Alert archive / Iowa / Special Weather Statements in 2015

Special Weather Statement, NWS Des Moines, IA

June 20, 2015Poweshiek County, Tama County, Iowa

NWS Des Moines, IA issued this special weather statement at Jun 20, 2015, 8:55 AM CDT for Poweshiek County, Tama County, Iowa. It was in force for 50 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: Jun 20, 2015, 8:55 AM CDT (13:55 UTC)
Expired: Jun 20, 2015, 9:45 AM CDT
In force: 50 min
Issued by: NWS Des Moines, IA

Counties Poweshiek County, IA, Tama County, IA

The radar

The Des Moines radar (KDMX), 96 km from the middle of the area, began a volume at 13:57 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

Davenport, (KDVN), launched 12:00Z, 1.9 hours before the alert went out and 172 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 769 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Jun 20, 6:24 AM CDT, 2 hours 31 minutes earlier.

Area forecast discussion, Jun 20, 6:24 AM CDT, 2 hours 31 minutes before

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Hazardous weather outlook, Jun 20, 4:19 AM CDT, 4 hours 36 minutes before

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In the hours before

Special weather statement, Jun 20, 4:33 AM CDT, 4 hours 22 minutes before

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Special weather statement, Jun 20, 5:22 AM CDT, 3 hours 33 minutes before

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Special weather statement, Jun 20, 6:34 AM CDT, 2 hours 21 minutes before

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Special weather statement, Jun 20, 8:48 AM CDT, 7 minutes before

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Special weather statement, Jun 20, 8:55 AM 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
Jun 20, 8:48 AM CDT	Special Weather Statement	DMX	Butler, Franklin, Wright	57 min
Jun 20, 10:25 AM CDT	Special Weather Statement	DMX	Tama	20 min
Jun 20, 4:48 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Marion, Poweshiek	42 min
Jun 20, 5:13 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek, Tama	32 min
Jun 20, 5:18 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion	57 min
Jun 20, 5:41 PM CDT	Flash Flood Warning	DMX	Mahaska	6 hr
Jun 20, 5:45 PM CDT	Severe Thunderstorm Warning	DMX	Lucas, Mahaska, Marion, Monroe, Wapello	45 min
Jun 20, 6:18 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Monroe, Wapello	42 min
Jun 20, 6:57 PM CDT	Flash Flood Warning	DMX	Davis, Monroe, Wapello	6 hr
Jun 20, 6:57 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose	48 min

Nearby

Special Weather Statements in Iowa, 2015 Every special weather statement in 2015

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.