Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 105, NWS Twin Cities, MN

July 1, 20116 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 1, 2011, 7:23 PM CDT for 6 counties in Minnesota. It was in force for 37 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 1, 2011, 7:23 PM CDT (00:23 UTC)
Expired: Jul 1, 2011, 8:00 PM CDT
In force: 37 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 65.0 mph

Counties Carver County, MN, Le Sueur County, MN, McLeod County, MN, Nicollet County, MN, Scott County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 43 km from the middle of the area, began a volume at 00:26 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 1, 7:25 PM CDT	TSTM WND DMG	Glencoe, MN	TREES DOWN ALONG HWY 15 TOWARD BROWNTON. ESTIMATED TIME.
Jul 1, 7:30 PM CDT	HAIL 1.25	Glencoe, MN	AT GLENCOE AIRPORT. ESTIMATED TIME.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 1, 2:08 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.4 hours before the alert went out and 42 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: 4059 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1509 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 20.8

Open this sounding in Storm Lab

The text

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

012 
WUUS53 KMPX 020023
SVRMPX
MNC019-079-085-103-139-143-020100-
/O.NEW.KMPX.SV.W.0105.110702T0023Z-110702T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
723 PM CDT FRI JUL 1 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CARVER COUNTY IN EAST CENTRAL MINNESOTA...
  WESTERN AND NORTHERN LE SUEUR COUNTY IN SOUTH CENTRAL 
  MINNESOTA...
  SOUTHEASTERN MCLEOD COUNTY IN CENTRAL MINNESOTA...  
  EASTERN NICOLLET COUNTY IN SOUTH CENTRAL MINNESOTA...
  WESTERN SCOTT COUNTY IN EAST CENTRAL MINNESOTA...
  EASTERN SIBLEY COUNTY IN CENTRAL MINNESOTA...

* UNTIL 800 PM CDT

* AT 717 PM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS...
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 65 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
  NEW AUBURN TO 10 MILES NORTH OF NORTH MANKATO...AND MOVING EAST AT
  40 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  GAYLORD...
  ST PETER...
  LE SUEUR...
  NEW AUBURN...
  BELLE PLAINE...
  GLENCOE...
  RUSH RIVER...
  KASOTA...
  ARLINGTON...
  PLATO...
  GREEN ISLE...
  CLEVELAND...
  HAMBURG...
  HENDERSON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS IN EXCESS OF 60 MPH AND LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4483 9379 4471 9360 4439 9355 4429 9384
      4420 9416 4431 9416 4475 9431
TIME...MOT...LOC 0020Z 270DEG 36KT 4467 9422 4439 9409
          4422 9405
WIND...HAIL 65MPH 1.00IN

$$

TDK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 7:10 PM CDT	Special Weather Statement	MPX	Chisago	35 min
Jul 1, 7:24 PM CDT	Severe Thunderstorm Warning	MPX	Chisago, Washington	66 min
Jul 1, 7:30 PM CDT	Areal Flood Warning	MPX	Meeker	3 hr
Jul 1, 7:38 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Faribault, Waseca	37 min
Jul 1, 7:39 PM CDT	Areal Flood Warning	MPX	Benton, Morrison	3 hr
Jul 1, 7:45 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Martin	45 min
Jul 1, 7:49 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Carver, Dakota, Hennepin, Le Sueur, Ramsey and 4 more	56 min
Jul 1, 7:59 PM CDT	Areal Flood Advisory	MPX	Anoka, Carver, Dakota, Hennepin, Ramsey, Scott and 1 more	105 min
Jul 1, 8:03 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Dakota, Faribault, Freeborn, Goodhue, Le Sueur and 3 more	57 min
Jul 1, 8:27 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Washington	63 min
Jul 1, 8:31 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Chisago, Isanti, Washington	59 min
Jul 1, 8:59 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn, Steele, Waseca	61 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011 Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.