Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 174, NWS Twin Cities, MN

July 23, 20114 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 23, 2011, 8:46 AM CDT for 4 counties in Minnesota. It was in force for 44 min. 5 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 23, 2011, 8:46 AM CDT (13:46 UTC)
Expired: Jul 23, 2011, 9:30 AM CDT
In force: 44 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Carver County, MN, Le Sueur County, MN, Rice County, MN, Scott County, MN

The radar

The Minneapolis radar (KMPX), 28 km from the middle of the area, began a volume at 13:46 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, 9:00 AM CDT	HAIL 0.25	10 W New Prague, MN	PEA TO DIME SIZE HAIL WITH SOME QUARTER SIZE. WINDS ESTIMATED 50 MPH WITH 2 INCH TREE LIMBS DOWN.
Jul 23, 9:00 AM CDT	HAIL 0.25	W New Prague, MN	PEA TO DIME SIZE HAIL WITH SOME QUARTERS. EST 50 MPH WINDS WITH 2 INCH LIMBS OWN
Jul 23, 9:00 AM CDT	HAIL 1	10 W New Prague, MN	PEA TO DIME SIZE HAIL WITH SOME QUARTER SIZE. TWO INCH BRANCHES ALSO DOWN.
Jul 23, 9:00 AM CDT	HAIL 1	1 W New Prague, MN	PEA TO DIME SIZE HAIL WITH SOME QUARTERS. TWO INCH BRANCHES ALSO DOWN.
Jul 23, 9:15 AM CDT	HAIL 0.88	Lonsdale, MN

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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 1.8 hours before the alert went out and 27 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: 1467 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 875 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

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

308 
WUUS53 KMPX 231346
SVRMPX
MNC019-079-131-139-231430-
/O.NEW.KMPX.SV.W.0174.110723T1346Z-110723T1430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
846 AM CDT SAT JUL 23 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL CARVER COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHEASTERN LE SUEUR COUNTY IN SOUTH CENTRAL MINNESOTA...
  NORTHWESTERN RICE COUNTY IN SOUTH CENTRAL MINNESOTA...
  SOUTHERN SCOTT COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 930 AM CDT

* AT 841 AM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS...
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
  BELLE PLAINE TO HENDERSON...AND MOVING EAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  BELLE PLAINE...
  JORDAN...
  NEW PRAGUE...
  VESELI...
  LONSDALE...
  WEBSTER...
  NEW MARKET...
  ELKO...
  HEIDELBERG...

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.

REPORT ANY SIGNIFICANT WIND OR HAIL DAMAGE TO THE NEAREST LAW
ENFORCEMENT AGENCY...FOR RELAY TO THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 4455 9389 4463 9384 4464 9376 4468 9377
      4468 9384 4474 9387 4467 9333 4457 9330
      4442 9337
TIME...MOT...LOC 1346Z 285DEG 32KT 4468 9374 4461 9373
          4455 9378
WIND...HAIL 60MPH 1.00IN

$$

1 follow-up statement

847 
WWUS53 KMPX 231406
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
906 AM CDT SAT JUL 23 2011

MNC019-231420-
/O.CAN.KMPX.SV.W.0174.000000T0000Z-110723T1430Z/
CARVER MN-
906 AM CDT SAT JUL 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL CARVER COUNTY IS
CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA.

LAT...LON 4452 9372 4460 9369 4464 9366 4470 9364
      4471 9362 4467 9333 4457 9330 4442 9337
TIME...MOT...LOC 1405Z 285DEG 32KT 4463 9351 4456 9350
          4450 9355

$$

MNC079-131-139-231430-
/O.CON.KMPX.SV.W.0174.000000T0000Z-110723T1430Z/
LE SUEUR MN-RICE MN-SCOTT MN-
906 AM CDT SAT JUL 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
SCOTT...NORTHWESTERN RICE AND NORTHEASTERN LE SUEUR COUNTIES UNTIL
930 AM CDT...

AT 900 AM CDT...TRAINED WEATHER SPOTTERS REPORTED QUARTER SIZE HAIL 
ONE MILE WEST OF NEW PRAGUE ALONG WITH WIND GUSTS TO 50 MPH.
AT 905 AM CDT...THE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 
JORDAN TO NEW PRAGUE...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  VESELI...LONSDALE...WEBSTER...NEW MARKET...ELKO AND CRYSTAL BAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN THE TWIN CITIES.

&&

LAT...LON 4452 9372 4460 9369 4464 9366 4470 9364
      4471 9362 4467 9333 4457 9330 4442 9337
TIME...MOT...LOC 1405Z 285DEG 32KT 4463 9351 4456 9350
          4450 9355
WIND...HAIL 60MPH 1.00IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 7:11 PM CDT	Severe Thunderstorm Warning	MPX	Stevens	30 min
Jul 22, 7:55 PM CDT	Special Weather Statement	MPX	Lac qui Parle	50 min
Jul 22, 8:47 PM CDT	Special Weather Statement	MPX	Lac qui Parle	73 min
Jul 23, 3:56 AM CDT	Heat Advisory	MPX	Blue Earth, Brown, Faribault, Freeborn, Goodhue, Le Sueur and 7 more	11 hr
Jul 23, 4:38 AM CDT	Special Weather Statement	MPX	Douglas, Pope, Stevens	67 min
Jul 23, 4:48 AM CDT	Severe Thunderstorm Warning	MPX	Douglas	42 min
Jul 23, 5:21 AM CDT	Severe Thunderstorm Warning	MPX	Douglas, Morrison, Pope, Stearns, Todd	54 min
Jul 23, 6:21 AM CDT	Special Weather Statement	MPX	Benton, Kandiyohi, Meeker, Mille Lacs, Morrison, Sherburne and 1 more	69 min
Jul 23, 7:39 AM CDT	Special Weather Statement	MPX	Anoka, Chisago, Isanti, Kanabec, McLeod, Meeker and 5 more	51 min
Jul 23, 8:27 AM CDT	Special Weather Statement	MPX	Carver, Scott	48 min
Jul 23, 9:17 AM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Rice, Scott, Steele	58 min
Jul 23, 10:09 AM CDT	Severe Thunderstorm Warning	MPX	Goodhue	51 min
Jul 23, 1:04 PM CDT	Special Weather Statement	MPX	Pope	56 min
Jul 23, 1:53 PM CDT	Special Weather Statement	MPX	Stearns	52 min
Jul 23, 1:55 PM CDT	Special Weather Statement	MPX	Benton	35 min
Jul 23, 2:34 PM CDT	Special Weather Statement	MPX	Sherburne	41 min
Jul 23, 3:08 PM CDT	Special Weather Statement	MPX	Sherburne	37 min
Jul 23, 4:03 PM CDT	Special Weather Statement	MPX	Ramsey, Washington	57 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.