Alert archive / Nebraska / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 21, NWS Omaha, NE

April 9, 2013Douglas County, Washington County, Nebraska; Harrison County, Pottawattamie County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Apr 9, 2013, 8:30 PM CDT for Douglas County, Washington County, Nebraska; Harrison County, Pottawattamie County, Iowa. It was in force for 30 min. 1 report 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 9, 2013, 8:30 PM CDT (01:30 UTC)
Expired: Apr 9, 2013, 9:00 PM CDT
In force: 30 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.75 in
Wind: 50.0 mph

Counties Harrison County, IA, Pottawattamie County, IA, Douglas County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 40 km from the middle of the area, began a volume at 01:31 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 9, 8:43 PM CDT	HAIL 1.75	Fort Calhoun, 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 00:00Z, 1.5 hours before the alert went out and 40 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: 460 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 469 m²/s²
0-3 km storm-relative helicity: 702 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

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

794 
WUUS53 KOAX 100130
SVROAX
IAC085-155-NEC055-177-100200-
/O.NEW.KOAX.SV.W.0021.130410T0130Z-130410T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
830 PM CDT TUE APR 9 2013

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHEASTERN DOUGLAS COUNTY IN EAST CENTRAL NEBRASKA...
  SOUTHWESTERN HARRISON COUNTY IN SOUTHWEST IOWA...
  EXTREME NORTHWESTERN POTTAWATTAMIE COUNTY IN SOUTHWEST IOWA...
  SOUTHEASTERN WASHINGTON COUNTY IN EAST CENTRAL NEBRASKA...

* UNTIL 900 PM CDT

* AT 826 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER OMAHA... 
  MOVING NORTH AT 50 MPH.

HAZARD...GOLF BALL SIZE HAIL.

SOURCE...TRAINED WEATHER SPOTTERS.

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT DAMAGE 
TO ROOFS...SIDING...WINDOWS...VEHICLES AND CROPS.

* LOCATIONS IMPACTED INCLUDE...
  BLAIR...MISSOURI VALLEY...FORT CALHOUN AND MODALE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4139 9594 4139 9620 4167 9610 4170 9594
      4167 9581
TIME...MOT...LOC 0130Z 198DEG 44KT 4132 9609 

HAIL...1.75IN
WIND...<50MPH

$$

DEWALD

2 follow-up statements

033 
WWUS53 KOAX 100145
SVSOAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
845 PM CDT TUE APR 9 2013

IAC085-155-NEC055-177-100200-
/O.CON.KOAX.SV.W.0021.000000T0000Z-130410T0200Z/
POTTAWATTAMIE IA-HARRISON IA-WASHINGTON NE-DOUGLAS NE-
845 PM CDT TUE APR 9 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT 
FOR EXTREME NORTHWESTERN POTTAWATTAMIE...SOUTHWESTERN HARRISON...
SOUTHEASTERN WASHINGTON AND EXTREME NORTHEASTERN DOUGLAS COUNTIES...

AT 840 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR FORT 
CALHOUN...OR 16 MILES NORTH OF OMAHA...MOVING NORTH AT 50 MPH.

HAZARD...GOLF BALL SIZE HAIL.

SOURCE...LAW ENFORCEMENT.

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT DAMAGE 
TO ROOFS...SIDING...WINDOWS...VEHICLES AND CROPS.

LOCATIONS IMPACTED INCLUDE...
MISSOURI VALLEY...FORT CALHOUN AND MODALE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4139 9594 4142 9614 4167 9610 4170 9594
      4167 9581
TIME...MOT...LOC 0130Z 198DEG 45KT 4150 9600 

HAIL...1.75IN
WIND...<50MPH

$$

DEWALD

319 
WWUS53 KOAX 100154
SVSOAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
854 PM CDT TUE APR 9 2013

IAC155-NEC055-177-100203-
/O.CAN.KOAX.SV.W.0021.000000T0000Z-130410T0200Z/
POTTAWATTAMIE IA-WASHINGTON NE-DOUGLAS NE-
854 PM CDT TUE APR 9 2013

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME NORTHWESTERN 
POTTAWATTAMIE...SOUTHEASTERN WASHINGTON AND EXTREME NORTHEASTERN 
DOUGLAS COUNTIES IS CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF 
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED. THIS 
STORM DID PRODUCE A LARGE SWATH OF GOLF BALL SIZE HAIL. 

LAT...LON 4153 9589 4156 9607 4164 9606 4170 9594
      4167 9581
TIME...MOT...LOC 0130Z 204DEG 51KT 4164 9591 

$$

IAC085-100200-
/O.CON.KOAX.SV.W.0021.000000T0000Z-130410T0200Z/
HARRISON IA-
854 PM CDT TUE APR 9 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT 
FOR SOUTHWESTERN HARRISON COUNTY...

AT 850 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR MODALE...OR 
26 MILES NORTH OF OMAHA...MOVING NORTHEAST AT 60 MPH.

HAZARD...GOLF BALL SIZE HAIL.

SOURCE...LAW ENFORCEMENT.

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT DAMAGE 
TO ROOFS...SIDING...WINDOWS...VEHICLES AND CROPS.

LOCATIONS IMPACTED INCLUDE...
MISSOURI VALLEY AND MODALE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4153 9589 4156 9607 4164 9606 4170 9594
      4167 9581
TIME...MOT...LOC 0130Z 204DEG 51KT 4164 9591 

HAIL...1.75IN
WIND...<50MPH

$$

DEWALD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 7:11 PM CDT	Severe Thunderstorm Warning	OAX	Nemaha	34 min
Apr 9, 7:29 PM CDT	Special Weather Statement	OAX	Stanton, Wayne	31 min
Apr 9, 7:33 PM CDT	Special Weather Statement	OAX	Thurston	27 min
Apr 9, 7:51 PM CDT	Special Weather Statement	OAX	Douglas	24 min
Apr 9, 7:55 PM CDT	Special Weather Statement	OAX	Cass	35 min
Apr 9, 8:04 PM CDT	Special Weather Statement	OAX	Cuming	26 min
Apr 9, 8:06 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Sarpy	24 min
Apr 9, 8:13 PM CDT	Special Weather Statement	OAX	Burt	32 min
Apr 9, 8:16 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy	29 min
Apr 9, 8:34 PM CDT	Special Weather Statement	OAX	Washington	26 min
Apr 9, 8:53 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy	37 min
Apr 9, 9:32 PM CDT	Areal Flood Advisory	OAX	Burt, Dodge, Douglas, Lancaster, Saunders, Seward and 1 more	118 min
Apr 9, 10:01 PM CDT	Special Weather Statement	OAX	Cass, Douglas, Gage, Lancaster, Sarpy, Washington	59 min
Apr 9, 11:22 PM CDT	Special Weather Statement	OAX	Johnson, Nemaha, Otoe, Pawnee	53 min
Apr 9, 8:52 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Monona	23 min
Apr 9, 9:15 PM CDT	Special Weather Statement	OAX	Monona	15 min
Apr 10, 12:16 AM CDT	Special Weather Statement	OAX	Fremont, Mills, Montgomery, Page, Pottawattamie	44 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2013 Severe Thunderstorm Warnings in Iowa, 2013 Every severe thunderstorm warning in 2013

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.