Alert archive / Nebraska / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 59, NWS Omaha, NE

May 4, 2015Johnson County, Nemaha County, Otoe County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at May 4, 2015, 1:21 AM CDT for Johnson County, Nemaha County, Otoe County, Nebraska. It was in force for 24 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: May 4, 2015, 1:21 AM CDT (06:21 UTC)
Expired: May 4, 2015, 1:45 AM CDT
In force: 24 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Johnson County, NE, Nemaha County, NE, Otoe County, NE

The radar

The Omaha radar (KOAX), 97 km from the middle of the area, began a volume at 06:23 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 00:00Z, 6.4 hours before the alert went out and 97 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: 552 J/kg
Mixed-layer CIN: -245 J/kg
Mixed-layer LCL: 2278 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 113 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 May 4, 12:23 AM CDT, 58 minutes earlier.

Area forecast discussion, May 4, 12:23 AM CDT, 58 minutes before

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Hazardous weather outlook, May 3, 11:20 PM CDT, 2 hours 1 minute before

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In the hours before

Local storm report, May 3, 9:40 PM CDT, 3 hours 41 minutes before

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Local storm report, May 3, 9:41 PM CDT, 3 hours 40 minutes before

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Local storm report, May 3, 10:19 PM CDT, 3 hours 2 minutes before

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Special weather statement, May 3, 10:55 PM CDT, 2 hours 26 minutes before

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Local storm report, May 3, 11:45 PM CDT, 1 hour 36 minutes before

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Special weather statement, May 4, 1:11 AM CDT, 10 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
May 3, 7:11 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Platte	17 min
May 3, 7:19 PM CDT	Severe Thunderstorm Warning	OAX	Cuming	19 min
May 3, 7:23 PM CDT	Severe Thunderstorm Warning	OAX	Cuming	37 min
May 3, 7:29 PM CDT	Severe Thunderstorm Warning	OAX	Johnson	31 min
May 3, 7:40 PM CDT	Severe Thunderstorm Warning	OAX	Cuming, Stanton	19 min
May 3, 7:44 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Otoe	46 min
May 3, 7:46 PM CDT	Areal Flood Advisory	OAX	Cuming	3 hr
May 3, 7:55 PM CDT	Severe Thunderstorm Warning	OAX	Thurston	39 min
May 3, 7:59 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha, Otoe	31 min
May 3, 8:08 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Otoe	37 min
May 3, 8:24 PM CDT	Special Weather Statement	OAX	Cuming	51 min
May 3, 8:30 PM CDT	Tornado Warning	OAX	Gage, Johnson, Lancaster	30 min
May 3, 8:31 PM CDT	Severe Thunderstorm Warning	OAX	Thurston	29 min
May 3, 8:33 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha, Otoe	42 min
May 3, 8:56 PM CDT	Tornado Warning	OAX	Nemaha	34 min
May 3, 9:01 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Johnson, Otoe	29 min
May 3, 9:02 PM CDT	Areal Flood Advisory	OAX	Johnson, Lancaster, Nemaha, Otoe	3 hr
May 3, 9:29 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha, Pawnee	46 min
May 3, 9:31 PM CDT	Severe Thunderstorm Warning	OAX	Nemaha	29 min
May 3, 10:04 PM CDT	Severe Thunderstorm Warning	OAX	Sarpy, Saunders	41 min
May 3, 10:06 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha	24 min
May 3, 10:15 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	30 min
May 3, 10:55 PM CDT	Special Weather Statement	OAX	Gage	50 min
May 3, 11:23 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Pawnee	37 min
May 3, 11:41 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Sarpy, Saunders	34 min
May 3, 11:53 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Saunders	26 min
May 4, 12:17 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Otoe	28 min
May 4, 12:25 AM CDT	Severe Thunderstorm Warning	OAX	Otoe	35 min
May 4, 1:11 AM CDT	Special Weather Statement	OAX	Nemaha, Otoe	49 min
May 4, 2:35 AM CDT	Areal Flood Advisory	OAX	Johnson, Nemaha, Otoe	4 hr
May 4, 6:02 AM CDT	Special Weather Statement	OAX	Cass	43 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2015 Every severe thunderstorm warning in 2015

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.