Alert archive / Iowa / Special Weather Statements in 2018

Special Weather Statement, NWS Des Moines, IA

June 11, 20186 counties in Iowa

NWS Des Moines, IA issued this special weather statement at Jun 11, 2018, 7:39 AM CDT for 6 counties in Iowa. It was in force for 3 hr. 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 11, 2018, 7:39 AM CDT (12:39 UTC)
Expired: Jun 11, 2018, 10:30 AM CDT
In force: 3 hr
Issued by: NWS Des Moines, IA

Counties Boone County, IA, Hamilton County, IA, Jasper County, IA, Marshall County, IA, Polk County, IA, Story County, IA

The radar

The Des Moines radar (KDMX), 32 km from the middle of the area, began a volume at 12:41 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, 0.7 hours before the alert went out and 249 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: 638 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 33 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 Jun 11, 6:52 AM CDT, 47 minutes earlier.

Area forecast discussion, Jun 11, 6:52 AM CDT, 47 minutes before

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Hazardous weather outlook, Jun 11, 5:14 AM CDT, 2 hours 25 minutes before

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In the hours before

Local storm report, Jun 11, 6:32 AM CDT, 1 hour 7 minutes before

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Special weather statement, Jun 11, 6:41 AM CDT, 58 minutes before

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Local storm report, Jun 11, 7:25 AM CDT, 14 minutes before

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Local storm report, Jun 11, 7:31 AM CDT, 8 minutes before

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Local storm report, Jun 11, 7:36 AM CDT, 3 minutes before

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Special weather statement, Jun 11, 7:39 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 10, 8:23 PM CDT	Special Weather Statement	DMX	Warren	52 min
Jun 10, 8:34 PM CDT	Special Weather Statement	DMX	Dallas	41 min
Jun 10, 9:04 PM CDT	Special Weather Statement	DMX	Warren	41 min
Jun 10, 9:08 PM CDT	Severe Thunderstorm Warning	DMX	Clarke	37 min
Jun 10, 9:25 PM CDT	Special Weather Statement	DMX	Dallas	50 min
Jun 10, 9:43 PM CDT	Special Weather Statement	DMX	Polk	47 min
Jun 10, 9:53 PM CDT	Flash Flood Watch	DMX	Appanoose, Boone, Clarke, Dallas, Decatur, Greene and 11 more	10 hr
Jun 10, 10:00 PM CDT	Special Weather Statement	DMX	Lucas	60 min
Jun 10, 10:24 PM CDT	Special Weather Statement	DMX	Boone, Clarke, Dallas, Greene, Lucas, Madison and 2 more	51 min
Jun 11, 12:04 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur	41 min
Jun 11, 12:21 AM CDT	Severe Thunderstorm Warning	DMX	Ringgold, Union	39 min
Jun 11, 12:43 AM CDT	Severe Thunderstorm Warning	DMX	Decatur, Ringgold	62 min
Jun 11, 1:37 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Dallas, Guthrie, Madison	42 min
Jun 11, 1:45 AM CDT	Severe Thunderstorm Warning	DMX	Decatur, Wayne	30 min
Jun 11, 3:13 AM CDT	Special Weather Statement	DMX	Pocahontas	47 min
Jun 11, 3:17 AM CDT	Special Weather Statement	DMX	Union	43 min
Jun 11, 3:20 AM CDT	Special Weather Statement	DMX	Adair, Cass	40 min
Jun 11, 3:33 AM CDT	Special Weather Statement	DMX	Audubon	42 min
Jun 11, 3:42 AM CDT	Special Weather Statement	DMX	Palo Alto	63 min
Jun 11, 4:08 AM CDT	Special Weather Statement	DMX	Pocahontas	52 min
Jun 11, 4:45 AM CDT	Special Weather Statement	DMX	Palo Alto	45 min
Jun 11, 5:00 AM CDT	Flash Flood Warning	DMX	Palo Alto	6 hr
Jun 11, 5:32 AM CDT	Flash Flood Warning	DMX	Audubon, Cass	6 hr
Jun 11, 6:41 AM CDT	Special Weather Statement	DMX	Emmet	49 min
Jun 11, 11:10 AM CDT	Special Weather Statement	DMX	Audubon	35 min
Jun 11, 11:14 AM CDT	Special Weather Statement	DMX	Cass	31 min
Jun 11, 11:50 AM CDT	Special Weather Statement	DMX	Adair	25 min
Jun 11, 11:53 AM CDT	Special Weather Statement	DMX	Adams	37 min
Jun 11, 6:11 PM CDT	Severe Thunderstorm Warning	DMX	Cass	32 min

Nearby

Special Weather Statements in Iowa, 2018 Every special weather statement in 2018

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.