Alert archive / Indiana / Tornado Warnings in 2018

Tornado Warning 25, NWS Louisville, KY

July 20, 2018Jefferson County, Indiana

NWS Louisville, KY issued this tornado warning at Jul 20, 2018, 2:46 PM EDT for Jefferson County, Indiana. It was in force for 29 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
Jul 20, 2018, 2:46 PM EDT (18:46 UTC)
Expired
Jul 20, 2018, 3:15 PM EDT
In force
29 min
Issued by
NWS Louisville, KY
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.75 in

County Jefferson County, IN

The radar

The Louisville radar (KLVX), 103 km from the middle of the area, began a volume at 18:44 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 20, 1:37 PM EDTTornado WatchSPC7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 6.8 hours before the alert went out and 304 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2018-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 265 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2018-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 273 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
265 J/kg
Mixed-layer CIN
-249 J/kg
Mixed-layer LCL
1579 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
273 m²/s²
0-3 km storm-relative helicity
343 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

267 
WFUS53 KLMK 201846
TORLMK
INC077-201915-
/O.NEW.KLMK.TO.W.0025.180720T1846Z-180720T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Louisville KY
246 PM EDT FRI JUL 20 2018

The National Weather Service in Louisville has issued a

* Tornado Warning for...
  Northern Jefferson County in south central Indiana...

* Until 315 PM EDT.
    
* At 246 PM EDT, a severe thunderstorm capable of producing a tornado
  was located 10 miles south of Vernon, moving east at 20 mph.

  HAZARD...Tornado and golf ball size hail.

  SOURCE...Radar indicated rotation.

  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.

* Locations impacted include...
  Middlefork, Belleview, Five Points, Wirt and China. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3879 8530 3880 8562 3882 8562 3883 8561
      3885 8561 3885 8557 3887 8557 3887 8530
TIME...MOT...LOC 1846Z 268DEG 17KT 3883 8561 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$
JDG
1 follow-up statement
619 
WWUS53 KLMK 201900
SVSLMK

Severe Weather Statement
National Weather Service Louisville KY
300 PM EDT FRI JUL 20 2018

INC077-201915-
/O.CON.KLMK.TO.W.0025.000000T0000Z-180720T1915Z/
Jefferson IN-
300 PM EDT FRI JUL 20 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 PM EDT FOR
NORTHEASTERN JEFFERSON COUNTY...
    
At 259 PM EDT, a severe thunderstorm capable of producing a tornado
was located 8 miles northwest of Madison, moving east at 25 mph.

HAZARD...Tornado and golf ball size hail.

SOURCE...Radar indicated rotation.

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.

Locations impacted include...
Middlefork, Belleview, Five Points, Wirt and China. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3880 8554 3887 8554 3887 8530 3879 8530
TIME...MOT...LOC 1859Z 265DEG 20KT 3884 8547 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$
JDG

The office that day

Everything else NWS Louisville, KY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 20, 4:31 AM EDTSpecial Weather StatementLMKCrawford, Orange, Perry29 min
Jul 20, 5:25 AM EDTSpecial Weather StatementLMKHarrison35 min
Jul 20, 10:50 AM EDTSpecial Weather StatementLMKCrawford40 min
Jul 20, 11:18 AM EDTSpecial Weather StatementLMKOrange27 min
Jul 20, 12:54 PM EDTSevere Thunderstorm WarningLMKCrawford, Harrison, Perry51 min
Jul 20, 1:33 PM EDTSpecial Weather StatementLMKFloyd27 min
Jul 20, 1:40 PM EDTSevere Thunderstorm WarningLMKFloyd, Harrison50 min
Jul 20, 1:44 PM EDTSevere Thunderstorm WarningLMKFloyd, Harrison, Washington31 min
Jul 20, 1:51 PM EDTSpecial Weather StatementLMKScott, Washington39 min
Jul 20, 1:53 PM EDTSevere Thunderstorm WarningLMKClark, Jefferson, Scott37 min
Jul 20, 2:00 PM EDTTornado WarningLMKHarrison45 min
Jul 20, 2:08 PM EDTSevere Thunderstorm WarningLMKWashington37 min
Jul 20, 2:18 PM EDTSpecial Weather StatementLMKClark27 min
Jul 20, 2:20 PM EDTSevere Thunderstorm WarningLMKFloyd70 min
Jul 20, 2:20 PM EDTTornado WarningLMKJefferson25 min
Jul 20, 2:21 PM EDTSevere Thunderstorm WarningLMKHarrison24 min
Jul 20, 2:24 PM EDTSevere Thunderstorm WarningLMKScott, Washington36 min
Jul 20, 2:28 PM EDTSevere Thunderstorm WarningLMKFloyd, Harrison16 min
Jul 20, 2:28 PM EDTSevere Thunderstorm WarningLMKClark, Scott, Washington32 min
Jul 20, 2:32 PM EDTSevere Thunderstorm WarningLMKJefferson28 min
Jul 20, 2:44 PM EDTSevere Thunderstorm WarningLMKHarrison34 min
Jul 20, 2:49 PM EDTSevere Thunderstorm WarningLMKJefferson26 min
Jul 20, 3:02 PM EDTSpecial Weather StatementLMKJefferson28 min
Jul 20, 3:14 PM EDTSevere Thunderstorm WarningLMKJefferson16 min
Jul 20, 6:53 PM EDTSevere Thunderstorm WarningLMKJefferson, Scott37 min
Jul 20, 7:08 PM EDTSevere Thunderstorm WarningLMKJefferson37 min
Jul 20, 7:18 PM EDTSevere Thunderstorm WarningLMKClark27 min
Jul 20, 7:45 PM EDTSevere Thunderstorm WarningLMKClark15 min
Jul 20, 7:54 PM EDTSevere Thunderstorm WarningLMKCrawford, Perry23 min

Nearby

Tornado Warnings in Indiana, 2018Every tornado warning in 2018Tornadoes 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.