Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 20, NWS Twin Cities, MN

April 30, 2007Le Sueur County, Nicollet County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 30, 2007, 12:51 PM CDT for Le Sueur County, Nicollet County, Minnesota. It was in force for 54 min. 3 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
Apr 30, 2007, 12:51 PM CDT (17:51 UTC)
Expired
Apr 30, 2007, 1:45 PM CDT
In force
54 min
Issued by
NWS Twin Cities, MN
Area
Counties, with a storm outline in the text

Counties Le Sueur County, MN, Nicollet County, MN

The radar

The Minneapolis radar (KMPX), 59 km from the middle of the area, began a volume at 17:51 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

TimeReportWhereRemark
Apr 30, 1:00 PM CDTHAIL 0.53 W Norseland, MNHAIL COVERED GROUND.
Apr 30, 1:00 PM CDTHAIL 0.753 S Le Sueur, MN
Apr 30, 1:05 PM CDTHAIL 0.75Norseland, 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, 5.9 hours before the alert went out and 58 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2007-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2007-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -57 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2666 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
-57 m²/s²
0-3 km storm-relative helicity
122 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 301751
SVRMPX
MNC079-103-301845-
/O.NEW.KMPX.SV.W.0020.070430T1751Z-070430T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1251 PM CDT MON APR 30 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 145 PM CDT

* AT 1247 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...  
  CAPABLE OF PRODUCING NICKLE SIZE HAIL.  THIS STORM WAS LOCATED 13  
  MILES  NORTHWEST OF ST PETER...AND MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ST PETER...
  LE CENTER...
  MONTGOMERY...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

LAT...LON 4446 9431 4432 9430 4430 9354 4448 9355
      4445 9393

$$
2 follow-up statements
000 
WWUS53 KMPX 301805
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
104 PM CDT MON APR 30 2007

MNC079-103-301845-
/O.CON.KMPX.SV.W.0020.000000T0000Z-070430T1845Z/
LE SUEUR MN-NICOLLET MN-
104 PM CDT MON APR 30 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 PM CDT
FOR NICOLLET AND LE SUEUR COUNTIES...

AT 104 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
THUNDERSTORM...CAPABLE OF PRODUCING GOLF BALL SIZE HAIL.  THIS STORM
WAS LOCATED 3 MILES SOUTHEAST OF NORSELAND...OR ABOUT 10 MILES
SOUTHWEST OF HENDERSON...AND MOVING EAST AT 30 MPH.

ANOTHER SEVERE THUNDERSTORM WAS LOCATED BETWEEN LE CENTER AN 
KILKENNY AND MOVING EAST AT 30 MPH. 

OTHER LOCATIONS IN THE WARNING INCLUDE ST THOMAS...ST HENRY...
OTTAWA...NORSELAND...ST PETER...MONTGOMERY...LE CENTER...KILKENNY AND
CLEVELAND.

LAT...LON 4445 9424 4432 9423 4430 9354 4448 9355
      4445 9393

$$
000 
WWUS53 KMPX 301827
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
125 PM CDT MON APR 30 2007

MNC079-103-301845-
/O.CON.KMPX.SV.W.0020.000000T0000Z-070430T1845Z/
LE SUEUR MN-NICOLLET MN-
125 PM CDT MON APR 30 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 PM CDT
FOR NICOLLET AND LE SUEUR COUNTIES...

AT 120 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A LINE OF SEVERE 
THUNDERSTORMS...CAPABLE OF PRODUCING QUARTER SIZE LARGE HAIL.  THESE 
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 3 MILES NORTHEAST OF 
OTTAWA TO KLOSSNER...AND MOVING EAST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE 
OTTAWA...NORSELAND...KLOSSNER...ST PETER...MONTGOMERY...LE 
CENTER...KILKENNY AND CLEVELAND.


LAT...LON 4443 9454 4430 9437 4430 9354 4448 9355
      4445 9393

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 1:13 PM CDTSevere Thunderstorm WarningMPXGoodhue, Rice24 min
Apr 30, 2:24 PM CDTSevere Thunderstorm WarningMPXGoodhue24 min
Apr 30, 4:19 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Waseca41 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2007Every 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.