Alert archive / Indiana / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 39, NWS Northern Indiana

May 20, 2004LaPorte County, Indiana

NWS Northern Indiana issued this severe thunderstorm warning at May 20, 2004, 9:45 PM CDT for LaPorte County, Indiana. It was in force for 60 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: May 20, 2004, 9:45 PM CDT (02:45 UTC)
Expired: May 20, 2004, 10:45 PM CDT
In force: 60 min
Issued by: NWS Northern Indiana
Area: Counties, with a storm outline in the text

County LaPorte County, IN

The radar

The Northern Indiana radar (KIWX), 93 km from the middle of the area, began a volume at 02:44 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.

What was reported inside it

Time	Report	Where	Remark
May 20, 9:50 PM CDT	TSTM WND GST 60	Michigan City, IN	MEASURED AT MICHIGAN CITY COAST GUARD

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
May 20, 9:05 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.8 hours before the alert went out and 222 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: 2918 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 913 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 6.3

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KIWX 210245
SVRIWX
INC091-210345-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTHERN INDIANA
943 PM CDT THU MAY 20 2004

THE NATIONAL WEATHER SERVICE IN NORTHERN INDIANA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LA PORTE COUNTY IN INDIANA

* UNTIL 1045 PM CDT

* AT 943 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES NORTHWEST OF LONG BEACH...MOVING
  SOUTHEAST AT 45 MPH.

* SOME LOCATIONS IN THE PATH OF THIS SEVERE THUNDERSTORM ARE...      
  MICHIGAN CITY
  ROLLING PRAIRIE
  WANATAH
  LA PORTE
  KINGSBURY
  KINGSFORD HEIGHTS

SEEK SHELTER INSIDE A STURDY BUILDING AWAY FROM WINDOWS. SEVERE
STORMS CAN PRODUCE DAMAGING WINDS AND DESTRUCTIVE HAIL.

ONE INCH DIAMETER SIZE HAIL AND 65 MPH WINDS ARE LIKELY WITH THIS 
SEVERE STORM...ESPECIALLY NEAR THE LAKESHORE SEEK SHELTER 
IMMEDIATELY

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

LAT...LON 4175 8686 4175 8695 4139 8692 4139 8679
          4146 8669 4147 8656 4174 8654

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 10:18 PM CDT	Severe Thunderstorm Warning	IWX	Saint Joseph	57 min
May 20, 10:45 PM CDT	Severe Thunderstorm Warning	IWX	Elkhart	60 min
May 21, 11:15 AM CDT	Severe Thunderstorm Warning	IWX	Saint Joseph	60 min
May 21, 11:31 AM CDT	Severe Thunderstorm Warning	IWX	Elkhart, Marshall	44 min
May 21, 11:46 AM CDT	Severe Thunderstorm Warning	IWX	LaGrange	44 min
May 21, 11:50 AM CDT	Severe Thunderstorm Warning	IWX	Kosciusko	55 min
May 21, 12:05 PM CDT	Severe Thunderstorm Warning	IWX	Noble, Whitley	55 min
May 21, 12:19 PM CDT	Severe Thunderstorm Warning	IWX	Steuben	56 min
May 21, 12:21 PM CDT	Severe Thunderstorm Warning	IWX	LaGrange	54 min
May 21, 12:28 PM CDT	Severe Thunderstorm Warning	IWX	DeKalb	77 min
May 21, 12:47 PM CDT	Severe Thunderstorm Warning	IWX	Allen	73 min
May 21, 2:14 PM CDT	Severe Thunderstorm Warning	IWX	Adams	61 min
May 21, 4:00 PM CDT	Severe Thunderstorm Warning	IWX	Jay	45 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2004 Every severe thunderstorm warning in 2004

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.