Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 183, NWS Twin Cities, MN

July 22, 2001Chippewa County, Lac qui Parle County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 22, 2001, 9:29 PM CDT for Chippewa County, Lac qui Parle County, Minnesota. It was in force for 46 min. 3 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 22, 2001, 9:29 PM CDT (02:29 UTC)
Expired: Jul 22, 2001, 10:15 PM CDT
In force: 46 min
Issued by: NWS Twin Cities, MN
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Chippewa County, MN, Lac qui Parle County, MN

The radar

The Sioux Falls radar (KFSD), 170 km from the middle of the area, began a volume at 02:32 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 22, 9:30 PM CDT	Thunderstorm Wind 55 E	Nassau, MN	Numerous trees down in a 5 mile wide swath that included the cities of Nassau and Marietta. Some trees toppled onto houses and vehicles.
Jul 22, 9:30 PM CDT	Hail 0.75	Nassau, MN	Wind driven hail dented siding on a few houses and chipped paint on several others.
Jul 22, 9:56 PM CDT	Hail 0.75	Milan, 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 22, 6:15 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.5 hours before the alert went out and 177 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: 2747 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 1276 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 13.2

Open this sounding in Storm Lab

The text

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

649 
WUUS53 KMPX 230229
SVRMSP
MNC023-073-230315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
929 PM CDT SUN JUL 22 2001

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHIPPEWA COUNTY IN WEST CENTRAL MINNESOTA
  LAC QUI PARLE COUNTY IN WEST CENTRAL MINNESOTA

* UNTIL 1015 PM CDT

* AT 929 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES
  NORTHEAST OF MARIETTA...OR ABOUT 6 MILES NORTHWEST OF MADISON...
  MOVING EAST AT 20 MPH.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  WATSON.
  NASSAU.
  MONTEVIDEO.
  MILAN.
  MARIETTA.
  MADISON.
  BELLINGHAM.

THIS IS A DANGEROUS STORM...STAY INDOORS AWAY FROM WINDOWS. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

LAT...LON 4514 9646 4496 9645 4492 9562 4515 9580

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 1:48 AM CDT	Severe Thunderstorm Warning	MPX	Stevens, Swift	42 min
Jul 23, 2:29 AM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Pope, Stearns, Swift	61 min
Jul 23, 3:13 AM CDT	Severe Thunderstorm Warning	MPX	Meeker, Stearns	47 min
Jul 23, 5:11 AM CDT	Severe Thunderstorm Warning	MPX	Brown, Nicollet	49 min
Jul 23, 5:17 AM CDT	Severe Thunderstorm Warning	MPX	Anoka, Chisago, Isanti	28 min
Jul 23, 5:42 AM CDT	Severe Thunderstorm Warning	MPX	Blue Earth	48 min
Jul 23, 6:04 AM CDT	Severe Thunderstorm Warning	MPX	Le Sueur	41 min
Jul 23, 7:31 AM CDT	Severe Thunderstorm Warning	MPX	Goodhue	44 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.