Alert archive / Iowa / Special Weather Statements in 2021

Special Weather Statement, NWS Des Moines, IA

August 27, 2021Cerro Gordo County, Iowa

NWS Des Moines, IA issued this special weather statement at Aug 27, 2021, 2:59 PM CDT for Cerro Gordo County, Iowa. It was in force for 16 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 27, 2021, 2:59 PM CDT (19:59 UTC)
Expired: Aug 27, 2021, 3:15 PM CDT
In force: 16 min
Issued by: NWS Des Moines, IA
Hail: 0.00 in
Wind: 50

County Cerro Gordo County, IA

The radar

The Des Moines radar (KDMX), 165 km from the middle of the area, began a volume at 20:01 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, 8.0 hours before the alert went out and 194 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: 487 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 644 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: -16 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 Des Moines, IA wrote its last area forecast discussion before this special weather statement went out at Aug 27, 12:50 PM CDT, 2 hours 9 minutes earlier.

Area forecast discussion, Aug 27, 12:50 PM CDT, 2 hours 9 minutes before

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Hazardous weather outlook, Aug 27, 2:54 PM CDT, 5 minutes before

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In the hours before

Local storm report, Aug 27, 9:32 AM CDT, 5 hours 27 minutes before

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Local storm report, Aug 27, 10:20 AM CDT, 4 hours 39 minutes before

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Local storm report, Aug 27, 10:49 AM CDT, 4 hours 10 minutes before

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Local storm report, Aug 27, 10:51 AM CDT, 4 hours 8 minutes before

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Special weather statement, Aug 27, 2:08 PM CDT, 51 minutes before

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Special weather statement, Aug 27, 2:59 PM CDT, 0 minutes before

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The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 26, 7:02 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll	28 min
Aug 26, 8:35 PM CDT	Special Weather Statement	DMX	Poweshiek	40 min
Aug 26, 8:47 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Poweshiek	58 min
Aug 26, 9:46 PM CDT	Special Weather Statement	DMX	Mahaska	44 min
Aug 26, 10:26 PM CDT	Special Weather Statement	DMX	Mahaska	34 min
Aug 26, 10:30 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Palo Alto	45 min
Aug 26, 10:52 PM CDT	Special Weather Statement	DMX	Wapello	38 min
Aug 26, 11:42 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Palo Alto	33 min
Aug 27, 12:13 AM CDT	Special Weather Statement	DMX	Emmet	32 min
Aug 27, 2:08 PM CDT	Special Weather Statement	DMX	Hancock	37 min
Aug 27, 4:23 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Hancock	52 min
Aug 27, 4:48 PM CDT	Tornado Warning	DMX	Cerro Gordo, Hancock	57 min
Aug 27, 4:58 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Franklin, Hancock	32 min
Aug 27, 5:23 PM CDT	Tornado Warning Tornado observed	DMX	Cerro Gordo	37 min
Aug 27, 5:25 PM CDT	Tornado Warning	DMX	Cerro Gordo	35 min

Nearby

Special Weather Statements in Iowa, 2021 Every special weather statement in 2021

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.