Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 175, NWS Twin Cities, MN

July 17, 2001Benton County, Mille Lacs County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 17, 2001, 10:25 PM CDT for Benton County, Mille Lacs County, Minnesota. It was in force for 50 min. 2 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Jul 17, 2001, 10:25 PM CDT (03:25 UTC)
Expired: Jul 17, 2001, 11:15 PM CDT
In force: 50 min
Issued by: NWS Twin Cities, MN
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Benton County, MN, Mille Lacs County, MN

The radar

The Minneapolis radar (KMPX), 125 km from the middle of the area, began a volume at 03:28 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, 10:30 PM CDT	Thunderstorm Wind 50 E	Rum River, MN	A few trees down.
Jul 17, 10:30 PM CDT	Hail 0.75	Page, 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 17, 7:00 PM CDT	Tornado Watch	SPC	5 hr
Jul 17, 9:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.4 hours before the alert went out and 124 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: 4439 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1233 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.8

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 180327
SVRMSP

MNC009-095-180415-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1025 PM CDT TUE JUL 17 2001

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BENTON COUNTY IN MINNESOTA
  MILLE LACS COUNTY IN MINNESOTA
  
* UNTIL 1115 PM CDT

* AT 1025 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE
  HAIL AND DAMAGING WINDS ALONG A LINE EXTENDING FROM 3 MILES NORTH
  OF ONAMIA TO 10 MILES NORTH OF RONNEBY...OR ALONG A LINE EXTENDING
  FROM 24 MILES NORTHWEST OF MORA TO 13 MILES WEST OF MILACA...MOVING
  SOUTHEAST AT 20 MPH.  

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  ONAMIA.
  MILACA.
  FOLEY.
  LAKE MILLE LACS.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER...
SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

LAT...LON 4622 9376 4581 9398 4554 9392 4577 9354
          4623 9346

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 8:10 PM CDT	Severe Thunderstorm Warning	MPX	Morrison	35 min
Jul 17, 8:37 PM CDT	Tornado Warning	MPX	Morrison	23 min
Jul 17, 8:57 PM CDT	Severe Thunderstorm Warning	MPX	Morrison	48 min
Jul 17, 10:05 PM CDT	Severe Thunderstorm Warning	MPX	Douglas, Todd	40 min
Jul 17, 10:31 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec	44 min
Jul 18, 12:55 AM CDT	Severe Thunderstorm Warning	MPX	Wright	50 min
Jul 18, 1:11 AM CDT	Severe Thunderstorm Warning	MPX	Carver	49 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.