Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 296, NWS Twin Cities, MN

August 11, 2007Le Sueur County, Rice County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 11, 2007, 8:16 PM CDT for Le Sueur County, Rice County, Minnesota. It was in force for 59 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: Aug 11, 2007, 8:16 PM CDT (01:16 UTC)
Expired: Aug 11, 2007, 9:15 PM CDT
In force: 59 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Le Sueur County, MN, Rice County, MN

The radar

The Minneapolis radar (KMPX), 45 km from the middle of the area, began a volume at 01:16 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
Aug 11, 8:53 PM CDT	TSTM WND DMG	Northfield, MN	POWER LINES DOWNED.

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
Aug 11, 6:21 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.3 hours before the alert went out and 46 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: 3342 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1149 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.6

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 120116
SVRMPX
MNC079-131-120215-
/O.NEW.KMPX.SV.W.0296.070812T0116Z-070812T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
816 PM CDT SAT AUG 11 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN LE SUEUR COUNTY IN SOUTH CENTRAL MINNESOTA...
  RICE COUNTY IN SOUTH CENTRAL MINNESOTA...

* UNTIL 915 PM CDT

* AT 812 PM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS...CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM 17 MILES NORTH OF LONSDALE TO 11 MILES
  NORTHWEST OF MONTGOMERY...AND MOVING EAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MONTGOMERY...
  LONSDALE...
  NORTHFIELD...

STAY INDOORS...AND AWAY FROM WINDOWS.

LAT...LON 4454 9330 4453 9373 4429 9352 4445 9303
      4447 9329

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 7:02 PM CDT	Severe Thunderstorm Warning	MPX	Ramsey, Washington	58 min
Aug 11, 7:41 PM CDT	Severe Thunderstorm Warning	MPX	Carver, McLeod	64 min
Aug 11, 7:55 PM CDT	Severe Thunderstorm Warning	MPX	Washington	65 min
Aug 11, 7:57 PM CDT	Severe Thunderstorm Warning	MPX	Scott	63 min
Aug 11, 8:01 PM CDT	Severe Thunderstorm Warning	MPX	Dakota	59 min
Aug 11, 8:26 PM CDT	Severe Thunderstorm Warning	MPX	Chisago, Isanti	64 min
Aug 11, 8:32 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	58 min
Aug 11, 8:43 PM CDT	Severe Thunderstorm Warning	MPX	Nicollet	62 min
Aug 11, 8:58 PM CDT	Severe Thunderstorm Warning	MPX	Dakota	32 min
Aug 11, 9:13 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Rice	47 min
Aug 11, 9:36 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Steele, Waseca	54 min
Aug 11, 10:27 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn, Steele, Waseca	63 min
Aug 11, 11:31 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn	27 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2007 Every severe thunderstorm warning in 2007

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.