Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 61, NWS Duluth, MN

July 17, 2001Cass County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 17, 2001, 9:16 PM CDT for Cass County, Minnesota. It was in force for 59 min. 5 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 17, 2001, 9:16 PM CDT (02:16 UTC)
Expired: Jul 17, 2001, 10:15 PM CDT
In force: 59 min
Issued by: NWS Duluth, MN
Area: Whole counties

County Cass County, MN

The radar

The Duluth radar (KDLH), 161 km from the middle of the area, began a volume at 02:15 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 17, 9:23 PM CDT	Hail 0.75	Walker, MN
Jul 17, 9:35 PM CDT	Hail 1.75	Bena, MN
Jul 17, 9:35 PM CDT	Thunderstorm Wind 52 M	Bena, MN
Jul 17, 10:13 PM CDT	Thunderstorm Wind 52 M	Remer, MN
Jul 17, 10:25 PM CDT	Thunderstorm Wind 52 M	Remer, MN	Six inch diameter trees were blown down on State Highway 6.

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 17, 7:00 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 2.3 hours before the alert went out and 196 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: 2282 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 878 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.0

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 17, 3:15 PM CDT, 6 hours 1 minute earlier.

Area forecast discussion, Jul 17, 3:15 PM CDT, 6 hours 1 minute before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DULUTH MN
315 PM CDT TUE JUL 17 2001

LITTLE CHANGE IN ON-GOING FORECAST SCHEME WITH SCATTERED
THUNDERSTORMS EXPECTED THROUGH THE PERIOD IN UNSTABLE ATMOSPHERE. NO
REAL BIG KICKER IN THE WORKS...SOME S/WVS COMING OVER TOP OF SLOWLY
WEAKENING RIDGE...BUT NOTHING THAT MODELS CAN REALLY AGREE ON. WHAT
CAN BE AGREED UPON IS CONTINUED WARM AND HUMID WEATHER PATTERN TO
WITH SOME RESPITE FOUND NEAR THE SHORES OF LAKE SUPERIOR. COLD FRONT
COMING THROUGH ON THURSDAY AFTERNOON/EVENING. ETA FASTEST WITH THIS
FEATURE...BUT TOO FAR AHEAD TO PIN DOWN MORE PRECISE TIMING.
FOLLOWED GENERAL FORECAST NUMBERS.

.DLH...NONE.

CLC

In the hours before

Local storm report, Jul 17, 8:41 PM CDT, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH, MN
841 PM CDT TUE JUL 17 2001

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

0520 PM    CASS LAKE                 MN   .75 INCH HAIL
07/17/01   CASS

0728 PM    NORTHOME                  MN   1.00 INCH HAIL
07/17/01   KOOCHICHING

0825 PM    PILLAGER                  MNt   60 MPH TSTM WIND GUST
07/17/01   CASS

0825 PM    LAKESHORE                 MN   60 MPH TSTM WIND GUST
07/17/01   CASS

DLT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 7:03 PM CDT	Tornado Warning	DLH	Itasca, Koochiching	42 min
Jul 17, 7:45 PM CDT	Tornado Warning	DLH	Cass	45 min
Jul 17, 8:29 PM CDT	Tornado Warning	DLH	Cass	31 min
Jul 17, 8:45 PM CDT	Severe Thunderstorm Warning	DLH	Crow Wing	30 min
Jul 17, 9:34 PM CDT	Severe Thunderstorm Warning	DLH	Crow Wing	56 min
Jul 17, 9:53 PM CDT	Tornado Warning	DLH	Cass	52 min
Jul 17, 10:24 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin	66 min
Jul 17, 10:49 PM CDT	Severe Thunderstorm Warning	DLH	Pine	56 min
Jul 17, 11:26 PM CDT	Severe Thunderstorm Warning	DLH	Burnett	64 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2001 Every severe thunderstorm warning in 2001

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.