Alert archive / Nebraska / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 15, NWS Omaha, NE

April 12, 2015Cuming County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Apr 12, 2015, 7:04 PM CDT for Cuming County, Nebraska. It was in force for 27 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: Apr 12, 2015, 7:04 PM CDT (00:04 UTC)
Expired: Apr 12, 2015, 7:31 PM CDT
In force: 27 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Cuming County, NE

The radar

The Omaha radar (KOAX), 75 km from the middle of the area, began a volume at 00:07 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

Topeka, KS (KFOE), launched 00:00Z, 0.1 hours before the alert went out and 338 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: 93 J/kg
Mixed-layer CIN: -361 J/kg
Mixed-layer LCL: 1112 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 232 m²/s²
0-3 km storm-relative helicity: 268 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 Apr 12, 3:00 PM CDT, 4 hours 4 minutes earlier.

Area forecast discussion, Apr 12, 3:00 PM CDT, 4 hours 4 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
300 PM CDT SUN APR 12 2015

.SHORT TERM...(TONIGHT THROUGH WEDNESDAY)
ISSUED AT 250 PM CDT SUN APR 12 2015

LATEST MSAS SFC ANALYSY DEPICTING A TROF/COLD FRONT WITH THE LEADING
EDGE OF THE BNDRY FROM ABOUT NW MN TO THE NEB PANHANDLE WITH MLCAPES
AROUND 1000J/KG. EXPECT CONVECTION TO BE UNDERWAY WITHIN A COUPLE
HOURS ON NOSE OF LLVL LAPSE RATE AXIS EXTENDING FROM THE NRN CWA TO
CNTRL NEB. WET BULB ZERO HIGHS LATE THIS AFTN WOULD SEEM TO FAVOR
SOME LARGE HAIL WITH A FEW STORMS MAINLY ALONG AND SOUTH OF I-80.
POTENTIALLY FOR HEAVY RAINFALL...AN INCH OR ASO...LOOKS PROMISING AS
WELL TO THE SOUTH WHERE COMBINATION OF HIGH PRECIP WATER/LLVL RH
PHASE. BOTH THE HRRR/RAP13 ARE IN AGREEMENT PCPN ACTIVITY SHOULD BE
CLEAR OF THE CWA SHORTLY AFTER MIDNIGHT.

HIGH PRESSURE BUILDS INTO AND ACROSS THE AREA MONDAY THROUGH
TUESDAY WITH INCREASING SOUTHERLY FLOW BY TUESDAY NIGHT.
COMBINATION OF MOISTURE RETURN AND MID LEVEL WAVE LIFTING ACROSS
THE REGION IN ADVANCE OF STRONG UPPER TROUGH DIGGING TOWARD THE
CENTRAL ROCKIES WILL PROVIDE ANOTHER CHANCE OF SHOWERS AND
THUNDERSTORMS FOR THE AREA TUESDAY NIGHT INTO WEDNESDAY.

.LONG TERM...(WEDNESDAY NIGHT THROUGH SUNDAY)
ISSUED AT 250 PM CDT SUN APR 12 2015

EXTENDED PORTION OF THE FORECAST CONTINUES TO BE RATHER MESSY WITH
REGARDS TO PRECIP AND MODELS HANDLING OF CUT OFF UPPER LOW. LOW
CONFIDENCE AT THIS TIME DUE TO SIGNIFICANT DIFFERENCES BETWEEN THE
OPERATIONAL GFS AND EURO WITH TREND TOWARD BLENDED GUIDANCE. THIS
WILL ALSO IMPACT TEMPERATURES DEPENDING ON THE TEMPORAL AND AREAL
EXTENT OF THE PRECIP DURING THIS TIME.

&&

.AVIATION...(18Z TAFS FOR KOFK...KLNK AND KOMA.)
ISSUED AT 1220 PM CDT SUN APR 12 2015

APPEARS LIKELY THAT LINE OF TSRA WILL DEVELOP LATE THIS AFTN
ALONG A COLD FRONT MOVING THRU ERN NEB...WITH THE FRONTAL
PASSAGE/WIND SHIFT TO NW...AT KOFK AROUND 23Z...AND AROUND 02Z AT
BOTH KOMA AND KLNK. THUS HAVE INCLUDED TEMPO GROUPS AT ALL
TERMINALS TO COVER OCCASIONAL MVFR CONDITIONS. BELIEVE ONLY A FEW
STORMS MAY BE ACCOMPANIED BY HAIL...THUS DID NOT MENTIONS AT ANY
SITES.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...NONE.
IA...NONE.
&&

SHORT TERM...DEE/FOBERT
LONG TERM...FOBERT
AVIATION...DEE

Hazardous weather outlook, Apr 12, 4:12 PM CDT, 2 hours 52 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
412 PM CDT SUN APR 12 2015

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-131115-
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-
412 PM CDT SUN APR 12 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

SCATTERED SHOWERS AND THUNDERSTORMS WERE BEGINNING TO DEVELOP
ALONG A COLD FRONT LOCATED OVER NORTHEAST NEBRASKA LATE THIS
AFTERNOON. THE STORMS WILL SPREAD EAST WITH THE FRONT THROUGH THE
EVENING. ISOLATED STORMS MAY APPROACH SEVERE LEVELS WITH LARGE
HAIL THE PRIMARY HAZARD.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

MORE THUNDERSTORMS ARE POSSIBLE LATER THIS WEEK FROM TUESDAY
NIGHT INTO THE WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED TONIGHT OR MONDAY.

FOBERT

In the hours before

Local storm report, Apr 12, 5:59 PM CDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
559 PM CDT SUN APR 12 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0557 PM     HAIL             6 S COLUMBUS            41.35N 97.36W
04/12/2015  E2.75 INCH       BUTLER             NE   EMERGENCY MNGR

            CLEAR LAKE

&&

DFOBERT

Special weather statement, Apr 12, 6:17 PM CDT, 47 minutes before

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Local storm report, Apr 12, 6:23 PM CDT, 41 minutes before

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Local storm report, Apr 12, 6:40 PM CDT, 24 minutes before

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Local storm report, Apr 12, 6:41 PM CDT, 23 minutes before

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Special weather statement, Apr 12, 6:48 PM CDT, 16 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
Apr 12, 7:08 PM CDT	Special Weather Statement	OAX	Saunders	52 min
Apr 12, 7:15 PM CDT	Special Weather Statement	OAX	Thurston	45 min
Apr 12, 7:28 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	47 min
Apr 12, 7:50 PM CDT	Special Weather Statement	OAX	Douglas, Washington	40 min
Apr 12, 8:12 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy, Saunders	48 min
Apr 12, 8:23 PM CDT	Special Weather Statement	OAX	Jefferson	52 min
Apr 12, 8:52 PM CDT	Special Weather Statement	OAX	Cass	38 min
Apr 12, 9:00 PM CDT	Special Weather Statement	OAX	Gage	60 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.