Alert archive / Wisconsin / Tornado Warnings in 1999

Tornado Warning 13, NWS Twin Cities, MN

July 9, 1999Polk County, Wisconsin; Chisago County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Jul 9, 1999, 12:42 PM CDT for Polk County, Wisconsin; Chisago County, Minnesota. It was in force for 33 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 9, 1999, 12:42 PM CDT (17:42 UTC)
Expired: Jul 9, 1999, 1:15 PM CDT
In force: 33 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Chisago County, MN, Polk County, WI

The radar

The Minneapolis radar (KMPX), 99 km from the middle of the area, began a volume at 17:44 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 9, 12:45 PM CDT	Tornado F0	Palmdale, MN	A few trees down.
Jul 9, 12:52 PM CDT	Tornado F0	Balsam Lake, WI	Few trees and power lines down along six blocks in Balsam Lake. Pole barn down on the east side of Balsam Lake.

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 12:00Z, 5.7 hours before the alert went out and 101 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1951 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: -56 m²/s²
0-3 km storm-relative helicity: -22 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 
TTAA00 KMSP 091743 RRA
TORMSP
MNC025-WIC095-091815-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1242 PM CDT FRI JUL 9 1999

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

* TORNADO WARNING FOR...
  SOUTHERN CHISAGO COUNTY IN EAST CENTRAL MINNESOTA
  POLK COUNTY IN NORTHWESTERN WISCONSIN

* UNTIL 115 PM CDT

* AT 1238 PM CDT...LAW ENFORCEMENT REPORTED HAS REPORTED 2 OR 3
  TORNADOES FROM STORMS SCATTERED IN A LINE FROM NORTH BRANCH TO
  BALSAM LAKE.  THE STORMS WERE MOVING EAST TO SOUTHEAST AT
  25 MPH.

* SOME LOCATIONS AFFECTED
  LINDSTROM
  CENTER CITY
  ST CROIX FALLS
  OSCEOLA
  DRESSER

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


&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 1:05 PM CDT	Tornado Warning	MPX	Barron	30 min
Jul 9, 1:12 PM CDT	Tornado Warning	MPX	Chisago, Isanti	33 min

Nearby

Tornado Warnings in Wisconsin, 1999 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.