Alert archive / Minnesota / Special Weather Statements in 2017

Special Weather Statement, NWS Twin Cities, MN

August 6, 2017Douglas County, Minnesota

NWS Twin Cities, MN issued this special weather statement at Aug 6, 2017, 4:08 PM CDT for Douglas County, Minnesota. It was in force for 37 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, 2017, 4:08 PM CDT (21:08 UTC)
Expired
Aug 6, 2017, 4:45 PM CDT
In force
37 min
Issued by
NWS Twin Cities, MN

County Douglas County, MN

The radar

The Minneapolis radar (KMPX), 179 km from the middle of the area, began a volume at 21:08 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, 9.1 hours before the alert went out and 176 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 2017-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 72 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2017-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 7 square meters per square second.19395878Sfc1 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
72 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
1230 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
7 m²/s²
0-3 km storm-relative helicity
-2 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

331 
WWUS83 KMPX 062108
SPSMPX

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
408 PM CDT SUN AUG 6 2017

MNZ041-062145-
Douglas-
408 PM CDT SUN AUG 6 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN DOUGLAS COUNTY...

At 408 PM CDT, a strong thunderstorm was located over Alexandria
Airport, or over Alexandria. the storm is nearly stationary.

Winds in excess of 40 mph and dime size hail are possible with this
storm.

Locations impacted include...
Alexandria, Nelson, Forada and Alexandria Airport. 

This includes Interstate 94 in Minnesota between mile markers 96 and
112.
 
LAT...LON 4576 9547 4591 9552 4595 9523 4576 9519
TIME...MOT...LOC 2108Z 254DEG 3KT 4587 9537 

$$

BORGHOFF

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 2:41 PM CDTSpecial Weather StatementMPXCarver49 min
Aug 6, 4:50 PM CDTSpecial Weather StatementMPXHennepin25 min
Aug 6, 5:04 PM CDTSpecial Weather StatementMPXKandiyohi26 min
Aug 6, 5:28 PM CDTSpecial Weather StatementMPXDouglas17 min
Aug 6, 6:33 PM CDTSpecial Weather StatementMPXWright42 min

Nearby

Special Weather Statements in Minnesota, 2017Every special weather statement in 2017

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.