Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 334, NWS Twin Cities, MN

August 28, 2007Sibley County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 28, 2007, 1:49 AM CDT for Sibley County, Minnesota. It was in force for 56 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
Aug 28, 2007, 1:49 AM CDT (06:49 UTC)
Expired
Aug 28, 2007, 2:45 AM CDT
In force
56 min
Issued by
NWS Twin Cities, MN
Area
Counties, with a storm outline in the text

County Sibley County, MN

The radar

The Minneapolis radar (KMPX), 69 km from the middle of the area, began a volume at 06:51 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, 6.8 hours before the alert went out and 66 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 2007-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2564 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2007-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 379 square meters per square second.19395878Sfc1 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
2564 J/kg
Mixed-layer CIN
-230 J/kg
Mixed-layer LCL
806 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
379 m²/s²
0-3 km storm-relative helicity
526 m²/s²
Significant tornado parameter
0.0
Supercell composite
8.1

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 280649
SVRMPX
MNC143-280745-
/O.NEW.KMPX.SV.W.0334.070828T0649Z-070828T0745Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
149 AM CDT TUE AUG 28 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 245 AM CDT

* AT 147 AM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE           
  THUNDERSTORMS...CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...AND   
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED     
  ALONG A LINE EXTENDING FROM 25 MILES NORTH OF WINTHROP TO 24       
  MILES SOUTHWEST OF GIBBON...AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  GIBBON...
  WINTHROP...
  GAYLORD...

DAMAGING WINDS UP TO 62 MPH WERE REPORTED IN REDWOOD FALLS WITH THIS 
STORM.

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 4463 9449 4473 9450 4473 9462 4446 9463
      4448 9416 4472 9408 4471 9424 4462 9424

$$
2 follow-up statements
000 
WWUS53 KMPX 280703
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
203 AM CDT TUE AUG 28 2007

MNC143-280745-
/O.CON.KMPX.SV.W.0334.000000T0000Z-070828T0745Z/
SIBLEY MN-
203 AM CDT TUE AUG 28 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 AM CDT
FOR SIBLEY COUNTY...

AT 159 AM CDT...DOPPLER RADAR CONTINUED TO INDICATE A LINE OF SEVERE
THUNDERSTORMS...CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 75 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 4 MILES SOUTHWEST OF GIBBON TO 12 MILES WEST OF NEW
AUBURN...AND MOVING EAST AT 50 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE RUSH RIVER...NEW ROME...NEW
SWEDEN...COATES...WINTHROP...NEW AUBURN...HENDERSON...GREEN ISLE...
GIBBON AND GAYLORD.

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 4463 9449 4473 9450 4473 9461 4446 9463
      4446 9393 4455 9391 4460 9390 4462 9388
      4468 9387 4473 9389 4471 9424 4462 9424

$$
000 
WWUS53 KMPX 280733
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
232 AM CDT TUE AUG 28 2007

MNC143-280745-
/O.CON.KMPX.SV.W.0334.000000T0000Z-070828T0745Z/
SIBLEY MN-
232 AM CDT TUE AUG 28 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 AM CDT
FOR SIBLEY COUNTY...

AT 230 AM CDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE 
THUNDERSTORM IN THE EASTERN PART OF SIBLEY COUNTY CAPABLE OF 
PRODUCING NICKEL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 75 MPH. 
THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 5 MILES SOUTH 
OF GREEN ISLE TO 8 MILES NORTH OF GREEN ISLE...AND MOVING EAST AT 50 
MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE COATES...HENDERSON AND GREEN
ISLE.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN A STORM 
ENTERING NORTHERN LE SUEUR COUNTY. WHILE NOT IMMEDIATELY LIKELY...A 
TORNADO MAY STILL DEVELOP. IF A TORNADO IS SPOTTED...ACT QUICKLY AND 
MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A BASEMENT 
OR SMALL INTERIOR ROOM.

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 4459 9408 4446 9393 4455 9391 4460 9390
      4462 9388 4464 9387 4465 9375 4467 9386
      4472 9390 4471 9416

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 10:17 PM CDTSevere Thunderstorm WarningMPXIsanti, Kanabec23 min
Aug 27, 10:37 PM CDTSevere Thunderstorm WarningMPXTodd28 min
Aug 28, 12:59 AM CDTSevere Thunderstorm WarningMPXRedwood, Renville, Yellow Medicine61 min
Aug 28, 1:39 AM CDTSevere Thunderstorm WarningMPXCarver, McLeod, Wright51 min
Aug 28, 1:52 AM CDTSevere Thunderstorm WarningMPXChisago53 min
Aug 28, 2:13 AM CDTSevere Thunderstorm WarningMPXDakota, Hennepin, Le Sueur, Rice, Scott62 min
Aug 28, 2:27 AM CDTSevere Thunderstorm WarningMPXCarver40 min
Aug 28, 2:47 AM CDTFlash Flood WarningMPXCarver, Dakota, Hennepin, Scott3 hr
Aug 28, 2:47 AM CDTFlash Flood WarningMPXCarver, Dakota, Hennepin, Ramsey, Scott3 hr
Aug 28, 2:54 AM CDTSevere Thunderstorm WarningMPXRamsey, Washington51 min
Aug 28, 3:11 AM CDTSevere Thunderstorm WarningMPXDakota19 min
Aug 28, 11:44 AM CDTSevere Thunderstorm WarningMPXDakota, Rice46 min
Aug 28, 12:04 PM CDTSevere Thunderstorm WarningMPXGoodhue48 min
Aug 28, 1:09 PM CDTSevere Thunderstorm WarningMPXGoodhue40 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.