Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 51, NWS Twin Cities, MN

July 14, 2021Freeborn County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 14, 2021, 8:42 AM CDT for Freeborn County, Minnesota. It was in force for 33 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: Jul 14, 2021, 8:42 AM CDT (13:42 UTC)
Expired: Jul 14, 2021, 9:15 AM CDT
In force: 33 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Freeborn County, MN

The radar

The Minneapolis radar (KMPX), 129 km from the middle of the area, began a volume at 13:46 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 1.7 hours before the alert went out and 129 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: 2820 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1084 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

012 
WUUS53 KMPX 141342
SVRMPX
MNC047-141415-
/O.NEW.KMPX.SV.W.0051.210714T1342Z-210714T1415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
842 AM CDT Wed Jul 14 2021

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Freeborn County in south central Minnesota...

* Until 915 AM CDT.

* At 841 AM CDT, a severe thunderstorm was located near Mansfield, or
  16 miles southwest of Albert Lea, moving northeast at 50 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Mansfield around 845 AM CDT.
  Conger around 850 AM CDT.
  Alden around 855 AM CDT.
  Albert Lea and Freeborn around 900 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4384 9365 4385 9364 4362 9305 4350 9305
      4350 9365
TIME...MOT...LOC 1341Z 225DEG 44KT 4354 9367 

HAIL...0.75IN
WIND...60MPH
 
$$

BPH

1 follow-up statement

465 
WWUS53 KMPX 141409
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
909 AM CDT Wed Jul 14 2021

MNC047-141419-
/O.EXP.KMPX.SV.W.0051.000000T0000Z-210714T1415Z/
Freeborn MN-
909 AM CDT Wed Jul 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR FREEBORN COUNTY WILL EXPIRE AT
915 AM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However gusty winds and heavy rain are still
possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
south central Minnesota.

LAT...LON 4384 9365 4385 9364 4362 9305 4350 9305
      4350 9365
TIME...MOT...LOC 1409Z 225DEG 44KT 4375 9339 

$$

BPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 8:11 AM CDT	Severe Thunderstorm Warning	MPX	Faribault, Martin	64 min
Jul 14, 9:08 AM CDT	Special Weather Statement	MPX	Freeborn, Steele, Waseca	52 min
Jul 14, 2:46 PM CDT	Special Weather Statement	MPX	Hennepin	89 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2021 Every severe thunderstorm warning in 2021

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.