Alert archive / Indiana / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 165

April 26, 201749 counties in Indiana; 7 counties in Ohio

The Storm Prediction Center issued this severe thunderstorm watch at Apr 26, 2017, 5:58 PM EDT for 49 counties in Indiana; 7 counties in Ohio. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Apr 26, 2017, 5:58 PM EDT (21:58 UTC)
Expired
Apr 26, 2017, 10:23 PM EDT
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 56 counties

Adams County, IN, Allen 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, Elkhart County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Johnson County, IN, Kosciusko County, IN, LaGrange County, IN, Madison County, IN, Marion County, IN, Marshall County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Noble County, IN, Owen County, IN, Parke County, IN, Pulaski County, IN, Putnam County, IN, Randolph County, IN, Shelby County, IN, Steuben County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Wells County, IN, White County, IN, Whitley County, IN, Defiance County, OH, Fulton County, OH, Henry County, OH, Paulding County, OH, Putnam County, OH, Van Wert County, OH, Williams County, OH

The radar

The Northern Indiana radar (KIWX), 58 km from the middle of the area, began a volume at 21:59 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
10%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
50%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 26, 6:24 PM EDTSevere Thunderstorm WarningINDClay, Owen, Parke, Putnam, Vermillion, Vigo36 min
Apr 26, 6:45 PM EDTTornado WarningINDMorgan, Owen, Putnam20 min
Apr 26, 6:53 PM EDTSevere Thunderstorm WarningINDBoone, Clinton, Montgomery37 min
Apr 26, 6:59 PM EDTSevere Thunderstorm WarningINDBoone, Hendricks, Putnam31 min
Apr 26, 7:18 PM EDTSevere Thunderstorm WarningINDBoone, Clinton, Howard, Tipton42 min
Apr 26, 7:25 PM EDTSevere Thunderstorm WarningINDBoone, Hamilton, Hendricks, Marion35 min
Apr 26, 7:46 PM EDTSevere Thunderstorm WarningIWXGrant, Miami, Wabash44 min
Apr 26, 7:49 PM EDTSevere Thunderstorm WarningINDHoward, Tipton26 min
Apr 26, 8:07 PM EDTSevere Thunderstorm WarningINDDelaware, Hamilton, Howard, Madison, Tipton23 min
Apr 26, 8:20 PM EDTSevere Thunderstorm WarningIWXGrant, Huntington, Wabash40 min
Apr 26, 8:28 PM EDTSevere Thunderstorm WarningIWXBlackford, Grant, Wells38 min
Apr 26, 8:30 PM EDTSevere Thunderstorm WarningINDDelaware, Madison15 min
Apr 26, 8:42 PM EDTSevere Thunderstorm WarningIWXAdams, Allen, Huntington, Wells48 min
Apr 26, 8:59 PM EDTSevere Thunderstorm WarningIWXAdams, Wells21 min
Apr 26, 9:26 PM EDTSevere Thunderstorm WarningIWXAllen, DeKalb34 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 10.0 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, Cncnati-Daytn, OH at 12:00Z on 2017-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Cncnati-Daytn, OH at 12:00Z on 2017-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 111 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1088 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
111 m²/s²
0-3 km storm-relative helicity
63 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
Apr 26, 4:53 PM EDTMesoscale DiscussionSPCClay, Gibson, Knox, Posey, Sullivan, Vigo97 min
Apr 26, 7:10 PM EDTMesoscale DiscussionSPCSpencer, Warrick95 min

Nearby

Severe Thunderstorm Watches in Indiana, 2017Severe Thunderstorm Watches in Ohio, 2017Every severe thunderstorm watch 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.