Alert archive / Minnesota / Areal Flood Warnings in 2010

Areal Flood Warning 18, NWS Twin Cities, MN

September 15, 2010Lac qui Parle County, Yellow Medicine County, Minnesota

NWS Twin Cities, MN issued this areal flood warning at Sep 15, 2010, 8:32 PM CDT for Lac qui Parle County, Yellow Medicine County, Minnesota. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 15, 2010, 8:32 PM CDT (01:32 UTC)
Expired: Sep 16, 2010, 5:30 AM CDT
In force: 9 hr
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Flood severity: None

Counties Lac qui Parle County, MN, Yellow Medicine County, MN

The radar

The Sioux Falls radar (KFSD), 152 km from the middle of the area, began a volume at 01:32 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 191 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: 40 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 721 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 264 m²/s²
0-3 km storm-relative helicity: 405 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning 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 areal flood warning went out at Sep 15, 6:20 PM CDT, 2 hours 12 minutes earlier.

Area forecast discussion, Sep 15, 6:20 PM CDT, 2 hours 12 minutes before

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Hazardous weather outlook, Sep 15, 8:20 PM CDT, 12 minutes before

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In the hours before

Local storm report, Sep 15, 7:03 PM CDT, 1 hour 29 minutes before

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Local storm report, Sep 15, 7:20 PM CDT, 1 hour 12 minutes before

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Local storm report, Sep 15, 7:22 PM CDT, 1 hour 10 minutes before

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Local storm report, Sep 15, 7:52 PM CDT, 40 minutes before

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Local storm report, Sep 15, 8:09 PM CDT, 23 minutes before

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Special weather statement, Sep 15, 8:24 PM CDT, 8 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 8:24 PM CDT	Special Weather Statement	MPX	Martin	36 min
Sep 16, 12:04 PM CDT	River Flood Watch	MPX	Blue Earth, Brown, Nicollet	25 hr

Nearby

Areal Flood Warnings in Minnesota, 2010 Every areal flood warning in 2010

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.