Alert archive / Nebraska / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 142, NWS Omaha, NE

July 24, 2015Cass County, Sarpy County, Nebraska; Fremont County, Mills County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jul 24, 2015, 7:18 PM CDT for Cass County, Sarpy County, Nebraska; Fremont County, Mills County, Iowa. 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
Jul 24, 2015, 7:18 PM CDT (00:18 UTC)
Expired
Jul 24, 2015, 7:45 PM CDT
In force
27 min
Issued by
NWS Omaha, NE
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Fremont County, IA, Mills County, IA, Cass County, NE, Sarpy County, NE

The radar

The Omaha radar (KOAX), 58 km from the middle of the area, began a volume at 00:19 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, 0.3 hours before the alert went out and 59 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2015-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3998 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2015-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
3998 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
1338 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.8

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 24, 6:14 PM CDT, 1 hour 4 minutes earlier.

Area forecast discussion, Jul 24, 6:14 PM CDT, 1 hour 4 minutes before
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Hazardous weather outlook, Jul 24, 4:32 PM CDT, 2 hours 46 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
432 PM CDT FRI JUL 24 2015

IAZ043-055-056-069-079-080-090-091-NEZ015-033-034-043>045-050>053-
065>068-078-088>093-251145-
MONONA-HARRISON-SHELBY-POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT-
PAGE-THURSTON-CUMING-BURT-COLFAX-DODGE-WASHINGTON-BUTLER-SAUNDERS-
DOUGLAS-SARPY-SEWARD-LANCASTER-CASS-OTOE-SALINE-JEFFERSON-GAGE-
JOHNSON-NEMAHA-PAWNEE-RICHARDSON-
432 PM CDT FRI JUL 24 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 HEAT ADVISORY REMAINS IN EFFECT THROUGH THE EARLY EVENING HOURS
WITH HEAT INDICES VALUES RANGING FROM 105 TO 115 DEGREES.

SCATTERED THUNDERSTORMS WILL BE POSSIBLE TONIGHT AS WELL AS
SATURDAY OVER THE OUTLOOK AREA.

STORMS MAINLY ALONG AND SOUTH OF INTERSTATE 80 MAY APPROACH OR
BECOME SEVERE THIS EVENING WITH DAMAGING WIND AND LARGE HAIL THE
MAIN THREATS. SOME THUNDERSTORMS TONIGHT MAY EVEN CONTAIN HEAVY
RAINFALL...ESPECIALLY IN SOUTHEAST NEBRASKA AND SOUTHWEST IOWA.

.DAYS TWO THROUGH SEVEN...SATURDAY NIGHT THROUGH THURSDAY

THE CHANCE FOR THUNDERSTORMS WILL CONTINUE OVER THE MAJORITY OF
THE OUTLOOK AREA THROUGH LATE NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY NOT BE NEEDED THROUGH SATURDAY.

NEZ011-012-016>018-030>032-042-251145-
KNOX-CEDAR-ANTELOPE-PIERCE-WAYNE-BOONE-MADISON-STANTON-PLATTE-
432 PM CDT FRI JUL 24 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST
NEBRASKA.

.DAY ONE...TONIGHT AND SATURDAY

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS MAINLY AFTER MIDNIGHT.
STORMS ARE NOT EXPECTED TO BECOME SEVERE...BUT MAY BE ACCOMPANIED
BY GUSTY WINDS AND SMALL HAIL.

.DAYS TWO THROUGH SEVEN...SATURDAY NIGHT THROUGH THURSDAY

THE CHANCE FOR THUNDERSTORMS WILL CONTINUE OVER THE MAJORITY OF
THE OUTLOOK AREA THROUGH LATE NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH SATURDAY.

In the hours before

Special weather statement, Jul 24, 6:39 PM CDT, 39 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
639 PM CDT FRI JUL 24 2015

NEZ066>068-078-088>092-250030-
JEFFERSON NE-NEMAHA NE-JOHNSON NE-CASS NE-GAGE NE-LANCASTER NE-
SALINE NE-PAWNEE NE-OTOE NE-
639 PM CDT FRI JUL 24 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SALINE...EASTERN
JEFFERSON...SOUTHWESTERN CASS...NORTHWESTERN JOHNSON...NORTHWESTERN
NEMAHA...GAGE...SOUTHEASTERN LANCASTER...NORTHWESTERN PAWNEE AND
WESTERN OTOE COUNTIES UNTIL 730 PM CDT...

AT 638 PM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR BENNET TO 6 MILES
SOUTHEAST OF WESTERN...AND MOVING SOUTHEAST AT 20 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
BEATRICE...SYRACUSE...WILBER...HICKMAN...WYMORE...BENNET...FIRTH...
PALMYRA...DE WITT...CORTLAND...STERLING...PLYMOUTH...BLUE SPRINGS...
COOK...UNADILLA...ODELL...DILLER...PANAMA...TALMAGE AND CLATONIA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS 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.

IF ON A LAKE...GET OUT OF THE WATER AND MOVE INDOORS OR INSIDE A
VEHICLE. REMEMBER...LIGHTNING CAN STRIKE OUT TO 15 MILES FROM THE
PARENT THUNDERSTORM. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH
TO BE STRUCK BY LIGHTNING. MOVE TO SAFE SHELTER NOW. DO NOT BE
CAUGHT ON THE WATER IN A THUNDERSTORM.

&&

LAT...LON 4000 9692 4031 9724 4079 9646 4057 9595
      4000 9683
TIME...MOT...LOC 2338Z 311DEG 19KT 4074 9648 4032 9712

DEE
Special weather statement, Jul 24, 6:54 PM CDT, 24 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
654 PM CDT FRI JUL 24 2015

IAZ079-090-NEZ053-067-068-250030-
FREMONT IA-MILLS IA-CASS NE-OTOE NE-SARPY NE-
654 PM CDT FRI JUL 24 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN MILLS...NORTHWESTERN
FREMONT...CASS...NORTHWESTERN OTOE AND SOUTHWESTERN SARPY COUNTIES
UNTIL 730 PM CDT...

AT 654 PM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR MURDOCK TO NEAR
PALMYRA...AND MOVING SOUTHEAST AT 15 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
LOUISVILLE...WEEPING WATER...ELMWOOD...MURRAY...AVOCA...UNION...
NEHAWKA...DUNBAR...MANLEY...OTOE...LOUISVILLE STATE RECREATION AREA
AND CAMP CATRON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4092 9579 4058 9596 4078 9642 4101 9619
TIME...MOT...LOC 2354Z 302DEG 13KT 4096 9623 4078 9638

DEE

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 24, 7:03 PM CDTSevere Thunderstorm WarningOAXCass, Sarpy16 min
Jul 24, 7:37 PM CDTSpecial Weather StatementOAXGage, Johnson, Otoe23 min
Jul 24, 7:46 PM CDTSevere Thunderstorm WarningOAXCass29 min
Jul 24, 8:00 PM CDTSpecial Weather StatementOAXGage, Pawnee45 min
Jul 24, 8:02 PM CDTSevere Thunderstorm WarningOAXGage28 min
Jul 24, 8:20 PM CDTSpecial Weather StatementOAXNemaha, Richardson40 min
Jul 24, 8:34 PM CDTSpecial Weather StatementOAXGage41 min
Jul 24, 11:28 PM CDTSevere Thunderstorm WarningOAXButler, Gage, Jefferson, Lancaster, Saline, Saunders and 1 more47 min
Jul 25, 12:06 AM CDTSevere Thunderstorm WarningOAXCass, Lancaster, Otoe39 min
Jul 25, 12:18 AM CDTSevere Thunderstorm WarningOAXButler, Lancaster, Saunders, Seward27 min
Jul 25, 12:49 AM CDTSpecial Weather StatementOAXCass, Lancaster, Otoe, Sarpy, Saunders41 min
Jul 25, 1:25 AM CDTSpecial Weather StatementOAXNemaha, Richardson35 min
Jul 25, 2:07 AM CDTSpecial Weather StatementOAXRichardson23 min
Jul 25, 2:48 PM CDTHeat AdvisoryOAXBurt, Butler, Cass, Dodge, Douglas, Gage and 12 more28 hr
Jul 24, 7:42 PM CDTSpecial Weather StatementOAXMills33 min
Jul 24, 7:49 PM CDTSevere Thunderstorm WarningOAXMills, Montgomery, Pottawattamie26 min
Jul 24, 8:16 PM CDTSpecial Weather StatementOAXFremont, Montgomery, Page44 min
Jul 25, 1:58 AM CDTSpecial Weather StatementOAXMontgomery, Page32 min
Jul 25, 2:05 AM CDTSevere Thunderstorm WarningOAXFremont, Montgomery, Page25 min
Jul 25, 2:31 AM CDTSevere Thunderstorm WarningOAXMontgomery, Page29 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2015Severe Thunderstorm Warnings in Iowa, 2015Every 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.