Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 10, NWS Twin Cities, MN

April 21, 20075 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 21, 2007, 9:47 AM CDT for 5 counties in Minnesota. It was in force for 58 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
Apr 21, 2007, 9:47 AM CDT (14:47 UTC)
Expired
Apr 21, 2007, 10:45 AM CDT
In force
58 min
Issued by
NWS Twin Cities, MN
Area
Counties, with a storm outline in the text

Counties McLeod County, MN, Meeker County, MN, Renville County, MN, Sibley County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 68 km from the middle of the area, began a volume at 14:48 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 21, 10:37 AM CDTHAIL 11 Se Cokato, 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, 2.8 hours before the alert went out and 65 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 2007-04-21Temperature 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 2007-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 341 square meters per square second.193958Sfc1 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
1697 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
341 m²/s²
0-3 km storm-relative helicity
335 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 211448
SVRMPX
MNC085-093-129-143-171-211545-
/O.NEW.KMPX.SV.W.0010.070421T1447Z-070421T1545Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
947 AM CDT SAT APR 21 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WRIGHT COUNTY IN CENTRAL MINNESOTA...
  MEEKER COUNTY IN CENTRAL MINNESOTA...
  MCLEOD COUNTY IN CENTRAL MINNESOTA...
  RENVILLE COUNTY IN CENTRAL MINNESOTA...
  SIBLEY COUNTY IN CENTRAL MINNESOTA...

* UNTIL 1045 AM CDT

* AT 944 AM CDT...DOPPLER RADAR INDICATED TWO SEVERE THUNDERSTORMS...
  ONE NEAR HECTOR...AND THE OTHER NEAR FERNANDO. LARGE HAIL IS
  EXPECTED WITH THESE STORMS.

* LOCATIONS IMPACTED INCLUDE...
  WINSTED...
  HUTCHINSON...
  HECTOR...
  DASSEL...
  COKATO...
  BROWNTON...
  ANNANDALE...

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 4478 9483 4451 9449 4500 9391 4531 9406

$$
RJN
3 follow-up statements
000 
WWUS53 KMPX 211514
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1012 AM CDT SAT APR 21 2007

MNC129-143-211522-
/O.CAN.KMPX.SV.W.0010.000000T0000Z-070421T1545Z/
RENVILLE MN-SIBLEY MN-
1012 AM CDT SAT APR 21 2007

...THE SEVERE THUNDERSTORM WARNING FOR SIBLEY AND RENVILLE COUNTIES
IS CANCELLED...

LAT...LON 4494 9474 4491 9449 4471 9447 4473 9402
      4497 9405 4500 9391 4531 9406

$$

MNC085-093-171-211545-
/O.CON.KMPX.SV.W.0010.000000T0000Z-070421T1545Z/
WRIGHT MN-MEEKER MN-MCLEOD MN-
1012 AM CDT SAT APR 21 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 AM CDT
FOR MCLEOD...MEEKER AND WRIGHT COUNTIES...

AT 1009 AM CDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
THUNDERSTORM...CAPABLE OF PRODUCING LARGE HAIL.  THIS STORM WAS
LOCATED 4 MILES EAST OF CEDAR MILLS...OR ABOUT 13 MILES SOUTHWEST OF
DASSEL...AND MOVING NORTHEAST AT 45 MPH.

ANOTHER SEVERE THUNDERSTORM WAS LOCATED NEAR GLENCOE...MOVING TOWARD 
THE NORTHEAST AT 45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE...STOCKHOLM...
RICE LAKE...COKATO.


LAT...LON 4494 9474 4491 9449 4471 9447 4473 9402
      4497 9405 4500 9391 4531 9406

$$
RJN
000 
WWUS53 KMPX 211529
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1027 AM CDT SAT APR 21 2007

MNC085-211537-
/O.CAN.KMPX.SV.W.0010.000000T0000Z-070421T1545Z/
MCLEOD MN-
1027 AM CDT SAT APR 21 2007

...THE SEVERE THUNDERSTORM WARNING FOR MCLEOD COUNTY IS CANCELLED...

LAT...LON 4495 9474 4492 9449 4499 9450 4497 9407
      4498 9405 4501 9391 4530 9407 4528 9450
      4531 9473 4519 9474

$$

MNC093-171-211545-
/O.CON.KMPX.SV.W.0010.000000T0000Z-070421T1545Z/
WRIGHT MN-MEEKER MN-
1027 AM CDT SAT APR 21 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 AM CDT
FOR MEEKER AND WRIGHT COUNTIES...

AT 1026 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED 4 MILES 
NORTHEAST OF LITCHFIELD...OR ABOUT 9 MILES NORTHWEST OF DASSEL...AND 
MOVING NORTHEAST AT 45 MPH.

AT 1022 AM...HAIL THREE QUARTERS OF AN INCH IN DIAMETER WAS REPORTED 
BY A SPOTTER 1 MILE SOUTH OF LITCHFIELD.

OTHER LOCATIONS IN THE WARNING INCLUDE 
WATKINS AND KINGSTON.


LAT...LON 4495 9474 4492 9449 4499 9450 4497 9407
      4498 9405 4501 9391 4530 9407 4528 9450
      4531 9473 4519 9474

$$
RJN
000 
WWUS53 KMPX 211541
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1040 AM CDT SAT APR 21 2007

MNC093-171-211600-
/O.EXP.KMPX.SV.W.0010.000000T0000Z-070421T1545Z/
WRIGHT MN-MEEKER MN-
1040 AM CDT SAT APR 21 2007

...THE SEVERE THUNDERSTORM WARNING FOR MEEKER AND WRIGHT COUNTIES
EXPIRES AT 1045 AM CDT...

THUNDERSTORMS HAVE WEAKENED...BUT HAIL UP TO DIME SIZE WILL REMAIN 
POSSIBLE IN NORTHERN PARTS OF MEEKER AND WRIGHT COUNTIES UNTIL 1115 
AM CDT. 

LAT...LON 4495 9474 4492 9449 4499 9450 4497 9407
      4498 9405 4501 9391 4530 9407 4528 9450
      4531 9473 4519 9474

$$
RJN

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 21, 3:46 AM CDTWind AdvisoryMPXBlue Earth, Brown, Faribault, Freeborn, Martin, Redwood and 4 more16 hr
Apr 21, 6:12 AM CDTSevere Thunderstorm WarningMPXStearns40 min
Apr 21, 11:31 AM CDTSevere Thunderstorm WarningMPXSherburne29 min
Apr 21, 11:57 AM CDTSevere Thunderstorm WarningMPXIsanti33 min
Apr 21, 12:16 PM CDTSevere Thunderstorm WarningMPXChisago44 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.