Alert archive / Nebraska / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 182, NWS Omaha, NE

August 10, 2013Knox County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Aug 10, 2013, 4:53 PM CDT for Knox County, Nebraska. It was in force for 37 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: Aug 10, 2013, 4:53 PM CDT (21:53 UTC)
Expired: Aug 10, 2013, 5:30 PM CDT
In force: 37 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Knox County, NE

The radar

The Sioux Falls radar (KFSD), 142 km from the middle of the area, began a volume at 21:53 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

Aberdeen, SD (KABR), launched 12:00Z, 9.9 hours before the alert went out and 255 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1009 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 44 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 Aug 10, 3:20 PM CDT, 1 hour 33 minutes earlier.

Area forecast discussion, Aug 10, 3:20 PM CDT, 1 hour 33 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
320 PM CDT SAT AUG 10 2013

.DISCUSSION...

TEMPERATURES THROUGH THE PERIOD AND PCPN CHANCES...ESPECIALLY FOR
SUNDAY THROUGH MONDAY...ARE THE MAIN FORECAST CONCERNS.

LARGE SCALE PATTERN FEATURES A RIDGE OVER THE SOUTHERN CONUS AND
WEAK REX BLOCK OVER WESTERN NORTH AMERICA. A RIDGE WILL STRENGTHEN
OVER THE EASTERN ROCKIES THROUGH TUESDAY AS A TROUGH DIGS OVER
EASTERN CANADA AND THE GREAT LAKES REGION. OUR AREA GENERALLY
REMAINS IN NORTHWEST FLOW...WITH BEST PCPN CHANCES ACROSS OUR
WESTERN ZONES.

TONIGHT...BEST PARAMETERS FOR TSTMS WILL BE OVER SERN SD/SWRN MN BUT
DID KEEP SOME LOW POPS IN OUR NORTHERN ZONES GENERALLY ALONG AND
NORTH OF A WARM FRONT/STATIONARY FRONT. BEST CHANCES WOULD BE
PRIOR TO MIDNIGHT. SOUTHERLY WINDS SHOULD HELP KEEP LOWS A LITTLE
WARMER THAN THOSE FROM FRIDAY NIGHT.

SUNDAY...A WEAK COLD FRONT WILL SAG DOWN INTO THE AREA AS LOW
PRESSURE TRACKS SOUTHEAST TOWARD CENTRAL IOWA BY SUNDAY EVENING. ML
CAPE VALUES REACH 2000-3000 J/KG OVER NORTHEAST NEBRASKA BUT 0-6 KM
SHEAR VALUES ONLY REACH 20-30 KNOTS. SOME ISOLATED SEVERE STORMS
SEEM POSSIBLE IN THE AFTERNOON AND EARLY EVENING.

KEPT POPS MOSTLY 20-40 PERCENT FROM SUNDAY AFTERNOON THROUGH MONDAY
ALTHOUGH NORTHERN ZONES SHOULD BE DRYING OUT MONDAY AFTERNOON. HIGHS
ARE EXPECTED TO BE IN THE LOWER TO MID 80S NORTH AND MID TO UPPER
80S SOUTH.

HIGH PRESSURE AT THE SURFACE OVER THE WESTERN GREAT LAKES REGION
FROM TUESDAY INTO WEDNESDAY WILL PROVIDE RELATIVELY DRY EASTERLY LOW
LEVEL FLOW AND THIS MAY KEEP THE MAJORITY OF PCPN TO OUR WEST OR
SOUTH. BUT...KEPT SOME POPS IN OUR WESTERN AND SOUTHERN ZONES TO
REMAIN IN COLLABORATION WITH OUR NEIGHBORING OFFICES. HIGHS ON
WEDNESDAY SHOULD ONLY BE IN THE MID TO UPPER 70S...THEN TEMPERATURES
SHOULD MODERATE SLIGHTLY THURSDAY THROUGH SATURDAY.

MILLER

&&

.AVIATION...

18Z TAFS FOR KOMA...KLNK...KOFK.

POTENTIAL FOR WIDELY SCATTERED SHOWERS AND THUNDERSTORMS EXPECTED
TO CONTINUE FOR AREAS NEAR THE NEBRASKA SOUTH DAKOTA BORDER
THROUGH MUCH OF THE PERIOD AS UPPER WAVE MOVES THROUGH THE REGION.
KOFK WOULD APPEAR TO HAVE A SLIGHT CHANCE FOR AN ISOLATED STORM
LATE TONIGHT BUT NO MENTION IN FORECAST AT THIS TIME. VFR CONDITIONS
LIKELY THROUGH THE PERIOD OUTSIDE ANY THUNDERSTORMS AT ALL
THREE SITES.

FOBERT

&&

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

Hazardous weather outlook, Aug 10, 4:30 PM CDT, 23 minutes before

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In the hours before

Special weather statement, Aug 10, 3:18 PM CDT, 1 hour 35 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
318 PM CDT SAT AUG 10 2013

NEZ011-102045-
KNOX NE-
318 PM CDT SAT AUG 10 2013

...SPECIAL WEATHER STATEMENT...

AT 314 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR VERDIGRE...OR 35 MILES SOUTHWEST OF
YANKTON...MOVING NORTHEAST AT 15 MPH.

HAIL UP TO THE SIZE OF PEAS WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
VERDIGRE...SANTEE...CENTER AND WINNETOON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

IF ON OR NEAR THE MISSOURI RIVER...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 4285 9776 4269 9755 4251 9796 4254 9801
      4264 9813 4277 9798 4277 9795 4282 9788
      4286 9788 4287 9786
TIME...MOT...LOC 2014Z 228DEG 15KT 4263 9798

KERN

Special weather statement, Aug 10, 3:49 PM CDT, 1 hour 4 minutes before

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Special weather statement, Aug 10, 4:12 PM CDT, 41 minutes before

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Special weather statement, Aug 10, 4:25 PM CDT, 28 minutes before

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Special weather statement, Aug 10, 4:38 PM CDT, 15 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
Aug 10, 3:18 PM CDT	Special Weather Statement	OAX	Knox	27 min
Aug 10, 3:49 PM CDT	Special Weather Statement	OAX	Knox	26 min
Aug 10, 4:12 PM CDT	Special Weather Statement	OAX	Knox	48 min
Aug 10, 4:25 PM CDT	Special Weather Statement	OAX	Cedar	35 min
Aug 10, 4:38 PM CDT	Special Weather Statement	OAX	Cedar	37 min
Aug 10, 5:14 PM CDT	Areal Flood Advisory	OAX	Knox	3 hr
Aug 10, 5:27 PM CDT	Special Weather Statement	OAX	Knox	33 min
Aug 10, 5:31 PM CDT	Special Weather Statement	OAX	Knox	44 min
Aug 10, 6:21 PM CDT	Special Weather Statement	OAX	Cedar	39 min
Aug 10, 6:46 PM CDT	Special Weather Statement	OAX	Cedar	44 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.