Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 23, NWS Twin Cities, MN

April 30, 2007Blue Earth County, Waseca County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 30, 2007, 4:19 PM CDT for Blue Earth County, Waseca County, Minnesota. It was in force for 41 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, 4:19 PM CDT (21:19 UTC)
Expired: Apr 30, 2007, 5:00 PM CDT
In force: 41 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Blue Earth County, MN, Waseca County, MN

The radar

The Minneapolis radar (KMPX), 78 km from the middle of the area, began a volume at 21:20 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
Apr 30, 4:25 PM CDT	HAIL 0.5	10 E Mankato, MN	LASTED ABOOUT 5 MINUTES
Apr 30, 4:30 PM CDT	HAIL 0.88	4 Nne Janesville, MN
Apr 30, 4:30 PM CDT	HAIL 0.88	Eagle Lake, 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, 9.3 hours before the alert went out and 77 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: 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 302118
SVRMPX
MNC013-161-302200-
/O.NEW.KMPX.SV.W.0023.070430T2119Z-070430T2200Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BLUE EARTH COUNTY IN SOUTH CENTRAL MINNESOTA...
  WASECA COUNTY IN SOUTH CENTRAL MINNESOTA...

* UNTIL 500 PM CDT

* AT 416 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING LARGE HAIL.  THIS STORM WAS LOCATED NEAR EAGLE
  LAKE...OR ABOUT 5 MILES EAST OF MANKATO...AND MOVING EAST AT 50
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  JANESVILLE...
  WASECA...

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 4425 9397 4411 9402 4399 9347 4419 9339
      4420 9373

$$

2 follow-up statements

000 
WWUS53 KMPX 302144
SVSMPX

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

MNC013-161-302200-
/O.CON.KMPX.SV.W.0023.000000T0000Z-070430T2200Z/
BLUE EARTH MN-WASECA MN-
444 PM CDT MON APR 30 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR WASECA AND BLUE EARTH COUNTIES...

AT 442 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE 
THUNDERSTORM...CAPABLE OF PRODUCING DIME SIZE HAIL.
THIS STORM WAS LOCATED 5 MILES NORTH OF WASECA...OR ABOUT 5 MILES 
SOUTHEAST OF WATERVILLE...AND MOVING EAST AT 50 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE WASECA...MADISON LAKE...
JANESVILLE AND EAGLE LAKE.

LAT...LON 4423 9392 4411 9396 4405 9344 4419 9339
      4420 9373

$$
JPR

000 
WWUS53 KMPX 302156
SVSMPX

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

MNC013-161-302204-
/O.EXP.KMPX.SV.W.0023.000000T0000Z-070430T2200Z/
BLUE EARTH MN-WASECA MN-
454 PM CDT MON APR 30 2007

...THE SEVERE THUNDERSTORM WARNING FOR WASECA AND BLUE EARTH COUNTIES
EXPIRES AT 500 PM CDT...

STRONG TO SEVERE STORMS WERE WEAKENING SLIGHTLY AND HAD MOVED OUT OF 
BLUE EARTH COUNTY. HOWEVER...STORMS OVER NORTHEAST WASECA COUNTY 
COULD STILL PRODUCE NEAR DIME SIZE HAIL. REMAIN ALERT FOR POSSIBLE 
REDEVELOPMENT. 

LAT...LON 4423 9392 4411 9396 4405 9344 4419 9339
      4420 9373

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 12:51 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Nicollet	54 min
Apr 30, 1:13 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue, Rice	24 min
Apr 30, 2:24 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	24 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.