Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 187, NWS Twin Cities, MN

July 23, 2001Brown County, Nicollet County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 23, 2001, 5:11 AM CDT for Brown County, Nicollet County, Minnesota. It was in force for 49 min. 1 report 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 23, 2001, 5:11 AM CDT (10:11 UTC)
Expired: Jul 23, 2001, 6:00 AM CDT
In force: 49 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Brown County, MN, Nicollet County, MN

The radar

The Minneapolis radar (KMPX), 95 km from the middle of the area, began a volume at 10:13 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 23, 5:55 AM CDT	Hail 0.75	Nicollet, 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 23, 2:30 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 10.2 hours before the alert went out and 93 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: 2234 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1124 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 231012
SVRMSP

MNC015-103-231100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
511 AM CDT MON JUL 23 2001

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NICOLLET COUNTY IN SOUTH CENTRAL MINNESOTA
  BROWN COUNTY IN SOUTH CENTRAL MINNESOTA

* UNTIL 600 AM CDT

* AT 511 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH DAMAGING
  WINDS 7 MILES NORTHWEST OF NEW ULM...MOVING EAST AT 20 MPH.
  ANOTHER SEVERE THUNDERSTORM WAS LOCATED 5 MILES NORTHWEST OF       
  COMFREY.
 
* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  NEW ULM.
  SLEEPY EYE.
  NICOLLET.
  LAFAYETTE.
  COURTLAND.
  COBDEN.

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

THIS IS A DANGEROUS STORM WITH DAMAGING WINDS...STAY INDOORS AWAY
FROM WINDOWS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 9:29 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle	46 min
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, 5:17 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.