Alert archive / Nebraska / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 55, NWS Omaha, NE

May 2, 2012Lancaster County, Seward County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at May 2, 2012, 12:00 AM CDT for Lancaster County, Seward County, Nebraska. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 2, 2012, 12:00 AM CDT (05:00 UTC)
Expired: May 2, 2012, 12:30 AM CDT
In force: 30 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Lancaster County, NE, Seward County, NE

The radar

The Omaha radar (KOAX), 57 km from the middle of the area, began a volume at 05:02 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

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 1, 9:18 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 5.0 hours before the alert went out and 57 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: 1502 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1477 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

929 
WUUS53 KOAX 020500
SVROAX

NEC109-159-020530-
/O.NEW.KOAX.SV.W.0055.120502T0500Z-120502T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1200 AM CDT WED MAY 2 2012

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN LANCASTER COUNTY IN  NEBRASKA...
  NORTHEASTERN SEWARD COUNTY IN  NEBRASKA...

* UNTIL 1230 AM CDT

* AT 1158 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS 
  INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE 
  HAIL. THIS STORM WAS LOCATED NEAR GARLAND...OR 19 MILES NORTHWEST 
  OF LINCOLN...AND MOVING EAST AT 25 MPH. 

* LOCATIONS IMPACTED INCLUDE...
  GARLAND AND RAYMOND. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR 
PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR 
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE 
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4095 9705 4104 9703 4105 9671 4097 9669
      4092 9675
TIME...MOT...LOC 0458Z 267DEG 22KT 4098 9699 
WIND...HAIL <50MPH 1.00IN

$$

BOUSTEAD

2 follow-up statements

041 
WWUS53 KOAX 020518
SVSOAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1218 AM CDT WED MAY 2 2012

NEC159-020540-
/O.CAN.KOAX.SV.W.0055.000000T0000Z-120502T0530Z/
SEWARD NE-
1218 AM CDT WED MAY 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SEWARD COUNTY 
IS CANCELLED...

THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS 
MOVED OUT OF THE WARNED AREA. THEREFORE THE WARNING HAS BEEN 
CANCELLED. 

LAT...LON 4094 9690 4104 9690 4105 9671 4097 9669
      4092 9675
TIME...MOT...LOC 0518Z 267DEG 22KT 4099 9684 

$$

NEC109-020530-
/O.CON.KOAX.SV.W.0055.000000T0000Z-120502T0530Z/
LANCASTER NE-
1218 AM CDT WED MAY 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM 
CDT FOR NORTHWESTERN LANCASTER COUNTY...

AT 1217 AM CDT...NATIONAL WEATHER SERVICE METEROLOGISTS INDICATED 
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL AND 
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR 
VALPARAISO...OR 14 MILES NORTHWEST OF LINCOLN...MOVING EAST AT 25 
MPH. 

LOCATIONS IMPACTED INCLUDE...
RAYMOND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MILES 
PER HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY 
RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST 
FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO 
DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4094 9690 4104 9690 4105 9671 4097 9669
      4092 9675
TIME...MOT...LOC 0517Z 267DEG 22KT 4099 9684 
WIND...HAIL 60MPH 1.00IN

$$

FOBERT

454 
WWUS53 KOAX 020530
SVSOAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1230 AM CDT WED MAY 2 2012

NEC109-020540-
/O.EXP.KOAX.SV.W.0055.000000T0000Z-120502T0530Z/
LANCASTER NE-
1230 AM CDT WED MAY 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN LANCASTER 
COUNTY WILL EXPIRE AT 1230 AM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR 
PROPERTY. THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.  
HOWEVER SMALL HAIL IS STILL POSSIBLE WITH THIS THUNDERSTORM.

IN ADDITION...SEVERE THUNDERSTORM REDEVELOPMENT REMAINS POSSIBLE...
AND A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 2 AM CDT.


LAT...LON 4094 9690 4104 9690 4105 9671 4097 9669
      4092 9675
TIME...MOT...LOC 0529Z 267DEG 22KT 4099 9684 

$$

FOBERT

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 1, 6:34 PM CDT, 5 hours 26 minutes earlier.

Area forecast discussion, May 1, 6:34 PM CDT, 5 hours 26 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
634 PM CDT TUE MAY 1 2012

.AVIATION...
00Z TAFS FOR KOMA...KLNK...AND KOFK.

CURRENT LINE OF CONVECTION TRACKING NORTH OF TAF SITES BUT
SOME CHANCE FOR KOFK AND KOMA IN 02Z-06Z TIME FRAME. OTHERWISE
SOME POTENTIAL FOR IFR CIGS DEVELOPING AFTER 09Z AS FRONT STALLS
OVER THE AREA AND WINDS BECOME LIGHT WITH RATHER MOIST LOW LEVELS
INDICATED EAST OF THE BOUNDARY. CONDITIONS IMPROVE TO VFR AFTER
13Z WITH INCREASING SOUTH WINDS BY 19Z.

&&

.PREV DISCUSSION... /ISSUED 341 PM CDT TUE MAY 1 2012/

SHORT TERM...TONIGHT THROUGH FRIDAY

GOING FCST IS IN GOOD SHAPE...ONLY MINOR TWEAKS MADE. MAIN CONCERN
THEN CONTINUES TO BE PINNING DOWN AREAL COVERAGE OF SVR STORM
ACTIVITY THIS EVENING. AS OF NOW IT APPEARS THAT THE UPPER MIDWEST
WILL BE PRIME FOR SVR STORMS IN ASSOCIATED WITH LIFTING WARM FRONT...
WITH ANOTHER AREA OF RISK ASSOCIATED WITH COOL FRONT CURRENTLY
DROPPING THRU THE DAKOTAS. HRRR AND RAP SOLUTIONS HAVE BEEN RATHER
CONSISTENT TODAY SUGGESTING LINE OF CONVECTION MOVING INTO THE NRN
CWA BY EARLY EVENING. ESRH AROUND 360 M2/S2 AND MUCAPES 2000 J/KG OR
SO SHOULD BE ENOUGH TO POP SOME SVR MAINLY OVER NORTHEAST NEB.
AMPLIFYING TROF DIG OVER THE WRN CONUS WILL REPLACE THE NEAR-ZONAL
FLOW WITH LOW AMPLITUDE UPPER RIDGE GRADUALLY BUILDING OVER THE
PLAINS. THIS WILL ACT TO HINDER BNDRY PROGRESSION ANY FARTHER SOUTH
AND KEEP IT INVOF THE CWA. ON WEDNESDAY...MUCAPES INCREASE TO 4500
J/KG BY AFTERNOON BUT DEEP LAYER SHEAR IS MORE FOCUSED NORTH. THUS
NORTHEAST NEB MAY BE UNDER THE GUN AGAIN LATE WEDNESDAY
AFTN/EVENING. THURSDAY THROUGH FRIDAY MODELS PROG SEVERAL IMPULSES
EJECTING OUT OF THE SOUTHWESTERN STATES MAY HELP DESTABILIZE ENOUGH
TO POP OFF ADDITIONAL CONVECTION.

DEE

LONG TERM...FRIDAY NIGHT THROUGH TUESDAY

FAIRLY ACTIVE WEATHER PATTERN SHOULD CONTINUE INTO EARLY NEXT WEEK
AS UPPER TROUGH REMAIN TO OUR WEST...EJECTING WAVES OF ENERGY INTO
THE PLAINS.

WARM ADVECTION FRIDAY NIGHT MAY SPARK THUNDERSTORMS OVER THE
NORTHERN CWA...NORTH OF A EAST-WEST WARM FRONT BISECTING OUR AREA.
THOSE SHOULD MOVE ON OFF TO THE NORTHEAST FAIRLY QUICKLY SATURDAY
MORNING...LEAVING OUR CWA IN A VERY UNSTABLE AIRMASS BY SATURDAY
AFTERNOON. CAPPING UNDER WEAK MID LEVEL RIDGE MAY PRECLUDE
DEVELOPMENT MUCH OF THE DAY...MOST LIKELY WAITING FOR LOWERING
HEIGHTS AS RIDGE SLIDES EAST SATURDAY EVENING. THUNDERSTORMS ARE
GOOD BET THEN...ESPECIALLY IN THE NORTH WHERE A COLD FRONT WILL BE
APPROACHING OVERNIGHT.

THAT FRONT WILL DRIFT ACROSS THE AREA SUNDAY...MAINTAINING A FAIRLY
HIGH CHANCE FOR CONTINUING RAIN AND THUNDER. COOLER AIR WILL
FOLLOW...BUT THE CHANCE FOR RAIN OR SHOWERS WILL STILL EXIST AS
MOIST SOUTHWEST FLOW ALOFT RIDES OVER COOL SURFACE LAYER. THIS
PATTERN PERSISTS THROUGH TUESDAY.

TEMPERATURES LOOK WARM SATURDAY WITH SOUTHERLY FLOW AND MORE
HUMIDITY. HAVE HIGHS IN THE 80S THEN. RAIN AND COLD FRONTAL PASSAGE
WILL COOL HIGHS INTO THE 70S SUNDAY...THEN ONLY 60S FOR MONDAY AND
TUESDAY INFLUENCED BY NORTH TO EAST LOW LEVEL WIND COMPONENT.

DERGAN

&&

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

FOBERT

Hazardous weather outlook, May 1, 5:04 PM CDT, 6 hours 56 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
504 PM CDT TUE MAY 1 2012

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-021215-
MONONA-HARRISON-SHELBY-POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT-
PAGE-KNOX-CEDAR-THURSTON-ANTELOPE-PIERCE-WAYNE-BOONE-MADISON-
STANTON-CUMING-BURT-PLATTE-COLFAX-DODGE-WASHINGTON-BUTLER-
SAUNDERS-DOUGLAS-SARPY-SEWARD-LANCASTER-CASS-OTOE-SALINE-
JEFFERSON-GAGE-JOHNSON-NEMAHA-PAWNEE-RICHARDSON-
504 PM CDT TUE MAY 1 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST
IOWA...WEST CENTRAL IOWA...EAST CENTRAL NEBRASKA...NORTHEAST
NEBRASKA AND SOUTHEAST NEBRASKA.

.DAY ONE...TONIGHT

ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED TO MOVE INTO
NORTHEAST NEBRASKA THIS EVENING...MAINLY AFTER 7 PM. THE
THUNDERSTORMS WILL CONTINUE MOVING EAST SOUTHEAST INTO EAST
CENTRAL NEBRASKA AND WESTERN IOWA MAINLY AFTER 9 PM. DUE TO
FAVORABLE INSTABILITY AND SHEAR...SOME OF THESE THUNDERSTORMS MAY
BE SEVERE THIS EVENING AND EARLY TONIGHT. LARGE HAIL AND DAMAGING
WINDS WILL BE THE PRIMARY THREATS WITH THE THUNDERSTORMS. NEAR OR
AFTER MIDNIGHT ISOLATED SEVERE THUNDERSTORMS ARE ALSO POSSIBLE IN
SOUTHEAST NEBRASKA WITH THE THREAT OF LARGE HAIL. THE SEVERE
WEATHER THREAT IS EXPECTED TO END BY 3 AM.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

ISOLATED TO SCATTERED STRONG TO SEVERE THUNDERSTORMS ARE AGAIN
POSSIBLE ON WEDNESDAY WITH A STALLED FRONTAL BOUNDARY IN THE AREA.
THE MOST LIKELY TIME FOR SEVERE WEATHER ON WEDNESDAY WILL BE AFTER
4 PM. THE MAIN THREAT AREA FOR SEVERE WEATHER ON WEDNESDAY WILL BE
ALONG AND NORTH OF INTERSTATE 80. LARGE HAIL AND DAMAGING WINDS
WILL AGAIN BE THE MAIN THREAT.

THUNDERSTORMS ARE POSSIBLE AGAIN ON LATE THURSDAY AFTERNOON AND
EVENING...MAINLY IN SOUTHEAST NEBRASKA AND SOUTHWEST IOWA.
AGAIN...THERE IS A SLIGHT CHANCE FOR SEVERE WEATHER WITH THESE
STORMS...WITH LARGE HAIL AND DAMAGING WINDS THE PRIMARY HAZARDS.

A POTENTIALLY ACTIVE THUNDERSTORM PATTERN IS FORECAST FROM LATE
THIS WEEKEND INTO EARLY NEXT WEEK. PERIODS OF THUNDERSTORMS ARE
POSSIBLE THROUGHOUT THIS TIME...ESPECIALLY DURING THE AFTERNOON
AND OVERNIGHT HOURS...WITH THE POTENTIAL FOR SEVERE THUNDERSTORMS
AT TIMES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING IN NORTHEAST
NEBRASKA AND WEST CENTRAL IOWA.

In the hours before

Local storm report, May 1, 10:40 PM CDT, 1 hour 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1040 PM CDT TUE MAY 01 2012

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

1037 PM     HAIL             UTICA                   40.90N 97.35W
05/01/2012  E1.00 INCH       SEWARD             NE   TRAINED SPOTTER

&&

BMAYES

Special weather statement, May 1, 10:49 PM CDT, 1 hour 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1049 PM CDT TUE MAY 1 2012

NEZ050-065-020415-
BUTLER NE-SEWARD NE-
1049 PM CDT TUE MAY 1 2012

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN BUTLER AND SEWARD
COUNTIES UNTIL 1115 PM CDT...

AT 1046 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS
TRACKING A STRONG THUNDERSTORM NEAR STAPLEHURST...OR 23 MILES EAST
OF YORK...MOVING NORTHEAST AT 30 MPH.

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

LOCATIONS IMPACTED INCLUDE...
SEWARD...STAPLEHURST...DWIGHT...GARLAND...BEE AND TAMORA.

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.

&&

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM CDT
WEDNESDAY MORNING FOR EAST CENTRAL NEBRASKA.

LAT...LON 4101 9731 4119 9692 4118 9691 4094 9691
      4088 9726
TIME...MOT...LOC 0346Z 245DEG 26KT 4097 9717

BOUSTEAD

Local storm report, May 1, 10:54 PM CDT, 1 hour 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1054 PM CDT TUE MAY 01 2012

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

1040 PM     HAIL             UTICA                   40.90N 97.35W
05/01/2012  E1.25 INCH       SEWARD             NE   LAW ENFORCEMENT

&&

BMAYES

Special weather statement, May 1, 11:00 PM CDT, 1 hour before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1100 PM CDT TUE MAY 1 2012

NEZ044-045-051-052-020430-
DODGE NE-DOUGLAS NE-WASHINGTON NE-SAUNDERS NE-
1100 PM CDT TUE MAY 1 2012

...SIGNIFICANT WEATHER ADVISORY FOR DODGE...DOUGLAS...WASHINGTON
AND SAUNDERS COUNTIES UNTIL 1130 PM CDT...

AT 1056 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS
TRACKING A LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING
FROM NICKERSON TO WAHOO...OR ALONG A LINE EXTENDING FROM 31 MILES
NORTHWEST OF OMAHA TO 28 MILES NORTH OF LINCOLN...AND MOVING EAST
AT 40 MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
FREMONT...BLAIR...ELKHORN...WAHOO...VALLEY...YUTAN...ARLINGTON...
HOOPER...CEDAR BLUFFS...MEAD...WATERLOO...NICKERSON...INGLEWOOD...
KENNARD...WESTON...BENNINGTON...HERMAN...COLON...WASHINGTON AND
LESHARA.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 HIGHWAY 275 BETWEEN MILE MARKERS 140 AND 167.
 HIGHWAY 77 BETWEEN MILE MARKERS 93 AND 126.
 HIGHWAY 92 BETWEEN MILE MARKERS 442 AND 466.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER
SERVICE OFFICE IN OMAHA.

&&

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM CDT
WEDNESDAY MORNING FOR SOUTHWESTERN IOWA AND EAST CENTRAL NEBRASKA.

LAT...LON 4123 9616 4119 9677 4161 9655 4169 9625
      4169 9613 4165 9609 4160 9611 4159 9608
      4154 9610 4150 9604 4155 9601 4154 9601
TIME...MOT...LOC 0356Z 252DEG 33KT 4155 9650 4123 9665

BOUSTEAD

Special weather statement, May 1, 11:26 PM CDT, 34 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1126 PM CDT TUE MAY 1 2012

NEZ066-067-020500-
CASS NE-LANCASTER NE-
1126 PM CDT TUE MAY 1 2012

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN CASS AND LANCASTER
COUNTIES UNTIL 1200 AM CDT...

AT 1124 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS
TRACKING A LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING
FROM 6 MILES EAST OF VALPARAISO TO PLEASANT DALE...OR ALONG A LINE
EXTENDING FROM 39 MILES WEST OF OMAHA TO 10 MILES WEST OF LINCOLN...
AND MOVING EAST AT 35 MPH.

HAIL UP TO THE SIZE OF DIMES AND WIND GUSTS UP TO 45 MPH WILL BE
POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
LINCOLN...WAVERLY...GREENWOOD...MALCOLM...DENTON...RAYMOND AND
DAVEY.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 HIGHWAY 77 BETWEEN MILE MARKERS 57 AND 81.
 INTERSTATE 80 IN NEBRASKA BETWEEN MILE MARKERS 390 AND 420.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER
SERVICE OFFICE IN OMAHA.

&&

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM CDT
WEDNESDAY MORNING FOR EASTERN NEBRASKA.

LAT...LON 4070 9691 4086 9691 4105 9679 4105 9647
      4102 9646 4102 9636 4105 9635 4104 9632
      4068 9655
TIME...MOT...LOC 0424Z 263DEG 22KT 4105 9671 4077 9689

BOUSTEAD

Special weather statement, May 1, 11:51 PM CDT, 9 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1151 PM CDT TUE MAY 1 2012

IAZ055-069-NEZ045-052-020530-
POTTAWATTAMIE IA-HARRISON IA-DOUGLAS NE-WASHINGTON NE-
1151 PM CDT TUE MAY 1 2012

...SIGNIFICANT WEATHER ADVISORY FOR POTTAWATTAMIE...HARRISON...
DOUGLAS AND SOUTHEASTERN WASHINGTON COUNTIES UNTIL 1230 AM CDT...

AT 1148 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS
TRACKING A LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING
FROM MONDAMIN TO OMAHA...OR ALONG A LINE EXTENDING FROM 47 MILES
SOUTHWEST OF IDA GROVE TO 49 MILES NORTHEAST OF LINCOLN...AND
MOVING EAST AT 35 MPH.

HAIL UP TO THE SIZE OF PEAS AND WIND GUSTS UP TO 45 MPH WILL BE
POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
OMAHA...MISSOURI VALLEY...LOGAN...FORT CALHOUN...UNDERWOOD...
MINDEN...MONDAMIN...PERSIA...PISGAH...MODALE...CARTER LAKE...
WOODBINE...DUNLAP...NEOLA...CRESCENT...LITTLE SIOUX...MAGNOLIA AND
MCCLELLAND.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 29 BETWEEN MILE MARKERS 54 AND 89.
 INTERSTATE 80 IN IOWA BETWEEN MILE MARKERS 8 AND 29.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER
SERVICE OFFICE IN OMAHA.

&&

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM CDT
WEDNESDAY MORNING FOR SOUTHWESTERN IOWA AND EASTERN NEBRASKA.

LAT...LON 4127 9554 4126 9593 4124 9593 4126 9594
      4125 9612 4183 9604 4187 9588 4186 9556
      4161 9556 4160 9551 4158 9550
TIME...MOT...LOC 0448Z 257DEG 30KT 4177 9598 4133 9604

BOUSTEAD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 1, 9:54 PM CDT	Special Weather Statement	OAX	Butler	36 min
May 1, 10:08 PM CDT	Special Weather Statement	OAX	Colfax	37 min
May 1, 10:22 PM CDT	Severe Thunderstorm Warning	OAX	Seward	23 min
May 1, 10:49 PM CDT	Special Weather Statement	OAX	Seward	26 min
May 1, 11:00 PM CDT	Special Weather Statement	OAX	Douglas, Saunders, Washington	30 min
May 1, 11:26 PM CDT	Special Weather Statement	OAX	Lancaster	34 min
May 1, 11:39 PM CDT	Severe Thunderstorm Warning	OAX	Seward	24 min
May 2, 12:09 AM CDT	Special Weather Statement	OAX	Cass, Sarpy	36 min
May 2, 1:42 AM CDT	Severe Thunderstorm Warning	OAX	Douglas, Washington	33 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2012 Every severe thunderstorm warning in 2012

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.