Alert archive / Iowa / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 37, NWS Omaha, NE

May 16, 2013Harrison County, Shelby County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at May 16, 2013, 6:23 PM CDT for Harrison County, Shelby County, Iowa. It was in force for 37 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 16, 2013, 6:23 PM CDT (23:23 UTC)
Expired: May 16, 2013, 7:00 PM CDT
In force: 37 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Harrison County, IA, Shelby County, IA

The radar

The Omaha radar (KOAX), 78 km from the middle of the area, began a volume at 23:25 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, 11.4 hours before the alert went out and 78 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: 65 J/kg
Mixed-layer CIN: -246 J/kg
Mixed-layer LCL: 1297 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: -12 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 16, 3:25 PM CDT, 2 hours 58 minutes earlier.

Area forecast discussion, May 16, 3:25 PM CDT, 2 hours 58 minutes before

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Hazardous weather outlook, May 16, 4:20 PM CDT, 2 hours 3 minutes before

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In the hours before

Special weather statement, May 16, 1:06 PM CDT, 5 hours 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
106 PM CDT THU MAY 16 2013

NEZ011-016-017-161845-
ANTELOPE NE-PIERCE NE-KNOX NE-
106 PM CDT THU MAY 16 2013

...SIGNIFICANT WEATHER ADVISORY FOR ANTELOPE...NORTHWESTERN PIERCE
AND CENTRAL KNOX COUNTIES UNTIL 145 PM CDT...

AT 104 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES EAST
OF MONOWI TO 7 MILES SOUTH OF CLEARWATER...OR ALONG A LINE EXTENDING
FROM 22 MILES SOUTHEAST OF PICKSTOWN TO 38 MILES WEST OF NORFOLK...
AND MOVING NORTHEAST AT 40 MPH.

HAIL UP TO THE SIZE OF DIMES AND WIND GUSTS UP TO 40 MPH WILL BE
POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
NELIGH...CREIGHTON...VERDIGRE...ORCHARD...CLEARWATER...NIOBRARA...
SANTEE...BRUNSWICK...CENTER...ROYAL...WINNETOON...VERDEL AND BAZILE
MILLS.

LAT...LON 4284 9815 4276 9804 4277 9795 4282 9788
      4286 9788 4287 9783 4217 9782 4192 9825
      4191 9829 4288 9831
TIME...MOT...LOC 1804Z 234DEG 34KT 4284 9821 4207 9818

MILLER

Special weather statement, May 16, 1:52 PM CDT, 4 hours 31 minutes before

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Local storm report, May 16, 2:56 PM CDT, 3 hours 27 minutes before

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Local storm report, May 16, 3:01 PM CDT, 3 hours 22 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 15, 7:20 PM CDT	Special Weather Statement	OAX	Richardson	40 min
May 15, 7:25 PM CDT	Special Weather Statement	OAX	Richardson	50 min
May 15, 7:30 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	45 min
May 15, 7:40 PM CDT	Severe Thunderstorm Warning	OAX	Pawnee	50 min
May 15, 8:09 PM CDT	Special Weather Statement	OAX	Richardson	36 min
May 15, 8:16 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	44 min
May 16, 1:06 PM CDT	Special Weather Statement	OAX	Antelope, Knox	39 min
May 16, 1:52 PM CDT	Special Weather Statement	OAX	Antelope, Boone, Pierce	38 min
May 16, 2:22 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Pierce	23 min
May 16, 2:44 PM CDT	Severe Thunderstorm Warning	OAX	Wayne	31 min
May 16, 3:13 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Wayne	32 min
May 16, 10:59 AM CDT	Special Weather Statement	OAX	Montgomery	31 min
May 16, 11:18 AM CDT	Areal Flood Advisory	OAX	Pottawattamie	3 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2013 Every severe thunderstorm warning in 2013

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.