Alert archive / Indiana / Tornado Watches in 2013

Tornado Watch 127

April 18, 201333 counties in Indiana; Allen County, Putnam County, Van Wert County, Ohio

The Storm Prediction Center issued this tornado watch at Apr 18, 2013, 4:32 PM EDT for 33 counties in Indiana; Allen County, Putnam County, Van Wert County, Ohio. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Apr 18, 2013, 4:32 PM EDT (20:32 UTC)
Expired
Apr 18, 2013, 7:30 PM EDT
In force
3 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 36 counties

Adams County, IN, Bartholomew County, IN, Blackford County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Daviess County, IN, Decatur County, IN, Delaware County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Jackson County, IN, Jay County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Owen County, IN, Putnam County, IN, Randolph County, IN, Rush County, IN, Shelby County, IN, Sullivan County, IN, Vigo County, IN, Wells County, IN, Allen County, OH, Putnam County, OH, Van Wert County, OH

The radar

The Indianapolis radar (KIND), 55 km from the middle of the area, began a volume at 20:34 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
20%
One or more EF2 to EF5 tornadoes
10%
Ten or more severe wind reports
20%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
10%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
60%

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, 8.5 hours before the alert went out and 232 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 2013-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 2013-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -203 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
474 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
-203 m²/s²
0-3 km storm-relative helicity
-478 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 17, 9:21 PM EDTMesoscale DiscussionSPCCass, Champaign, Christian, Coles, DeWitt, Douglas and 21 more84 min
Apr 17, 9:53 PM EDTMesoscale DiscussionSPCCalhoun, Greene, Jersey, Pike, Scott97 min
Apr 17, 10:57 PM EDTTornado WatchSPCAdams, Brown, Pike7 hr
Apr 17, 11:48 PM EDTMesoscale DiscussionSPCChampaign, Christian, Coles, DeWitt, Douglas, Edgar and 12 more57 min
Apr 18, 12:46 AM EDTMesoscale DiscussionSPCCalhoun, Greene, Morgan, Pike, Scott89 min
Apr 18, 3:01 AM EDTMesoscale DiscussionSPCCalhoun, Jersey89 min
Apr 18, 5:02 AM EDTMesoscale DiscussionSPCCalhoun, Greene, Jersey, Monroe58 min
Apr 18, 6:36 AM EDTMesoscale DiscussionSPCBond, Clinton, Fayette, Madison, Monroe, Montgomery and 3 more54 min
Apr 18, 6:42 AM EDTTornado WatchSPCBond, Clinton, Fayette, Jersey, Macoupin, Madison and 6 more8 hr
Apr 18, 8:25 AM EDTMesoscale DiscussionSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 17 more95 min
Apr 18, 9:31 AM EDTTornado Watch PDSSPCClark, Clay, Coles, Crawford, Cumberland, Douglas and 6 more7 hr
Apr 18, 10:25 AM EDTTornado WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more8 hr
Apr 18, 12:14 PM EDTMesoscale DiscussionSPCClark, Clay, Crawford, Jasper, Lawrence, Marion and 4 more2 hr
Apr 18, 1:48 PM EDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more87 min
Apr 18, 3:47 PM EDTMesoscale DiscussionSPCClark, Crawford, Lawrence88 min
Apr 18, 6:33 PM EDTMesoscale DiscussionSPCAdams, Allen, Bartholomew, Blackford, Boone, Brown and 43 more117 min

Nearby

Tornado Watches in Indiana, 2013Tornado Watches in Ohio, 2013Every tornado watch in 2013

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.