Alert archive / Nebraska / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 108, NWS Omaha, NE

May 8, 2005Washington County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at May 8, 2005, 6:43 PM CDT for Washington County, Nebraska. It was in force for 25 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 8, 2005, 6:43 PM CDT (23:43 UTC)
Expired: May 8, 2005, 7:08 PM CDT
In force: 25 min
Issued by: NWS Omaha, NE
Area: Counties, with a storm outline in the text

County Washington County, NE

The radar

The Omaha radar (KOAX), 26 km from the middle of the area, began a volume at 23:42 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 8, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.7 hours before the alert went out and 27 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: 446 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 704 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.0

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 May 8, 4:03 PM CDT, 2 hours 40 minutes earlier.

Area forecast discussion, May 8, 4:03 PM CDT, 2 hours 40 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
403 PM CDT SUN MAY 8 2005

.DISCUSSION...

MAIN FORECAST CHALLENGES WILL STRONG THUNDERSTORMS THROUGH EARLY
TONIGHT...THEN THE LOCATION OF NEXT FRONTAL SYSTEM MIDWEEK AND ITS
EFFECTS ON POPS AND TEMPERATURES.

IN THE SHORT TERM...WATCHES APPEAR WELL JUSTIFIED.  18Z SOUNDING
SHOWED A SLIGHTLY STRENGTHENED AND LOWERED CAP FROM 12Z...WITH A
MORE UNSTABLE LAPSE RATE ABOVE ALONG WITH HIGHER CAPE.  THIS CAP HAS
BEEN BREACHED ALREADY IN SEVERAL LOCATIONS...WITH MORE TO COME.
SHEAR HAS STRENGTHENED SUBSTAINTIALLY FROM 12Z.  WHILE MUCH OF IT IS
UNIDIRECTIONAL...SLIGHT BACKING HAS OCCURRED PAST FEW HRS ALONG AND
E OF MO RVR FROM OMA NORTHWARD.  EXPECT A LOT OF LINEAR ORGANIZATION
OF CELLS...AS IS ALREADY APPARENT ON SATELLITE...BUT ANY CELL
MANAGING TO GET BY ITSELF COULD BECOME SUPERCELLULAR.  ENOUGH DRY
AIR AT MID LEVELS FOR WIND TO BE A THREAT ALONG WITH HAIL EVEN IN
LINEAR STORMS.  STRONGEST STORMS SHOULD END BY MIDNIGHT AS AFTERNOON
CAPE IS USED UP...THEN COLD FRONT SHOULD SWEEP REMNANTS EAST OF OUR
AREA BEFORE MORNING.

FOR MONDAY...ELECTED TO INTRODUCE A SLIGHT CHC OF WRAPAROUND SHOWERS
TO THE FAR NORTH...WHILE LEAVING THE REST OF THE AREA DRY.  COOL
ADVECTION WILL BE OVER BY LATE MORNING...WITH AFTN SHOWING NET 850
WARM ADVECTION WITH HIGHS STILL WELL IN THE 70S SOUTH...BUT HELD
DOWN BY COOL WRAPAROUND NORTH.

SOUTHERLY FLOW AND LOW LEVEL MOISTURE MAKE A RETURN ON TUESDAY.
WENT FOR NAM SUGGESTION THAT THERE COULD BE ENOUGH LIFT FOR SOME
AFTERNOON THUNDERSHOWERS...ESPECIALLY IN THE NORTH.

FROM TUESDAY NIGHT ONWARD...MODEL SOLUTIONS DIVERGE SERIOUSLY FOR
OUR AREA.  WHILE THERE IS GENERAL AGREEMENT THAT UPPER LOW WILL MOVE
FROM THE WEST COAST INTO THE GREAT BASIN...THEN GRADUALLY PHASE WITH
THE NORTHERN BRANCH AND EJECT OVER MT OR ND FRI...THE PLACEMENT OF
A SURFACE FRONT THROUGH THE CENTRAL PLANS IS MORE UNCERTAIN.  THERE
WILL BE A STRONG GRADIENT OF TEMPS AND POPS ACROSS THIS FRONT.  WITH
WARM HUMID AIR TO THE SOUTH...AND SW FLOW ALOFT...THIS SHOULD BE A
POTENT LIFT BOUNDARY WITH HEAVY RAIN POTENTIAL ON THE NORTH
SIDE...AS WELL AS SEVERE POTENTIAL NEAR AND SOUTH OF THE FRONT.
NAM DEVELOPS THE FRONT IN A SOUTHERLY POSITION NEAR THE NE/KS
BORDER...WHILE GFS IS MUCH FARTHER NORTH.  GFS HAS TRENDED A BIT
TOWARD SLOWER ECMWF SOLUTION...BUT ALSO HAS A BIAS WITH PUSHING
WARM FRONTS TOO FAR NORTH INTO A SHALLOW COLD POOL.  IN THIS
VERY UNCERTAIN FORECAST SITUATION...TOOK A BLEND OF PREVIOUS
FORECAST AND NEW NAM.  THIS WAS COOLER AND WETTER FOR MOST OF THE
TIME AND AREA THROUGH FRI...BUT WARMER IN THE SOUTH AS FRONT SETS
UP TUE.

AS UPPER TROUGH MOVES EAST OF THE AREA NEXT WEEKEND...DRIER
CONDITIONS SHOULD SET IN WITH NEAR NORMAL TEMPS.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...

NE...NONE.
IA...NONE.

&&

POLLACK

Hazardous weather outlook, May 8, 5:22 PM CDT, 1 hour 21 minutes before

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In the hours before

Special weather statement, May 8, 5:37 PM CDT, 1 hour 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
537 PM CDT SUN MAY 8 2005

NEZ017-031-032-042-090003-

...SEVERE THUNDERSTORM WATCH XXX HAS BEEN ISSUED UNTIL XXXX

IN NORTHEAST NEBRASKA
     PIERCE...STANTON...MADISON AND PLATTE

POLLACK

Special weather statement, May 8, 5:45 PM CDT, 58 minutes before

SPECIAL WEATHER STATEMENT...CORRECTED
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
545 PM CDT SUN MAY 8 2005

NEZ017-031-032-042-090015-

...SEVERE THUNDERSTORM WATCH 234 HAS BEEN CANCELLED FOR THE
FOLLOWING COUNTIES IN NORTHEAST NEBRASKA
     PIERCE...STANTON...MADISON AND PLATTE

THE WATCH REMAINS IN EFFECT UNTIL 9 PM FOR THE FOLLOWING COUNTIES...

IN EASTERN NEBRASKA...

JEFFERSON...GAGE...PAWNEE...RICHARDSON...NEMAHA...JOHNSON...SALINE...
SEWARD...LANCASTER....CASS...SARPY....DOUGLAS...SAUNDERS...BUTLER...
COLFAX...DODGE...WASHINGTON...BURT...CUMING...WAYNE...THURSTON.

IN SOUTHWEST IOWA...

MONONA...HARRISON...SHELBY...POTTAWATTAMIE...MONTGOMERY...MILLS...
FREMONT...PAGE.

POLLACK

Local storm report, May 8, 6:11 PM CDT, 32 minutes before

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Local storm report, May 8, 6:21 PM CDT, 22 minutes before

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Local storm report, May 8, 6:23 PM CDT, 20 minutes before

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Local storm report, May 8, 6:34 PM CDT, 9 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
May 7, 7:54 PM CDT	Severe Thunderstorm Warning	OAX	Boone	36 min
May 7, 8:27 PM CDT	Severe Thunderstorm Warning	OAX	Boone	63 min
May 7, 8:44 PM CDT	Severe Thunderstorm Warning	OAX	Cedar	46 min
May 7, 9:06 PM CDT	Severe Thunderstorm Warning	OAX	Madison	54 min
May 7, 9:59 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Pierce	46 min
May 7, 10:09 PM CDT	Severe Thunderstorm Warning	OAX	Boone	51 min
May 7, 10:19 PM CDT	Severe Thunderstorm Warning	OAX	Wayne	41 min
May 7, 10:45 PM CDT	Severe Thunderstorm Warning	OAX	Madison	45 min
May 7, 10:47 PM CDT	Severe Thunderstorm Warning	OAX	Cedar	28 min
May 8, 3:31 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy	44 min
May 8, 5:23 PM CDT	Severe Thunderstorm Warning	OAX	Gage	38 min
May 8, 6:00 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Pawnee	32 min
May 8, 6:05 PM CDT	Severe Thunderstorm Warning	OAX	Washington	40 min
May 8, 3:18 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie	42 min
May 8, 3:52 PM CDT	Severe Thunderstorm Warning	OAX	Shelby	26 min
May 8, 4:22 PM CDT	Severe Thunderstorm Warning	OAX	Shelby	23 min
May 8, 4:34 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie	41 min
May 8, 6:54 PM CDT	Severe Thunderstorm Warning	OAX	Harrison	36 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2005 Every severe thunderstorm warning in 2005

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.