Alert archive / Iowa / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 215, NWS Omaha, NE

June 30, 2017Harrison County, Monona County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jun 30, 2017, 6:34 PM CDT for Harrison County, Monona County, Iowa. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 30, 2017, 6:34 PM CDT (23:34 UTC)
Expired: Jun 30, 2017, 7:00 PM CDT
In force: 26 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Harrison County, IA, Monona County, IA

The radar

The Omaha radar (KOAX), 73 km from the middle of the area, began a volume at 23:35 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, 11.6 hours before the alert went out and 380 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: 1236 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -77 m²/s²
0-3 km storm-relative helicity: -32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jun 30, 3:56 PM CDT, 2 hours 38 minutes earlier.

Area forecast discussion, Jun 30, 3:56 PM CDT, 2 hours 38 minutes before

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Hazardous weather outlook, Jun 30, 4:25 PM CDT, 2 hours 9 minutes before

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In the hours before

Special weather statement, Jun 30, 5:48 PM CDT, 46 minutes before

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Special weather statement, Jun 30, 5:51 PM CDT, 43 minutes before

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Special weather statement, Jun 30, 6:17 PM CDT, 17 minutes before

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Special weather statement, Jun 30, 6:25 PM CDT, 9 minutes before

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Special weather statement, Jun 30, 6:29 PM CDT, 5 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
Jun 29, 7:11 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Cuming, Dodge, Stanton	34 min
Jun 29, 7:39 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Colfax, Cuming, Dodge, Stanton	36 min
Jun 29, 8:04 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Dodge	26 min
Jun 29, 8:06 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Colfax, Cuming, Dodge, Washington	24 min
Jun 29, 8:24 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Washington	36 min
Jun 29, 8:28 PM CDT	Special Weather Statement	OAX	Butler, Dodge	32 min
Jun 29, 8:54 PM CDT	Special Weather Statement	OAX	Douglas, Saunders, Washington	51 min
Jun 29, 9:13 PM CDT	Severe Thunderstorm Warning	OAX	Dodge, Douglas, Saunders	32 min
Jun 29, 9:16 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Washington	29 min
Jun 29, 9:32 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy	28 min
Jun 29, 9:42 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy, Saunders	33 min
Jun 29, 9:45 PM CDT	Severe Thunderstorm Warning	OAX	Douglas	30 min
Jun 29, 9:46 PM CDT	Severe Thunderstorm Warning	OAX	Douglas	29 min
Jun 29, 9:55 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy	35 min
Jun 29, 10:07 PM CDT	Areal Flood Advisory	OAX	Douglas, Sarpy	3 hr
Jun 29, 10:26 PM CDT	Severe Thunderstorm Warning	OAX	Sarpy	34 min
Jun 29, 10:42 PM CDT	Severe Thunderstorm Warning	OAX	Cass	33 min
Jun 29, 10:52 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Seward	38 min
Jun 29, 10:58 PM CDT	Severe Thunderstorm Warning	OAX	Cass	32 min
Jun 29, 11:29 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Otoe	31 min
Jun 29, 11:48 PM CDT	Special Weather Statement	OAX	Sarpy	42 min
Jun 30, 12:00 AM CDT	Severe Thunderstorm Warning	OAX	Johnson, Lancaster, Otoe	45 min
Jun 30, 12:00 AM CDT	Severe Thunderstorm Warning	OAX	Sarpy	17 min
Jun 30, 12:59 AM CDT	Special Weather Statement	OAX	Richardson	46 min
Jun 30, 5:48 PM CDT	Special Weather Statement	OAX	Dodge	27 min
Jun 30, 5:51 PM CDT	Special Weather Statement	OAX	Butler	24 min
Jun 30, 6:17 PM CDT	Special Weather Statement	OAX	Dodge	28 min
Jun 30, 6:25 PM CDT	Special Weather Statement	OAX	Dodge	35 min
Jun 29, 7:13 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Monona, Shelby	32 min
Jun 29, 7:23 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Pottawattamie	37 min
Jun 29, 7:56 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Pottawattamie, Shelby	34 min
Jun 29, 8:26 PM CDT	Special Weather Statement	OAX	Shelby	34 min
Jun 29, 10:39 PM CDT	Severe Thunderstorm Warning	OAX	Montgomery, Pottawattamie	36 min
Jun 29, 11:26 PM CDT	Severe Thunderstorm Warning	OAX	Fremont, Mills, Montgomery, Page	34 min
Jun 29, 11:58 PM CDT	Severe Thunderstorm Warning	OAX	Page	20 min
Jun 30, 6:29 PM CDT	Special Weather Statement	OAX	Harrison	31 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2017 Every severe thunderstorm warning 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.