Alert archive / Indiana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 187, NWS Indianapolis, IN

July 31, 2012Daviess County, Knox County, Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at Jul 31, 2012, 6:45 PM EDT for Daviess County, Knox County, Indiana. It was in force for 16 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 31, 2012, 6:45 PM EDT (22:45 UTC)
Expired: Jul 31, 2012, 7:01 PM EDT
In force: 16 min
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Daviess County, IN, Knox County, IN

The radar

The Evansville,IN radar (KVWX), 51 km from the middle of the area, began a volume at 22:44 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.

Issued	Product	Office	Lasted
Jul 31, 2:13 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.8 hours before the alert went out and 213 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: 2241 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 958 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

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

955 
WUUS53 KIND 312245
SVRIND
INC027-083-312315-
/O.NEW.KIND.SV.W.0187.120731T2245Z-120731T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
645 PM EDT TUE JUL 31 2012

THE NATIONAL WEATHER SERVICE IN INDIANAPOLIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN DAVIESS COUNTY IN SOUTHWEST INDIANA...
  CENTRAL KNOX COUNTY IN SOUTHWEST INDIANA...

* UNTIL 715 PM EDT

* AT 641 PM EDT...EMERGENCY MANAGEMENT REPORTED A SEVERE THUNDERSTORM
  PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60
  MPH.  THIS STORM WAS LOCATED 7 MILES NORTH OF PETERSBURG...AND
  MOVING SOUTHEAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EXTREME SOUTHWESTERN DAVIESS AND SOUTHEASTERN
  KNOX COUNTIES.

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 FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3853 8710 3851 8715 3855 8719 3853 8722
      3854 8725 3850 8730 3854 8735 3851 8737
      3854 8740 3852 8741 3853 8744 3856 8747
      3870 8732 3851 8704 3850 8706
TIME...MOT...LOC 2245Z 311DEG 22KT 3857 8730
WIND...HAIL 60MPH 1.00IN

$$

NIELD

1 follow-up statement

854 
WWUS53 KIND 312301
SVSIND

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
701 PM EDT TUE JUL 31 2012

INC027-083-312311-
/O.CAN.KIND.SV.W.0187.000000T0000Z-120731T2315Z/
DAVIESS-KNOX-
701 PM EDT TUE JUL 31 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN DAVIESS AND
CENTRAL KNOX COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT.

LAT...LON 3853 8710 3851 8715 3855 8719 3853 8722
      3854 8725 3850 8730 3854 8735 3851 8737
      3854 8740 3852 8741 3853 8744 3856 8747
      3870 8732 3851 8704 3850 8706
TIME...MOT...LOC 2301Z 311DEG 22KT 3851 8721

$$

NIELD

The office that day

Everything else NWS Indianapolis, IN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 31, 4:19 PM EDT	Special Weather Statement	IND	Tippecanoe	26 min
Jul 31, 4:23 PM EDT	Special Weather Statement	IND	Clay, Greene, Owen	52 min
Jul 31, 4:35 PM EDT	Severe Thunderstorm Warning	IND	Daviess, Greene, Lawrence, Martin, Monroe, Owen	40 min
Jul 31, 4:56 PM EDT	Special Weather Statement	IND	Hamilton, Marion	49 min
Jul 31, 5:14 PM EDT	Severe Thunderstorm Warning	IND	Daviess, Greene, Martin	31 min
Jul 31, 5:50 PM EDT	Severe Thunderstorm Warning	IND	Daviess	25 min
Jul 31, 6:13 PM EDT	Severe Thunderstorm Warning	IND	Daviess, Knox	32 min
Jul 31, 7:10 PM EDT	Severe Thunderstorm Warning	IND	Bartholomew, Brown, Johnson, Shelby	50 min
Jul 31, 7:34 PM EDT	Severe Thunderstorm Warning	IND	Bartholomew, Decatur	41 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.