Alert archive / Minnesota / Tornado Warnings in 1999

Tornado Warning 20, NWS Twin Cities, MN

July 30, 1999Scott County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Jul 30, 1999, 6:05 PM CDT for Scott County, Minnesota. It was in force for 25 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 30, 1999, 6:05 PM CDT (23:05 UTC)
Expired: Jul 30, 1999, 6:30 PM CDT
In force: 25 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Scott County, MN

The radar

The Minneapolis radar (KMPX), 22 km from the middle of the area, began a volume at 22:51 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

Time	Report	Where	Remark
Jul 30, 6:09 PM CDT	Tornado F1	Belle Plaine, MN	Roofs partially taken off two downtown businesses. Few trees down.
Jul 30, 6:20 PM CDT	Tornado F0	Lydia, MN	Mostly touched down in open field near Hwy 13 and Co. Road 10, though a few trees and power lines were felled.

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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 30, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.1 hours before the alert went out and 23 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: 4710 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 1115 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 302309
TORMSP
MNC139-302330-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
605 PM CDT FRI JUL 30 1999

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

* TORNADO WARNING FOR...
  SCOTT COUNTY IN SOUTH CENTRAL MINNESOTA

* UNTIL 630 PM CDT

* AT 603 PM CDT...SEVERE WEATHER SPOTTERS REPORTED A TORNADO NEAR
BELLE PLAINE...OR ABOUT 30 MILES SOUTHWEST OF DOWNTOWN MINNEAPOLIS.
THE LTORNADO WAS MOVING TOWARD THE EAST AT 25 MPH.

* SOME LOCATIONS AFFECTED
  JORDAN
  BELLE PLAINE


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.

Issued	Product	Office	Counties	Lasted
Jul 30, 2:10 PM CDT	Severe Thunderstorm Warning	MPX	Pope, Stearns	50 min
Jul 30, 2:16 PM CDT	Severe Thunderstorm Warning	MPX	Swift	44 min
Jul 30, 2:17 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Morrison	43 min
Jul 30, 2:22 PM CDT	Severe Thunderstorm Warning	MPX	Mille Lacs	38 min
Jul 30, 2:23 PM CDT	Tornado Warning	MPX	Stearns	37 min
Jul 30, 2:38 PM CDT	Severe Thunderstorm Warning	MPX	Lac qui Parle, Yellow Medicine	52 min
Jul 30, 2:55 PM CDT	Tornado Warning	MPX	Benton, Stearns	35 min
Jul 30, 3:00 PM CDT	Severe Thunderstorm Warning	MPX	Mille Lacs, Morrison	45 min
Jul 30, 3:04 PM CDT	Severe Thunderstorm Warning	MPX	Stearns	41 min
Jul 30, 3:14 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec	31 min
Jul 30, 3:17 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Swift	58 min
Jul 30, 3:30 PM CDT	Severe Thunderstorm Warning	MPX	Lac qui Parle, Yellow Medicine	45 min
Jul 30, 3:36 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Stearns	39 min
Jul 30, 3:45 PM CDT	Severe Thunderstorm Warning	MPX	Mille Lacs, Morrison	30 min
Jul 30, 3:45 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec	30 min
Jul 30, 3:54 PM CDT	Severe Thunderstorm Warning	MPX	Sherburne	66 min
Jul 30, 4:13 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Renville	47 min
Jul 30, 4:13 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec, Mille Lacs	47 min
Jul 30, 4:13 PM CDT	Severe Thunderstorm Warning	MPX	Benton	47 min
Jul 30, 4:13 PM CDT	Severe Thunderstorm Warning	MPX	Meeker, Wright	47 min
Jul 30, 4:43 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Hennepin	62 min
Jul 30, 4:43 PM CDT	Severe Thunderstorm Warning	MPX	Isanti	62 min
Jul 30, 4:59 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec	61 min
Jul 30, 4:59 PM CDT	Severe Thunderstorm Warning	MPX	Carver	61 min
Jul 30, 5:07 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Renville, Sibley	53 min
Jul 30, 5:34 PM CDT	Severe Thunderstorm Warning	MPX	Chisago	56 min
Jul 30, 5:59 PM CDT	Severe Thunderstorm Warning	MPX	Sibley	31 min
Jul 30, 6:11 PM CDT	Tornado Warning	MPX	Carver	34 min
Jul 30, 6:25 PM CDT	Tornado Warning	MPX	Scott	35 min
Jul 30, 6:41 PM CDT	Severe Thunderstorm Warning	MPX	Dakota	49 min
Jul 30, 6:47 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn	43 min
Jul 30, 6:58 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	47 min

Nearby

Tornado Warnings in Minnesota, 1999 Every tornado warning in 1999 Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.