Severe Thunderstorm Warning 87, NWS Omaha, NE

302 
WWUS53 KOAX 170303
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1003 PM CDT TUE MAY 16 2017

IAC129-137-155-170330-
/O.CON.KOAX.SV.W.0087.000000T0000Z-170517T0330Z/
Montgomery IA-Mills IA-Pottawattamie IA-
1003 PM CDT TUE MAY 16 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR NORTHWESTERN MONTGOMERY...NORTHEASTERN MILLS AND POTTAWATTAMIE
COUNTIES...

At 1002 PM CDT, a severe thunderstorm was located near Oakland, or 
20 miles southwest of Atlantic, moving east at 40 mph.

HAZARD...60 mph wind gusts and nickel size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Oakland, Avoca, Treynor, Underwood, Carson, Walnut, Shelby, Minden,
Elliott, Macedonia, Neola, Hancock, Henderson, Old Town Park, Farm
Creek Public Wildlife Area, Botna Bend Park and Arrowhead Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4104 9551 4145 9574 4148 9550 4150 9549
      4150 9540 4151 9539 4151 9516 4139 9515
      4116 9516 4116 9513 4109 9513
TIME...MOT...LOC 0302Z 258DEG 37KT 4127 9537 

HAIL...0.88IN
WIND...60MPH
 
$$

MILLER

409 
WWUS53 KOAX 170308
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1008 PM CDT TUE MAY 16 2017

IAC129-137-155-170330-
/O.CON.KOAX.SV.W.0087.000000T0000Z-170517T0330Z/
Montgomery IA-Mills IA-Pottawattamie IA-
1008 PM CDT TUE MAY 16 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR NORTHWESTERN MONTGOMERY...NORTHEASTERN MILLS AND EASTERN
POTTAWATTAMIE COUNTIES...

At 1007 PM CDT, a severe thunderstorm was located 5 miles east of
Oakland, or 16 miles southwest of Atlantic, moving east at 40 mph.

HAZARD...60 mph wind gusts and nickel size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Oakland, Avoca, Carson, Walnut, Shelby, Minden, Elliott, Macedonia,
Neola, Hancock, Henderson, Old Town Park, Farm Creek Public Wildlife
Area, Botna Bend Park and Arrowhead Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4105 9548 4146 9565 4148 9550 4150 9549
      4150 9540 4151 9539 4151 9516 4139 9515
      4116 9516 4116 9513 4109 9513
TIME...MOT...LOC 0307Z 258DEG 37KT 4128 9530 

HAIL...0.88IN
WIND...60MPH
 
$$

MILLER

148 
WWUS53 KOAX 170315
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1015 PM CDT TUE MAY 16 2017

IAC129-137-155-170330-
/O.CON.KOAX.SV.W.0087.000000T0000Z-170517T0330Z/
Montgomery IA-Mills IA-Pottawattamie IA-
1015 PM CDT TUE MAY 16 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR NORTHWESTERN MONTGOMERY...NORTHEASTERN MILLS AND EASTERN
POTTAWATTAMIE COUNTIES...

At 1015 PM CDT, a severe thunderstorm was located 7 miles northwest
of Griswold, or 15 miles southwest of Atlantic, moving northeast at
35 mph.

HAZARD...60 mph wind gusts and nickel size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Oakland, Avoca, Carson, Walnut, Shelby, Minden, Elliott, Macedonia,
Neola, Hancock, Henderson, Old Town Park, Farm Creek Public Wildlife
Area, Botna Bend Park and Arrowhead Park.

This includes the following highways...
 Highway 59 IN Iowa between mile markers 34 and 66.
 Interstate 80 IN Iowa near mile marker 23, and between mile markers
34 and 48.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4105 9548 4146 9565 4148 9550 4150 9549
      4150 9540 4151 9539 4151 9516 4139 9515
      4116 9516 4116 9513 4109 9513
TIME...MOT...LOC 0315Z 240DEG 32KT 4128 9527 

HAIL...0.88IN
WIND...60MPH
 
$$

MILLER

485 
WWUS53 KOAX 170321
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1021 PM CDT TUE MAY 16 2017

IAC129-137-155-170330-
/O.CON.KOAX.SV.W.0087.000000T0000Z-170517T0330Z/
Montgomery IA-Mills IA-Pottawattamie IA-
1021 PM CDT TUE MAY 16 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR NORTHWESTERN MONTGOMERY...NORTHEASTERN MILLS AND EASTERN
POTTAWATTAMIE COUNTIES...

At 1020 PM CDT, a severe thunderstorm was located near Griswold, or
14 miles southwest of Atlantic, moving east at 45 mph.

HAZARD...60 mph wind gusts and nickel size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Oakland, Avoca, Carson, Walnut, Shelby, Minden, Elliott, Macedonia,
Neola, Hancock, Henderson, Old Town Park, Farm Creek Public Wildlife
Area, Botna Bend Park and Arrowhead Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4105 9548 4146 9565 4148 9550 4150 9549
      4150 9540 4151 9539 4151 9516 4139 9515
      4116 9516 4116 9513 4109 9513
TIME...MOT...LOC 0320Z 263DEG 39KT 4123 9519 

HAIL...0.88IN
WIND...60MPH
 
$$

MILLER

274 
WWUS53 KOAX 170326
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1026 PM CDT TUE MAY 16 2017

IAC129-137-155-170336-
/O.EXP.KOAX.SV.W.0087.000000T0000Z-170517T0330Z/
Montgomery IA-Mills IA-Pottawattamie IA-
1026 PM CDT TUE MAY 16 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MONTGOMERY...
NORTHEASTERN MILLS AND EASTERN POTTAWATTAMIE COUNTIES WILL EXPIRE AT
1030 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However gusty winds are still possible with
this thunderstorm.

A severe thunderstorm watch remains in effect until midnight CDT for
southwestern Iowa.

LAT...LON 4105 9548 4146 9565 4148 9550 4150 9549
      4150 9540 4151 9539 4151 9516 4139 9515
      4116 9516 4116 9513 4109 9513
TIME...MOT...LOC 0326Z 241DEG 44KT 4126 9512 

$$

MILLER

Area Forecast Discussion
National Weather Service Omaha/Valley NE
317 PM CDT Tue May 16 2017

.SHORT TERM...(Tonight through Friday)
Issued at 315 PM CDT Tue May 16 2017

WV imagery this afternoon showing a deep longwave trof cutting
through the western CONUS with potent southern tier vort max
currently over southern CA/western AZ. At the surface...relatively
weak low pressure was centered in eastern CO with a stagnant
thermal boundary extending into eastern Neb then northern IA. A
second boundary/cold front was situated from central MN to
southwest SD. Daytime heating/influx of moisture has pushed
instability parameters to the extreme with MLCAPES 2500-3500J/kg
over the region.

A highly unstable environment will be in place to allow for
convective development in western KS this afternoon...which will
eventually reach the CWA early this evening. Expect updraft
initiation on nose of 8-9C/km low level lapse rates protruding into
moisture rich environment...promoting rapid storm development. All
this coincident to boundary layer theta-E convergence.

HRRR and RAP13 have been pretty consistent the last several runs
showing the cluster of western KS storms will cross into 0-3km bulk
shear of 40kt or so...forming into a QLCS. Complex is progged then
to quickly race along the Neb/KS border during the early evening
hours before crossing into southeastern Neb/extreme southwest IA.
Along with probable severe wind gusts(increasing layer differential
max theta-E)...an isolated tornado forming along the bowing line
segment cannot be ruled out.

Meanwhile farther north...narrow line of convection is progged to
fire later the afternoon along a stagnant surface boundary extending
from south-central Neb into west-central IA. Activity will expand
then in areal coverage mainly over northeast Neb/west-central IA
toward mid evening. Steep mid-level lapse rates topping moisture
rich boundary layer suggest severe hail producers are quite
probable.

In addition...a heavy rain threat will be in place as well tonight.
The last several runs of both NAM/GFS show continuity advertising a
high degree of precipitation efficiency consisting of deep warm
cloud layer/strong moist low level inflow...and 30-40 microbars of
omega coincident to PWS approaching 2"

Wednesday/Wednesday evening...core of southwest shortwave trof will
lift right over the CWA and bring wrap around precip mainly over the
northern CWA.

Precip chances continue Thursday afternoon through Friday associated
with a large and relatively slow moving upper low/several impulses
exiting the Rockies.

.LONG TERM...(Friday night through Tuesday)
Issued at 315 PM CDT Tue May 16 2017

Precip chances continue into the early part of next weekend
accompanied by a noticeable cooling trend into early next week.

&&

.AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon)
Issued at 1207 PM CDT Tue May 16 2017

Gusty south winds will continue this afternoon across eastern
Nebraska with scattered-broken clouds at around FL040.
Thunderstorms are expected to form to the west this afternoon
before moving into the area this evening. Short-term model
guidance remains in good agreement in suggesting that a bowing
line of storms will affect the Lincoln and Omaha areas between
about 01 and 04z. As such, a mention of strong wind gusts have
been included in the TAFs during that time frame. Otherwise,
expect episodic showers and thunderstorms overnight into Wednesday
morning with the potential for more widespread MVFR ceilings
developing late tonight.

&&

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

SHORT TERM...DEE
LONG TERM...DEE
AVIATION...Mead

Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
422 PM CDT Tue May 16 2017

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-171130-
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-
422 PM CDT Tue May 16 2017

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

.DAY ONE...TONIGHT AND WEDNESDAY

A highly unstable and moist environment will be in place to
promote severe thunderstorm development late this afternoon
before increasing in areal coverage through the evening. The
primary severe weather threat along and south of I-80 will be
damaging wind gusts with the potential for an isolated tornado.
For areas north of I-80...the main threat will be large hail and
damaging winds.

In addition...the possibility for heavy rainfall and localized
flooding is quite high in association with more intense
thunderstorms.

Even though the severe weather will likely come to a close around
midnight, the threat for flooding will continue with showers and
thunderstorms across the region later tonight.

Thunderstorms will also be possible again on Wednesday.

.DAYS TWO THROUGH SEVEN...WEDNESDAY NIGHT THROUGH TUESDAY

The chance of thunderstorms will extend into Wednesday evening and
again Thursday night through Saturday morning. Additional
thunderstorms are possible Monday into Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will liklely be needed late this afternoon and
tonight.

Fobert

Special Weather Statement
National Weather Service Omaha/Valley Nebraska
839 PM CDT TUE MAY 16 2017

NEZ066-068-089-090-092-170230-
Otoe NE-Gage NE-Pawnee NE-Lancaster NE-Johnson NE-
839 PM CDT TUE MAY 16 2017

...Significant Weather Advisory for SOUTHEASTERN LANCASTER...
JOHNSON...SOUTHWESTERN OTOE...NORTHWESTERN PAWNEE AND EASTERN GAGE
COUNTIES UNTIL 930 PM CDT...

At 839 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 3 miles south of Hickman to 5 miles northeast
of Blue Springs. Movement was northeast at 50 mph.

Dime size hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Tecumseh, Cortland, Sterling, Adams, Filley, Steinauer, Lewiston,
Virginia, Burr, Crab Orchard and Rockford State Recreation Area.

This includes the following highways...
 Highway 136 in Nebraska between mile markers 183 and 207.
 Highway 77 IN Nebraska between mile markers 39 and 41.

A severe thunderstorm watch remains in effect until midnight CDT for
southeastern Nebraska.

LAT...LON 4059 9626 4022 9615 4007 9661 4051 9672
TIME...MOT...LOC 0139Z 214DEG 42KT 4058 9665 4020 9659

MILLER

Special Weather Statement
National Weather Service Omaha/Valley Nebraska
855 PM CDT TUE MAY 16 2017

NEZ044-045-051>053-066>068-170230-
Saunders NE-Cass NE-Sarpy NE-Otoe NE-Lancaster NE-Washington NE-
Douglas NE-Dodge NE-
855 PM CDT TUE MAY 16 2017

...Significant Weather Advisory for WESTERN SARPY...SOUTHWESTERN
WASHINGTON...NORTHEASTERN LANCASTER...SOUTHEASTERN DODGE...
NORTHWESTERN OTOE...WESTERN DOUGLAS...SAUNDERS AND WESTERN CASS
COUNTIES UNTIL 930 PM CDT...

At 854 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 4 miles south of Weston to 4 miles north of
Bennet. Movement was northeast at 60 mph.

Nickel size hail and wind gusts of 50 to 55 mph will be possible with
these storms.

Locations impacted include...
Northeastern Lincoln, Fremont, Wahoo, Gretna, Waverly, Ashland,
Valley, Springfield, Arlington, Yutan, Waterloo, Bennet, Cedar
Bluffs, Mead, Greenwood, Nickerson, Inglewood, Weston, Elkhorn and
Murdock.

A severe thunderstorm watch remains in effect until midnight CDT for
southeastern and east central Nebraska.

LAT...LON 4163 9649 4111 9611 4062 9651 4121 9687
TIME...MOT...LOC 0154Z 205DEG 50KT 4113 9673 4075 9651

MILLER

Special Weather Statement
National Weather Service Omaha/Valley Nebraska
858 PM CDT TUE MAY 16 2017

IAZ069-080-090-091-170245-
Pottawattamie IA-Page IA-Fremont IA-Montgomery IA-
858 PM CDT TUE MAY 16 2017

...Significant Weather Advisory for NORTHEASTERN FREMONT...
MONTGOMERY...SOUTHEASTERN POTTAWATTAMIE AND NORTHERN PAGE COUNTIES
UNTIL 945 PM CDT...

At 858 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles east of Oakland to 6 miles southeast of
Emerson. Movement was northeast at 45 mph.

Dime size hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Red Oak, Villisca, Essex, Stanton, Elliott, Grant, Coburg, Hepburn,
Pierce Recreation Area and Viking Lake State Park.

This includes the following highways...
 Highway 34 IN Iowa between mile markers 30 and 51.
 Highway 59 IN Iowa near mile marker 16.

A severe thunderstorm watch remains in effect until midnight CDT for
southwestern Iowa.

LAT...LON 4081 9539 4128 9530 4134 9516 4116 9516
      4116 9493 4083 9493
TIME...MOT...LOC 0158Z 215DEG 37KT 4127 9527 4094 9533

MILLER

Special Weather Statement
National Weather Service Omaha/Valley Nebraska
932 PM CDT TUE MAY 16 2017

NEZ068-090>093-170315-
Otoe NE-Pawnee NE-Johnson NE-Nemaha NE-Richardson NE-
932 PM CDT TUE MAY 16 2017

...Significant Weather Advisory for SOUTHEASTERN JOHNSON...NEMAHA...
SOUTHEASTERN OTOE...RICHARDSON AND PAWNEE COUNTIES UNTIL 1015 PM
CDT...

At 931 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Talmage to 4 miles west of Summerfield.
Movement was northeast at 50 mph.

Dime size hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Auburn, Tecumseh, Pawnee City, Humboldt, Peru, Johnson, Table Rock,
Verdon, Summerfield, Stella, Shubert, Nemaha, Du Bois, Dawson,
Brownville, Salem, Brock, Elk Creek, Burchard and Steinauer.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A severe thunderstorm watch remains in effect until midnight CDT for
southeastern Nebraska.

LAT...LON 4052 9607 4052 9570 4054 9566 4052 9566
      4051 9569 4049 9568 4047 9569 4046 9564
      4042 9566 4034 9562 4031 9566 4031 9560
      4000 9568 4000 9645 4001 9645
TIME...MOT...LOC 0231Z 228DEG 43KT 4051 9606 3999 9643

MILLER

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
939 PM CDT TUE MAY 16 2017

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

0635 PM     TSTM WND DMG     OMAHA                   41.26N 96.01W
05/16/2017                   DOUGLAS            NE   BROADCAST MEDIA

            TREES DAMAGED AT GENE LEAHY MALL AT 13TH AND DOUGLAS

&&

KGROSS

Special Weather Statement
National Weather Service Omaha/Valley Nebraska
939 PM CDT TUE MAY 16 2017

IAZ043-055-056-069-079-NEZ045-052-053-067-170330-
Pottawattamie IA-Mills IA-Monona IA-Shelby IA-Harrison IA-Cass NE-
Sarpy NE-Washington NE-Douglas NE-
939 PM CDT TUE MAY 16 2017

...Significant Weather Advisory for EASTERN MONONA...NORTHWESTERN
MILLS...POTTAWATTAMIE...HARRISON...WESTERN SHELBY...NORTHEASTERN
SARPY...SOUTHEASTERN WASHINGTON...EASTERN DOUGLAS AND NORTHEASTERN
CASS COUNTIES UNTIL 1030 PM CDT...

At 939 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 5 miles southeast of Fort Calhoun to near
Glenwood. Movement was northeast at 55 mph.

Dime size hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Eastern Omaha, Council Bluffs, Bellevue, Blair, Plattsmouth,
Glenwood, Missouri Valley, Logan, Oakland, Treynor, Underwood, Fort
Calhoun, Shelby, Minden, Pacific Junction, Mondamin, Ute, Persia,
Modale and Pisgah.

A severe thunderstorm watch remains in effect until midnight CDT for
southwestern and west central Iowa...and southeastern and east
central Nebraska.

LAT...LON 4096 9587 4154 9616 4221 9572 4221 9567
      4187 9567 4186 9545 4133 9536
TIME...MOT...LOC 0239Z 233DEG 46KT 4139 9595 4103 9571

MILLER