Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 343, NWS Twin Cities, MN

August 28, 2007Dakota County, Rice County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 28, 2007, 11:44 AM CDT for Dakota County, Rice County, Minnesota. It was in force for 46 min. 2 reports 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
Aug 28, 2007, 11:44 AM CDT (16:44 UTC)
Expired
Aug 28, 2007, 12:30 PM CDT
In force
46 min
Issued by
NWS Twin Cities, MN
Area
Counties, with a storm outline in the text

Counties Dakota County, MN, Rice County, MN

The radar

The Minneapolis radar (KMPX), 47 km from the middle of the area, began a volume at 16:46 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
Aug 28, 12:00 PM CDTHAIL 1Northfield, MNDIME TO QUARTER SIZE HAIL BEAT UP SEVERAL POLICE CARS IN THE CITY NORTHFIELD. SOME LOCAL STREET FLOODING ALSO REPORTED.
Aug 28, 12:00 PM CDTHAIL 1.54 S Castle Rock, MNSEVERAL THIRTY FOOT DIAMETER TREES ALSO REPORTED DOWNED WITH DIAMETERS OF 3 TO 5 INCHES.

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, 4.7 hours before the alert went out and 48 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 2007-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 145 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 12:00Z on 2007-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 101 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
145 J/kg
Mixed-layer CIN
-363 J/kg
Mixed-layer LCL
1160 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
101 m²/s²
0-3 km storm-relative helicity
55 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 281644
SVRMPX
MNC037-131-281730-
/O.NEW.KMPX.SV.W.0343.070828T1644Z-070828T1730Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1144 AM CDT TUE AUG 28 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 1230 PM CDT

* AT 1142 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING QUARTER SIZE HAIL.DAMAGING WINDS IN EXCESS OF
  60 MPH.  THIS STORM WAS LOCATED 5 MILES WEST OF NORTHFIELD...OR
  ABOUT 11 MILES NORTH OF FARIBAULT...AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NORTHFIELD...

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 4452 9342 4435 9337 4442 9307 4462 9304

$$
1 follow-up statement
000 
WWUS53 KMPX 281708
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1208 PM CDT TUE AUG 28 2007

MNC037-131-281730-
/O.CON.KMPX.SV.W.0343.000000T0000Z-070828T1730Z/
DAKOTA MN-RICE MN-
1208 PM CDT TUE AUG 28 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 PM CDT
FOR RICE AND DAKOTA COUNTIES...

AT 1203 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
THUNDERSTORM...CAPABLE OF PRODUCING GOLF BALL SIZE HAIL AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 3 MILES SOUTHEAST
OF RANDOLPH...OR ABOUT 7 MILES WEST OF CANNON FALLS...AND MOVING EAST
AT 35 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE RANDOLPH...NORTHFIELD...NEW
TRIER...MIESVILLE AND HAMPTON.

LAT...LON 4456 9318 4442 9319 4442 9307 4456 9303
      4453 9300 4456 9281 4468 9286

$$

AJZ

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, 1:49 AM CDTSevere Thunderstorm WarningMPXSibley56 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, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.