Alert archive / Minnesota / Special Weather Statements in 2021

Special Weather Statement, NWS Twin Cities, MN

August 20, 2021Carver County, Minnesota

NWS Twin Cities, MN issued this special weather statement at Aug 20, 2021, 8:59 PM CDT for Carver County, Minnesota. It was in force for 46 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 20, 2021, 8:59 PM CDT (01:59 UTC)
Expired: Aug 20, 2021, 9:45 PM CDT
In force: 46 min
Issued by: NWS Twin Cities, MN
Hail: 0.00 in
Wind: 40

County Carver County, MN

The radar

The Minneapolis radar (KMPX), 29 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.0 hours before the alert went out and 26 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: 395 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 1368 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 233 m²/s²
0-3 km storm-relative helicity: 303 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

019 
WWUS83 KMPX 210159
SPSMPX

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
859 PM CDT Fri Aug 20 2021
 
MNZ066>068-210245-
McLeod MN-Carver MN-Sibley MN-
859 PM CDT Fri Aug 20 2021

...Strong thunderstorms will impact portions of northeastern Sibley,
east central McLeod and Carver Counties through 945 PM CDT...

At 858 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Glencoe to 7 miles south of Gaylord. Movement
was northeast at 40 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Strong thunderstorms will be near...
  Lester Prairie around 910 PM CDT.

Other locations in the path of these storms include Mayer, Watertown,
Green Isle, Norwood Young America, Waconia and Cologne.

This includes U.S. Highway 212 between mile markers 125 and 126.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
central Minnesota.

&&

LAT...LON 4492 9405 4498 9388 4498 9379 4473 9372
      4454 9411
TIME...MOT...LOC 0158Z 221DEG 33KT 4479 9413 4445 9417 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

$$

JLT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 7:06 PM CDT	Severe Thunderstorm Warning	MPX	Morrison, Todd	39 min
Aug 20, 7:13 PM CDT	Special Weather Statement	MPX	Faribault	32 min
Aug 20, 7:51 PM CDT	Special Weather Statement	MPX	Faribault	24 min

Nearby

Special Weather Statements in Minnesota, 2021 Every special weather statement 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.