Alert archive / Indiana / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 664

July 21, 200436 counties in Indiana; 11 counties in Ohio

The Storm Prediction Center issued this severe thunderstorm watch at Jul 21, 2004, 6:35 PM EST for 36 counties in Indiana; 11 counties in Ohio. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 21, 2004, 6:35 PM EST (23:35 UTC)
Expired
Jul 22, 2004, 12:00 AM EST
In force
5 hr
Issued by
the Storm Prediction Center
All 47 counties

Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, DeKalb County, IN, Delaware County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Madison County, IN, Marion County, IN, Miami County, IN, Montgomery County, IN, Parke County, IN, Putnam County, IN, Randolph County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Allen County, OH, Auglaize County, OH, Defiance County, OH, Fulton County, OH, Henry County, OH, Mercer County, OH, Paulding County, OH, Putnam County, OH, Shelby County, OH, Van Wert County, OH, Williams County, OH

The radar

The Northern Indiana radar (KIWX), 91 km from the middle of the area, began a volume at 23:34 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.

Warnings issued inside it

15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 21, 6:38 PM ESTSevere Thunderstorm WarningINDFountain, Vermillion52 min
Jul 21, 7:06 PM ESTSevere Thunderstorm WarningINDTippecanoe, Warren54 min
Jul 21, 7:06 PM ESTSevere Thunderstorm WarningIWXWhite39 min
Jul 21, 7:20 PM ESTSevere Thunderstorm WarningINDMontgomery, Parke40 min
Jul 21, 7:28 PM ESTSevere Thunderstorm WarningINDFountain32 min
Jul 21, 7:39 PM ESTSevere Thunderstorm WarningINDCarroll51 min
Jul 21, 7:54 PM ESTSevere Thunderstorm WarningIWXWilliams51 min
Jul 21, 7:57 PM ESTSevere Thunderstorm WarningINDMontgomery, Parke48 min
Jul 21, 8:03 PM ESTSevere Thunderstorm WarningINDBoone57 min
Jul 21, 8:06 PM ESTSevere Thunderstorm WarningINDClinton39 min
Jul 21, 8:10 PM ESTSevere Thunderstorm WarningINDHendricks, Putnam65 min
Jul 21, 8:32 PM ESTSevere Thunderstorm WarningINDMarion58 min
Jul 21, 9:10 PM ESTSevere Thunderstorm WarningINDHendricks35 min
Jul 21, 9:24 PM ESTSevere Thunderstorm WarningINDMorgan, Putnam66 min
Jul 21, 9:25 PM ESTSevere Thunderstorm WarningINDJohnson, Marion80 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.6 hours before the alert went out and 221 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2004-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1988 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2004-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1988 J/kg
Mixed-layer CIN
-181 J/kg
Mixed-layer LCL
825 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 21, 9:03 AM ESTMesoscale DiscussionSPCAllen, Benton, Blackford, Boone, Carroll, Cass and 36 more117 min
Jul 21, 10:18 AM ESTMesoscale DiscussionSPCAdams, Allen, Benton, Blackford, Carroll, Cass and 24 more87 min
Jul 21, 1:01 PM ESTMesoscale DiscussionSPCBenton, Cass, Fulton, Jasper, Lake, LaPorte and 7 more89 min
Jul 21, 2:35 PM ESTSevere Thunderstorm WatchSPCElkhart, Jasper, Kosciusko, LaGrange, Lake, LaPorte and 8 more6 hr
Jul 21, 5:09 PM ESTMesoscale DiscussionSPCBenton, Elkhart, Fulton, Jasper, Kosciusko, LaGrange and 11 more36 min
Jul 21, 6:20 PM ESTMesoscale DiscussionSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 43 more25 min

Nearby

Severe Thunderstorm Watches in Indiana, 2004Severe Thunderstorm Watches in Ohio, 2004Every severe thunderstorm watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.