Alert archive / Iowa / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 110, NWS Omaha, NE

July 2, 2019Douglas County, Washington County, Nebraska; Harrison County, Pottawattamie County, Shelby County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jul 2, 2019, 4:17 PM CDT for Douglas County, Washington County, Nebraska; Harrison County, Pottawattamie County, Shelby County, Iowa. It was in force for 43 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: Jul 2, 2019, 4:17 PM CDT (21:17 UTC)
Expired: Jul 2, 2019, 5:00 PM CDT
In force: 43 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Harrison County, IA, Pottawattamie County, IA, Shelby County, IA, Douglas County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 51 km from the middle of the area, began a volume at 21:20 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

Omaha, NE (KOAX), launched 12:00Z, 9.3 hours before the alert went out and 51 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: 653 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 1435 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 Jul 2, 3:12 PM CDT, 1 hour 5 minutes earlier.

Area forecast discussion, Jul 2, 3:12 PM CDT, 1 hour 5 minutes before

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Hazardous weather outlook, Jul 2, 11:20 AM CDT, 4 hours 57 minutes before

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In the hours before

Special weather statement, Jul 2, 3:31 PM CDT, 46 minutes before

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Special weather statement, Jul 2, 3:49 PM CDT, 28 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
Jul 1, 10:18 PM CDT	Areal Flood Advisory	OAX	Antelope, Cedar, Knox, Madison, Pierce, Wayne	4 hr
Jul 2, 3:31 PM CDT	Special Weather Statement	OAX	Saunders	29 min
Jul 2, 6:03 PM CDT	Special Weather Statement	OAX	Douglas	27 min
Jul 2, 6:28 PM CDT	Special Weather Statement	OAX	Douglas	32 min
Jul 2, 3:49 PM CDT	Special Weather Statement	OAX	Shelby	26 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2019 Severe Thunderstorm Warnings in Nebraska, 2019 Every severe thunderstorm warning in 2019

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.