Alert archive / Indiana / Tornado Watches in 1999

Tornado Watch 140

April 8, 199974 counties in Indiana; 21 counties in Kentucky

The Storm Prediction Center issued this tornado watch at Apr 8, 1999, 11:30 PM EST for 74 counties in Indiana; 21 counties in Kentucky. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 8, 1999, 11:30 PM EST (04:30 UTC)
Expired
Apr 9, 1999, 4:00 AM EST
In force
5 hr
Issued by
the Storm Prediction Center
All 95 counties

Adams County, IN, Bartholomew County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Cass County, IN, Clark County, IN, Clay County, IN, Clinton County, IN, Crawford County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Delaware County, IN, Dubois County, IN, Fayette County, IN, Floyd County, IN, Fountain County, IN, Franklin County, IN, Gibson County, IN, Grant County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Harrison County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jackson County, IN, Jay County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Newton County, IN, Ohio County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Perry County, IN, Pike County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Spencer County, IN, Sullivan County, IN, Switzerland County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Warren County, IN, Warrick County, IN, Washington County, IN, Wayne County, IN, Wells County, IN, White County, IN, Breckinridge County, KY, Bullitt County, KY, Carroll County, KY, Daviess County, KY, Hancock County, KY, Hardin County, KY, Henderson County, KY, Henry County, KY, Jefferson County, KY, Larue County, KY, Marion County, KY, McLean County, KY, Meade County, KY, Nelson County, KY, Ohio County, KY, Oldham County, KY, Shelby County, KY, Spencer County, KY, Trimble County, KY, Washington County, KY, Webster County, KY

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 8, 11:51 PM ESTSevere Thunderstorm WarningINDSullivan, Vigo49 min
Apr 9, 12:05 AM ESTSevere Thunderstorm WarningINDFountain, Vermillion, Warren30 min
Apr 9, 12:05 AM ESTSevere Thunderstorm WarningINDParke30 min
Apr 9, 12:56 AM ESTSevere Thunderstorm WarningIWXCass, Miami49 min
Apr 9, 1:43 AM ESTSevere Thunderstorm WarningLMKOrange17 min
Apr 9, 1:54 AM ESTSevere Thunderstorm WarningPAHPike36 min
Apr 9, 1:55 AM ESTSevere Thunderstorm WarningINDShelby30 min
Apr 9, 2:20 AM ESTSevere Thunderstorm WarningLMKCrawford, Harrison30 min
Apr 9, 2:43 AM ESTSevere Thunderstorm WarningLMKFloyd22 min
Apr 9, 2:49 AM ESTSevere Thunderstorm WarningLMKClark41 min
Apr 9, 2:54 AM ESTTornado WarningINDJennings26 min
Apr 9, 3:02 AM ESTTornado WarningILNRipley48 min
Apr 9, 3:26 AM ESTTornado WarningILNDearborn34 min

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 4.5 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 1999-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 859 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 00:00Z on 1999-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 344 square meters per square second.1939587897Sfc1 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
859 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
1075 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
344 m²/s²
0-3 km storm-relative helicity
449 m²/s²
Significant tornado parameter
1.9
Supercell composite
8.7

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 9, 2:00 AM ESTTornado WatchSPCBath, Boone, Bourbon, Boyd, Boyle, Bracken and 39 more5 hr
Apr 9, 4:30 AM ESTTornado WatchSPCBell, Breathitt, Casey, Clay, Clinton, Cumberland and 17 more3 hr

Nearby

Tornado Watches in Indiana, 1999Tornado Watches in Kentucky, 1999Every tornado watch in 1999

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.