Alert archive / Ohio / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 52, NWS Northern Indiana

May 17, 1999Henry County, Ohio

NWS Northern Indiana issued this severe thunderstorm warning at May 17, 1999, 9:13 PM EDT for Henry County, Ohio. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 17, 1999, 9:13 PM EDT (01:13 UTC)
Expired: May 17, 1999, 10:00 PM EDT
In force: 47 min
Issued by: NWS Northern Indiana
Area: Whole counties

County Henry County, OH

The radar

The Northern Indiana radar (KIWX), 136 km from the middle of the area, began a volume at 01:17 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 17, 9:00 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 1.2 hours before the alert went out and 163 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: 545 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1864 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.4

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 May 17, 10:35 AM EDT, 10 hours 38 minutes earlier.

Area forecast discussion, May 17, 10:35 AM EDT, 10 hours 38 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
935 AM EST MON MAY 17 1999

SQUALL LINE EXTENDING NORTHWEST TO SOUTHEAST ACROSS NRN AND CNTRL IL
MOVING AROUND 40 KTS... CONSISTENT WITH STRONG 700/500 MB FLOW.

TEMPS A FEW DEGREES AHEAD OF YDAS READINGS WITH DEWPTS IN THE MID
TO UPPER 60S ACRS CWA. VIS STLT INDICATES CLEARING ACRS AREA SO SHD
SEE FULL SUN NEXT CPL OF HOURS TO DESTABILIZE AMS. MAIN THREAT FOR
SVR WILL BE HAIL...WBZERO AROUND 10K FT... AND WINDS... WITH KIWX VWP
INDICATING 50KTS 11-12K FT.

UPR LVL JET FROM CNTRL PLNS TO HUDSON BAY WILL PROVIDE ADDITIONAL
LIFT THIS AFTN WITH FCST AREA NEAR RIGHT ENTRANCE REGION. IL SQUALL
LINE/ASSOCD OUTFLOW SHOULD PROVIDE FOCUS FOR AFTN CONVECTION AND PSBL
SVR TSTMS. RUC-2 HAS CAPES NR 3750 J/KG BY 21Z BISECTING THE CWA FROM
NE TO SW... FROM ABT COLDH2O TO IWX TO LAF.

BASED ON YDAS HIGHS AND CURRENT TEMPS... WOULD EXPECT MID 80S AGAIN
TDA ALTHOUGH CONVECTION MOVING INTO WRN PTN CWA BY NOON MAY KEEP
TEMPS IN LOWER 80S THERE.

.KIWX...NONE

JAH

In the hours before

Local storm report, May 17, 6:11 PM EDT, 3 hours 2 minutes before

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Local storm report, May 17, 6:23 PM EDT, 2 hours 50 minutes before

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Local storm report, May 17, 7:13 PM EDT, 2 hours before

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Local storm report, May 17, 7:13 PM EDT, 2 hours before

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Local storm report, May 17, 7:45 PM EDT, 1 hour 28 minutes before

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Local storm report, May 17, 7:52 PM EDT, 1 hour 21 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
May 17, 9:23 PM EDT	Severe Thunderstorm Warning	IWX	Fulton	47 min
May 17, 9:35 PM EDT	Severe Thunderstorm Warning	IWX	Paulding	50 min
May 17, 10:09 PM EDT	Severe Thunderstorm Warning	IWX	Defiance, Henry	31 min
May 17, 10:25 PM EDT	Severe Thunderstorm Warning	IWX	Fulton	45 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.