Alert archive / Nebraska / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 133, NWS Omaha, NE

July 17, 20154 counties in Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Jul 17, 2015, 8:32 PM CDT for 4 counties in Nebraska. It was in force for 28 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: Jul 17, 2015, 8:32 PM CDT (01:32 UTC)
Expired: Jul 17, 2015, 9:00 PM CDT
In force: 28 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Antelope County, NE, Cedar County, NE, Knox County, NE, Pierce County, NE

The radar

The Sioux Falls radar (KFSD), 152 km from the middle of the area, began a volume at 01:34 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, 1.5 hours before the alert went out and 165 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: 3350 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 1845 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 9.7

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 Jul 17, 7:12 PM CDT, 1 hour 20 minutes earlier.

Area forecast discussion, Jul 17, 7:12 PM CDT, 1 hour 20 minutes before

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Hazardous weather outlook, Jul 17, 6:02 PM CDT, 2 hours 30 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
602 PM CDT FRI JUL 17 2015

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-181315-
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-
602 PM CDT FRI JUL 17 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 SATURDAY

A FEW SEVERE THUNDERSTORMS ARE POSSIBLE THIS EVENING IN NORTHEAST
NEBRASKA. STORMS EARLY IN THE EVENING COULD PRODUCE LARGE HAIL AND
DAMAGING WINDS...WITH STORMS LATER IN THE EVENING HAVING DAMAGING
WINDS AS THE PRIMARY THREAT.

STORMS FIRING ALONG A WEAK WIND SHIFT LINE FROM NEAR NELIGH TO
WAYNE WILL CONTINUE THIS EVENING. THEN MORE STORMS IN CENTRAL AND
WESTERN NEBRASKA COULD MOVE ACROSS NORTHEAST NEBRASKA LATER THIS
EVENING AS WELL.

OVERNIGHT...SCATTERED THUNDERSTORMS ARE POSSIBLE ACROSS SOUTHEAST
NEBRASKA AND SOUTHWEST IOWA. HOWEVER SEVERE STORMS ARE NOT
ANTICIPATED HERE. ALL THUNDERSTORMS SHOULD BE MOVING OUT OF THE
AREA BY MID SATURDAY MORNING.

HEAT INDEX BETWEEN 100 AND 110 WILL CONTINUE INTO THE
EVENING IN EAST CENTRAL AND SOUTHEAST NEBRASKA...AS WELL AS
SOUTHWEST IOWA...AND A HEAT ADVISORY REMAINS IN EFFECT THROUGH 8
PM.

ANOTHER HEAT ADVISORY WILL GO INTO SATURDAY AFTERNOON FOR
SOUTHEAST NEBRASKA AND SOUTHWEST IOWA WHEN HEAT INDICES WILL AGAIN
TOP 105.

.DAYS TWO THROUGH SEVEN...SATURDAY NIGHT THROUGH FRIDAY

THERE WILL BE A CHANCE OF THUNDERSTORMS AGAIN SATURDAY NIGHT
THROUGH SUNDAY NIGHT...MAINLY OVER SOUTHEAST NEBRASKA AND
SOUTHWEST IOWA. A SMALL CHANCE OF STORMS WILL PERSIST THROUGH THE
UPCOMING WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED ACROSS NORTHEAST NEBRASKA
TONIGHT.

In the hours before

Special weather statement, Jul 17, 5:27 PM CDT, 3 hours 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
527 PM CDT FRI JUL 17 2015

NEZ016-017-031-172300-
ANTELOPE NE-PIERCE NE-MADISON NE-
527 PM CDT FRI JUL 17 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN ANTELOPE...
NORTHWESTERN MADISON AND SOUTHERN PIERCE COUNTIES UNTIL 600 PM CDT...

AT 526 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
OAKDALE...OR 25 MILES WEST OF NORFOLK...MOVING NORTHEAST AT 20 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
PIERCE...NELIGH...OAKDALE...MEADOW GROVE...HADAR...TILDEN...FOSTER
AND WILLOW CREEK STATE RECREATION AREA.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 HIGHWAY 275 IN NEBRASKA BETWEEN MILE MARKERS 41 AND 57.
 HIGHWAY 81 IN NEBRASKA BETWEEN MILEMARKERS 163 AND 166.

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.

LAT...LON 4235 9759 4211 9737 4196 9799 4208 9814
TIME...MOT...LOC 2226Z 237DEG 24KT 4208 9791

KG

Local storm report, Jul 17, 6:23 PM CDT, 2 hours 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
623 PM CDT FRI JUL 17 2015

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

0600 PM     HAIL             2 NE OAKDALE            42.09N 97.94W
07/17/2015  E1.00 INCH       ANTELOPE           NE   LAW ENFORCEMENT

0615 PM     HAIL             NELIGH                  42.13N 98.03W
07/17/2015  M1.00 INCH       ANTELOPE           NE   LAW ENFORCEMENT

&&

SD

Local storm report, Jul 17, 8:08 PM CDT, 24 minutes before

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Local storm report, Jul 17, 8:13 PM CDT, 19 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
Jul 17, 7:02 PM CDT	Flash Flood Warning	OAX	Antelope, Pierce	3 hr
Jul 17, 7:16 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Pierce	44 min
Jul 17, 8:19 PM CDT	Severe Thunderstorm Warning	OAX	Knox	41 min
Jul 17, 8:46 PM CDT	Severe Thunderstorm Warning	OAX	Knox	44 min
Jul 17, 9:09 PM CDT	Special Weather Statement	OAX	Cedar	51 min
Jul 17, 9:19 PM CDT	Severe Thunderstorm Warning	OAX	Knox	41 min
Jul 17, 9:25 PM CDT	Severe Thunderstorm Warning	OAX	Knox	35 min
Jul 17, 9:27 PM CDT	Severe Thunderstorm Warning	OAX	Boone	33 min
Jul 17, 10:10 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Pierce, Wayne	50 min
Jul 17, 10:20 PM CDT	Special Weather Statement	OAX	Boone	40 min
Jul 17, 10:39 PM CDT	Areal Flood Advisory	OAX	Boone	3 hr
Jul 18, 2:01 AM CDT	Areal Flood Advisory	OAX	Boone	3 hr

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.