Alert archive / Nebraska / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 63, NWS Omaha, NE

April 19, 2017Johnson County, Otoe County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Apr 19, 2017, 6:30 PM CDT for Johnson County, Otoe County, Nebraska. It was in force for 30 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 19, 2017, 6:30 PM CDT (23:30 UTC)
Expired: Apr 19, 2017, 7:00 PM CDT
In force: 30 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Johnson County, NE, Otoe County, NE

The radar

The Omaha radar (KOAX), 83 km from the middle of the area, began a volume at 23:31 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.

What was reported inside it

Time	Report	Where	Remark
Apr 19, 6:37 PM CDT	HAIL 1	4 S Douglas, NE
Apr 19, 6:37 PM CDT	HAIL 1	4 S Douglas, NE
Apr 19, 6:40 PM CDT	HAIL 0.88	Douglas, NE	HAIL UP TO NICKEL SIZE IN COMBINATION WITH WINDS ESTIMATED NEAR 50 MPH DID PRODUCE SOME DAMAGE TO SIDING ON A HOUSE. RAINFALL 0.80 IN ABOUT 20 MINUTES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 7 minutes after it went out.

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
Apr 19, 3:23 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.5 hours before the alert went out and 83 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1072 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 314 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

719 
WUUS53 KOAX 192330
SVROAX
NEC097-131-200000-
/O.NEW.KOAX.SV.W.0063.170419T2330Z-170420T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
630 PM CDT WED APR 19 2017

The National Weather Service in Omaha has issued a

* Severe Thunderstorm Warning for...
  Northern Johnson County in southeastern Nebraska...
  Southwestern Otoe County in southeastern Nebraska...

* Until 700 PM CDT

* At 630 PM CDT, a severe thunderstorm was located near Douglas, or
  21 miles southeast of Lincoln, moving east at 35 mph.

  HAZARD...Quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Damage to vehicles is expected. 

* Locations impacted include...
  Syracuse, Cook, Douglas and Burr. 

This includes Highway 2 IN Nebraska between mile markers 490 and 493.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 1000 PM CDT for southeastern
Nebraska.

LAT...LON 4050 9646 4061 9647 4065 9645 4069 9606
      4048 9607
TIME...MOT...LOC 2330Z 268DEG 31KT 4056 9644 

HAIL...1.00IN
WIND...<50MPH
 
$$

FOBERT

2 follow-up statements

562 
WWUS53 KOAX 192347
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
647 PM CDT WED APR 19 2017

NEC097-131-200000-
/O.CON.KOAX.SV.W.0063.000000T0000Z-170420T0000Z/
Johnson NE-Otoe NE-
647 PM CDT WED APR 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR NORTHEASTERN JOHNSON AND SOUTHWESTERN OTOE COUNTIES...

At 647 PM CDT, a severe thunderstorm was located 6 miles southwest of
Syracuse, or 28 miles southeast of Lincoln, moving east at 35 mph.

HAZARD...Quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Damage to vehicles is expected. 

Locations impacted include...
Syracuse, Cook and Burr. 

This includes Highway 2 IN Nebraska between mile markers 490 and 493.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 1000 PM CDT for southeastern
Nebraska.

LAT...LON 4052 9633 4060 9632 4067 9630 4069 9606
      4048 9607
TIME...MOT...LOC 2347Z 261DEG 32KT 4059 9624 

HAIL...1.00IN
WIND...<50MPH
 
$$

FOBERT

609 
WWUS53 KOAX 192358
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
658 PM CDT WED APR 19 2017

NEC097-131-200008-
/O.EXP.KOAX.SV.W.0063.000000T0000Z-170420T0000Z/
Johnson NE-Otoe NE-
658 PM CDT WED APR 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN JOHNSON AND
SOUTHWESTERN OTOE COUNTIES WILL EXPIRE AT 700 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

A tornado watch remains in effect until 1000 PM CDT for southeastern
Nebraska.

LAT...LON 4052 9633 4060 9632 4067 9630 4069 9606
      4048 9607
TIME...MOT...LOC 2358Z 268DEG 31KT 4059 9612 

$$

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 Apr 19, 2:30 PM CDT, 4 hours earlier.

Area forecast discussion, Apr 19, 2:30 PM CDT, 4 hours before

Area Forecast Discussion
National Weather Service Omaha/Valley NE
230 PM CDT Wed Apr 19 2017

.SHORT TERM...(Tonight through Saturday)
Issued at 230 PM CDT Wed Apr 19 2017

Main concern is potential for severe thunderstorms through the
evening hours.

The atmosphere has continued to destabilize as temperatures south
of the warm front warmed into the 70s. Meanwhile, northeast
Nebraska was only in the mid to upper 40s. Surface low will
track northeast this evening, probably reaching southeast
Minnesota by just after midnight. The strong to severe storms
should exit our area prior to 11 pm, but some high based showers
still seem possible behind the front has depicted by recent
experimental HRRR and experimental HRRR model output. Recent RAP
model runs however are dry. Will maintain some low POPs for now
well behind the front into the early morning hours. Look for
northwest winds and lows in the 40s overnight.

After tonight, we have a dry forecast until Friday afternoon.
After the shortwave energy moves through tonight, we should see
mid level ridging move in from the west. But at the same time, a
trough will be digging from British Columbia Canada into western
Colorado. Cool high pressure at the surface should build over
eastern Nebraska and southwest Iowa Thursday, then move east.
Current model guidance is not in exact agreement, but it appears
that a Rex Block pattern should develop over the northern and
central parts of the Plains, with the mid level low portion of the
block slowly tracking east across Kansas and Missouri Friday
through Saturday. Some precipitation, which may be locally heavy,
should affect about the southern half of the forecast area.
Highest chances are from Friday night into Saturday morning. High
temperatures both Friday and Saturday are expected to be in the
upper 50s to mid 60s.

.LONG TERM...(Saturday night through Wednesday)
Issued at 230 PM CDT Wed Apr 19 2017

Temperatures will moderate to highs in the upper 60s to around 70
for Sunday, then mainly lower 70s for Monday. Rain chances look
fairly low on those days, except in northeast Nebraska. It looks
like the main precipitation shield with a low pressure system
moving through the region should stay up across the Dakotas and
Minnesota.

Another couple of systems will move through the mid part of the
country next week. One will be Tuesday night into Wednesday, with
another Wednesday night into Friday. The late week system looks
cool, but not cool enough for any snow in our area.

&&

.AVIATION...(For the 18Z TAFS through 18Z Thursday afternoon)
Issued at 1205 PM CDT Wed Apr 19 2017

Expect some improvement in ceilings at KOMA and KLNK for a while
this afternoon until TSRA develop. Did not include strong winds or
hail in TAFs for now due to low confidence on being right at the
site, but will amend as needed. MVFR ceilings are expected to move
in behind the cold front for tonight, then lift late tonight or
Thursday morning.

&&

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

SHORT TERM...Miller
LONG TERM...Miller
AVIATION...Miller

Hazardous weather outlook, Apr 19, 3:33 PM CDT, 2 hours 57 minutes before

Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
333 PM CDT Wed Apr 19 2017

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-201045-
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-
333 PM CDT Wed Apr 19 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 THURSDAY

A tornado watch has been issued for southwest Iowa and parts of
eastern Nebraska, which is in effect until 10 pm. Storms could
produce large hail and damaging winds. There is also some
potential for tornadoes. The storms may form into a line, with
that line moving eastward through the evening.

A moist and unstable environment, in combination with adequate
wind shear, will be in place this afternoon and into the evening.
This should allow development of some supercell type storms.

.DAYS TWO THROUGH SEVEN...THURSDAY NIGHT THROUGH WEDNESDAY

The probability for hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotters should be alert and ready for activation. Follow your
local activation guidelines. Please send us reports of any severe
weather you may observe.

In the hours before

Local storm report, Apr 19, 5:32 PM CDT, 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
532 PM CDT WED APR 19 2017

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

0525 PM     HAIL             LINCOLN                 40.82N 96.69W
04/19/2017  E1.75 INCH       LANCASTER          NE   TRAINED SPOTTER

            AT THE UNIVERSITY OF NEBRASKA MAIN CAMPUS

&&

DERGAN

Special weather statement, Apr 19, 5:43 PM CDT, 47 minutes before

Special Weather Statement
National Weather Service Omaha/Valley Nebraska
543 PM CDT WED APR 19 2017

IAZ055-069-NEZ045-052-192315-
Pottawattamie IA-Harrison IA-Washington NE-Douglas NE-
543 PM CDT WED APR 19 2017

...Significant Weather Advisory for NORTHWESTERN POTTAWATTAMIE...
SOUTH CENTRAL HARRISON...SOUTHEASTERN WASHINGTON AND NORTHEASTERN
DOUGLAS COUNTIES UNTIL 615 PM CDT...

At 542 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles southwest of Fort Calhoun, or in north Omaha, moving east at
40 mph.

Dime size hail will be possible with this storm.

Locations impacted include...
Northern Omaha, Underwood, Fort Calhoun, Carter Lake, Bennington,
Crescent, McClelland, Washington, Hitchcock Nature Center and Wilson
Island State Park.

This includes the following highways...
 Highway 75 IN Nebraska between mile markers 94 and 108.
 Interstate 29 between mile markers 58 and 74.
 Interstate 80 IN Iowa between mile markers 11 and 17.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm 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 tornado watch remains in effect until 1000 PM CDT for southwestern
Iowa...and east central Nebraska.

LAT...LON 4129 9619 4138 9626 4155 9589 4153 9573
      4142 9565 4130 9570
TIME...MOT...LOC 2242Z 247DEG 36KT 4136 9610

MAYES

Local storm report, Apr 19, 5:44 PM CDT, 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
544 PM CDT WED APR 19 2017

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

0525 PM     HAIL             2 NW WESTERN            40.41N 97.23W
04/19/2017  E0.75 INCH       SALINE             NE   TRAINED SPOTTER

&&

DERGAN

Local storm report, Apr 19, 5:51 PM CDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
551 PM CDT WED APR 19 2017

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

0550 PM     HAIL             10 N FAIRBURY           40.29N 97.18W
04/19/2017  M1.75 INCH       JEFFERSON          NE   EMERGENCY MNGR

&&

DPEARSON

Special weather statement, Apr 19, 5:53 PM CDT, 37 minutes before

Special Weather Statement
National Weather Service Omaha/Valley Nebraska
553 PM CDT WED APR 19 2017

IAZ043-NEZ015-034-192330-
Monona IA-Thurston NE-Burt NE-
553 PM CDT WED APR 19 2017

...Special Weather Statement...

At 553 PM CDT, Doppler radar was tracking a strong thunderstorm near
Macy, or 27 miles south of Sioux City, moving east at 40 mph.

Half inch hail will be possible with this storm.

Locations impacted include...
Whiting, Macy, Lewis And Clark State Park, Kennebec and Omaha
Reservation.

This includes the following highways...
 Highway 75 IN Nebraska between mile markers 150 and 159.
 Interstate 29 between mile markers 115 and 125.

A tornado watch remains in effect until 1000 PM CDT for west central
Iowa...and east central Nebraska.

LAT...LON 4221 9598 4208 9592 4199 9641 4212 9645
      4222 9626
TIME...MOT...LOC 2253Z 255DEG 34KT 4210 9632

MAYES

Special weather statement, Apr 19, 6:25 PM CDT, 5 minutes before

Special Weather Statement
National Weather Service Omaha/Valley Nebraska
625 PM CDT WED APR 19 2017

IAZ055-NEZ034-045-200000-
Harrison IA-Burt NE-Washington NE-
625 PM CDT WED APR 19 2017

...Significant Weather Advisory for NORTHWESTERN HARRISON...
SOUTHEASTERN BURT AND NORTH CENTRAL WASHINGTON COUNTIES UNTIL 700 PM
CDT...

At 625 PM CDT, Doppler radar was tracking a strong thunderstorm near
Mondamin, or 32 miles north of Omaha, moving east at 35 mph.

Dime size hail will be possible with this storm.

Locations impacted include...
Tekamah, Mondamin, Pisgah, Herman, Magnolia, Little Sioux and Willow
Lake Recreation Area.

This includes the following highways...
 Highway 75 IN Nebraska between mile markers 129 and 132.
 Interstate 29 between mile markers 86 and 95.

A tornado watch remains in effect until 1000 PM CDT for southwestern
Iowa...and east central Nebraska.

LAT...LON 4164 9620 4178 9626 4185 9595 4186 9577
      4178 9567 4171 9576
TIME...MOT...LOC 2325Z 250DEG 32KT 4173 9608

MAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 1:43 AM CDT	Special Weather Statement	OAX	Saunders	32 min
Apr 19, 2:31 AM CDT	Special Weather Statement	OAX	Douglas	29 min
Apr 19, 4:56 AM CDT	Special Weather Statement	OAX	Douglas	34 min
Apr 19, 6:22 AM CDT	Special Weather Statement	OAX	Douglas	23 min
Apr 19, 6:40 AM CDT	Severe Thunderstorm Warning	OAX	Douglas, Washington	20 min
Apr 19, 4:31 PM CDT	Special Weather Statement	OAX	Seward	29 min
Apr 19, 4:55 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Seward	35 min
Apr 19, 5:15 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Saline, Seward	30 min
Apr 19, 5:20 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson, Saline	25 min
Apr 19, 5:24 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Lancaster, Otoe	36 min
Apr 19, 5:35 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Jefferson, Saline	25 min
Apr 19, 5:42 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Johnson, Lancaster, Otoe, Saline	48 min
Apr 19, 5:43 PM CDT	Special Weather Statement	OAX	Douglas	32 min
Apr 19, 5:59 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Jefferson	31 min
Apr 19, 6:12 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Lancaster	11 min
Apr 19, 6:33 PM CDT	Special Weather Statement	OAX	Sarpy	27 min
Apr 19, 6:34 PM CDT	Special Weather Statement	OAX	Gage, Johnson	41 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2017 Every severe thunderstorm warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.