Alert archive / Nebraska / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 107, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at May 29, 2011, 11:12 PM CDT for Knox County, Nebraska. It was in force for 48 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
- May 29, 2011, 11:12 PM CDT (04:12 UTC)
- Expired
- May 30, 2011, 12:00 AM CDT
- In force
- 48 min
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Knox County, NE
The radar
The Sioux Falls radar (KFSD), 142 km from the middle of the area, began a volume at 04:15 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, 4.2 hours before the alert went out and 193 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.
- Mixed-layer CAPE
- 3559 J/kg
- Mixed-layer CIN
- -87 J/kg
- Mixed-layer LCL
- 597 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 440 m²/s²
- 0-3 km storm-relative helicity
- 720 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 59.8
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 May 29, 3:25 PM CDT, 7 hours 47 minutes earlier.
Area forecast discussion, May 29, 3:25 PM CDT, 7 hours 47 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
325 PM CDT SUN MAY 29 2011
.SHORT TERM...TONIGHT THROUGH WEDNESDAY.
FOR TONIGHT WILL MAINTAIN HIGH CHC POPS NORTH ASSOCIATED WITH
WARM FRONT LIFTING INTO THE DAKOTAS/NRN IA. HOWEVER...APPEARS THAT
THERE IS AT LEAST A SLGT CHANCE FOR ISOLATED CONVECTION INITIATING
THIS EVENING WITHIN A NARROW GAP OF WEAK CAPPING EXTENDING FROM ABOUT
WEST-CENTRAL IA TO NORTH-CENTRAL KS. NEAR TERM HIRES PROGS...HRRR/4KM
WRF/ARW4/NMM4...ALL IN GOOD AGREEMENT WITH THIS. ON MONDAY
DISTINCT POSSIBILITY FOR SIGNIFICANT SEVERE WEATHER...TORNADIC
STORMS...LATE AFTN/EARLY EVENING OVER NORTHEAST NEB ASSOCIATED WITH
STRONG COLD FRONT SWEEPING EWD ACROSS THE CNTRL PLAINS/DAKOTAS/UPPER
MIDWEST. IMPRESSIVE COMPOSITE PARAMETERS ADVERTISED PROMPTING SPC
TO GO WITH A MODERATE RISK IN DAY 2. DEEP SHEAR 40-60KT...0-1KM SRH
200 M2/S2...MUCAPES 2500-3000 J/KG. COLD FRONT SHOULD BE CLEAR OF
THE CWA BY MORNING RUSH TUESDAY. ANOTHER WARM FRONT LIFTS THRU CNTRL
PLAINS ON WED...AND THINK THERE IS AT LEAST A SMALL CHANCE FOR
CONVECTION ON WEAKER EDGE OF CAP.
.LONG TERM...WEDNESDAY NIGHT THROUGH SATURDAY.
GOING EXTENDED PD FCST IN PRETTY GOOD SHAPE...SO ONLY MINOR
ADJUSTMENTS MADE. WARM FRONT ASSOCIATED WITH AREA OF SFC LOW PRESSURE
OVER MT WILL LIFT THRU THE CNTRL PLAINS AND IS PROGGED TO BE CLEAR OF
THE NRN CWA EARLY THURSDAY MORNING AND GOING FCST HAS SLGT POPS
NORTH. AT THIS POINT COULD EASILY REMOVE THEM...BUT CANNOT TOTALLY
DISCOUNT ISOLATED STORMS POPPING UP ALONG 850MB FRONT. SO FOR SAKE OF
ADVANCING POTENTIAL FLIP-FLOP WILL LEAVE TOKEN 20S IN. OTHERWISE
INTERESTING SFC PATTERN ON TAP BEGINNING LATE THURSDAY NIGHT. BOTH
GFS/ECM DEPICT A COLD FRONT DROPPING THRU THE NRN PLAINS...BUT THEN
STALLS OUT WHEN SOUTHERLY RETURN FLOW ASSOCIATED WITH SFC HIGH OVER
THE SERN STATES...INCREASES OVER THE CNTRL PLAINS AND BRINGS THE
ADVANCING BNDRY TO A HALT ON FRIDAY. GFS AND ECM THEN DIFFER ON BNDRY
POSITIONING. GFS SHOWS FRONT LIFTING SLIGHTLY TO THE NORTH WHILE THE
ECM STALLS IT OUT ALONG THE NEB/KS...IA/MO BORDER. THEREFORE HAVE
DECIDED TO KEEP REST OF EXTENDED PDS DRY CONSIDERING HIGH MLCINH/NO
SIGNIFICANT SHORTWAVE TROF PASSING THRU TO WEAKEN CAP/UNCERTAINTY
HOW SFC BNDRY WILL MEANDER OVER THE CNTRL PLAINS.
DEE
&&
.AVIATION...
TAF SITES KOFK/KOMA/KLNK
18Z TAFS
SURFACE WARM FRONT CONTINUED TO PRESS NORTH AND AT 29/19Z WAS JUST
SOUTH OF A LNK-PMV LINE. CIGS SOUTH OF FRONT HAVE IMPROVED TO HIGH
END OF MVFR OR JUST ABOVE WHILE FARTHER NW CIGS HAD DROPPED INTO IFR
OR LIFR CATEGORY ALONG WITH VISIBILITY RESTRICTIONS IN FOG. WITH
LOW LVL JET INCREASING TONIGHT EXPECT FRONT TO CONTINUE LIFTING NWD
AND MIXING FORECAST SOUTH OF FRONT SHOULD KEEP ANY FOG FROM
REFORMING AND ANY CIGS LIKELY ABOVE MVFR RANGE. HOWEVER...THIS
IMPROVEMENT MAY NOT REACH KOFK UNTIL MONDAY MORNING. VERY STRONG
SOUTH WINDS WILL DEVELOP MEMORIAL DAY WITH THUNDERSTORMS LIKELY BY
MONDAY EVENING. THUNDERSTORMS THIS EVENING WERE FORECAST TO REMAIN
SW OR NE OF TAF SITES.
CHERMOK
&&
.OAX WATCHES/WARNINGS/ADVISORIES...
NE...WIND ADVISORY FROM 10 AM TO 7 PM CDT MONDAY FOR NEZ011-012-
015>018-030>034-042>045-050>053-065>068-078-088>093.
IA...WIND ADVISORY FROM 10 AM TO 7 PM CDT MONDAY FOR IAZ043-055-056-
069-079-080-090-091.
&&Hazardous weather outlook, May 29, 5:23 PM CDT, 5 hours 49 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 523 PM CDT SUN MAY 29 2011 NEZ016>018-030>033-042>044-301100- ANTELOPE-BOONE-COLFAX-CUMING-DODGE-MADISON-PIERCE-PLATTE-STANTON- WAYNE- 523 PM CDT SUN MAY 29 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST NEBRASKA .DAY ONE...TONIGHT AND MONDAY THERE IS A CHANCE FOR THUNDERSTORMS OVER THE OUTLOOK THIS EVENING... PARTICULARLY FOR AREAS NORTH OF I-80. ON MONDAY...THERE IS A GOOD CHANCE FOR LATE AFTERNOON SEVERE THUNDERSTORMS DEVELOPING OVER PORTIONS OF NORTHEAST NEBRASKA... SPECIFICALLY ALONG AND WEST OF A LINE FROM ABOUT WAYNE TO COLUMBUS. TORNADIC STORMS ARE THE PRIMARY THREAT...ALONG WITH LARGE HAIL AND DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...MONDAY NIGHT THROUGH SUNDAY THUNDERSTORMS ARE LIKELY OVER THE OUTLOOK AREA MONDAY NIGHT ALONG A COLD FRONT SWEEPING ACROSS THE CENTRAL PLAINS. SEVERE WEATHER IS POSSIBLE ANYWHERE ALONG THE FRONT MONDAY EVENING. TORNADIC THUNDERSTORMS WILL BE ESPECIALLY POSSIBLE OVER NORTHEAST NEBRASKA. THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS OVER THE AREA ON WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE REQUIRED OVER NORTHEAST NEBRASKA MONDAY AFTERNOON AND EVENING. IAZ043-055-056-069-079-080-090-091-NEZ015-034-045-052-053-067-068- 091-093-301100- BURT-CASS-DOUGLAS-FREMONT IA-HARRISON IA-MILLS IA-MONONA IA- MONTGOMERY IA-NEMAHA-OTOE-PAGE IA-POTTAWATTAMIE IA-RICHARDSON-SARPY- SHELBY IA-THURSTON-WASHINGTON- 523 PM CDT SUN MAY 29 2011 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 THERE IS A SMALL CHANCE OF THUNDERSTORMS THIS EVENING. FLOODING WILL CONTINUE ALONG MOST OF THE MISSOURI RIVER THROUGH TONIGHT. FLOODING WILL BE MOST PRONOUNCED AROUND AND DOWNSTREAM OF PLATTSMOUTH. .DAYS TWO THROUGH SEVEN...MONDAY NIGHT THROUGH SUNDAY THUNDERSTORMS ARE LIKELY OVER THE OUTLOOK AREA MONDAY NIGHT ALONG A COLD FRONT SWEEPING ACROSS THE CENTRAL PLAINS. SEVERE WEATHER IS POSSIBLE ANYWHERE ALONG THE FRONT MONDAY EVENING WITH LARGE AND DAMAGING WINDS POSSIBLE. THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS OVER THE AREA ON WEDNESDAY. FLOODING WILL PERSIST ALONG MOST OF THE MISSOURI RIVER NEXT WEEK. .SPOTTER INFORMATION STATEMENT... THERE IS A CHANCE SPOTTER ACTIVATION WILL BE NEEDED MONDAY EVENING. NEZ050-051-065-066-078-088>090-092-301100- BUTLER-GAGE-JEFFERSON-JOHNSON-LANCASTER-PAWNEE-SALINE-SAUNDERS- SEWARD- 523 PM CDT SUN MAY 29 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST NEBRASKA .DAY ONE...TONIGHT AND MONDAY THERE IS A CHANCE FOR THUNDERSTORMS OVER THE OUTLOOK THIS EVENING. ON MONDAY AFTERNOON...THERE IS A CHANCE FOR SEVEVE STORMS MAINLY WEST OF A LINE FROM WAHOO TO BEATRICE. THE PRIMARY THREAT BEING LARGE HAIL AND DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...MONDAY NIGHT THROUGH SUNDAY THUNDERSTORMS ARE LIKELY OVER THE OUTLOOK AREA MONDAY NIGHT ALONG A COLD FRONT SWEEPING ACROSS THE CENTRAL PLAINS. SEVERE WEATHER IS POSSIBLE ANYWHERE ALONG THE FRONT MONDAY EVENING WITH LARGE AND DAMAGING WINDS POSSIBLE. THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS OVER THE AREA ON WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WMAY BE NEEDED OVER SOUTHEAST NEBRASKA MONDAY AFTERNOON AND EVENING. NEZ011-012-301100- CEDAR-KNOX- 523 PM CDT SUN MAY 29 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST NEBRASKA. .DAY ONE...TONIGHT AND MONDAY THERE IS A CHANCE FOR THUNDERSTORMS OVER THE OUTLOOK THIS EVENING... PARTICULARLY FOR AREAS NORTH OF I-80. ON MONDAY...THERE IS A GOOD CHANCE FOR LATE AFTERNOON SEVERE THUNDERSTORMS DEVELOPING OVER PORTIONS OF NORTHEAST NEBRASKA... SPECIFICALLY ALONG AND WEST OF A LINE FROM ABOUT WAYNE TO COLUMBUS. TORNADIC STORMS ARE THE PRIMARY THREAT...ALONG WITH LARGE HAIL AND DAMAGING WINDS. FLOODING WILL CONTINUE ALONG MOST OF THE MISSOURI RIVER...AND BE MOST PRONOUNCED IN NORTHERN KNOX AND CEDAR COUNTIES. .DAYS TWO THROUGH SEVEN...MONDAY NIGHT THROUGH SUNDAY THUNDERSTORMS ARE LIKELY OVER THE OUTLOOK AREA MONDAY NIGHT ALONG A COLD FRONT SWEEPING ACROSS THE CENTRAL PLAINS. SEVERE WEATHER IS POSSIBLE ANYWHERE ALONG THE FRONT MONDAY EVENING. TORNADIC THUNDERSTORMS WILL BE ESPECIALLY POSSIBLE OVER NORTHEAST NEBRASKA. THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS OVER THE AREA ON WEDNESDAY. FLOODING WILL PERSIST ALONG MOST OF THE MISSOURI RIVER NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE REQUIRED OVER NORTHEAST NEBRASKA MONDAY AFTERNOON AND EVENING.
In the hours before
Special weather statement, May 29, 9:47 PM CDT, 1 hour 25 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA 947 PM CDT SUN MAY 29 2011 NEZ017-031-300330- MADISON NE-PIERCE NE- 947 PM CDT SUN MAY 29 2011 ...SPECIAL WEATHER STATEMENT FOR PIERCE AND NORTHWESTERN MADISON COUNTIES UNTIL 1030 PM CDT... AT 947 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING A STRONG THUNDERSTORM NEAR MEADOW GROVE...OR 16 MILES WEST OF NORFOLK...MOVING NORTHEAST AT 45 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... PIERCE... OSMOND... WILLOW CREEK STATE RECREATION AREA... FOSTER... DEWALD
Special weather statement, May 29, 9:48 PM CDT, 1 hour 24 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA 948 PM CDT SUN MAY 29 2011 NEZ016-300330- ANTELOPE NE- 948 PM CDT SUN MAY 29 2011 ...SPECIAL WEATHER STATEMENT FOR ANTELOPE COUNTY UNTIL 1030 PM CDT... AT 947 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING A STRONG THUNDERSTORM 7 MILES NORTHWEST OF ELGIN...OR 40 MILES WEST OF NORFOLK...MOVING NORTH AT 45 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... NELIGH... CLEARWATER... ORCHARD... ROYAL... BRUNSWICK... ASHFALL FOSSIL BEDS STATE HISTORICAL PARK... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. DEWALD
Special weather statement, May 29, 9:52 PM CDT, 1 hour 20 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA 952 PM CDT SUN MAY 29 2011 NEZ066-088-089-300330- GAGE NE-JEFFERSON NE-LANCASTER NE- 952 PM CDT SUN MAY 29 2011 ...SPECIAL WEATHER STATEMENT FOR SOUTHEASTERN LANCASTER... NORTHEASTERN JEFFERSON AND NORTHWESTERN GAGE COUNTIES UNTIL 1030 PM CDT... AT 951 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING A STRONG THUNDERSTORM 6 MILES SOUTH OF PLYMOUTH...OR 14 MILES WEST OF BEATRICE...MOVING NORTHEAST AT 45 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... BEATRICE... LINCOLN... PLYMOUTH... PICKRELL... CLATONIA... HALLAM... CORTLAND... FIRTH... HICKMAN... PANAMA... STAGECOACH STATE RECREATION AREA... WAGON TRAIN STATE RECREATION AREA... SPRAGUE... ROCA... THIS STORM MAY INTENSIFY....AND A TORNADO WATCH IS IN EFFECT FOR THIS AREA. 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. DEWALD
Local storm report, May 29, 10:17 PM CDT, 55 minutes before
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</html>Local storm report, May 29, 10:28 PM CDT, 44 minutes before
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</html>The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 9:29 PM CDT | Severe Thunderstorm Warning | OAX | Jefferson | 31 min |
| May 29, 9:54 PM CDT | Severe Thunderstorm Warning | OAX | Pierce | 36 min |
| May 29, 9:56 PM CDT | Severe Thunderstorm Warning | OAX | Antelope | 34 min |
| May 29, 10:21 PM CDT | Severe Thunderstorm Warning | OAX | Knox | 54 min |
| May 29, 10:27 PM CDT | Severe Thunderstorm Warning | OAX | Cedar, Knox, Pierce | 46 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 2011Every severe thunderstorm warning in 2011
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.