Alert archive / Minnesota / Special Weather Statements in 2017

Special Weather Statement, NWS Twin Cities, MN

July 21, 2017Todd County, Minnesota

NWS Twin Cities, MN issued this special weather statement at Jul 21, 2017, 8:28 PM CDT for Todd County, Minnesota. It was in force for 47 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 21, 2017, 8:28 PM CDT (01:28 UTC)
Expired
Jul 21, 2017, 9:15 PM CDT
In force
47 min
Issued by
NWS Twin Cities, MN

County Todd County, MN

The radar

The Minneapolis radar (KMPX), 156 km from the middle of the area, began a volume at 01:28 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, 1.5 hours before the alert went out and 154 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 00:00Z on 2017-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 337 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 00:00Z on 2017-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 14 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
337 J/kg
Mixed-layer CIN
-126 J/kg
Mixed-layer LCL
981 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

352 
WWUS83 KMPX 220128
SPSMPX

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
828 PM CDT FRI JUL 21 2017

MNZ042-043-220215-
Morrison-Todd-
828 PM CDT FRI JUL 21 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN TODD AND
SOUTHWESTERN MORRISON COUNTIES...

At 827 PM CDT, a strong thunderstorm was located over Long Prairie,
or 22 miles west of Little Falls, moving east at 30 mph.

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

Locations impacted include...
Long Prairie, Randall, Swanville, Flensburg, Round Prairie, Sobieski,
Burtrum, Elmdale and Long Prairie Airport.

This includes the following highways...
 U.S. Highway 10 in Minnesota between mile markers 135 and 138.
 U.S. Highway 71 between mile markers 181 and 192.

LAT...LON 4590 9501 4605 9503 4610 9445 4584 9443
TIME...MOT...LOC 0127Z 272DEG 26KT 4598 9483 

$$

LS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 8:50 PM CDTSevere Thunderstorm WarningMPXDouglas40 min
Jul 21, 9:14 PM CDTSpecial Weather StatementMPXDouglas46 min
Jul 21, 10:01 PM CDTSpecial Weather StatementMPXPope44 min
Jul 21, 9:37 PM CDTSpecial Weather StatementMPXBarron38 min
Jul 22, 5:05 PM CDTSpecial Weather StatementMPXPierce25 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.