Alert archive / Iowa / Special Weather Statements in 2017

Special Weather Statement, NWS Omaha, NE

August 20, 2017Mills County, Montgomery County, Iowa

NWS Omaha, NE issued this special weather statement at Aug 20, 2017, 11:37 AM CDT for Mills County, Montgomery County, Iowa. It was in force for 53 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 20, 2017, 11:37 AM CDT (16:37 UTC)
Expired: Aug 20, 2017, 12:30 PM CDT
In force: 53 min
Issued by: NWS Omaha, NE

Counties Mills County, IA, Montgomery County, IA

The radar

The Omaha radar (KOAX), 95 km from the middle of the area, began a volume at 16:40 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

Topeka, KS (KFOE), launched 12:00Z, 4.6 hours before the alert went out and 213 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: 415 J/kg
Mixed-layer CIN: -346 J/kg
Mixed-layer LCL: 1090 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: -54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.2

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 Omaha, NE wrote its last area forecast discussion before this special weather statement went out at Aug 20, 5:58 AM CDT, 5 hours 39 minutes earlier.

Area forecast discussion, Aug 20, 5:58 AM CDT, 5 hours 39 minutes before

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Hazardous weather outlook, Aug 20, 7:50 AM CDT, 3 hours 47 minutes before

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In the hours before

Special weather statement, Aug 20, 10:04 AM CDT, 1 hour 33 minutes before

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Local storm report, Aug 20, 10:23 AM CDT, 1 hour 14 minutes before

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Special weather statement, Aug 20, 10:46 AM CDT, 51 minutes before

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Local storm report, Aug 20, 10:48 AM CDT, 49 minutes before

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Local storm report, Aug 20, 11:17 AM CDT, 20 minutes before

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Special weather statement, Aug 20, 11:37 AM CDT, 0 minutes before

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The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 19, 9:55 PM CDT	Special Weather Statement	OAX	Boone	50 min
Aug 19, 10:08 PM CDT	Severe Thunderstorm Warning	OAX	Boone, Madison, Platte	37 min
Aug 19, 10:43 PM CDT	Special Weather Statement	OAX	Colfax	47 min
Aug 19, 10:55 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Dodge, Saunders	35 min
Aug 19, 11:35 PM CDT	Flash Flood Watch	OAX	Butler, Colfax, Lancaster, Platte, Saline, Saunders and 1 more	7 hr
Aug 19, 11:57 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy	33 min
Aug 20, 12:21 AM CDT	Special Weather Statement	OAX	Seward	39 min
Aug 20, 1:03 AM CDT	Special Weather Statement	OAX	Gage, Johnson, Lancaster, Otoe	42 min
Aug 20, 2:28 AM CDT	Special Weather Statement	OAX	Nemaha, Pawnee, Richardson	47 min
Aug 20, 4:14 AM CDT	Special Weather Statement	OAX	Butler	31 min
Aug 20, 4:36 AM CDT	Special Weather Statement	OAX	Seward	24 min
Aug 20, 4:52 AM CDT	Special Weather Statement	OAX	Seward	23 min
Aug 20, 4:54 AM CDT	Special Weather Statement	OAX	Lancaster	36 min
Aug 20, 5:01 AM CDT	Severe Thunderstorm Warning	OAX	Lancaster	29 min
Aug 20, 5:17 AM CDT	Special Weather Statement	OAX	Cass	28 min
Aug 20, 6:01 AM CDT	Special Weather Statement	OAX	Saunders	44 min
Aug 20, 7:12 AM CDT	Areal Flood Warning	OAX	Seward	12 hr
Aug 20, 7:42 AM CDT	River Flood Warning	OAX	Butler	41 hr
Aug 20, 7:42 AM CDT	River Flood Warning	OAX	Seward	35 hr
Aug 20, 7:42 AM CDT	River Flood Warning	OAX	Saline	4 days
Aug 20, 7:42 AM CDT	River Flood Warning	OAX	Seward	3 days
Aug 20, 8:14 AM CDT	Special Weather Statement	OAX	Sarpy	46 min
Aug 20, 8:20 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Sarpy, Saunders	25 min
Aug 20, 8:58 AM CDT	Special Weather Statement	OAX	Cass	47 min
Aug 20, 9:23 AM CDT	Special Weather Statement	OAX	Mills	22 min
Aug 20, 10:04 AM CDT	Special Weather Statement	OAX	Fremont	41 min
Aug 20, 10:46 AM CDT	Special Weather Statement	OAX	Mills	44 min
Aug 20, 11:29 AM CDT	Areal Flood Advisory	OAX	Mills	3 hr

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.