Alert archive / Nebraska / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 80, NWS Omaha, NE

May 5, 2007Boone County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at May 5, 2007, 2:32 PM CDT for Boone County, Nebraska. It was in force for 28 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 5, 2007, 2:32 PM CDT (19:32 UTC)
Expired: May 5, 2007, 3:00 PM CDT
In force: 28 min
Issued by: NWS Omaha, NE
Area: Counties, with a storm outline in the text

County Boone County, NE

The radar

The Omaha radar (KOAX), 148 km from the middle of the area, began a volume at 19:33 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
May 5, 9:51 AM CDT	Tornado Watch PDS	SPC	12 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.5 hours before the alert went out and 221 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: 175 J/kg
Mixed-layer CIN: -216 J/kg
Mixed-layer LCL: 820 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

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 May 5, 2:49 AM CDT, 11 hours 43 minutes earlier.

Area forecast discussion, May 5, 2:49 AM CDT, 11 hours 43 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
249 AM CDT SAT MAY 5 2007

.DISCUSSION...
SEVERE WEATHER AND HEAVY RAIN POTENTIAL OVER THE NEXT COUPLE OF DAYS
ARE THE PRIMARY FORECAST CONCERNS.

STRONG THUNDERSTORMS OVER KANSAS AND SOUTH CENTRAL NEBRASKA HAVE HAD
A HARD TIME SPREADING EAST INTO EASTERN NEBRASKA WITH CONVECTIVE
INHIBITION TOUGH TO BREAK. SOME STORMS HAD FINALLY FIRED IN
NORTHEAST KANSAS AND TRACKED ACROSS THE BORDER INTO SOUTHEAST
NEBRASKA...AND PERSISTENT SUPERCELL STORM WAS APPROACHING WESTERN
CWA AS OF 230 AM. EXPECT THIS HIT AND MISS ACTIVITY TO PERSIST PAST
SUNRISE...BUT SHOULD DECREASE IN INTENSITY WITH DIURNAL COUPLING OF
LOW LEVEL JET.

FOCUS WILL THEN TURN WEST AGAIN THIS AFTERNOON AND TONIGHT. STRONG
JET SEGMENTS CONTINUE TO EJECT NORTHEAST FROM BASE OF UPPER TROUGH
NOW APPROACHING THE FOUR CORNERS REGION...PROVIDING DYNAMIC SUPPORT
FOR CONVECTION ACROSS THE PLAINS. SURFACE TROUGH THAT WAS ROLLING
EAST LAST EVENING HAD STALLED OVER CENTRAL NEBRASKA AFTER
MIDNIGHT...AND WILL BRIDGE FARTHER WEST THIS AFTERNOON AS SURFACE
LOW FORMS OVER SOUTHWEST SOUTH DAKOTA. A WARM FRONT IS ALSO FORECAST
TO EXTEND FROM THAT LOW SOUTHEAST THROUGH EASTERN NEBRASKA DURING
MAX HEATING...BUT THIS MORNINGS CONVECTION MAY DISRUPT THAT SCENARIO
A BIT. STILL EXPECT STORMS TO FIRE ALONG TROUGH OUT WEST DURING THE
AFTERNOON...AND ALSO ALONG WARM FRONT BY LATE AFTERNOON AND EVENING.
SURGE OF HIGH THETA-E AIR IN WARM SECTOR WILL IMPINGE ON WARM FRONT
OVER EASTERN NEBRASKA...AND MODELS SUGGEST CAPES OVER 3000 J/KG
SURGING INTO SOUTHEAST NEBRASKA BY 00Z...WITH BULK SHEAR OVER 50KTS.
EXPECT SUPERCELL STORMS TO FIRE IN WARM SECTOR OF NORTHEAST KANSAS
OR SOUTHEAST NEBRASKA AND ROLL NORTHEAST OVER WARM FRONT WHERE LOW
LEVEL HELICITY WILL BE MAXIMIZED...SUGGESTING SOME TORNADIC THREAT
DURING THE EVENING.

THE THREAT FOR CONVECTION WILL CONTINUE PAST MIDNIGHT...THEN ANOTHER
ROUND SHOULD FIRE SUNDAY AS SURFACE BOUNDARY SLOWLY DRIFTS TOWARD
THE AREA. SEVER PARAMETERS SHOULD NOT CHANGE MUCH SUNDAY
AFTERNOON...JUST THE EXACT LOCATION OF BOUNDARIES AND QUALITY OF
ATMOSPHERE THAT CAN BE ACHIEVED DURING MAX HEATING WILL HAVE TO BE
WORKED OUT. EXPECT SEVERE POTENTIAL WILL BE GREATEST OVER SOUTHEAST
NEBRASKA. HEAVY RAIN WILL ALSO BE A CONCERN WHEN SURFACE TROUGH
FINALLY MAKES A PUSH INTO EASTERN NEBRASKA SUNDAY NIGHT. JUICY AIR
WILL STILL BE IN PLACE AND TRAINING OF ECHOES LIKELY. WILL HAVE TO
MONITOR FOR POTENTIAL FLOODING AT THIS TIME.

NAM AND GFS BOTH CONTINUE TO SHOW THUNDERSTORMS MOVING EAST OF THE
CWA MONDAY MORNING...WITH A BREAK IN THE ACTION THROUGH TUESDAY.
HAVE TRIMMED POPS A BIT GIVEN SOME CONSISTENCY OVER SEVERAL MODEL
RUNS OF ABOVE SCENARIO. ECMWF IS STILL BRINGING ANOTHER SHORTWAVE
INTO THE PLAINS WEDNESDAY...SO BETTER CHANCES RETURN THEN.

TEMPERATURES TODAY AND SUNDAY WILL DEPEND ON AMOUNT OF SUNSHINE
REALIZED...BUT MOST AREAS SHOULD APPROACH 80 TODAY THEN COOL INTO
THE 70S SUNDAY. TEMPERATURES FOR MONDAY AND BEYOND SHOULD BE MORE
SEASONAL...AND NOT MANY CHANGES WERE MADE TO THE GOING FORECAST.

&&

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

DERGAN

Hazardous weather outlook, May 5, 11:54 AM CDT, 2 hours 38 minutes before

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In the hours before

Local storm report, May 5, 11:06 AM CDT, 3 hours 26 minutes before

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Local storm report, May 5, 11:47 AM CDT, 2 hours 45 minutes before

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Local storm report, May 5, 11:57 AM CDT, 2 hours 35 minutes before

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Local storm report, May 5, 12:25 PM CDT, 2 hours 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1225 PM CDT SAT MAY 05 2007

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

1155 AM     HAIL             5 W NEWMAN GROVE        41.75N 97.87W
05/05/2007  E0.25 INCH       BOONE              NE   PUBLIC

1155 AM     HAIL             2 S BATTLE CREEK        41.97N 97.60W
05/05/2007  E0.88 INCH       MADISON            NE   TRAINED SPOTTER

&&

JB

Local storm report, May 5, 12:49 PM CDT, 1 hour 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1249 PM CDT SAT MAY 05 2007

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

1242 PM     HAIL             2 S PIERCE              42.17N 97.53W
05/05/2007  E0.88 INCH       PIERCE             NE   TRAINED SPOTTER

&&

JB

Local storm report, May 5, 1:22 PM CDT, 1 hour 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
122 PM CDT SAT MAY 05 2007

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

0120 PM     HAIL             CROFTON                 42.73N 97.50W
05/05/2007  M1.00 INCH       KNOX               NE   CO-OP OBSERVER

&&

LANDSVORK

The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 1:54 AM CDT	Severe Thunderstorm Warning	OAX	Pawnee	18 min
May 5, 2:46 AM CDT	Severe Thunderstorm Warning	OAX	Butler, Platte	44 min
May 5, 5:56 AM CDT	Severe Thunderstorm Warning	OAX	Gage	34 min
May 5, 9:48 AM CDT	Severe Thunderstorm Warning	OAX	Burt	27 min
May 5, 11:32 AM CDT	Severe Thunderstorm Warning	OAX	Platte	28 min
May 5, 11:49 AM CDT	Severe Thunderstorm Warning	OAX	Boone, Madison	41 min
May 5, 12:22 PM CDT	Severe Thunderstorm Warning	OAX	Pierce	38 min
May 5, 12:38 PM CDT	Severe Thunderstorm Warning	OAX	Knox	37 min
May 5, 1:09 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox	21 min
May 5, 3:30 PM CDT	Tornado Warning	OAX	Knox	45 min
May 5, 3:38 PM CDT	Flash Flood Watch	OAX	Antelope, Boone, Burt, Butler, Cass, Cedar and 24 more	32 hr
May 5, 3:45 PM CDT	Severe Thunderstorm Warning	OAX	Boone	30 min
May 5, 3:58 PM CDT	Severe Thunderstorm Warning	OAX	Antelope	47 min
May 5, 4:09 PM CDT	Tornado Warning	OAX	Knox	20 min
May 5, 4:29 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson	46 min
May 5, 4:31 PM CDT	Severe Thunderstorm Warning	OAX	Pierce	29 min
May 5, 4:36 PM CDT	Tornado Warning	OAX	Pierce	24 min
May 5, 4:39 PM CDT	Severe Thunderstorm Warning	OAX	Saline	51 min
May 5, 4:51 PM CDT	Severe Thunderstorm Warning	OAX	Knox	39 min
May 5, 4:59 PM CDT	Tornado Warning	OAX	Pierce	16 min
May 5, 5:05 PM CDT	Tornado Warning	OAX	Knox	55 min
May 5, 5:07 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Platte	38 min
May 5, 5:12 PM CDT	Tornado Warning	OAX	Saline	33 min
May 5, 5:25 PM CDT	Severe Thunderstorm Warning	OAX	Seward	53 min
May 5, 5:34 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster	56 min
May 5, 5:43 PM CDT	Severe Thunderstorm Warning	OAX	Saline	22 min
May 5, 5:53 PM CDT	Flash Flood Warning	OAX	Lancaster, Saline	3 hr
May 5, 6:09 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	66 min
May 5, 6:20 PM CDT	Flash Flood Warning	OAX	Saunders	3 hr
May 5, 6:27 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster	33 min
May 5, 6:46 PM CDT	Severe Thunderstorm Warning	OAX	Dodge, Douglas, Washington	44 min
May 5, 10:08 AM CDT	Severe Thunderstorm Warning	OAX	Monona	37 min
May 5, 10:44 AM CDT	Severe Thunderstorm Warning	OAX	Monona	31 min
May 5, 6:42 PM CDT	Severe Thunderstorm Warning	OAX	Fremont	23 min
May 5, 6:51 PM CDT	Severe Thunderstorm Warning	OAX	Mills	24 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.