Alert archive / Nebraska / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 252, NWS Omaha, NE

July 22, 2011Johnson County, Nemaha County, Pawnee County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Jul 22, 2011, 4:30 PM CDT for Johnson County, Nemaha County, Pawnee County, Nebraska. It was in force for 60 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: Jul 22, 2011, 4:30 PM CDT (21:30 UTC)
Expired: Jul 22, 2011, 5:30 PM CDT
In force: 60 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Johnson County, NE, Nemaha County, NE, Pawnee County, NE

The radar

The Omaha radar (KOAX), 126 km from the middle of the area, began a volume at 21:29 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
Jul 22, 4:55 PM CDT	HAIL 1	4 Ene Steinauer, NE	ALSO WINDS ESTIMATED NEAR 60 MPH.
Jul 22, 4:55 PM CDT	HAIL 1	Steinauer, NE	ALSO WINDS ESTIMATED NEAR 60 MPH.
Jul 22, 5:05 PM CDT	TSTM WND GST 52	Table Rock, NE

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

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.5 hours before the alert went out and 126 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: 485 J/kg
Mixed-layer CIN: -327 J/kg
Mixed-layer LCL: 1875 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: -46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

153 
WUUS53 KOAX 222130
SVROAX
NEC097-127-133-222230-
/O.NEW.KOAX.SV.W.0252.110722T2130Z-110722T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
430 PM CDT FRI JUL 22 2011

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN JOHNSON COUNTY IN SOUTHEAST NEBRASKA...
  SOUTHWESTERN NEMAHA COUNTY IN SOUTHEAST NEBRASKA...
  PAWNEE COUNTY IN SOUTHEAST NEBRASKA...

* UNTIL 530 PM CDT

* AT 425 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS OF AROUND
  60 MPH OR HIGHER.  THIS STORM WAS LOCATED NEAR PAWNEE CITY...OR 31
  MILES SOUTHEAST OF BEATRICE...AND MOVING NORTHEAST AT 15 MPH. PENNY
  SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...
  PAWNEE CITY...TABLE ROCK...TECUMSEH...STEINAUER...ELK CREEK AND 8
  MILES SOUTH OF JOHNSON.

THE WARNED AREA INCLUDES HIGHWAY 136 IN NEBRASKA BETWEEN MILE MARKERS
207 AND 218.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND 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 LEVEL OF YOUR
HOME OR BUSINESS. HEAVY RAIN CAN QUICKLY FLOOD ROADS...SO DO NOT
DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4005 9639 4036 9636 4043 9623 4036 9593
      4026 9599 4026 9601 4023 9601 4000 9615
      4000 9628
TIME...MOT...LOC 2130Z 206DEG 15KT 4010 9620
WIND...HAIL 60MPH 0.75IN

$$

PEARSON

3 follow-up statements

534 
WWUS53 KOAX 222145
SVSOAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
445 PM CDT FRI JUL 22 2011

NEC097-127-133-222230-
/O.CON.KOAX.SV.W.0252.000000T0000Z-110722T2230Z/
JOHNSON NE-NEMAHA NE-PAWNEE NE-
445 PM CDT FRI JUL 22 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
PAWNEE...SOUTHWESTERN NEMAHA AND SOUTHEASTERN JOHNSON COUNTIES UNTIL
530 PM CDT...

AT 439 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR PAWNEE CITY...OR 31 MILES WEST OF FALLS CITY...MOVING
NORTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  TABLE ROCK...TECUMSEH...STEINAUER...ELK CREEK AND 8 MILES SOUTH OF
  JOHNSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND 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 LEVEL OF YOUR
HOME OR BUSINESS. HEAVY RAIN CAN FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4011 9628 4017 9631 4034 9626 4042 9617
      4036 9593 4026 9599 4026 9601 4023 9601
      4010 9612
TIME...MOT...LOC 2144Z 206DEG 15KT 4015 9617
WIND...HAIL 60MPH 1.00IN

$$

PEARSON

823 
WWUS53 KOAX 222159
SVSOAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
459 PM CDT FRI JUL 22 2011

NEC097-127-133-222230-
/O.CON.KOAX.SV.W.0252.000000T0000Z-110722T2230Z/
JOHNSON NE-NEMAHA NE-PAWNEE NE-
459 PM CDT FRI JUL 22 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
PAWNEE...SOUTHWESTERN NEMAHA AND SOUTHEASTERN JOHNSON COUNTIES UNTIL
530 PM CDT...

AT 453 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR TABLE ROCK...OR 30 MILES WEST OF FALLS CITY...MOVING
NORTHEAST AT 15 MPH.

IN ADDITION...AT 455 PM QUARTER SIZE HAIL WAS REPORTED NEAR 
STEINAUER WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  TECUMSEH...ELK CREEK AND 8 MILES SOUTH OF JOHNSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE MAIN THREAT IS HAIL ONE INCH IN DIAMETER OR LARGER. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST LEVEL OF YOUR HOME
OR BUSINESS. SEVERE THUNDERSTORMS CAN ALSO PRODUCE DAMAGING WINDS IN
EXCESS OF 60 MILES PER HOUR...DEADLY LIGHTNING AND VERY HEAVY RAIN.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4012 9613 4016 9621 4021 9628 4034 9625
      4041 9618 4042 9617 4036 9593 4026 9599
      4026 9601 4023 9601 4013 9610
TIME...MOT...LOC 2158Z 206DEG 15KT 4020 9613
WIND...HAIL 60MPH 1.00IN

$$

PEARSON

639 
WWUS53 KOAX 222211
SVSOAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
511 PM CDT FRI JUL 22 2011

NEC097-127-133-222230-
/O.CON.KOAX.SV.W.0252.000000T0000Z-110722T2230Z/
JOHNSON NE-NEMAHA NE-PAWNEE NE-
511 PM CDT FRI JUL 22 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
PAWNEE...SOUTHWESTERN NEMAHA AND SOUTHEASTERN JOHNSON COUNTIES UNTIL
530 PM CDT...

AT 507 PM CDT...A SEVERE THUNDERSTORM WAS REPORTED...PRODUCING 
QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS
STORM WAS LOCATED NEAR TABLE ROCK...OR 30 MILES NORTHWEST OF FALLS 
CITY...MOVING NORTHEAST AT 15 MPH. AT 455 PM...QUARTER SIZE HAIL WAS 
REPORTED NEAR STEINAUER ALONG WITH 60 MPH WINDS.

LOCATIONS IMPACTED INCLUDE...
  TECUMSEH...ELK CREEK AND 8 MILES SOUTH OF JOHNSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST LEVEL OF
YOUR HOME OR BUSINESS. STAY AWAY FROM WINDOWS AND GLASS DOORS. SEVERE
THUNDERSTORMS CAN PRODUCE LARGE HAIL...DAMAGING WINDS...FREQUENT
LIGHTNING AND VERY HEAVY RAIN.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4012 9613 4016 9621 4021 9628 4034 9625
      4041 9618 4042 9617 4036 9593 4026 9599
      4026 9601 4023 9601 4013 9610
TIME...MOT...LOC 2211Z 206DEG 15KT 4025 9610
WIND...HAIL 60MPH 1.00IN

$$

PEARSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 4:29 AM CDT	Heat Advisory	OAX	Cass, Douglas, Gage, Jefferson, Johnson, Lancaster and 6 more	15 hr
Jul 22, 3:31 PM CDT	Heat Advisory	OAX	Antelope, Boone, Burt, Butler, Cass, Cedar and 24 more	28 hr
Jul 22, 4:07 PM CDT	Severe Thunderstorm Warning	OAX	Nemaha, Richardson	23 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2011 Every severe thunderstorm warning in 2011

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.