Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 9, NWS Twin Cities, MN

May 13, 1987Mille Lacs County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 13, 1987, 7:05 PM CDT for Mille Lacs County, Minnesota. It was in force for 55 min. 1 report 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: May 13, 1987, 7:05 PM CDT (00:05 UTC)
Expired: May 13, 1987, 8:00 PM CDT
In force: 55 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Mille Lacs 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
May 13, 7:20 PM CDT	Hail 0.75	Mille Lacs, 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 00:00Z, 0.1 hours before the alert went out and 121 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: 732 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1878 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTC 140009
SVRSTC
MNC095-140100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST CLOUD MN
705 PM CDT WED MAY 13 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 800 PM CDT FOR PEOPLE IN THE FOLLOWING
COUNTY OF

CENTRAL MINNESOTA...SOUTHERN MILLE LACS INCLUDING THE CITY OF MILACA.

AT 700 PM RADAR SHOWED A SEVERE THUNDERSTORM ALONG THE BENTON COUNTY/
MILLE LACS COUNTY LINE IN CENTRAL MINNESOTA...25 MILES NORTHEAST OF
ST. CLOUD.

THIS SEVERE THUNDERSTORM WAS MOVING EAST AT 30 MILES AN HOUR.  

REMEMBER SEVERE THUNDERSTORMS PRODUCE STRONG DAMAGING WINDS..LARGE
HAIL AND FREQUENT LIGHTNING STRIKES. ALSO SEVERE THUNDER4STORMS CAN
AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE
WARNING..SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO A PLACE OF
SAFETY IF ONE IS SPOTTED.

NISTLER/FRASER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 13, 7:05 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Scott, Sibley	55 min
May 13, 7:34 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Hennepin	36 min
May 13, 7:47 PM CDT	Tornado Warning	MPX	Dakota	33 min
May 13, 7:50 PM CDT	Tornado Warning	MPX	Goodhue	40 min
May 13, 8:08 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Le Sueur	37 min
May 13, 8:08 PM CDT	Severe Thunderstorm Warning	MPX	Rice	37 min
May 13, 8:37 PM CDT	Severe Thunderstorm Warning	MPX	Dodge, Goodhue, Steele	38 min
May 13, 8:37 PM CDT	Severe Thunderstorm Warning	MPX	Waseca	38 min
May 13, 9:40 PM CDT	Severe Thunderstorm Warning	MPX	Dodge, Olmsted	50 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1987 Every severe thunderstorm warning in 1987

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.