Alert archive / Minnesota / Special Weather Statements in 2018

Special Weather Statement, NWS Twin Cities, MN

September 17, 20186 counties in Minnesota

NWS Twin Cities, MN issued this special weather statement at Sep 17, 2018, 11:52 AM CDT for 6 counties in Minnesota. It was in force for 38 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: Sep 17, 2018, 11:52 AM CDT (16:52 UTC)
Expired: Sep 17, 2018, 12:30 PM CDT
In force: 38 min
Issued by: NWS Twin Cities, MN

Counties Brown County, MN, Chippewa County, MN, Kandiyohi County, MN, Redwood County, MN, Renville County, MN, Swift County, MN

The radar

The Minneapolis radar (KMPX), 139 km from the middle of the area, began a volume at 16:55 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, 4.9 hours before the alert went out and 136 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: 400 J/kg
Mixed-layer CIN: -276 J/kg
Mixed-layer LCL: 1173 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Twin Cities, MN wrote its last area forecast discussion before this special weather statement went out at Sep 17, 6:05 AM CDT, 5 hours 47 minutes earlier.

Area forecast discussion, Sep 17, 6:05 AM CDT, 5 hours 47 minutes before

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Hazardous weather outlook, Sep 17, 3:52 AM CDT, 8 hours before

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In the hours before

Special weather statement, Sep 17, 11:04 AM CDT, 48 minutes before

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Special weather statement, Sep 17, 11:30 AM CDT, 22 minutes before

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1130 AM CDT MON SEP 17 2018

MNZ054>056-064-171700-
Chippewa-Yellow Medicine-Lac Qui Parle-Swift-
1130 AM CDT MON SEP 17 2018

...A STRONG THUNDERSTORM WILL AFFECT LAC QUI PARLE...WESTERN
CHIPPEWA...YELLOW MEDICINE AND SOUTH CENTRAL SWIFT COUNTIES...

At 1130 AM CDT, a strong thunderstorm was located over St. Leo, or 21
miles northwest of Marshall, moving east at 55 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Locations impacted include...
Montevideo, Canby, Madison, Dawson, Clarkfield, Milan, Hanley Falls,
Watson, Porter, Boyd, Marietta and Cerro Gordo.

This includes the following highways...
 U.S. Highway 212 between mile markers 1 and 45.
 U.S. Highway 75 between mile markers 95 and 117.
 U.S. Highway 59 between mile markers 87 and 107.

LAT...LON 4507 9645 4523 9562 4455 9559 4455 9561
      4462 9561 4463 9563 4463 9645
TIME...MOT...LOC 1630Z 248DEG 46KT 4471 9604

AMK

Special weather statement, Sep 17, 11:52 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1152 AM CDT MON SEP 17 2018

MNZ048-049-055>058-064-065-073-074-082-171730-
Brown-Chippewa-Yellow
Medicine-Watonwan-Stearns-Kandiyohi-Renville-Meeker-Pope-Swift-
Redwood-
1152 AM CDT MON SEP 17 2018

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT SOUTHERN POPE...
WESTERN MEEKER...CHIPPEWA...REDWOOD...EASTERN YELLOW MEDICINE...
WESTERN BROWN...WESTERN STEARNS...NORTHWESTERN WATONWAN...SWIFT...
RENVILLE AND KANDIYOHI COUNTIES...

At 1152 AM CDT, strong thunderstorms were clustered over Granite
Falls Airport, or 17 miles southeast of Montevideo, moving east at 55
mph.

Winds in excess of 30 mph are possible with this storm.

Locations impacted include...
Willmar, Montevideo, Redwood Falls, Sleepy Eye, Benson, Granite
Falls, Olivia, Paynesville, Springfield, Clara City, Renville and New
London.

This includes the following highways...
 Interstate 94 in Minnesota between mile markers 139 and 142.
 U.S. Highway 12 between mile markers 34 and 92.
 U.S. Highway 14 between mile markers 44 and 91.
 U.S. Highway 212 between mile markers 35 and 92.
 U.S. Highway 8 in Minnesota near mile marker 6.
 U.S. Highway 71 between mile markers 52 and 160.

LAT...LON 4489 9578 4492 9573 4495 9578 4541 9579
      4541 9575 4545 9575 4568 9466 4445 9468
      4446 9478 4441 9468 4405 9468 4408 9486
      4411 9487 4411 9510 4420 9512 4420 9560
      4462 9561 4463 9578
TIME...MOT...LOC 1652Z 260DEG 46KT 4472 9554

AMK

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 11:04 AM CDT	Special Weather Statement	MPX	Lac qui Parle	26 min
Sep 17, 11:30 AM CDT	Special Weather Statement	MPX	Lac qui Parle, Yellow Medicine	30 min
Sep 17, 12:28 PM CDT	Special Weather Statement	MPX	Brown, Kandiyohi, McLeod, Meeker, Redwood, Renville and 3 more	47 min
Sep 17, 12:54 PM CDT	Special Weather Statement	MPX	Anoka, Blue Earth, Brown, Carver, Hennepin, Le Sueur and 7 more	51 min
Sep 17, 1:34 PM CDT	Special Weather Statement	MPX	Anoka, Blue Earth, Carver, Chisago, Dakota, Hennepin and 6 more	41 min
Sep 17, 2:08 PM CDT	Special Weather Statement	MPX	Dakota, Faribault, Freeborn, Goodhue, Ramsey, Rice and 3 more	67 min
Sep 17, 2:17 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Rice, Washington	43 min
Sep 17, 3:09 PM CDT	Special Weather Statement	MPX	Freeborn	36 min
Sep 17, 3:22 PM CDT	Special Weather Statement	MPX	Redwood, Renville	23 min
Sep 17, 3:43 PM CDT	Special Weather Statement	MPX	Brown	32 min
Sep 17, 4:03 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Nicollet, Sibley, Watonwan	27 min
Sep 17, 4:40 PM CDT	Special Weather Statement	MPX	Blue Earth, Le Sueur, Waseca	35 min
Sep 17, 5:02 PM CDT	Special Weather Statement	MPX	Rice, Steele, Waseca	28 min

Nearby

Special Weather Statements in Minnesota, 2018 Every special weather statement in 2018

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.