Alert archive / Nebraska / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 191, NWS Omaha, NE

September 1, 2013Nemaha County, Richardson County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Sep 1, 2013, 5:05 AM CDT for Nemaha County, Richardson County, Nebraska. It was in force for 40 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: Sep 1, 2013, 5:05 AM CDT (10:05 UTC)
Expired: Sep 1, 2013, 5:45 AM CDT
In force: 40 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Nemaha County, NE, Richardson County, NE

The radar

The Omaha radar (KOAX), 128 km from the middle of the area, began a volume at 10:05 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, 10.1 hours before the alert went out and 128 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: 2453 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1726 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 6.1

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 Sep 1, 3:47 AM CDT, 1 hour 18 minutes earlier.

Area forecast discussion, Sep 1, 3:47 AM CDT, 1 hour 18 minutes before

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Hazardous weather outlook, Aug 31, 5:06 PM CDT, 11 hours 59 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
506 PM CDT SAT AUG 31 2013

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-011215-
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-
506 PM CDT SAT AUG 31 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN NEBRASKA
AND SOUTHWEST IOWA.

.DAY ONE...TONIGHT AND SUNDAY

THERE IS A CHANCE OF THUNDERSTORMS IN NORTHEAST NEBRASKA THIS
EVENING WITH THE RISK SHIFTING SOUTHEAST ACROSS THE I80 CORRIDOR
LATE THIS EVENING AND OVERNIGHT. IF STORMS DO MANAGE TO DEVELOP
AND MOVE ACROSS THE REGION...THEY COULD BE SEVERE WITH STRONG
WINDS THE PRIMARY HAZARD. ISOLATED LARGE HAIL WOULD ALSO BE
POSSIBLE.

A STRONG UPPER LEVEL DISTURBANCE TRACKING INTO NORTHEAST NORTH
DAKOTA AND NORTHERN MINNESOTA WILL DRIVE A COLD FRONT ACROSS THE
AREA THIS EVENING. THIS COMBINATION COULD BRING SCATTERED
THUNDERSTORMS TO THE REGION. HOWEVER...WARM MID LEVEL
TEMPERATURES...A MODEST LOW LEVEL JET AND MARGINAL WIND SHEAR
COULD LIMIT THE COVERAGE OR CONCENTRATE IT MORE TOWARD FAR
NORTHEAST NEBRASKA AND WEST CENTRAL IOWA.

A FEW MOSTLY NON-SEVERE THUNDERSTORMS COULD LINGER ACROSS FAR
SOUTHEAST NEBRASKA AND SOUTHWEST IOWA SUNDAY MORNING.

.DAYS TWO THROUGH SEVEN...SUNDAY NIGHT THROUGH SATURDAY

THERE IS A SMALL CHANCE OF THUNDERSTORMS WEDNESDAY NIGHT AS
ANOTHER DISTURBANCE AND FRONT MOVE ACROSS THE AREA. AT THIS TIME
SEVERE WEATHER CHANCES APPEAR LOW.

.SPOTTER INFORMATION STATEMENT...

THERE IS A SMALL CHANCE THAT SPOTTER ACTIVATION MAY BE
NEEDED THIS EVENING...AND THEN GENERALLY NORTH OF COLUMBUS
NEBRASKA TO HARLAN IOWA.

CHERMOK

In the hours before

Special weather statement, Sep 1, 3:01 AM CDT, 2 hours 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
301 AM CDT SUN SEP 1 2013

IAZ055-056-069-079-080-090-NEZ052-053-067-010845-
FREMONT IA-SHELBY IA-POTTAWATTAMIE IA-MILLS IA-HARRISON IA-
MONTGOMERY IA-CASS NE-DOUGLAS NE-SARPY NE-
301 AM CDT SUN SEP 1 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN FREMONT...SHELBY...
POTTAWATTAMIE...MILLS...SOUTHEASTERN HARRISON...MONTGOMERY...EASTERN
CASS...DOUGLAS AND SARPY COUNTIES UNTIL 345 AM CDT...

AT 257 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM ELK HORN TO
SPRINGFIELD...OR ALONG A LINE EXTENDING FROM 55 MILES SOUTH OF IDA
GROVE TO 15 MILES SOUTHWEST OF OMAHA...AND MOVING SOUTHEAST AT 35
MPH.

WIND GUSTS UP TO 45 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
OMAHA...COUNCIL BLUFFS...BELLEVUE...PAPILLION...LA VISTA...OFFUTT
AFB...MILLARD...PLATTSMOUTH...RALSTON...RED OAK...ELKHORN...
GLENWOOD...HARLAN...AVOCA...OAKLAND...SPRINGFIELD...SIDNEY...
MALVERN...TREYNOR AND WALNUT.

LAT...LON 4090 9531 4090 9538 4086 9539 4071 9571
      4123 9634 4139 9609 4139 9594 4145 9592
      4147 9597 4187 9535 4186 9510 4160 9509
      4160 9504 4151 9504 4150 9516 4116 9516
      4116 9493 4109 9493
TIME...MOT...LOC 0757Z 300DEG 31KT 4159 9511 4107 9617

MAYES

Special weather statement, Sep 1, 3:26 AM CDT, 1 hour 39 minutes before

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Local storm report, Sep 1, 3:32 AM CDT, 1 hour 33 minutes before

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Special weather statement, Sep 1, 4:16 AM CDT, 49 minutes before

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Special weather statement, Sep 1, 4:41 AM CDT, 24 minutes before

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Special weather statement, Sep 1, 4:42 AM CDT, 23 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
Sep 1, 12:57 AM CDT	Special Weather Statement	OAX	Thurston	33 min
Sep 1, 1:33 AM CDT	Special Weather Statement	OAX	Burt	27 min
Sep 1, 2:20 AM CDT	Special Weather Statement	OAX	Douglas, Washington	40 min
Sep 1, 2:23 AM CDT	Special Weather Statement	OAX	Cass	52 min
Sep 1, 2:52 AM CDT	Special Weather Statement	OAX	Burt	38 min
Sep 1, 3:01 AM CDT	Special Weather Statement	OAX	Douglas, Sarpy	44 min
Sep 1, 3:23 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Sarpy	37 min
Sep 1, 4:16 AM CDT	Special Weather Statement	OAX	Gage, Johnson, Pawnee	29 min
Sep 1, 4:41 AM CDT	Special Weather Statement	OAX	Nemaha	34 min
Sep 1, 4:46 AM CDT	Severe Thunderstorm Warning	OAX	Nemaha, Richardson	29 min
Sep 1, 3:26 AM CDT	Special Weather Statement	OAX	Harrison, Shelby	34 min
Sep 1, 4:42 AM CDT	Special Weather Statement	OAX	Page	33 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2013 Every severe thunderstorm warning in 2013

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.