Alert archive / Ohio / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 679

August 18, 20014 counties in Indiana; 11 counties in Kentucky; 29 counties in Ohio

The Storm Prediction Center issued this severe thunderstorm watch at Aug 18, 2001, 8:30 PM EDT for 4 counties in Indiana; 11 counties in Kentucky; 29 counties in Ohio. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Aug 18, 2001, 8:30 PM EDT (00:30 UTC)
Expired
Aug 19, 2001, 1:00 AM EDT
In force
5 hr
Issued by
the Storm Prediction Center
All 44 counties

Dearborn County, IN, Jefferson County, IN, Ohio County, IN, Switzerland County, IN, Boone County, KY, Bracken County, KY, Campbell County, KY, Carroll County, KY, Gallatin County, KY, Grant County, KY, Kenton County, KY, Mason County, KY, Pendleton County, KY, Robertson County, KY, Trimble County, KY, Adams County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Coshocton County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Hamilton County, OH, Highland County, OH, Holmes County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Miami County, OH, Montgomery County, OH, Morrow County, OH, Pickaway County, OH, Richland County, OH, Ross County, OH, Union County, OH, Warren County, OH

The radar

The Cincinnati radar (KILN), 18 km from the middle of the area, began a volume at 00:26 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 nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 0.5 hours before the alert went out and 20 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 00:00Z on 2001-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 992 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2001-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 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
992 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
887 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.8

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
Aug 19, 3:15 PM EDTSevere Thunderstorm WatchSPCMartin5 hr

Nearby

Severe Thunderstorm Watches in Ohio, 2001Severe Thunderstorm Watches in Kentucky, 2001Severe Thunderstorm Watches in Indiana, 2001Every severe thunderstorm watch in 2001

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.