Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 44, NWS Duluth, MN

July 16, 1997Koochiching County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 16, 1997, 7:35 PM CDT for Koochiching County, Minnesota. It was in force for 55 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 16, 1997, 7:35 PM CDT (00:35 UTC)
Expired: Jul 16, 1997, 8:30 PM CDT
In force: 55 min
Issued by: NWS Duluth, MN
Area: Whole counties

County Koochiching County, MN

The radar

The Duluth radar (KDLH), 196 km from the middle of the area, began a volume at 00:35 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.6 hours before the alert went out and 378 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: 2132 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 1981 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Duluth, MN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 16, 2:35 PM CDT, 5 hours earlier.

Area forecast discussion, Jul 16, 2:35 PM CDT, 5 hours before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DULUTH MN
230 PM CDT WED JUL 16 1997

PROBLEM OVERNIGHT WILL BE THUNDERSTORMS.

CONVECTION FIRED IN NORTHWEST WISCONSIN EARLIER THIS AFTERNOON
ALONG A WEAK SFC BOUNDARY AND WAS AIDED BY A VORT TAIL THAT
HAS SINCE MOVED EAST. THERE ALSO APPEARS TO BE A DEWPOINT BOUNDARY IN
NORTHWEST WISCONSIN. AIR AT THE SFC IS QUITE JUICY WITH DEWPOINTS
IN THE LOWER 60S IN NORTHERN MINNESOTA AND IN THE LOWER 70S IN
NORTHWEST WI.

MOST OF CONVECTION AS MOVED OUT OF THE AREA BUT ETA SHOWS CONFLUENT
FLOW FROM THE SURFACE TO H7 FROM CENTRAL NORTH DAKOTA INTO CENTRAL
MINNESOTA. THIS ACTING TO TIGHTEN TEMPERATURE GRADIENT AND IS
RESULTING IN FROTOGENESIS. FEEL NORTHWEST CWA...INL...CDD...WILL
SEE A CHANCE FOR THUNDERSTORMS THROUGH ABOUT MIDNIGHT...WITH A BETTER
CHANCE ACROSS NW WI AND FM BRD TO HINCKLEY. A H5 VORT MAX WILL
MOVE SOUTHEAST ACROSS MINNESOTA TONIGHT AIDING IN CONVECTION.
NORTHWEST WISCONSIN S6HOULD ALSO HAVE OLD CONVECTIVE BOUNDARIES
AROUND FROM EARLIER CONVECTION TO INCREASE THEIR CHANCES.

AS FOR TEMPERATURES...FWC GUIDANCE LOOKS PRETTY GOOD EXCEPT I
THINK INL AND ARROWHEAD WILL BE AROUND 60.

MELDE

In the hours before

Local storm report, Jul 16, 3:06 PM CDT, 4 hours 29 minutes before

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Local storm report, Jul 16, 3:07 PM CDT, 4 hours 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  DULUTH MN
307 PM CDT WED JUL 16 1997

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0823 AM    5 S GORDON                WI   1.50 INCH HAIL
07/16/97   DOUGLAS

1115 AM    GLIDDEN                   WI   0.75 INCH HAIL
07/16/97   ASHLAND

1215 PM    20 NE PARK FALLS          WI   0.75 INCH HAIL
07/16/97   IRON

EJS

Special weather statement, Jul 16, 5:51 PM CDT, 1 hour 44 minutes before

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Special weather statement, Jul 16, 5:52 PM CDT, 1 hour 43 minutes before

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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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.