Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 173, NWS Twin Cities, MN

June 21, 2007Dakota County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 21, 2007, 2:02 AM CDT for Dakota County, Minnesota. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 21, 2007, 2:02 AM CDT (07:02 UTC)
Expired: Jun 21, 2007, 2:30 AM CDT
In force: 28 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Dakota County, MN

The radar

The Minneapolis radar (KMPX), 53 km from the middle of the area, began a volume at 07:04 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 7.0 hours before the alert went out and 55 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: 551 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 2355 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 210702
SVRMPX
MNC037-210730-
/O.NEW.KMPX.SV.W.0173.070621T0702Z-070621T0730Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
202 AM CDT THU JUN 21 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DAKOTA COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 230 AM CDT

* AT 159 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES SOUTH OF
  FARMINGTON...OR ABOUT 19 MILES NORTH OF FARIBAULT...AND MOVING
  SOUTHEAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RANDOLPH...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 4468 9318 4447 9329 4447 9305 4451 9304
      4452 9292 4454 9292 4455 9282 4458 9297

$$

1 follow-up statement

000 
WWUS53 KMPX 210728
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
228 AM CDT THU JUN 21 2007

MNC037-210738-
/O.EXP.KMPX.SV.W.0173.000000T0000Z-070621T0730Z/
DAKOTA MN-
228 AM CDT THU JUN 21 2007

...THE SEVERE THUNDERSTORM WARNING FOR DAKOTA COUNTY EXPIRES AT 230
AM CDT...

SEVERE STORMS WERE ABOUT TO MOVE OUT OF THE COUNTY. HOWEVER...MORE 
THUNDERSTORMS COULD DEVELOP IN THE AREA...REMAIN ALERT FOR 
POSSIBLE ADDITIONAL WARNINGS.

LAT...LON 4468 9318 4447 9329 4447 9305 4451 9304
      4452 9292 4454 9292 4455 9282 4458 9297

$$

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Twin Cities, MN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 21, 12:33 AM CDT, 1 hour 29 minutes earlier.

Area forecast discussion, Jun 21, 12:33 AM CDT, 1 hour 29 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1233 AM CDT THU JUN 21 2007

.AVIATION...
SLOW MOVING FRONTAL BOUNDARY MEANDERING FROM RICE LAKE THROUGH THE
TWIN CITIES TO NEAR REDWOOD FALLS. BOUNDARY WILL BE THE FOCUS FOR
CONVECTION IN THE NEAR TERM WITH A FEW NEW CELLS APPEARING IN THE
LAST HALF HOUR. LOW LEVEL THETA-E ADVECTION REMAINS GOOD OVER
EAST CENTRAL AND SOUTH CENTRAL MN AND WEST CENTRAL WI DURING THE
DAY TOMORROW WITH THE BOUNDARY BECOMING STATIONARY NEARLY WHERE IT
IS NOW. HENCE...MORE CONVECTION.

&&

.PREV DISCUSSION... /ISSUED 735 PM CDT WED JUN 20 2007...UPDATED/

DISCUSSION...

UPDATED ZONES TO ACCOUNT FOR BEST CHANCE OF TSTM DEVELOPMENT
REMAINDER OF EVENING. SEVERE THREAT WILL CONTINUE TO DECREASE
IN COVERAGE AND INTENSITY OVER PORTIONS OF WEST CENTRAL WI AND EAST
CENTRAL MN AS WE HEAD INTO THE 10 PM HOUR. THIS IS IN RESPONSE TO
THE EVACUATION OF A STRONG 250MB DIVERGENCE COUPLET PER THE NAM 40
..COUPLED WITH STORMS MOVING OUT OF BEST ML CAPE AND 0-1KM BULK
SHEAR REGION.

&&

.MPX WATCHES/WARNINGS/ADVISORIES...
MN...NONE.
WI...NONE.
&&

RAH

Hazardous weather outlook, Jun 20, 8:58 PM CDT, 5 hours 4 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
858 PM CDT WED JUN 20 2007

MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028-
220200-
DOUGLAS-TODD-MORRISON-MILLE LACS-KANABEC-STEVENS-POPE-STEARNS-
BENTON-SHERBURNE-ISANTI-CHISAGO-LAC QUI PARLE-SWIFT-CHIPPEWA-
KANDIYOHI-MEEKER-WRIGHT-HENNEPIN-ANOKA-RAMSEY-WASHINGTON-
YELLOW MEDICINE-RENVILLE-MCLEOD-SIBLEY-CARVER-SCOTT-DAKOTA-
REDWOOD-BROWN-NICOLLET-LE SUEUR-RICE-GOODHUE-WATONWAN-BLUE EARTH-
WASECA-STEELE-MARTIN-FARIBAULT-FREEBORN-POLK-BARRON-RUSK-
ST. CROIX-PIERCE-DUNN-PEPIN-EAU CLAIRE-
858 PM CDT WED JUN 20 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND
SOUTH CENTRAL MINNESOTA...AND WEST CENTRAL WISCONSIN.

.DAY ONE...TONIGHT
THERE REMAINS A RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
CENTRAL AND ALL OF SOUTHERN MINNESOTA...ALONG WITH WEST CENTRAL
WISCONSIN...THROUGH THE REMAINDER OF TONIGHT. THE PRIMARY RISK
WILL BE LARGE HAIL...THOUGH ISOLATED DAMAGING WINDS ARE POSSIBLE.
THOUGH THUNDERSTORMS WILL SHOW A WEAKENING TREND THROUGH THE
REMAINDER OF THE EVENING...SOME REDEVELOPMENT IS POSSIBLE
OVERNIGHT. SOME OF THESE THUNDERSTORMS MAY AGAIN REACH SEVERE
LIMITS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

ADDITIONAL THUNDERSTORMS ARE EXPECTED ON THURSDAY AND FRIDAY.
SEVERE STORMS ARE POSSIBLE...WITH THE PRIMARY RISKS ON THURSDAY
APPEARING TO BE LARGE HAIL AND DAMAGING WINDS. HEAVY RAINFALL
WILL ALSO BE POSSIBLE...ESPECIALLY OVER SOUTHWEST AND SOUTH
CENTRAL MINNESOTA.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION WILL CONTINUE THROUGH THE EVENING WHERE
WATCHES REMAIN. SPOTTER ACTIVATION MAY BE REQUIRED AGAIN OVERNIGHT
AND ON THURSDAY.

KAT/MTF

In the hours before

Local storm report, Jun 20, 11:05 PM CDT, 2 hours 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1105 PM CDT WED JUN 20 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1024 PM     HAIL             HASTINGS                44.73N 92.85W
06/20/2007  M0.75 INCH       DAKOTA             MN   TRAINED SPOTTER

&&

SPR

Local storm report, Jun 20, 11:12 PM CDT, 2 hours 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1112 PM CDT WED JUN 20 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1026 PM     HAIL             HASTINGS                44.73N 92.85W
06/20/2007  M1.75 INCH       DAKOTA             MN   TRAINED SPOTTER

&&

SPR

Local storm report, Jun 20, 11:14 PM CDT, 2 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1114 PM CDT WED JUN 20 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0715 PM     HAIL             1 SW CAMBRIDGE          45.55N 93.24W
06/20/2007  M1.75 INCH       ISANTI             MN   TRAINED SPOTTER

&&

SPR

Local storm report, Jun 21, 12:40 AM CDT, 1 hour 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1240 AM CDT THU JUN 21 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1239 AM     FUNNEL CLOUD     HARTLAND                43.80N 93.49W
06/21/2007                   FREEBORN           MN   TRAINED SPOTTER

            WOULD CONTINUE THROUGH 1145 PM AND REACH HALFWAY TO THE
            GROUND.

&&

WFO MPX

Local storm report, Jun 21, 12:40 AM CDT, 1 hour 22 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1240 AM CDT THU JUN 21 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1139 PM     FUNNEL CLOUD     HARTLAND                43.80N 93.49W
06/21/2007                   FREEBORN           MN   TRAINED SPOTTER

            WOULD CONTINUE THROUGH 1145 PM AND REACH HALFWAY TO THE
            GROUND.

&&

WFO MPX

Local storm report, Jun 21, 12:40 AM CDT, 1 hour 22 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1240 AM CDT THU JUN 21 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1139 PM     FUNNEL CLOUD     HARTLAND                43.80N 93.49W
06/20/2007                   FREEBORN           MN   TRAINED SPOTTER

            WOULD CONTINUE THROUGH 1145 PM AND REACH HALFWAY TO THE
            GROUND.

&&

WFO MPX

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 7:11 PM CDT	Severe Thunderstorm Warning	MPX	Carver	49 min
Jun 20, 7:32 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Rice	58 min
Jun 20, 7:57 PM CDT	Severe Thunderstorm Warning	MPX	Scott	48 min
Jun 20, 8:05 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur	55 min
Jun 20, 8:22 PM CDT	Severe Thunderstorm Warning	MPX	Sibley	38 min
Jun 20, 8:25 PM CDT	Severe Thunderstorm Warning	MPX	Rice	50 min
Jun 20, 8:27 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	48 min
Jun 20, 8:39 PM CDT	Severe Thunderstorm Warning	MPX	Scott	36 min
Jun 20, 8:52 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur	53 min
Jun 20, 9:01 PM CDT	Severe Thunderstorm Warning	MPX	Steele	59 min
Jun 20, 9:12 PM CDT	Severe Thunderstorm Warning	MPX	Rice	63 min
Jun 20, 9:20 PM CDT	Severe Thunderstorm Warning	MPX	Washington	55 min
Jun 20, 9:35 PM CDT	Severe Thunderstorm Warning	MPX	Waseca	55 min
Jun 20, 9:43 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur	32 min
Jun 20, 9:51 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Ramsey	24 min
Jun 20, 9:57 PM CDT	Severe Thunderstorm Warning	MPX	Steele	33 min
Jun 20, 10:07 PM CDT	Severe Thunderstorm Warning	MPX	Washington	23 min
Jun 20, 10:08 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur	37 min
Jun 20, 10:14 PM CDT	Severe Thunderstorm Warning	MPX	Rice	43 min
Jun 20, 10:16 PM CDT	Severe Thunderstorm Warning	MPX	Dakota	44 min
Jun 20, 10:28 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn, Steele, Waseca	47 min
Jun 20, 10:29 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	46 min
Jun 20, 10:34 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Nicollet	56 min
Jun 20, 11:05 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue	40 min
Jun 20, 11:22 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn, Steele, Waseca	38 min
Jun 20, 11:32 PM CDT	Tornado Warning	MPX	Freeborn	43 min
Jun 21, 12:49 AM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue	41 min
Jun 21, 1:02 AM CDT	Severe Thunderstorm Warning	MPX	Rice	28 min
Jun 21, 1:39 AM CDT	Severe Thunderstorm Warning	MPX	Goodhue	66 min
Jun 21, 1:57 AM CDT	Severe Thunderstorm Warning	MPX	Sibley	48 min
Jun 21, 2:43 AM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Rice	32 min
Jun 21, 3:29 AM CDT	Severe Thunderstorm Warning	MPX	Rice	18 min
Jun 21, 3:35 AM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Waseca	40 min
Jun 21, 4:12 AM CDT	Severe Thunderstorm Warning	MPX	Steele, Waseca	48 min
Jun 21, 5:46 AM CDT	Severe Thunderstorm Warning	MPX	Steele	44 min
Jun 21, 3:15 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Nicollet	60 min
Jun 21, 3:24 PM CDT	Severe Thunderstorm Warning	MPX	Faribault	66 min
Jun 21, 3:37 PM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi	18 min
Jun 21, 4:05 PM CDT	Tornado Warning	MPX	Blue Earth	25 min
Jun 21, 4:26 PM CDT	Severe Thunderstorm Warning	MPX	Martin	37 min
Jun 21, 4:27 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn	63 min
Jun 21, 4:29 PM CDT	Tornado Warning	MPX	Blue Earth, Faribault	46 min
Jun 21, 4:54 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Scott, Sibley	66 min
Jun 21, 5:06 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Renville	39 min
Jun 21, 5:10 PM CDT	Severe Thunderstorm Warning	MPX	Waseca	30 min
Jun 21, 5:15 PM CDT	Severe Thunderstorm Warning	MPX	Faribault	30 min
Jun 21, 5:26 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn	23 min
Jun 21, 5:33 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur	25 min
Jun 21, 5:37 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Renville	53 min
Jun 21, 6:00 PM CDT	Severe Thunderstorm Warning	MPX	Sibley	60 min
Jun 21, 6:38 PM CDT	Severe Thunderstorm Warning	MPX	Nicollet	43 min
Jun 21, 6:46 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	29 min
Jun 21, 6:50 PM CDT	Severe Thunderstorm Warning	MPX	Brown	25 min
Jun 21, 6:59 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth	61 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.