Alert archive / Iowa / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 137, NWS Omaha, NE

June 5, 2014Harrison County, Monona County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jun 5, 2014, 4:59 PM CDT for Harrison County, Monona County, Iowa. 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: Jun 5, 2014, 4:59 PM CDT (21:59 UTC)
Expired: Jun 5, 2014, 5:23 PM CDT
In force: 24 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 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 21:58 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 5, 4:55 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.0 hours before the alert went out and 73 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: 446 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 593 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 51 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 5, 3:22 PM CDT, 1 hour 37 minutes earlier.

Area forecast discussion, Jun 5, 3:22 PM CDT, 1 hour 37 minutes before

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Hazardous weather outlook, Jun 5, 4:33 PM CDT, 26 minutes before

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In the hours before

Special weather statement, Jun 5, 4:07 PM CDT, 52 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
407 PM CDT THU JUN 5 2014

NEZ033-034-052145-
BURT NE-CUMING NE-
407 PM CDT THU JUN 5 2014

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL BURT AND EASTERN CUMING
COUNTIES UNTIL 445 PM CDT...

AT 407 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
LYONS...OR 37 MILES SOUTH OF SIOUX CITY...MOVING SOUTHEAST AT 20 MPH.

NICKEL SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
LYONS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
OFFICE IN OMAHA.

&&

LAT...LON 4194 9657 4199 9647 4183 9617 4180 9630
TIME...MOT...LOC 2107Z 298DEG 17KT 4196 9650

DEE

Special weather statement, Jun 5, 4:20 PM CDT, 39 minutes before

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Local storm report, Jun 5, 4:24 PM CDT, 35 minutes before

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Local storm report, Jun 5, 4:32 PM CDT, 27 minutes before

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Local storm report, Jun 5, 4:39 PM CDT, 20 minutes before

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Special weather statement, Jun 5, 4:44 PM CDT, 15 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 5, 6:29 AM CDT	River Flood Warning	OAX	Saline	57 hr
Jun 5, 2:26 PM CDT	Special Weather Statement	OAX	Thurston	34 min
Jun 5, 2:31 PM CDT	Severe Thunderstorm Warning	OAX	Thurston	29 min
Jun 5, 3:01 PM CDT	Special Weather Statement	OAX	Thurston	44 min
Jun 5, 3:03 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Thurston	27 min
Jun 5, 3:14 PM CDT	Special Weather Statement	OAX	Thurston	31 min
Jun 5, 3:17 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Thurston	43 min
Jun 5, 3:30 PM CDT	Severe Thunderstorm Warning	OAX	Thurston	45 min
Jun 5, 3:57 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Thurston	33 min
Jun 5, 4:07 PM CDT	Special Weather Statement	OAX	Burt	38 min
Jun 5, 4:12 PM CDT	Severe Thunderstorm Warning	OAX	Burt	33 min
Jun 5, 4:20 PM CDT	Special Weather Statement	OAX	Burt	40 min
Jun 5, 4:44 PM CDT	Special Weather Statement	OAX	Burt	46 min
Jun 5, 5:12 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Washington	38 min
Jun 5, 5:36 PM CDT	Special Weather Statement	OAX	Washington	39 min
Jun 5, 6:41 PM CDT	Severe Thunderstorm Warning	OAX	Douglas	34 min
Jun 5, 4:14 PM CDT	Severe Thunderstorm Warning	OAX	Monona	46 min
Jun 5, 4:32 PM CDT	Severe Thunderstorm Warning	OAX	Monona	43 min
Jun 5, 5:26 PM CDT	Special Weather Statement	OAX	Harrison	49 min
Jun 5, 5:51 PM CDT	Special Weather Statement	OAX	Harrison	24 min
Jun 5, 5:53 PM CDT	Special Weather Statement	OAX	Harrison	37 min
Jun 5, 6:24 PM CDT	Special Weather Statement	OAX	Pottawattamie	51 min
Jun 5, 6:33 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie	27 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2014 Every severe thunderstorm warning in 2014

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.