Alert archive / Minnesota / Areal Flood Advisories in 2012

Areal Flood Advisory 24, NWS Twin Cities, MN

July 21, 20125 counties in Minnesota

NWS Twin Cities, MN issued this areal flood advisory at Jul 21, 2012, 5:21 AM CDT for 5 counties in Minnesota. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jul 21, 2012, 5:21 AM CDT (10:21 UTC)
Expired: Jul 21, 2012, 8:30 AM CDT
In force: 3 hr
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon

Counties Benton County, MN, Isanti County, MN, Kanabec County, MN, Mille Lacs County, MN, Morrison County, MN

The radar

The Minneapolis radar (KMPX), 110 km from the middle of the area, began a volume at 10:25 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, 10.4 hours before the alert went out and 109 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: 6 J/kg
Mixed-layer CIN: -435 J/kg
Mixed-layer LCL: 1726 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory 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 advisory went out at Jul 21, 3:10 AM CDT, 2 hours 11 minutes earlier.

Area forecast discussion, Jul 21, 3:10 AM CDT, 2 hours 11 minutes before

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Hazardous weather outlook, Jul 21, 3:44 AM CDT, 1 hour 37 minutes before

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In the hours before

Local storm report, Jul 21, 4:08 AM CDT, 1 hour 13 minutes before

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      <div class="status" id="status">Temporary Notice</div>
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Nearby

Areal Flood Advisories in Minnesota, 2012 Every areal flood advisory in 2012

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.