Alert archive / Nebraska / Tornado Warnings in 2018

Tornado Warning 13, NWS Omaha, NE

May 25, 2018Boone County, Nebraska

NWS Omaha, NE issued this tornado warning at May 25, 2018, 5:38 PM CDT for Boone County, Nebraska. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 25, 2018, 5:38 PM CDT (22:38 UTC)
Expired: May 25, 2018, 6:15 PM CDT
In force: 37 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Tornado: Observed
Hail: 0.75 in

County Boone County, NE

The radar

The Grand Island radar (KUEX), 158 km from the middle of the area, began a volume at 22:39 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.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.6 hours before the alert went out and 158 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: 502 J/kg
Mixed-layer CIN: -278 J/kg
Mixed-layer LCL: 1260 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

412 
WFUS53 KOAX 252238
TOROAX
NEC011-252315-
/O.NEW.KOAX.TO.W.0013.180525T2238Z-180525T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Omaha/Valley Nebraska
538 PM CDT FRI MAY 25 2018

The National Weather Service in Omaha has issued a

* Tornado Warning for...
  Southwestern Boone County in northeastern Nebraska...

* Until 615 PM CDT.

* At 538 PM CDT, a confirmed tornado was located 6 miles east of
  Spalding, or 36 miles east of Ord, moving southeast at 5 mph.

  HAZARD...Damaging tornado.

  SOURCE...Weather spotters confirmed tornado.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This tornadic thunderstorm will remain over mainly rural areas of
  southwestern Boone County, including the following locations...
  Loretto.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4183 9824 4176 9800 4153 9808 4169 9829
      4171 9829
TIME...MOT...LOC 2238Z 322DEG 6KT 4171 9824 

TORNADO...OBSERVED
HAIL...<.75IN

$$

FOBERT

1 follow-up statement

682 
WWUS53 KOAX 252307
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
607 PM CDT FRI MAY 25 2018

NEC011-252316-
/O.EXP.KOAX.TO.W.0013.000000T0000Z-180525T2315Z/
Boone NE-
607 PM CDT FRI MAY 25 2018

...THE TORNADO WARNING FOR SOUTHWESTERN BOONE COUNTY WILL EXPIRE AT
615 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.

No additional spotter reports have been received. Therefore, the 
warning will be allowed to expire.

LAT...LON 4183 9824 4176 9800 4153 9808 4169 9829
      4171 9829
TIME...MOT...LOC 2306Z 322DEG 6KT 4167 9820 

$$

FOBERT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 3:19 PM CDT	Special Weather Statement	OAX	Douglas	26 min
May 25, 3:26 PM CDT	Special Weather Statement	OAX	Washington	34 min
May 25, 3:35 PM CDT	Severe Thunderstorm Warning	OAX	Washington	25 min
May 25, 3:58 PM CDT	Special Weather Statement	OAX	Washington	32 min
May 25, 4:25 PM CDT	Special Weather Statement	OAX	Boone	50 min
May 25, 4:30 PM CDT	Special Weather Statement	OAX	Washington	45 min
May 25, 4:56 PM CDT	Special Weather Statement	OAX	Colfax	49 min
May 25, 5:26 PM CDT	Special Weather Statement	OAX	Boone	49 min
May 25, 6:10 PM CDT	Special Weather Statement	OAX	Colfax	50 min
May 25, 6:53 PM CDT	Special Weather Statement	OAX	Colfax	52 min

Nearby

Tornado Warnings in Nebraska, 2018 Every tornado warning in 2018 Tornadoes in 2018

Sources

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