Alert archive / Nebraska / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 244, NWS Omaha, NE

August 10, 2007Antelope County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Aug 10, 2007, 1:16 AM CDT for Antelope County, Nebraska. It was in force for 44 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, 2007, 1:16 AM CDT (06:16 UTC)
Expired: Aug 10, 2007, 2:00 AM CDT
In force: 44 min
Issued by: NWS Omaha, NE
Area: Counties, with a storm outline in the text

County Antelope County, NE

The radar

The Omaha radar (KOAX), 170 km from the middle of the area, began a volume at 06:17 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 9, 10:14 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 6.3 hours before the alert went out and 170 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: 3891 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1233 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 236 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 13.9

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 9, 3:02 PM CDT, 10 hours 14 minutes earlier.

Area forecast discussion, Aug 9, 3:02 PM CDT, 10 hours 14 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
302 PM CDT THU AUG 9 2007

.SHORT TERM...TONIGHT AND FRIDAY. STLT AND MORNING UA ANLYS SHOWED
UPPER RIDGE RETROGRADING WNWD ACROSS THE SRN PLAINS. AFTN WATER
VAPOR IMAGERY SHOWED A POSSIBLE WEAK WAVE LIFTING ACROSS EXTREME
ERN WY. AT 19Z A DVLPG WARM FRONT WAS ESTIMATED NEAR AN ONL-OFK-
OMA LINE WITH DVLPG CU NW OF OFK AND ST DECK LIFTING/MIXING OUT N
OF BOUNDARY OVER FAR ECNTRL/NERN NEBR/SW IA. AS OF 20Z CONVECTION
WAS POSSIBLY TRYING TO DVLP OVR NRN NEBR PNDL. HOWEVER...00Z SREF
AND ESPECIALLY 4K WRF QPF PLACEMENT INDICATED DEVELOPMENT WILL
OCCUR NEAR WHERE CU FIELD WAS DVLPG NCNTRL NEBR. LOW LVL JET COULD
AID ANY CONVECTION THAT DVLPS TO HOLD TOGETHER FARTHER E ACROSS
NRN ZONES TNGT...BUT BUILDING HGTS AND FRONTAL BOUNDARY BECOMING
MORE ESTABLISHED N OF THE CWA SHOULD LIMIT COVERAGE/CHCS/SEWD
DVLPMENT TNGT. WL KEEP MENTION TNGT TO SLGT CHC AND THEN N OF
OMAHA AND PER PREV FCST LEFT IN SLGT CHC FAR NERN ZONES FRI AM.
MAY ADJUST POPS UP A BIT TNGT AT LAST MINUTE FAR NW ZONES IF
DVLPMENT SHOWS ITS HAND BEFORE ISSUANCE TIME. WITH MOISTURE
POOLING ALONG MO RIVER...DWPTS IN THE MID/UPPER 70S...AND LIGHT
WINDS AGAIN TNGT WL MENTION AREAS OF FOG E. WITH 850 MB TEMPS
FORECAST TO BE A DEG OR TWO WARMER TOMORROW COMPARED TO 00Z THIS
EVENING...AND LIKELIHOOD OF MIXING THAT DEEP...MADE LTL CHANGES TO
HIGHS...MAYBE BUMPED THEM UP A DEG OR SO. APPEARS AREA WON/T
COMPLETELY MIX OUT THOUGH YET SO DWPTS WILL REMAIN HIGH AND AFTN
HEAT INDICES WILL LIKELY TOUCH OR EXCEED 105 DEGREES. SINCE LOW
TEMPERATURES SHOULD DROP TO 70/LOWER 70S TNGT WITH LIGHT
WINDS...HELD OFF ON HEAT ADVISORY ALTHOUGH SOME SORT OF HEAT
HEADLINE WILL PROBABLY BE NEEDED BY THE WEEKEND.

.LONG TERM...FRIDAY NIGHT THROUGH THURSDAY. BUILDING UPPER HEIGHTS
AND HOT TEMPERATURES MAIN STORY HERE. SEVERAL BOUNDARIES WILL MAKE
A RUN AT THE NRN CWA...SUNDAY AND WEDNESDAY. WITH 500 MB HGTS
FORECAST TO BE AT LEAST 594 DM OVR CWA SUNDAY AND 591 BY WED...FEEL
FRONT WILL HAVE ONLY A VERY SMALL CHANCE OF BRINGING PCPN OR MUCH
RELIEF FROM THE HEAT. BY LATE IN THE WEEK QUESTION WILL BE WHETHER
RIDGE WILL KEEP BUILDING WWD ALLOWING A MORE NWRLY FLOW OVR THE
CWA AND POSSIBLE RELIEF...OR REMAIN IN PLACE OR SHIFT SLIGHTLY
EWD. THE LATTER WAS SUGGESTED BY LATEST ECMWF AND 00Z GFS ENSEMBLE
MEAN. SO HIGHS IN LATEST MEX GUIDANCE BY NEXT WED/THU COULD
PARTIALLY BE INFLUENCED BY CLIMO...ALTHO GFS DID SHOW A MID/LATE
WEEK FRONT PUSHING A FARTHER S...WHICH IS NOT BOUGHT HERE YET.
LEFT FORECAST DRY EXCEPT FOR A SLIGHT CHC NRN ZONES WITH WEAK
BOUNDARY SAT NGT. KEPT MOST HIGHS IN 95-101 RANGE THRU MUCH OF THE
PD...POSSIBLY A FEW DEGREES COOLER NRN/NERN ZONES A FEW DAYS
REFLECTING EITHER MODIFIED WIND FLOW OFF RETREATING HIGHS OVR NRN
PLAINS OR RESIDUAL CONVECTIVE DEBRIS FM NRN PLAINS MCSS.

&&

.AVIATION...

HAVE ADDED PROB GROUP TO OFK TAF 06Z-10Z PD FOR POSSIBLE PCPN
ACTIVITY DEVELOPING. HAVE OPTED TO JUST GO WITH CB REMARK AS OPPOSED
TO TS DUE TO AREAL COVERAG UNCERTAINTIES. ALSO...LLVL MOISTURE IN
PLACE MAY ALLOW FOR MVFR...WITH POSSIBLE IFR CONDITIONS...AT OFK &
OMA BTW 10Z-14Z. OTHERWISE...VFR COND TO PREVAIL ALL SITES.

&&

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

CHERMOK/DEE

Hazardous weather outlook, Aug 10, 12:10 AM CDT, 1 hour 6 minutes before

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In the hours before

Local storm report, Aug 9, 10:38 PM CDT, 2 hours 38 minutes before

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Local storm report, Aug 9, 10:56 PM CDT, 2 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1056 PM CDT THU AUG 09 2007

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

1021 PM     TSTM WND GST     NORFOLK                 42.03N 97.42W
08/09/2007  E60 MPH          MADISON            NE   BROADCAST MEDIA

            TREES DOWN

1021 PM     TSTM WND GST     NORFOLK                 42.03N 97.42W
08/09/2007  E70 MPH          MADISON            NE   BROADCAST MEDIA

            TREES DOWN

&&

SK

Local storm report, Aug 9, 10:57 PM CDT, 2 hours 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1057 PM CDT THU AUG 09 2007

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

1045 PM     HAIL             TARNOV                  41.61N 97.50W
08/09/2007  E1.00 INCH       PLATTE             NE   LAW ENFORCEMENT

&&

SK

Local storm report, Aug 9, 11:46 PM CDT, 1 hour 30 minutes before

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Local storm report, Aug 9, 11:51 PM CDT, 1 hour 25 minutes before

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Local storm report, Aug 10, 12:05 AM CDT, 1 hour 11 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 9, 8:23 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Knox	52 min
Aug 9, 9:15 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Boone	30 min
Aug 9, 9:37 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Pierce	23 min
Aug 9, 9:44 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Boone	31 min
Aug 9, 9:51 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox	39 min
Aug 9, 10:00 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Pierce	30 min
Aug 9, 10:08 PM CDT	Severe Thunderstorm Warning	OAX	Platte	52 min
Aug 9, 10:29 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Stanton	46 min
Aug 9, 10:37 PM CDT	Severe Thunderstorm Warning	OAX	Wayne	23 min
Aug 9, 10:48 PM CDT	Severe Thunderstorm Warning	OAX	Cuming, Thurston	42 min
Aug 9, 10:52 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Platte	38 min
Aug 9, 11:22 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Dodge, Saunders	38 min
Aug 9, 11:31 PM CDT	Severe Thunderstorm Warning	OAX	Burt	44 min
Aug 10, 1:53 AM CDT	Severe Thunderstorm Warning	OAX	Antelope	37 min
Aug 10, 2:02 AM CDT	Severe Thunderstorm Warning	OAX	Otoe	25 min
Aug 10, 2:28 AM CDT	Severe Thunderstorm Warning	OAX	Antelope	32 min
Aug 10, 4:16 AM CDT	Heat Advisory	OAX	Butler, Cass, Douglas, Gage, Jefferson, Johnson and 9 more	63 hr
Aug 10, 12:22 PM CDT	Severe Thunderstorm Warning	OAX	Knox	38 min
Aug 10, 12:50 PM CDT	Severe Thunderstorm Warning	OAX	Knox	55 min
Aug 10, 12:57 PM CDT	Tornado Warning	OAX	Knox	33 min
Aug 10, 1:17 PM CDT	Tornado Warning	OAX	Pierce	58 min
Aug 10, 2:05 PM CDT	Severe Thunderstorm Warning	OAX	Wayne	55 min
Aug 10, 2:59 PM CDT	Severe Thunderstorm Warning	OAX	Thurston	46 min
Aug 9, 11:24 PM CDT	Severe Thunderstorm Warning	OAX	Monona	51 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2007 Every severe thunderstorm warning in 2007

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.