Alert archive / Indiana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 521, NWS Louisville, KY

September 7, 20124 counties in Indiana

NWS Louisville, KY issued this severe thunderstorm warning at Sep 7, 2012, 11:06 PM EDT for 4 counties in Indiana. It was in force for 29 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: Sep 7, 2012, 11:06 PM EDT (03:06 UTC)
Expired: Sep 7, 2012, 11:35 PM EDT
In force: 29 min
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Hail: 0.5 in
Wind: 60.0 mph

Counties Clark County, IN, Floyd County, IN, Harrison County, IN, Washington County, IN

The radar

The Louisville radar (KLVX), 52 km from the middle of the area, began a volume at 03:05 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
Sep 7, 11:30 PM EDT	TSTM WND DMG	2 N Sellersburg, IN	BRANCHES AND SMALL TREES DOWN BETWEEN SELLERSBURG AND MEMPHIS

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Sep 7, 9:10 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 3.1 hours before the alert went out and 201 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: 531 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 1512 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 195 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

103 
WUUS53 KLMK 080306
SVRLMK
INC019-043-061-175-080335-
/O.NEW.KLMK.SV.W.0521.120908T0306Z-120908T0335Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LOUISVILLE KY
1106 PM EDT FRI SEP 7 2012

THE NATIONAL WEATHER SERVICE IN LOUISVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLARK COUNTY IN SOUTH CENTRAL INDIANA...
  FLOYD COUNTY IN SOUTH CENTRAL INDIANA...
  NORTHERN HARRISON COUNTY IN SOUTH CENTRAL INDIANA...
  SOUTHEASTERN WASHINGTON COUNTY IN SOUTH CENTRAL INDIANA...

* UNTIL 1135 PM EDT

* AT 1101 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM DAISY HILL TO 15 MILES WEST OF CORYDON...MOVING EAST-SOUTHEAST
  AT 45 MPH.

* SEVERE THUNDERSTORMS WILL ALSO IMPACT...
  NEW ALBANY...
  CORYDON...
  BLUE LICK AND HENRYVILLE...
  MEMPHIS AND GEORGETOWN...
  CHARLESTOWN AND CLARK SIDING...
  ROLLING HILLS AND VESTA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT...POST YOUR REPORT TO
THE NATIONAL WEATHER SERVICE LOUISVILLE FACEBOOK PAGE...OR TWEET YOUR
REPORT USING HASHTAG L...M...K...SPOTTER.

&&

LAT...LON 3856 8541 3846 8553 3845 8558 3843 8562
      3836 8564 3830 8570 3827 8575 3829 8578
      3828 8583 3823 8585 3818 8591 3820 8621
      3857 8589 3856 8583 3858 8581 3859 8543
TIME...MOT...LOC 0306Z 286DEG 37KT 3850 8594 3822 8632
WIND...HAIL 60MPH <.50IN

$$

TWF

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 8:30 PM EDT	Special Weather Statement	LMK	Dubois, Orange, Washington	90 min
Sep 7, 9:50 PM EDT	Severe Thunderstorm Warning	LMK	Orange, Washington	45 min
Sep 7, 9:56 PM EDT	Special Weather Statement	LMK	Perry	54 min
Sep 7, 10:09 PM EDT	Special Weather Statement	LMK	Crawford, Dubois, Orange	56 min
Sep 7, 10:13 PM EDT	Severe Thunderstorm Warning	LMK	Dubois, Orange	32 min
Sep 7, 10:36 PM EDT	Severe Thunderstorm Warning	LMK	Perry	29 min
Sep 7, 10:40 PM EDT	Severe Thunderstorm Warning	LMK	Clark, Crawford, Dubois, Harrison, Orange, Perry and 2 more	40 min
Sep 7, 10:52 PM EDT	Severe Thunderstorm Warning	LMK	Perry	43 min
Sep 7, 10:54 PM EDT	Special Weather Statement	LMK	Harrison	31 min
Sep 7, 11:00 PM EDT	Severe Thunderstorm Warning	LMK	Crawford, Harrison, Perry	40 min
Sep 7, 11:10 PM EDT	Severe Thunderstorm Warning	LMK	Jefferson, Scott	40 min
Sep 7, 11:23 PM EDT	Special Weather Statement	LMK	Crawford	32 min
Sep 7, 11:24 PM EDT	Severe Thunderstorm Warning	LMK	Clark, Floyd, Harrison	46 min
Sep 7, 11:26 PM EDT	Severe Thunderstorm Warning	LMK	Harrison	29 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2012 Every severe thunderstorm warning in 2012

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.