Alert archive / Ohio / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 127, NWS Northern Indiana

July 29, 1999Williams County, Ohio

NWS Northern Indiana issued this severe thunderstorm warning at Jul 29, 1999, 10:47 PM EDT for Williams County, Ohio. It was in force for 48 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 29, 1999, 10:47 PM EDT (02:47 UTC)
Expired: Jul 29, 1999, 11:35 PM EDT
In force: 48 min
Issued by: NWS Northern Indiana
Area: Whole counties

County Williams County, OH

The radar

The Northern Indiana radar (KIWX), 95 km from the middle of the area, began a volume at 02:47 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
Jul 29, 10:57 PM EDT	Hail 0.75	Montpelier, OH
Jul 29, 10:57 PM EDT	Thunderstorm Wind	Montpelier, OH	Power lines and tree limbs down.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 2.8 hours before the alert went out and 160 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: 113 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 2353 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 182 m²/s²
0-3 km storm-relative helicity: 312 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Northern Indiana wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 29, 3:32 PM EDT, 7 hours 15 minutes earlier.

Area forecast discussion, Jul 29, 3:32 PM EDT, 7 hours 15 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 4:12 PM EDT	Severe Thunderstorm Warning	IWX	LaPorte	48 min
Jul 30, 5:19 PM EDT	Severe Thunderstorm Warning	IWX	Kosciusko	41 min
Jul 30, 5:28 PM EDT	Severe Thunderstorm Warning	IWX	Marshall	32 min
Jul 29, 10:01 PM EDT	Severe Thunderstorm Warning	IWX	Williams	44 min
Jul 29, 10:37 PM EDT	Severe Thunderstorm Warning	IWX	Fulton	48 min
Jul 29, 9:47 PM EDT	Severe Thunderstorm Warning	IWX	Branch	33 min

Nearby

Severe Thunderstorm Warnings in Ohio, 1999 Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.