Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 155, NWS Twin Cities, MN

July 17, 20114 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 17, 2011, 11:23 PM CDT for 4 counties in Minnesota. It was in force for 52 min. 1 report 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 17, 2011, 11:23 PM CDT (04:23 UTC)
Expired: Jul 18, 2011, 12:15 AM CDT
In force: 52 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Chippewa County, MN, Kandiyohi County, MN, Renville County, MN, Swift County, MN

The radar

The Minneapolis radar (KMPX), 136 km from the middle of the area, began a volume at 04:26 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 17, 11:45 PM CDT	TSTM WND DMG	7 S Kandiyohi, MN	LARGE TREE DOWN ACROSS COUNTY RD 8.

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 17, 4:34 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 4.4 hours before the alert went out and 133 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: 4443 J/kg
Mixed-layer CIN: -102 J/kg
Mixed-layer LCL: 991 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

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

744 
WUUS53 KMPX 180423
SVRMPX
MNC023-067-129-151-180515-
/O.NEW.KMPX.SV.W.0155.110718T0423Z-110718T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1123 PM CDT SUN JUL 17 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHIPPEWA COUNTY IN WEST CENTRAL MINNESOTA...
  SOUTHERN KANDIYOHI COUNTY IN CENTRAL MINNESOTA...
  NORTHWESTERN RENVILLE COUNTY IN CENTRAL MINNESOTA...
  SOUTHEASTERN SWIFT COUNTY IN WEST CENTRAL MINNESOTA...

* UNTIL 1215 AM CDT

* AT 1121 PM 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 6
  MILES EAST OF KERKHOVEN TO 7 MILES SOUTHWEST OF KERKHOVEN TO BIG
  BEND CITY...AND MOVING SOUTHEAST AT 45 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  WILLMAR...
  KERKHOVEN...
  BIG BEND CITY...
  PRIAM...
  KANDIYOHI...
  RAYMOND...
  GLUEK...
  MAYNARD...
  SVEA...
  CLARA CITY...
  MINNESOTA FALLS...
  PRINSBURG...
  BLOMKEST...
  LAKE LILLIAN...

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 4530 9525 4507 9477 4486 9494 4480 9549
      4517 9588
TIME...MOT...LOC 0423Z 297DEG 38KT 4517 9516 4511 9540
          4509 9575
WIND...HAIL 60MPH 1.00IN

$$

CLF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 9:08 PM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stevens	67 min
Jul 17, 9:49 PM CDT	Severe Thunderstorm Warning	MPX	Pope, Stevens	56 min
Jul 17, 10:26 PM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Pope, Stearns, Stevens, Swift	64 min
Jul 17, 10:31 PM CDT	Areal Flood Advisory	MPX	Kandiyohi, Pope, Stearns, Stevens, Swift	3 hr
Jul 17, 10:34 PM CDT	Areal Flood Advisory	MPX	Kandiyohi, Pope, Stearns, Stevens, Swift	3 hr
Jul 17, 11:09 PM CDT	Special Weather Statement	MPX	Chippewa, Kandiyohi, Meeker, Stearns	66 min
Jul 17, 11:54 PM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, McLeod, Meeker, Renville, Sibley	51 min
Jul 18, 12:39 AM CDT	Special Weather Statement	MPX	Carver, Le Sueur, Nicollet, Scott, Sibley	66 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.