Alert archive / Indiana / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 113, NWS Northern Indiana

August 3, 2017LaPorte County, Indiana

NWS Northern Indiana issued this severe thunderstorm warning at Aug 3, 2017, 9:48 PM CDT for LaPorte County, Indiana. It was in force for 27 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: Aug 3, 2017, 9:48 PM CDT (02:48 UTC)
Expired: Aug 3, 2017, 10:15 PM CDT
In force: 27 min
Issued by: NWS Northern Indiana
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County LaPorte County, IN

The radar

The Northern Indiana radar (KIWX), 99 km from the middle of the area, began a volume at 02:51 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

Lincoln, IL (KILX), launched 00:00Z, 2.8 hours before the alert went out and 228 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: 2243 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1105 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 12.0

Open this sounding in Storm Lab

The text

As transmitted.

921 
WUUS53 KIWX 040248
SVRIWX
INC091-040315-
/O.NEW.KIWX.SV.W.0113.170804T0248Z-170804T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Northern Indiana
948 PM CDT THU AUG 3 2017

The National Weather Service in Northern Indiana  has issued a

* Severe Thunderstorm Warning for...
  Northern La Porte County in northwestern Indiana...

* Until 1015 PM CDT

* At 946 PM CDT, a severe thunderstorm was located near Westville,
  moving northeast at 45 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Michigan City, La Porte, Westville, Trail Creek, Long Beach,
  Pottawattamie Park, Michiana Shores, Byron, Waterford, Pinhook,
  Otis, Pottawattomie Park, Rolling Prarie, Pinola, Hesston,
  Springville, Haskell and Hudson Lake.

This includes the following highways...
 Interstate 80 in Indiana between mile markers 38 and 61.
 Interstate 94 in Indiana between mile markers 33 and 45.
 Interstate 94 in Michigan near mile marker 0.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4171 8693 4172 8691 4176 8686 4176 8652
      4172 8652 4144 8693
TIME...MOT...LOC 0246Z 222DEG 39KT 4156 8697 

HAIL...1.00IN
WIND...60MPH
 
$$

FISHER

1 follow-up statement

966 
WWUS53 KIWX 040313
SVSIWX

Severe Weather Statement
National Weather Service Northern Indiana
1013 PM CDT THU AUG 3 2017

INC091-040322-
/O.EXP.KIWX.SV.W.0113.000000T0000Z-170804T0315Z/
La Porte IN-
1013 PM CDT THU AUG 3 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN LA PORTE COUNTY WILL
EXPIRE AT 1015 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

Please relay reports of damage to local law enforcement and ask them 
to pass onto the National Weather Service. 

LAT...LON 4171 8693 4172 8691 4176 8686 4176 8652
      4172 8652 4144 8693
TIME...MOT...LOC 0312Z 222DEG 39KT 4176 8673 

$$

FISHER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 7:12 PM CDT	Special Weather Statement	IWX	Jay	33 min
Aug 3, 10:12 PM CDT	Special Weather Statement	IWX	Marshall, Saint Joseph, Starke	48 min
Aug 3, 10:58 PM CDT	Special Weather Statement	IWX	Pulaski, Starke, White	32 min
Aug 3, 11:03 PM CDT	Special Weather Statement	IWX	Elkhart, Kosciusko, Marshall	27 min
Aug 3, 11:35 PM CDT	Special Weather Statement	IWX	Elkhart, LaGrange	25 min
Aug 4, 12:08 AM CDT	Special Weather Statement	IWX	LaGrange, Steuben	37 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2017 Every severe thunderstorm warning in 2017

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.