Alert archive / Ohio / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 239
The Storm Prediction Center issued this severe thunderstorm watch at May 21, 2004, 4:25 PM EDT for 27 counties in Ohio. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 21, 2004, 4:25 PM EDT (20:25 UTC)
- Expired
- May 21, 2004, 10:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 27 counties
Athens County, OH, Auglaize County, OH, Champaign County, OH, Clark County, OH, Clinton County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Hocking County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Muskingum County, OH, Perry County, OH, Pickaway County, OH, Preble County, OH, Ross County, OH, Shelby County, OH, Union County, OH, Vinton County, OH, Warren County, OH
The radar
The Cincinnati radar (KILN), 69 km from the middle of the area, began a volume at 20:26 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.
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 4:43 PM EDT | Severe Thunderstorm Warning | ILN | Champaign, Logan | 62 min |
| May 21, 5:00 PM EDT | Severe Thunderstorm Warning | ILN | Licking | 60 min |
| May 21, 5:05 PM EDT | Severe Thunderstorm Warning | ILN | Franklin | 55 min |
| May 21, 5:10 PM EDT | Severe Thunderstorm Warning | ILN | Madison | 50 min |
| May 21, 5:11 PM EDT | Tornado Warning | ILN | Licking | 34 min |
| May 21, 5:14 PM EDT | Severe Thunderstorm Warning | PBZ | Muskingum | 61 min |
| May 21, 5:36 PM EDT | Severe Thunderstorm Warning | ILN | Darke | 39 min |
| May 21, 5:40 PM EDT | Flash Flood Warning | PBZ | Muskingum | 3 hr |
| May 21, 5:51 PM EDT | Flash Flood Warning | RLX | Perry | 3 hr |
| May 21, 5:52 PM EDT | Flash Flood Warning | ILN | Shelby | 83 min |
| May 21, 6:21 PM EDT | Severe Thunderstorm Warning | ILN | Pickaway | 39 min |
| May 21, 6:34 PM EDT | Severe Thunderstorm Warning | ILN | Clark | 41 min |
| May 21, 6:44 PM EDT | Flash Flood Warning | ILN | Franklin | 2 hr |
| May 21, 6:47 PM EDT | Flash Flood Warning | RLX | Athens | 118 min |
| May 21, 6:51 PM EDT | Severe Thunderstorm Warning | RLX | Athens | 39 min |
| May 21, 7:49 PM EDT | Severe Thunderstorm Warning | ILN | Fayette | 41 min |
The nearest sounding before it
Cncnati-Daytn, OH (KILN), launched 12:00Z, 8.4 hours before the alert went out and 68 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.
- Mixed-layer CAPE
- 2750 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 666 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 114 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 4.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 10:05 PM EDT | Severe Thunderstorm Watch | SPC | Defiance, Fulton, Lucas, Williams | 5 hr |
| May 21, 2:40 AM EDT | Mesoscale Discussion | SPC | Ashland, Carroll, Columbiana, Coshocton, Crawford, Cuyahoga and 20 more | 65 min |
| May 21, 4:45 AM EDT | Mesoscale Discussion | SPC | Belmont, Carroll, Columbiana, Coshocton, Fairfield, Franklin and 12 more | 60 min |
| May 21, 10:40 AM EDT | Mesoscale Discussion | SPC | Allen, Crawford, Cuyahoga, Defiance, Erie, Fulton and 14 more | 2 hr |
| May 21, 1:05 PM EDT | Severe Thunderstorm Watch | SPC | Allen, Ashland, Auglaize, Champaign, Coshocton, Crawford and 32 more | 4 hr |
| May 21, 2:19 PM EDT | Mesoscale Discussion | SPC | Ashland, Ashtabula, Carroll, Columbiana, Crawford, Cuyahoga and 27 more | 116 min |
| May 21, 3:15 PM EDT | Severe Thunderstorm Watch | SPC | Ashtabula, Belmont, Carroll, Columbiana, Cuyahoga, Geauga and 10 more | 6 hr |
| May 21, 6:35 PM EDT | Severe Thunderstorm Watch | SPC | Gallia, Meigs | 4 hr |
Nearby
Severe Thunderstorm Watches in Ohio, 2004Every severe thunderstorm watch in 2004
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.