Alert archive / Iowa / Special Weather Statements in 2017

Special Weather Statement, NWS Des Moines, IA

August 21, 20174 counties in Iowa

NWS Des Moines, IA issued this special weather statement at Aug 21, 2017, 6:26 PM CDT for 4 counties in Iowa. It was in force for 64 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 21, 2017, 6:26 PM CDT (23:26 UTC)
Expired: Aug 21, 2017, 7:30 PM CDT
In force: 64 min
Issued by: NWS Des Moines, IA

Counties Black Hawk County, IA, Grundy County, IA, Marshall County, IA, Tama County, IA

The radar

The Des Moines radar (KDMX), 111 km from the middle of the area, began a volume at 23:27 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 306 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: 1321 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 21, 4:07 PM CDT, 2 hours 19 minutes earlier.

Area forecast discussion, Aug 21, 4:07 PM CDT, 2 hours 19 minutes before

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Hazardous weather outlook, Aug 21, 4:14 PM CDT, 2 hours 12 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
414 PM CDT Mon Aug 21 2017

IAZ004>007-015>017-023>026-033>036-044>046-222115-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Sac-Calhoun-Webster-Hamilton-
Crawford-Carroll-Greene-
414 PM CDT Mon Aug 21 2017

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Tonight

There is a slight risk for severe storms through this evening.
All modes of severe weather is possible along with heavy rainfall
which could lead to localized flooding west.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Scattered non-severe thunderstorms are possible Saturday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this evening.

IAZ027-028-037>039-047>050-057>062-070>075-081>086-092>097-222115-
Butler-Bremer-Hardin-Grundy-Black Hawk-Boone-Story-Marshall-Tama-
Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass-Adair-Madison-
Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas-Monroe-Wapello-
Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis-
414 PM CDT Mon Aug 21 2017

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Tonight

Showers and thunderstorms are likely through tonight. A few storms
could be strong, with strong winds and small hail the main
threats. Localized urban and small stream flooding is
possible...especially west.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Scattered non-severe thunderstorms are possible Saturday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely not be needed this evening, and
will not be needed the rest of the week.

Kotenberg

In the hours before

Local storm report, Aug 21, 4:08 PM CDT, 2 hours 18 minutes before

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Special weather statement, Aug 21, 5:03 PM CDT, 1 hour 23 minutes before

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Special weather statement, Aug 21, 5:37 PM CDT, 49 minutes before

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Special weather statement, Aug 21, 6:04 PM CDT, 22 minutes before

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Special weather statement, Aug 21, 6:16 PM CDT, 10 minutes before

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Special weather statement, Aug 21, 6:26 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 20, 11:03 PM CDT	Special Weather Statement	DMX	Crawford	27 min
Aug 20, 11:05 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford, Sac	40 min
Aug 21, 12:32 AM CDT	Flash Flood Warning	DMX	Crawford	6 hr
Aug 21, 1:27 AM CDT	Special Weather Statement	DMX	Audubon, Guthrie	33 min
Aug 21, 1:31 AM CDT	Flash Flood Warning	DMX	Audubon, Carroll, Crawford, Guthrie	6 hr
Aug 21, 1:53 AM CDT	Special Weather Statement	DMX	Cass	22 min
Aug 21, 1:55 AM CDT	Severe Thunderstorm Warning	DMX	Emmet, Palo Alto	35 min
Aug 21, 2:07 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Audubon, Cass, Guthrie	53 min
Aug 21, 2:46 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass, Guthrie, Madison, Union	44 min
Aug 21, 3:02 AM CDT	Special Weather Statement	DMX	Kossuth	43 min
Aug 21, 3:30 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Ringgold, Taylor, Union	32 min
Aug 21, 9:43 AM CDT	Special Weather Statement	DMX	Calhoun, Humboldt, Pocahontas, Webster	62 min
Aug 21, 11:23 AM CDT	Special Weather Statement	DMX	Humboldt, Pocahontas	52 min
Aug 21, 1:39 PM CDT	Special Weather Statement	DMX	Emmet, Kossuth, Palo Alto	66 min
Aug 21, 2:02 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Kossuth, Palo Alto	29 min
Aug 21, 3:43 PM CDT	Special Weather Statement	DMX	Calhoun, Carroll, Crawford, Emmet, Humboldt, Kossuth and 4 more	77 min
Aug 21, 5:03 PM CDT	Special Weather Statement	DMX	Audubon, Boone, Cass, Dallas, Greene, Guthrie and 4 more	57 min
Aug 21, 5:37 PM CDT	Special Weather Statement	DMX	Boone, Grundy, Hamilton, Hardin, Story	53 min
Aug 21, 6:04 PM CDT	Special Weather Statement	DMX	Jasper, Polk	41 min
Aug 21, 6:16 PM CDT	Special Weather Statement	DMX	Madison, Warren	44 min
Aug 21, 6:38 PM CDT	Special Weather Statement	DMX	Jasper, Mahaska, Marion	52 min
Aug 21, 6:52 PM CDT	Special Weather Statement	DMX	Clarke, Lucas, Madison, Union, Warren	68 min
Aug 21, 6:58 PM CDT	Special Weather Statement	DMX	Poweshiek	47 min

Nearby

Special Weather Statements in Iowa, 2017 Every special weather statement in 2017

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.