Alert archive / Minnesota / Tornado Warnings in 1989

Tornado Warning 9, NWS Twin Cities, MN

August 31, 1989Hennepin County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Aug 31, 1989, 3:55 PM CDT for Hennepin County, Minnesota. It was in force for 35 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: Aug 31, 1989, 3:55 PM CDT (20:55 UTC)
Expired: Aug 31, 1989, 4:30 PM CDT
In force: 35 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Hennepin County, MN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Aug 31, 4:15 PM CDT	Hail 1.75	Hennepin, MN
Aug 31, 4:32 PM CDT	Hail 1.5	Hennepin, MN

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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 8.9 hours before the alert went out and 20 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: 856 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 248 m²/s²
0-3 km storm-relative helicity: 247 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 312057
TORMSP
MNC053-312130-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
355 PM CDT THU AUG 31 1989
 
THE NATIONAL WEATHER SERVICE IN MINNEAPOLIS HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  430 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN EAST CENTRAL MINNESOTA
          ...NORTHERN HENNEPIN
 
AT 355 PM RADAR INDICATED A POSSIBLE TORNADO IN NORTHERN HENNIPEN
COUNTY NEAR HANOVER ABOUT 25 MILES WEST OF DOWNTOWN MINNESPOLIS.
ROGERS..MAPLE GROVE AND OSSEO ARE IN THE PATH OF THIS POSSIBLE
TORNADO.
 
BASEBALL HAIL WAS REPORTED AT ST MICHEAL IN EASTERN WRIGHT COUNTY.
 
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR.  USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.
 
THIS IS A DANGEROUS STORM SITUATION.  ACT QUICKLY.  IF YOU ARE
IN THE PATH OF THIS TORNADO MOVE TO A SHELTER BELOW GROUND IF
AVAILABLE.  OTHERWISE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST
FLOOR POSSIBLE.  AVOID WINDOWS.  ABANDON CARS AND MOBILE HOMES
FOR A REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 10:21 AM CDT	Severe Thunderstorm Warning	MPX	Morrison, Todd	39 min
Aug 31, 10:21 AM CDT	Severe Thunderstorm Warning	MPX	Stearns	54 min
Aug 31, 11:53 AM CDT	Severe Thunderstorm Warning	MPX	Pope	37 min
Aug 31, 2:39 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Stearns	21 min
Aug 31, 2:39 PM CDT	Severe Thunderstorm Warning	MPX	Sherburne	51 min
Aug 31, 3:18 PM CDT	Severe Thunderstorm Warning	MPX	Wright	42 min
Aug 31, 3:35 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Hennepin	55 min
Aug 31, 4:08 PM CDT	Severe Thunderstorm Warning	MPX	Chisago, Washington	67 min
Aug 31, 4:27 PM CDT	Tornado Warning	MPX	Hennepin	33 min
Aug 31, 4:59 PM CDT	Severe Thunderstorm Warning	MPX	Hennepin	31 min
Aug 31, 4:59 PM CDT	Severe Thunderstorm Warning	MPX	Ramsey	36 min

Nearby

Tornado Warnings in Minnesota, 1989 Every tornado warning in 1989 Tornadoes in 1989

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.