Alert archive / Minnesota / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 81, NWS Twin Cities, MN

August 18, 2014Blue Earth County, Faribault County, Waseca County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 18, 2014, 6:35 PM CDT for Blue Earth County, Faribault County, Waseca County, Minnesota. It was in force for 40 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 18, 2014, 6:35 PM CDT (23:35 UTC)
Expired
Aug 18, 2014, 7:15 PM CDT
In force
40 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Blue Earth County, MN, Faribault County, MN, Waseca County, MN

The radar

The Minneapolis radar (KMPX), 112 km from the middle of the area, began a volume at 23:37 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 18, 6:35 PM CDTHAIL 0.88Mapleton, MN
Aug 18, 6:55 PM CDTTSTM WND DMG7 Ese Mapleton, MNTREE REPORTED DOWN JUST NORTH OF MINNESOTA LAKE, MN VIA TWITTER.

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, 11.6 hours before the alert went out and 112 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 2014-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1122 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 2014-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 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
1122 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
700 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.9

Open this sounding in Storm Lab

The text

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

514 
WUUS53 KMPX 182335
SVRMPX
MNC013-043-161-190015-
/O.NEW.KMPX.SV.W.0081.140818T2335Z-140819T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
635 PM CDT MON AUG 18 2014

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN BLUE EARTH COUNTY IN SOUTH CENTRAL MINNESOTA...
  NORTHEASTERN FARIBAULT COUNTY IN SOUTH CENTRAL MINNESOTA...
  SOUTHWESTERN WASECA COUNTY IN SOUTH CENTRAL MINNESOTA...

* UNTIL 715 PM CDT

* AT 632 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 18 MILES SOUTH OF
  MANKATO...AND MOVING EAST AT 25 MPH.

  HAZARD...60 MPH WIND GUSTS AND HALF DOLLAR SIZE HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO
           ROOFS...SIDING AND TREES.

* THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF
  NORTHEASTERN FARIBAULT...SOUTHEASTERN BLUE EARTH AND SOUTHWESTERN
  WASECA COUNTIES...INCLUDING THE FOLLOWING LOCATIONS...MINNESOTA
  LAKE AND WALDORF.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4382 9407 4399 9398 4396 9361 4385 9365
      4377 9365 4377 9366
TIME...MOT...LOC 2335Z 277DEG 21KT 4390 9391

HAIL...1.25IN
WIND...60MPH

$$
2 follow-up statements
695 
WWUS53 KMPX 190000
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
700 PM CDT MON AUG 18 2014

MNC013-043-161-190015-
/O.CON.KMPX.SV.W.0081.000000T0000Z-140819T0015Z/
FARIBAULT MN-WASECA MN-BLUE EARTH MN-
700 PM CDT MON AUG 18 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
BLUE EARTH...SOUTHWESTERN WASECA AND NORTHEASTERN FARIBAULT COUNTIES
UNTIL 715 PM CDT...

AT 659 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 17 MILES SOUTHWEST
OF WASECA...AND MOVING EAST AT 25 MPH.

HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO
         ROOFS...SIDING AND TREES.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF SOUTHWEST WASECA COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4382 9395 4395 9389 4396 9361 4385 9365
      4378 9365 4377 9366 4377 9367
TIME...MOT...LOC 0000Z 277DEG 21KT 4388 9371

HAIL...1.00IN
WIND...60MPH

$$
343 
WWUS53 KMPX 190008
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
708 PM CDT MON AUG 18 2014

MNC013-043-161-190018-
/O.EXP.KMPX.SV.W.0081.000000T0000Z-140819T0015Z/
FARIBAULT MN-WASECA MN-BLUE EARTH MN-
708 PM CDT MON AUG 18 2014

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BLUE EARTH...
SOUTHWESTERN WASECA AND NORTHEASTERN FARIBAULT COUNTIES WILL EXPIRE
AT 715 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
 HOWEVER...HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4382 9395 4395 9389 4396 9361 4385 9365
      4378 9365 4377 9366 4377 9367
TIME...MOT...LOC 0008Z 277DEG 21KT 4387 9365

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 12:36 AM CDTSpecial Weather StatementMPXFreeborn54 min
Aug 18, 1:32 AM CDTDense Fog AdvisoryMPXBenton, Chippewa, Douglas, Kandiyohi, Lac qui Parle, Meeker and 9 more7 hr
Aug 18, 6:29 AM CDTSpecial Weather StatementMPXTodd46 min
Aug 18, 4:42 PM CDTSpecial Weather StatementMPXPope63 min
Aug 18, 6:07 PM CDTSpecial Weather StatementMPXMartin38 min
Aug 18, 6:32 PM CDTSevere Thunderstorm WarningMPXFaribault, Martin28 min
Aug 18, 6:56 PM CDTSevere Thunderstorm WarningMPXFaribault34 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2014Every severe thunderstorm warning in 2014

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.