Alert archive / Nebraska / Flash Flood Warnings in 2016

Flash Flood Warning 7, NWS Omaha, NE

May 26, 2016Lancaster County, Nebraska

NWS Omaha, NE issued this flash flood warning at May 26, 2016, 3:10 PM CDT for Lancaster County, Nebraska. It was in force for 5 hr. 5 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: May 26, 2016, 3:10 PM CDT (20:10 UTC)
Expired: May 26, 2016, 8:15 PM CDT
In force: 5 hr
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Flood severity: None

County Lancaster County, NE

The radar

The Omaha radar (KOAX), 68 km from the middle of the area, began a volume at 20:10 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
May 26, 3:13 PM CDT	FLOOD	3 S Lincoln, NE	WATER REPORTED OVER PORTIONS OF HIGHWAY 77.
May 26, 3:25 PM CDT	FLASH FLOOD	Lincoln, NE	THREE INCHES OF WATER FLOWING OVER ROAD ON 56TH STREET SOUTH OF HIGHWAY 2
May 26, 3:39 PM CDT	FLASH FLOOD	Lincoln, NE	MANY INTERSECTIONS IN SOUTHEAST LINCOLN FLOODED AND IMPASSIBLE.
May 26, 4:08 PM CDT	FLASH FLOOD	Lincoln, NE	48TH AND CORNHUSKER IS IMPASSABLE DUE TO FLOODING.
May 26, 5:48 PM CDT	FLASH FLOOD	4 Nnw Roca, NE	DEBRIS AND WATER OVER HIGHWAY 77. NO CARS BEING ALLOWED THROUGH. RELAYED THROUGH BROADCAST MEDIA.

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 4 storm reports to this flash flood warning; the first came 15 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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 8.2 hours before the alert went out and 67 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: 1783 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: -107 m²/s²
0-3 km storm-relative helicity: -78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

824 
WGUS53 KOAX 262010
FFWOAX
NEC109-270115-
/O.NEW.KOAX.FF.W.0007.160526T2010Z-160527T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
310 PM CDT THU MAY 26 2016

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL LANCASTER COUNTY IN SOUTHEASTERN NEBRASKA...

* UNTIL 815 PM CDT
    
* AT 309 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A THUNDERSTORM
  PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF
  RAIN HAVE ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN
  SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  LINCOLN...DENTON AND CONESTOGA STATE RECREATION AREA. 

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 HIGHWAY 2 IN NEBRASKA BETWEEN MILE MARKERS 466 AND 469.
 HIGHWAY 77 IN NEBRASKA BETWEEN MILEMARKERS 54 AND 63.
 INTERSTATE 80 IN NEBRASKA NEAR MILE MARKER 397.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4085 9653 4069 9651 4066 9680 4071 9688
      4081 9685

$$

PEARSON

3 follow-up statements

417 
WGUS73 KOAX 262024
FFSOAX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
324 PM CDT THU MAY 26 2016

NEC109-270115-
/O.CON.KOAX.FF.W.0007.000000T0000Z-160527T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LANCASTER NE-
324 PM CDT THU MAY 26 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR
CENTRAL LANCASTER COUNTY...

AT 322 PM CDT...TRAINED WEATHER SPOTTERS REPORTED THUNDERSTORMS
PRODUCING HEAVY RAIN IN MUCH OF THE LINCOLN METRO. UP TO TWO INCHES
OF RAIN HAVE ALREADY FALLEN. TWO TO THREE INCHES OF WATER WAS
FLOWING OVER THE ROAD ON 56TH STREET SOUTH OF HIGHWAY 2. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
LINCOLN...DENTON AND CONESTOGA STATE RECREATION AREA. 

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 HIGHWAY 2 IN NEBRASKA BETWEEN MILE MARKERS 466 AND 469.
 HIGHWAY 77 IN NEBRASKA BETWEEN MILEMARKERS 54 AND 63.
 INTERSTATE 80 IN NEBRASKA NEAR MILE MARKER 397.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4085 9653 4069 9651 4066 9680 4071 9688
      4081 9685

$$

DERGAN

711 
WGUS73 KOAX 262319
FFSOAX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
619 PM CDT THU MAY 26 2016

NEC109-270115-
/O.CON.KOAX.FF.W.0007.000000T0000Z-160527T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LANCASTER NE-
619 PM CDT THU MAY 26 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR
CENTRAL LANCASTER COUNTY...

AT 617 PM CDT...LOCAL LAW ENFORCEMENT REPORTED THAT DEBRIS AND WATER
WERE STILL OVER HIGHWAY 77 SOUTH OF LINCOLN. UP TO THREE INCHES OF
RAIN MAY HAVE FALLEN IN THE AREA EARLIER THIS AFTERNOON. ADDITIONAL
SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE THIS EVENING AND
OVERNIGHT.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
LINCOLN...DENTON AND CONESTOGA STATE RECREATION AREA. 

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 HIGHWAY 2 IN NEBRASKA BETWEEN MILE MARKERS 466 AND 469.
 HIGHWAY 77 IN NEBRASKA BETWEEN MILEMARKERS 54 AND 63.
 INTERSTATE 80 IN NEBRASKA NEAR MILE MARKER 397.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4085 9653 4069 9651 4066 9680 4071 9688
      4081 9685

$$

DEWALD

088 
WGUS73 KOAX 270104
FFSOAX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
804 PM CDT THU MAY 26 2016

NEC109-270113-
/O.CAN.KOAX.FF.W.0007.000000T0000Z-160527T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LANCASTER NE-
804 PM CDT THU MAY 26 2016

...THE FLASH FLOOD WARNING FOR CENTRAL LANCASTER COUNTY IS
CANCELLED...

FLOOD WATERS HAVE RECEDED...AND ARE NO LONGER EXPECTED TO POSE A
THREAT TO LIFE OR PROPERTY. PLEASE CONTINUE TO HEED ANY ROAD
CLOSURES.

LAT...LON 4085 9653 4069 9651 4066 9680 4071 9688
      4081 9685

$$

MEAD

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at May 26, 2:23 PM CDT, 47 minutes earlier.

Area forecast discussion, May 26, 2:23 PM CDT, 47 minutes before

Area Forecast Discussion
National Weather Service Omaha/Valley NE
223 PM CDT THU MAY 26 2016

.SHORT TERM...(tonight through Sunday)
Issued at 220 PM CDT Thu May 26 2016

Warm front was located across northeast Kansas at 19z with a large
area of convection blooming on either side of the front. Periods
of thunderstorms are expected through most of the period as upper
trough over the southern Rockies this afternoon lifts across the
plains region toward the upper Midwest through Saturday. There
looks to be a brief break in the stormy pattern late Saturday
night into Sunday behind the trough but additional storms return
by Monday.

Flash flood watch will cover parts of southeast Nebraska and
southwest Iowa near the warm front through tonight with potential
for several rounds of thunderstorms and heavy rain.

.LONG TERM...(Sunday night through Thursday)
Issued at 220 PM CDT Thu May 26 2016

Upper pattern becomes more amplified again in the extended period
with more storm chances into at least Wednesday although ECMWF is
a bit quicker with drier conditions by Tuesday night compared to
the GFS.

&&

.AVIATION...(18Z TAFS for KOMA...KLNK...KOFK through 18Z Friday)
Issued at 1250 PM CDT Thu May 26 2016

Showers and thunderstorms will begin to pop up across the region
this afTernoon. Storms could begin in KLNK as early at 19Z and
move into KOMA and KOFK later this afternoon and evening. Showers
and thunderstorms will continue well into the overnight hours
before clearing and potentially allowing light fog to develop
early Friday morning.

&&

.OAX Watches/Warnings/Advisories...
NE...Flash Flood Watch through Friday morning for NEZ066-068-078-
     088>093.

IA...Flash Flood Watch through Friday morning for IAZ090-091.

&&

SHORT TERM...Fobert
LONG TERM...Fobert
AVIATION...KG

Hazardous weather outlook, May 26, 11:59 AM CDT, 3 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1159 AM CDT THU MAY 26 2016

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-270700-
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-
1159 AM CDT THU MAY 26 2016

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS AN ENHANCED RISK OF SEVERE WEATHER TODAY AND TONIGHT ACROSS
MUCH OF THE REGION...ESPECIALLY ACROSS SOUTHERN NEBRASKA. A WARM
FRONT WILL LIFT NORTHWARD INTO THE AREA TODAY. THUNDERSTORMS ARE
EXPECTED TO DEVELOP ALONG THE FRONTAL BOUNDARY BEGINNING EARLY
THIS AFTERNOON...THEN LIFTING NORTH THROUGH THE AREA OVERNIGHT.
ALL MODES OF SEVERE WEATHER WILL BE POSSIBLE TODAY...INCLUDING
DAMAGING WINDS...VERY LARGE HAIL UP TO GOLF BALL SIZE OR
LARGER...AND EVEN TORNADOES IF STORMS ARE ABLE TO DEVELOP DIRECTLY
ON OR SOUTH OF THE WARM FRONT. SOME STORMS COULD PRODUCE VERY
HEAVY RAINFALL AS WELL...ESPECIALLY SOUTH OF INTERSTATE 80. STORM
CHANCES BEGIN TO DIMINISH AFTER MIDNIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THUNDERSTORM CHANCES REMAIN IN THE FORECAST JUST ABOUT EVERY DAY
THROUGH THE PERIOD.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED ACROSS PORTIONS OF THE
AREA TODAY AND TONIGHT.

In the hours before

Local storm report, May 26, 2:37 PM CDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
237 PM CDT THU MAY 26 2016

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

0234 PM     HAIL             2 E DENTON              40.74N 96.81W
05/26/2016  E1.00 INCH       LANCASTER          NE   STORM CHASER

            56TH STREET AND DENTON

&&

PEARSON

Local storm report, May 26, 3:01 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
301 PM CDT THU MAY 26 2016

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

0245 PM     HAIL             1 N FARRAGUT            40.73N 95.48W
05/26/2016  M1.00 INCH       FREMONT            IA   TRAINED SPOTTER

&&

JRB

Local storm report, May 26, 3:02 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
302 PM CDT THU MAY 26 2016

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

0302 PM     HAIL             7 S FRIEND              40.55N 97.28W
05/26/2016  E0.75 INCH       SALINE             NE   TRAINED SPOTTER

&&

PEARSON

Local storm report, May 26, 3:03 PM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
303 PM CDT THU MAY 26 2016

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

0303 PM     HAIL             NEBRASKA CITY           40.68N 95.86W
05/26/2016  E0.75 INCH       OTOE               NE   TRAINED SPOTTER

&&

PEARSON

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 8:13 PM CDT	Severe Thunderstorm Warning	OAX	Knox	32 min
May 25, 8:42 PM CDT	Severe Thunderstorm Warning	OAX	Knox	33 min
May 25, 9:10 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox	35 min
May 25, 9:36 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox	24 min
May 25, 9:54 PM CDT	Special Weather Statement	OAX	Pierce	36 min
May 25, 9:56 PM CDT	Severe Thunderstorm Warning	OAX	Cedar	34 min
May 25, 9:59 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox, Pierce	31 min
May 25, 10:27 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox, Pierce, Wayne	33 min
May 25, 10:42 PM CDT	Special Weather Statement	OAX	Lancaster	48 min
May 25, 10:44 PM CDT	Special Weather Statement	OAX	Richardson	31 min
May 25, 10:52 PM CDT	Special Weather Statement	OAX	Boone	38 min
May 25, 10:55 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Wayne	35 min
May 25, 11:18 PM CDT	Special Weather Statement	OAX	Boone	27 min
May 25, 11:27 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Wayne	33 min
May 25, 11:36 PM CDT	Special Weather Statement	OAX	Platte	39 min
May 25, 11:42 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Platte	33 min
May 25, 11:57 PM CDT	Severe Thunderstorm Warning	OAX	Wayne	33 min
May 26, 12:06 AM CDT	Special Weather Statement	OAX	Butler, Colfax, Dodge, Saunders, Seward	39 min
May 26, 12:12 AM CDT	Special Weather Statement	OAX	Stanton	33 min
May 26, 12:36 AM CDT	Special Weather Statement	OAX	Lancaster	24 min
May 26, 12:40 AM CDT	Special Weather Statement	OAX	Burt, Cuming, Dodge, Douglas, Sarpy, Washington	35 min
May 26, 12:49 AM CDT	Severe Thunderstorm Warning	OAX	Dodge, Douglas, Saunders, Washington	26 min
May 26, 12:54 AM CDT	Special Weather Statement	OAX	Thurston	51 min
May 26, 12:58 AM CDT	Severe Thunderstorm Warning	OAX	Burt, Dodge, Washington	32 min
May 26, 1:07 AM CDT	Severe Thunderstorm Warning	OAX	Douglas, Washington	23 min
May 26, 1:19 AM CDT	Severe Thunderstorm Warning	OAX	Burt	26 min
May 26, 1:22 AM CDT	Severe Thunderstorm Warning	OAX	Burt, Thurston	23 min
May 26, 1:22 PM CDT	Flash Flood Watch	OAX	Cass, Gage, Jefferson, Johnson, Lancaster, Nemaha and 4 more	14 hr
May 26, 1:50 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Saline	25 min
May 26, 2:14 PM CDT	Severe Thunderstorm Warning	OAX	Otoe	31 min
May 26, 2:15 PM CDT	Severe Thunderstorm Warning	OAX	Saline, Seward	30 min
May 26, 2:19 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Saline, Seward	26 min
May 26, 2:42 PM CDT	Severe Thunderstorm Warning	OAX	Saline, Seward	33 min
May 26, 3:09 PM CDT	Severe Thunderstorm Warning	OAX	Saline	36 min
May 26, 3:13 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Lancaster, Saline	32 min
May 26, 3:17 PM CDT	Flash Flood Warning	OAX	Saline, Seward	3 hr
May 26, 3:39 PM CDT	Tornado Warning	OAX	Gage, Lancaster	25 min
May 26, 3:42 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Saline	33 min
May 26, 3:50 PM CDT	Flash Flood Warning	OAX	Gage, Lancaster, Saline	3 hr
May 26, 3:50 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Otoe	25 min
May 26, 4:03 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Lancaster	27 min
May 26, 4:11 PM CDT	Flash Flood Warning	OAX	Cass, Otoe	3 hr
May 26, 4:27 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Otoe	33 min
May 26, 4:32 PM CDT	Special Weather Statement	OAX	Gage, Jefferson	43 min
May 26, 4:40 PM CDT	Tornado Warning	OAX	Johnson, Nemaha, Otoe	35 min
May 26, 4:45 PM CDT	Flash Flood Warning	OAX	Cass, Lancaster, Otoe	3 hr
May 26, 5:04 PM CDT	Flash Flood Warning	OAX	Otoe	3 hr
May 26, 5:10 PM CDT	Tornado Warning	OAX	Nemaha, Otoe	23 min

Nearby

Flash Flood Warnings in Nebraska, 2016 Every flash flood warning in 2016

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.