Alert archive / Iowa / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 192, NWS Omaha, NE

August 10, 2015Page County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Aug 10, 2015, 2:22 AM CDT for Page County, Iowa. It was in force for 23 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: Aug 10, 2015, 2:22 AM CDT (07:22 UTC)
Expired: Aug 10, 2015, 2:45 AM CDT
In force: 23 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Page County, IA

The radar

The Omaha radar (KOAX), 121 km from the middle of the area, began a volume at 07:24 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, 7.4 hours before the alert went out and 121 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: 1926 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 1109 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 40 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 Aug 10, 12:25 AM CDT, 1 hour 57 minutes earlier.

Area forecast discussion, Aug 10, 12:25 AM CDT, 1 hour 57 minutes before

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Hazardous weather outlook, Aug 9, 4:32 PM CDT, 9 hours 50 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
432 PM CDT SUN AUG 9 2015

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-101145-
MONONA-HARRISON-SHELBY-POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT-
PAGE-KNOX-CEDAR-THURSTON-ANTELOPE-PIERCE-WAYNE-BOONE-MADISON-
STANTON-CUMING-BURT-PLATTE-COLFAX-DODGE-WASHINGTON-BUTLER-
SAUNDERS-DOUGLAS-SARPY-SEWARD-LANCASTER-CASS-OTOE-SALINE-
JEFFERSON-GAGE-JOHNSON-NEMAHA-PAWNEE-RICHARDSON-
432 PM CDT SUN AUG 9 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST
IOWA...WEST CENTRAL IOWA...EAST CENTRAL NEBRASKA...NORTHEAST
NEBRASKA AND SOUTHEAST NEBRASKA.

.DAY ONE...TONIGHT AND MONDAY

SEVERE THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS ARE
POSSIBLE IN NORTHEAST NEBRASKA EARLY THIS EVENING. THEN MORE
SEVERE THUNDERSTORMS WITH DAMAGING WINDS ARE POSSIBLE THROUGH
ABOUT MIDNIGHT AS FAR SOUTHEAST AS INTERSTATE 80.

SCATTERED THUNDERSTORMS AT LATE AFTERNOON ALONG A WEAK SURFACE
BOUNDARY IN NORTHEAST NEBRASKA COULD PRODUCE LARGE HAIL AND
DAMAGING WINDS. A BETTER CHANCE FOR SEVERE STORMS WILL COME FROM A
COLD FRONT MOVING SOUTHEAST FROM SOUTH DAKOTA...SCHEDULED TO
ARRIVE IN NORTHEAST NEBRASKA AT EARLY EVENING...THEN PROGRESS
TOWARD INTERSTATE 80 AROUND MIDNIGHT. INSTABILITY AND SHEAR WILL
BOTH BE CONDUCIVE FOR DAMAGING WINDS THROUGH THE EVENING BEFORE
STORMS WEAKEN AFTER MIDNIGHT.

SCATTERED THUNDERSTORMS WILL LIKELY LINGER OVER MUCH OF EASTERN
NEBRASKA AND SOUTHWEST IOWA THROUGH THE NIGHT...ENDING FROM
NORTHWEST TO SOUTHEAST AFTER MIDNIGHT. BY MONDAY MORNING...MOST OF
THE ACTIVITY WILL HAVE MOVED EAST OF NEBRASKA AND SOUTHWEST IOWA.
THERE IS A SMALL CHANCE NON SEVERE THUNDERSTORMS COULD POP UP
MONDAY AFTERNOON IN SOUTHWEST IOWA.

FLOODING WILL REMAIN POSSIBLE ALONG THE NISHNABOTNA RIVER NEAR
HAMBURG AND THE WEST NISHNABOTNA NEAR RIVERTON AS WATER FROM
SUNDAY NIGHT RAINFALL CONTINUES TO MOVE DOWN THOSE WATERWAYS.

.DAYS TWO THROUGH SEVEN...MONDAY NIGHT THROUGH SUNDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING IN PART OF NORTHEAST
AND EAST CENTRAL NEBRASKA...AS WELL AS WEST CENTRAL IOWA.

In the hours before

Special weather statement, Aug 9, 11:14 PM CDT, 3 hours 8 minutes before

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Special weather statement, Aug 9, 11:24 PM CDT, 2 hours 58 minutes before

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Special weather statement, Aug 9, 11:36 PM CDT, 2 hours 46 minutes before

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Special weather statement, Aug 10, 12:09 AM CDT, 2 hours 13 minutes before

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Special weather statement, Aug 10, 12:57 AM CDT, 1 hour 25 minutes before

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Special weather statement, Aug 10, 1:51 AM CDT, 31 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
Aug 9, 7:05 PM CDT	Severe Thunderstorm Warning	OAX	Boone, Madison, Platte	40 min
Aug 9, 7:28 PM CDT	Special Weather Statement	OAX	Boone	47 min
Aug 9, 7:46 PM CDT	Special Weather Statement	OAX	Boone	44 min
Aug 9, 8:34 PM CDT	Special Weather Statement	OAX	Cedar	41 min
Aug 9, 11:36 PM CDT	Special Weather Statement	OAX	Douglas	39 min
Aug 10, 12:09 AM CDT	Special Weather Statement	OAX	Douglas	36 min
Aug 9, 10:16 PM CDT	Severe Thunderstorm Warning	OAX	Monona	29 min
Aug 9, 10:42 PM CDT	Severe Thunderstorm Warning	OAX	Monona	33 min
Aug 9, 11:14 PM CDT	Special Weather Statement	OAX	Shelby	46 min
Aug 9, 11:24 PM CDT	Special Weather Statement	OAX	Pottawattamie	51 min
Aug 10, 12:57 AM CDT	Special Weather Statement	OAX	Fremont, Montgomery, Page	33 min
Aug 10, 1:51 AM CDT	Special Weather Statement	OAX	Fremont, Page	39 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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.