OF
  ST CLOUD...MOVING EAST AT 20 MPH.

* SOME LOCATIONS IN THE PATH OF THIS TORNADO INCLUDE...  
  RONNEBY
  GILMAN
  FOLEY
  POPPLE CREEK

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING WHICH
WAS IN EFFECT FOR THE SAME AREA.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 7:32 PM CDTSevere Thunderstorm WarningMPXDouglas, Pope43 min
Jul 25, 7:38 PM CDTSevere Thunderstorm WarningMPXBenton, Morrison, Stearns52 min
Jul 25, 8:28 PM CDTSevere Thunderstorm WarningMPXBenton, Stearns47 min
Jul 25, 8:41 PM CDTSevere Thunderstorm WarningMPXKanabec, Mille Lacs49 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.