Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 244, NWS Twin Cities, MN

July 23, 2007Freeborn County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 23, 2007, 3:59 AM CDT for Freeborn County, Minnesota. It was in force for 46 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
Jul 23, 2007, 3:59 AM CDT (08:59 UTC)
Expired
Jul 23, 2007, 4:45 AM CDT
In force
46 min
Issued by
NWS Twin Cities, MN
Area
Counties, with a storm outline in the text

County Freeborn County, MN

The radar

The Minneapolis radar (KMPX), 128 km from the middle of the area, began a volume at 09:00 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, 9.0 hours before the alert went out and 129 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 2007-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 820 joules per kilogram.LCLLFCEL10008507005003002001001 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 2007-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 121 square meters per square second.1939Sfc1 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
820 J/kg
Mixed-layer CIN
-261 J/kg
Mixed-layer LCL
1143 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
121 m²/s²
0-3 km storm-relative helicity
258 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 230859
SVRMPX
MNC047-230945-
/O.NEW.KMPX.SV.W.0244.070723T0859Z-070723T0945Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
359 AM CDT MON JUL 23 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  FREEBORN COUNTY IN SOUTH CENTRAL MINNESOTA...

* UNTIL 445 AM CDT

* AT 356 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 4 MILES WEST OF CLARKS
  GROVE...OR ABOUT 7 MILES NORTH OF ALBERT LEA...AND MOVING SOUTH AT
  15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ALBERT LEA...
  ALDEN...
  GLENVILLE...

LAT...LON 4384 9311 4384 9356 4351 9365 4351 9319

$$
2 follow-up statements
000 
WWUS53 KMPX 230922
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
421 AM CDT MON JUL 23 2007

MNC047-230945-
/O.CON.KMPX.SV.W.0244.000000T0000Z-070723T0945Z/
FREEBORN MN-
421 AM CDT MON JUL 23 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 AM CDT
FOR FREEBORN COUNTY...

AT 417 AM CDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
THUNDERSTORM...CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 4 MILES NORTHEAST
OF MANCHESTER...OR ABOUT OVER CLARKS GROVE...AND MOVING SOUTHWEST AT
10 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE MANSFIELD...TWIN LAKES...
MANCHESTER...HAYWARD...HARTLAND...GLENVILLE...GENEVA...FREEBORN...
CONGER AND CLARKS GROVE.

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 4384 9321 4384 9359 4351 9365 4351 9327

$$
000 
WWUS53 KMPX 230946
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
444 AM CDT MON JUL 23 2007

MNC047-230954-
/O.EXP.KMPX.SV.W.0244.000000T0000Z-070723T0945Z/
FREEBORN MN-
444 AM CDT MON JUL 23 2007

...THE SEVERE THUNDERSTORM WARNING FOR FREEBORN COUNTY EXPIRES AT 445
AM CDT...

THUNDERSTORMS HAVE WEAKENED THEREFORE THE SEVERE THUNDERSTORM 
WARNING WAS ALLOWED TO EXPIRE.  HOWEVER...STRONG THUNDERSTORMS 
REMAINED IN THE AREA...REMAIN ALERT FOR POSSIBLE ADDITIONAL WARNINGS.

LAT...LON 4384 9321 4384 9359 4351 9365 4351 9327

$$

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.