Alert archive / Iowa / Special Weather Statements in 2022

Special Weather Statement, NWS Des Moines, IA

August 27, 2022Grundy County, Marshall County, Iowa

NWS Des Moines, IA issued this special weather statement at Aug 27, 2022, 6:21 PM CDT for Grundy County, Marshall County, Iowa. It was in force for 39 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, 2022, 6:21 PM CDT (23:21 UTC)
Expired: Aug 27, 2022, 7:00 PM CDT
In force: 39 min
Issued by: NWS Des Moines, IA
Hail: 0.50 in
Wind: 55

Counties Grundy County, IA, Marshall County, IA

The radar

The Des Moines radar (KDMX), 94 km from the middle of the area, began a volume at 23:21 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, 11.4 hours before the alert went out and 304 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: 127 J/kg
Mixed-layer CIN: -295 J/kg
Mixed-layer LCL: 785 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 494 m²/s²
0-3 km storm-relative helicity: 516 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

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, 2:23 PM CDT, 3 hours 58 minutes earlier.

Area forecast discussion, Aug 27, 2:23 PM CDT, 3 hours 58 minutes before

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Hazardous weather outlook, Aug 27, 2:58 PM CDT, 3 hours 23 minutes before

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In the hours before

Special weather statement, Aug 27, 4:43 PM CDT, 1 hour 38 minutes before

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Local storm report, Aug 27, 5:13 PM CDT, 1 hour 8 minutes before

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Special weather statement, Aug 27, 6:21 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 27, 2:22 PM CDT	Flood Watch	DMX	Butler, Cerro Gordo, Franklin, Hancock, Winnebago, Worth and 1 more	14 hr
Aug 27, 4:43 PM CDT	Special Weather Statement	DMX	Poweshiek	47 min
Aug 27, 4:51 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Poweshiek, Tama	21 min
Aug 27, 6:16 PM CDT	Severe Thunderstorm Warning	DMX	Emmet	29 min
Aug 27, 6:45 PM CDT	Special Weather Statement	DMX	Cass	30 min

Nearby

Special Weather Statements in Iowa, 2022 Every special weather statement in 2022

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.