Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 9, NWS Twin Cities, MN

April 21, 2007Stearns County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 21, 2007, 6:12 AM CDT for Stearns County, Minnesota. It was in force for 40 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
Apr 21, 2007, 6:12 AM CDT (11:12 UTC)
Expired
Apr 21, 2007, 6:52 AM CDT
In force
40 min
Issued by
NWS Twin Cities, MN
Area
Counties, with a storm outline in the text

County Stearns County, MN

The radar

The Minneapolis radar (KMPX), 105 km from the middle of the area, began a volume at 11:13 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 11.2 hours before the alert went out and 103 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 00:00Z 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 00:00Z on 2007-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 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
1916 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
95 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 211112
SVRMPX
MNC145-211215-
/O.NEW.KMPX.SV.W.0009.070421T1112Z-070421T1215Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  STEARNS COUNTY IN CENTRAL MINNESOTA...

* UNTIL 715 AM CDT

* AT 609 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING LARGE HAIL.  THIS STORM WAS LOCATED 7 MILES
  EAST OF PAYNESVILLE...OR ABOUT 18 MILES NORTH OF LITCHFIELD...AND
  MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ALBANY...
  COLD SPRING...
  PLEASANT LAKE...
 
STAY INDOORS...AND AWAY FROM WINDOWS.

LAT...LON 4533 9475 4534 9427 4577 9428 4576 9458

$$
2 follow-up statements
000 
WWUS53 KMPX 211130
SVSMPX

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

MNC145-211215-
/O.CON.KMPX.SV.W.0009.000000T0000Z-070421T1215Z/
STEARNS MN-
627 AM CDT SAT APR 21 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM CDT
FOR STEARNS COUNTY...

AT 620 AM CDT...PENNY SIZE HAIL WAS REPORTED IN SARTELL WITH AN 
ADDITIONAL SEVERE THUNDERSTORM.

AT 626 AM CDT...ANOTHER STORM WAS LOCATED NEAR COLD SPRING...OR 
ABOUT 10 MILES NORTH OF WATKINS...AND MOVING NORTHEAST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE ST 
NICHOLAS....COLLEGEVILLE...ST STEPHEN...ST MARTIN...ST 
JOSEPH...ROSCOE...ROCKVILLE....HOLDINGFORD...COLD SPRING...AVON AND 
ALBANY.

LAT...LON 4533 9475 4534 9427 4577 9428 4576 9458

$$
000 
WWUS53 KMPX 211152
SVSMPX

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

MNC145-211202-
/O.CAN.KMPX.SV.W.0009.000000T0000Z-070421T1215Z/
STEARNS MN-
652 AM CDT SAT APR 21 2007

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

RADAR INDICATED THAT THE STORM HAD WEAKENED TO BELOW SEVERE LIMITS.
THUS THE WARNING HAS BEEN CANCELLED.

LAT...LON 4533 9475 4534 9427 4577 9428 4576 9458

$$

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, 9:47 AM CDTSevere Thunderstorm WarningMPXMcLeod, Meeker, Renville, Sibley, Wright58 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.