Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 160, NWS Twin Cities, MN

July 18, 1997Blue Earth County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 18, 1997, 7:53 AM CDT for Blue Earth County, Minnesota. It was in force for 47 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 18, 1997, 7:53 AM CDT (12:53 UTC)
Expired: Jul 18, 1997, 8:40 AM CDT
In force: 47 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Blue Earth County, MN

The radar

The Minneapolis radar (KMPX), 99 km from the middle of the area, began a volume at 12:56 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 18, 7:55 AM CDT	Hail 1.75	Mankato, MN
Jul 18, 8:02 AM CDT	Hail 0.75	Mankato, 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.

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 18, 5:15 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 0.9 hours before the alert went out and 98 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: 1023 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 1061 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 181254 RRA
SVRMSP
MNC013-181340-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
753 AM CDT FRI JUL 18 1997

* SEVERE THUNDERSTORM WARNING FOR
  BLUE EARTH COUNTY - SOUTH CENTRAL MINNESOTA

* UNTIL 840 AM CDT
 
* SOME LOCATIONS AFFECTED
    MANKATO
    EAGLE LAKE
    ST. CLAIR
    BEAUFORD

* AT 750 AM CDT DOPPLER RADAR INDICATED A SEVERE STORM WITH LARGE
  HAIL NEAR MANKATO.  THE STORMf WAS MOVING EAST TO SOUTHEAST AT 30
  MPH. A TV METEOROLOGIST REPORTED 1 INCH HAIL IN MANKATO AT 750 AM.

THIS IS A DANGEROUS STORM...WITH LARGE HAIL.  STAY INDOORS AWAY
FROM WINDOWS.


MBK

 
&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 4:49 AM CDT	Severe Thunderstorm Warning	MPX	Yellow Medicine	61 min
Jul 18, 5:05 AM CDT	Severe Thunderstorm Warning	MPX	Lac qui Parle	60 min
Jul 18, 8:03 AM CDT	Severe Thunderstorm Warning	MPX	Waseca	32 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1997 Every severe thunderstorm warning in 1997

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.