Alert archive / Indiana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 9, NWS Northern Indiana

April 11, 20116 counties in Indiana

NWS Northern Indiana issued this severe thunderstorm warning at Apr 11, 2011, 1:29 AM EDT for 6 counties in Indiana. It was in force for 46 min. 2 reports 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 11, 2011, 1:29 AM EDT (05:29 UTC)
Expired: Apr 11, 2011, 2:15 AM EDT
In force: 46 min
Issued by: NWS Northern Indiana
Area: Storm-based polygon
Hail: 0.5 in
Wind: 60.0 mph

Counties Fulton County, IN, LaPorte County, IN, Marshall County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN

The radar

The Northern Indiana radar (KIWX), 79 km from the middle of the area, began a volume at 05:31 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 11, 1:45 AM EDT	TSTM WND DMG	1 N Ober, IN	TREE DOWN ON SR 23 AND E 150S. TIME ESTIMATED
Apr 11, 2:05 AM EDT	TSTM WND DMG	Plymouth, IN	TREE DOWN ON 1600 BLOCK OF 9TH ST. TIME ESTIMATED FROM RADAR

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

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 5.5 hours before the alert went out and 207 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: 1523 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1493 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 6.7

Open this sounding in Storm Lab

The text

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

130 
WUUS53 KIWX 110529
SVRIWX
INC049-091-099-131-141-149-110615-
/O.NEW.KIWX.SV.W.0009.110411T0529Z-110411T0615Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTHERN INDIANA
129 AM EDT MON APR 11 2011

THE NATIONAL WEATHER SERVICE IN NORTHERN INDIANA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  PULASKI COUNTY IN NORTHWEST INDIANA...
  MARSHALL COUNTY IN NORTH CENTRAL INDIANA...
  SOUTHERN LA PORTE COUNTY IN NORTHWEST INDIANA...
  SOUTHWESTERN ST. JOSEPH COUNTY IN NORTH CENTRAL INDIANA...
  NORTHWESTERN FULTON COUNTY IN NORTH CENTRAL INDIANA...
  STARKE COUNTY IN NORTHWEST INDIANA...

* UNTIL 215 AM EDT/115 AM CDT/

* AT 1227 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE SEVERE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 5 MILES SOUTHWEST OF LA CROSSE TO 6 MILES NORTHWEST
  OF MEDARYVILLE TO 13 MILES WEST OF FRANCESVILLE...AND MOVING EAST
  AT 65 MPH.

* LOCATIONS IN THE PATH OF SEVERE THUNDERSTORMS INCLUDE...
  NORTH JUDSON...
  MEDARYVILLE AND FRANCESVILLE...
  HAMLET AND KNOX...
  KOONTZ LAKE...
  WALKERTON AND WINAMAC...
  PLYMOUTH AND CULVER...

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
THOMASTON...CLARKS...ENGLISH LAKE...HANNA...BREMS...TOTO...DENHAM...
GROVERTOWN...RIPLEY...WINONA...OBER AND OAK GROVE.

PRECAUTIONARY/PREPARDNESS ACTIONS...

THIS IS A DANGEROUS LINE OF SEVERE THUNDERSTORMS. IF YOU ARE IN THE
PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS IN EXCESS OF 60 MPH...
ALONG WITH DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD
MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM
WINDOWS.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN NORTHERN INDIANA.

&&

LAT...LON 4137 8694 4158 8619 4108 8617 4095 8694
TIME...MOT...LOC 0528Z 251DEG 55KT 4127 8693 4115 8696
          4101 8711
WIND...HAIL 60MPH <.50IN

$$

2 follow-up statements

960 
WWUS53 KIWX 110600
SVSIWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
200 AM EDT MON APR 11 2011

INC049-091-099-131-141-149-110615-
/O.CON.KIWX.SV.W.0009.000000T0000Z-110411T0615Z/
STARKE IN-FULTON IN-ST. JOSEPH IN-LA PORTE IN-MARSHALL IN-PULASKI IN-
200 AM EDT MON APR 11 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 AM
EDT/115 AM CDT/ FOR MARSHALL...SOUTHWESTERN ST. JOSEPH AND
NORTHWESTERN FULTON COUNTIES IN NORTH CENTRAL INDIANA...AND
NORTHEASTERN PULASKI...SOUTHERN LA PORTE AND STARKE COUNTIES IN
NORTHWEST INDIANA...

AT 159 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH. THESE SEVERE STORMS WERE LOCATED ALONG A
LINE EXTENDING FROM 6 MILES NORTHEAST OF PLYMOUTH TO PLYMOUTH TO 3
MILES SOUTH OF CULVER...AND MOVING EAST AT 65 MPH.

LOCATIONS IMPACTED INCLUDE...
  ARGOS...INWOOD...TIOSA AND WALNUT.

PRECAUTIONARY/PREPARDNESS ACTIONS...

THIS IS A DANGEROUS LINE OF SEVERE THUNDERSTORMS. IF YOU ARE IN THE
PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS IN EXCESS OF 60 MPH...
ALONG WITH DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD
MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM
WINDOWS.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN NORTHERN INDIANA.

&&

LAT...LON 4113 8675 4138 8689 4158 8619 4115 8617
TIME...MOT...LOC 0601Z 248DEG 62KT 4145 8622 4133 8625
          4119 8640
WIND...HAIL 60MPH <.50IN

$$

659 
WWUS53 KIWX 110610
SVSIWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
210 AM EDT MON APR 11 2011

INC049-091-099-131-141-149-110620-
/O.EXP.KIWX.SV.W.0009.000000T0000Z-110411T0615Z/
STARKE IN-FULTON IN-ST. JOSEPH IN-LA PORTE IN-MARSHALL IN-PULASKI IN-
210 AM EDT MON APR 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR MARSHALL...SOUTHERN ST. JOSEPH
AND NORTHWESTERN FULTON COUNTIES IN NORTH CENTRAL INDIANA...AND
NORTHEASTERN PULASKI...SOUTHERN LA PORTE AND STARKE COUNTIES IN
NORTHWEST INDIANA WILL EXPIRE AT 215 AM EDT/115 AM CDT/...

AT 210 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT
THE LINE OF SEVERE THUNDERSTORMS WHICH PROMPTED THE WARNING HAD 
WEAKENED AND WAS MOVING OUT OF THE AREA. THEREFORE...THE SEVERE 
THUNDERSTORM WARNING HAS BEEN ALLOWED TO EXPIRE AT 215 AM EDT.

PRECAUTIONARY/PREPARDNESS ACTIONS...

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN NORTHERN INDIANA.

&&

LAT...LON 4113 8675 4138 8689 4158 8619 4115 8617
TIME...MOT...LOC 0610Z 248DEG 62KT 4151 8603 4139 8606
          4125 8621

$$

The office that day

Everything else NWS Northern Indiana issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 11, 1:01 AM EDT	Special Weather Statement	IWX	LaPorte, Saint Joseph	29 min
Apr 11, 1:15 AM EDT	Special Weather Statement	IWX	Marshall, Pulaski, Starke	60 min
Apr 11, 1:59 AM EDT	Special Weather Statement	IWX	Elkhart, Kosciusko	46 min
Apr 11, 2:05 AM EDT	Special Weather Statement	IWX	Elkhart, Kosciusko	40 min
Apr 11, 2:17 AM EDT	Severe Thunderstorm Warning	IWX	Cass, Fulton, Marshall, Pulaski, Starke, White	58 min
Apr 11, 2:30 AM EDT	Special Weather Statement	IWX	LaGrange, Steuben	45 min
Apr 11, 2:55 AM EDT	Special Weather Statement	IWX	Kosciusko	35 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2011 Every severe thunderstorm warning in 2011

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.