Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 202, NWS Twin Cities, MN

July 1, 20124 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 1, 2012, 2:59 PM CDT for 4 counties in Minnesota. It was in force for 31 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
Jul 1, 2012, 2:59 PM CDT (19:59 UTC)
Expired
Jul 1, 2012, 3:30 PM CDT
In force
31 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Brown County, MN, Nicollet County, MN, Renville County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 94 km from the middle of the area, began a volume at 19:59 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
Jul 1, 3:05 PM CDTHAIL 1.54 W St George, MNLASTED FIVE MINUTES.
Jul 1, 3:10 PM CDTHAIL 0.883 Wsw Gibbon, MN

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, 8.0 hours before the alert went out and 92 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 2012-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1200 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 12:00Z on 2012-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 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
1200 J/kg
Mixed-layer CIN
-122 J/kg
Mixed-layer LCL
1457 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
62 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

261 
WUUS53 KMPX 011959
SVRMPX
MNC015-103-129-143-012030-
/O.NEW.KMPX.SV.W.0202.120701T1959Z-120701T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
259 PM CDT SUN JUL 1 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL BROWN COUNTY IN SOUTH CENTRAL MINNESOTA...
  NORTHWESTERN NICOLLET COUNTY IN SOUTH CENTRAL MINNESOTA...
  EXTREME SOUTHEASTERN RENVILLE COUNTY IN CENTRAL MINNESOTA...
  SOUTHWESTERN SIBLEY COUNTY IN CENTRAL MINNESOTA...

* UNTIL 330 PM CDT

* AT 255 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS OF 60 MPH. THIS
  STORM WAS LOCATED NEAR ST GEORGE...OR ABOUT 9 MILES NORTHWEST OF
  NEW ULM...AND MOVING NORTH AT 20 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  ST GEORGE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS IN EXCESS OF 60 MPH AND LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4457 9473 4452 9448 4434 9455 4436 9467
TIME...MOT...LOC 1959Z 184DEG 19KT 4441 9461
WIND...HAIL 60MPH 1.00IN

$$

CLF
1 follow-up statement
017 
WWUS53 KMPX 012014
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
314 PM CDT SUN JUL 1 2012

MNC015-012030-
/O.CAN.KMPX.SV.W.0202.000000T0000Z-120701T2030Z/
BROWN MN-
314 PM CDT SUN JUL 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BROWN COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4438 9454 4441 9466 4457 9473 4452 9448
TIME...MOT...LOC 2015Z 184DEG 19KT 4447 9460

$$

MNC103-129-143-012030-
/O.CON.KMPX.SV.W.0202.000000T0000Z-120701T2030Z/
NICOLLET MN-RENVILLE MN-SIBLEY MN-
314 PM CDT SUN JUL 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
SIBLEY...EXTREME SOUTHEASTERN RENVILLE AND NORTHWESTERN NICOLLET
COUNTIES UNTIL 330 PM CDT...

AT 312 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS
LOCATED NEAR ST GEORGE...OR 12 MILES NORTHWEST OF NEW ULM...MOVING
NORTH AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EXTREME SOUTHEASTERN RENVILLE AND
  SOUTHWESTERN SIBLEY COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...LARGE HAIL...AND DEADLY LIGHTNING. FOR YOUR PROTECTION MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4438 9454 4441 9466 4457 9473 4452 9448
TIME...MOT...LOC 2015Z 184DEG 19KT 4447 9460
WIND...HAIL <50MPH 1.00IN

$$

CLF

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 2:38 PM CDTSpecial Weather StatementMPXMartin52 min
Jul 1, 2:55 PM CDTSpecial Weather StatementMPXBrown35 min
Jul 1, 3:54 PM CDTSpecial Weather StatementMPXSibley36 min
Jul 1, 4:02 PM CDTSevere Thunderstorm WarningMPXSibley28 min
Jul 1, 4:14 PM CDTHeat AdvisoryMPXAnoka, Benton, Blue Earth, Brown, Carver, Chippewa and 36 more37 hr
Jul 1, 4:52 PM CDTSpecial Weather StatementMPXRenville23 min
Jul 1, 5:14 PM CDTSpecial Weather StatementMPXRenville31 min
Jul 1, 5:18 PM CDTSevere Thunderstorm WarningMPXRenville27 min
Jul 1, 5:36 PM CDTSpecial Weather StatementMPXKanabec24 min
Jul 1, 5:47 PM CDTSevere Thunderstorm WarningMPXKanabec28 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012Every severe thunderstorm warning in 2012

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.