Alert archive / Minnesota / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 121, NWS Twin Cities, MN

August 6, 2015Blue Earth County, Nicollet County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 6, 2015, 9:02 PM CDT for Blue Earth County, Nicollet County, Minnesota. It was in force for 43 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 6, 2015, 9:02 PM CDT (02:02 UTC)
Expired: Aug 6, 2015, 9:45 PM CDT
In force: 43 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Possible
Hail: 0.88 in
Wind: 60.0 mph

Counties Blue Earth County, MN, Nicollet County, MN

The radar

The Minneapolis radar (KMPX), 81 km from the middle of the area, began a volume at 02:02 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 6, 3:23 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.0 hours before the alert went out and 80 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 583 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 857 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 181 m²/s²
0-3 km storm-relative helicity: 264 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

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

393 
WUUS53 KMPX 070202
SVRMPX
MNC013-103-070245-
/O.NEW.KMPX.SV.W.0121.150807T0202Z-150807T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
902 PM CDT THU AUG 6 2015

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN BLUE EARTH COUNTY IN SOUTH CENTRAL MINNESOTA...
  SOUTHEASTERN NICOLLET COUNTY IN SOUTH CENTRAL MINNESOTA...

* UNTIL 945 PM CDT

* AT 902 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR SKYLINE...OR
  NEAR MANKATO...MOVING SOUTHEAST AT 10 MPH.

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

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES. 

* THIS SEVERE THUNDERSTORM WILL BE NEAR...
  NORTH MANKATO AROUND 920 PM CDT.
  EAGLE LAKE AND ST. CLAIR AROUND 945 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE SKYLINE
AND MANKATO AIRPORT.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 U.S. HIGHWAY 14 BETWEEN MILE MARKERS 122 AND 142.
 U.S. HIGHWAY 169 BETWEEN MILE MARKERS 44 AND 61.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4414 9423 4429 9411 4427 9402 4425 9401
      4424 9402 4424 9391 4420 9377 4418 9377
      4396 9395
TIME...MOT...LOC 0202Z 300DEG 8KT 4419 9409 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

JLT

2 follow-up statements

814 
WWUS53 KMPX 070222
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
922 PM CDT THU AUG 6 2015

MNC103-070231-
/O.CAN.KMPX.SV.W.0121.000000T0000Z-150807T0245Z/
NICOLLET MN-
922 PM CDT THU AUG 6 2015

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN NICOLLET COUNTY
IS CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF 
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT FOR
SOUTH CENTRAL MINNESOTA.

LAT...LON 4410 9413 4416 9406 4417 9401 4419 9402
      4422 9398 4420 9377 4418 9377 4396 9395
TIME...MOT...LOC 0221Z 305DEG 14KT 4415 9402 

$$

MNC013-070245-
/O.CON.KMPX.SV.W.0121.000000T0000Z-150807T0245Z/
BLUE EARTH MN-
922 PM CDT THU AUG 6 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT
FOR NORTHEASTERN BLUE EARTH COUNTY...

AT 921 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER SKYLINE...OR
OVER MANKATO...MOVING SOUTHEAST AT 15 MPH.

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

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES. 

THIS SEVERE STORM WILL BE NEAR...
  EAGLE LAKE AROUND 940 PM CDT.
  ST. CLAIR AROUND 945 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE SKYLINE.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 U.S. HIGHWAY 14 BETWEEN MILE MARKERS 130 AND 142.
 U.S. HIGHWAY 169 BETWEEN MILE MARKERS 51 AND 55.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
THE TWIN CITIES.

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4410 9413 4416 9406 4417 9401 4419 9402
      4422 9398 4420 9377 4418 9377 4396 9395
TIME...MOT...LOC 0221Z 305DEG 14KT 4415 9402 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

JLT

899 
WWUS53 KMPX 070237
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
937 PM CDT THU AUG 6 2015

MNC013-070247-
/O.EXP.KMPX.SV.W.0121.000000T0000Z-150807T0245Z/
BLUE EARTH MN-
937 PM CDT THU AUG 6 2015

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BLUE EARTH COUNTY
WILL EXPIRE AT 945 PM CDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.  HOWEVER HEAVY RAIN
IS STILL POSSIBLE WITH THIS THUNDERSTORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT FOR
SOUTH CENTRAL MINNESOTA.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
THE TWIN CITIES.

LAT...LON 4410 9413 4416 9406 4417 9401 4419 9402
      4422 9398 4420 9377 4418 9377 4396 9395
TIME...MOT...LOC 0236Z 300DEG 8KT 4415 9402 

$$

JLT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 8:13 PM CDT	Special Weather Statement	MPX	Nicollet	47 min
Aug 6, 8:15 PM CDT	Special Weather Statement	MPX	Swift	2 hr
Aug 6, 8:52 PM CDT	Special Weather Statement	MPX	Blue Earth, Le Sueur, Nicollet, Waseca	23 min
Aug 6, 11:45 PM CDT	Special Weather Statement	MPX	Wright	2 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 2015 Every severe thunderstorm warning in 2015

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.