Alert archive / Ohio / Mesoscale Discussions in 2012
Mesoscale Discussion 1397
The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2012, 9:48 PM EDT for 41 counties in Ohio; Beaver County, Lawrence County, Washington County, Pennsylvania; 6 counties in West Virginia. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Jul 4, 2012, 9:48 PM EDT (01:48 UTC)
- Expired
- Jul 4, 2012, 11:15 PM EDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 50 counties
Athens County, OH, Belmont County, OH, Carroll County, OH, Champaign County, OH, Clark County, OH, Clinton County, OH, Columbiana County, OH, Coshocton County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Guernsey County, OH, Harrison County, OH, Hocking County, OH, Holmes County, OH, Jefferson County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Mahoning County, OH, Marion County, OH, Miami County, OH, Monroe County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Portage County, OH, Ross County, OH, Stark County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Vinton County, OH, Washington County, OH, Wayne County, OH, Beaver County, PA, Lawrence County, PA, Washington County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV, Pleasants County, WV, Tyler County, WV
The radar
The Cleveland radar (KCLE), 144 km from the middle of the area, began a volume at 01:50 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Cncnati-Daytn, OH (KILN), launched 00:00Z, 1.8 hours before the alert went out and 159 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
- 2070 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 1974 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 78 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.7
The text
As transmitted, in the capitals the NWS used until 2016.
539
ACUS11 KWNS 050149
SWOMCD
SPC MCD 050148
PAZ000-WVZ000-OHZ000-050315-
MESOSCALE DISCUSSION 1397
NWS STORM PREDICTION CENTER NORMAN OK
0848 PM CDT WED JUL 04 2012
AREAS AFFECTED...MUCH OF OH...WRN PA...NRN WV
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 050148Z - 050315Z
PROBABILITY OF WATCH ISSUANCE...60 PERCENT
SUMMARY...STORMS WILL CONTINUE SWD ACROSS OH INTO WRN PA AND NRN WV
WITH A FEW SEVERE GUSTS POSSIBLE. A WATCH MAY BE NEEDED.
DISCUSSION...STORMS HAVE FORMED A LOOSE LINE ACROSS N CNTRL OH...AND
WILL LIKELY PERSIST IN A SWD DIRECTION GIVEN MEAN WINDS ALOFT. RADAR
SHOWS SEVERAL OUTFLOWS WITH SOME INDICATING WINDS OVER 50 KT. PLENTY
OF INSTABILITY REMAINS IN PLACE AHEAD OF THESE STORMS...WITH MUCAPE
OVER 3600 NOTED ON THE 00Z ILN SOUNDING. A SEVERE THREAT WILL EXIST
WITH THESE STORMS AS THEY CONTINUE S...AS LONG AS THE OUTFLOW DOES
NOT OUTRUN THE NEWLY PROPAGATING CELLS.
..JEWELL/CORFIDI.. 07/05/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PBZ...RLX...CLE...ILN...
LAT...LON 40528414 40608317 40878204 41178140 41378053 41068019
40508006 40028009 39778043 39358104 39198176 39198247
39308324 39398381 39648423 39908433 40528414SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 10:19 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Athens, Auglaize, Belmont, Brown, Butler and 46 more | 4 hr |
| Jul 5, 4:12 AM EDT | Mesoscale Discussion | SPC | Cuyahoga, Erie, Huron, Lake, Lorain, Lucas and 2 more | 93 min |
| Jul 5, 6:16 AM EDT | Severe Thunderstorm Watch | SPC | Ashland, Ashtabula, Carroll, Columbiana, Coshocton, Crawford and 21 more | 3 hr |
| Jul 5, 8:00 AM EDT | Mesoscale Discussion | SPC | Athens, Belmont, Carroll, Columbiana, Coshocton, Fairfield and 18 more | 90 min |
| Jul 5, 11:14 AM EDT | Mesoscale Discussion | SPC | Gallia, Lawrence | 91 min |
| Jul 5, 11:37 AM EDT | Severe Thunderstorm Watch | SPC | Lawrence | 7 hr |
| Jul 5, 3:27 PM EDT | Mesoscale Discussion | SPC | Allen, Auglaize, Defiance, Fulton, Hancock, Hardin and 14 more | 93 min |
| Jul 5, 5:58 PM EDT | Mesoscale Discussion | SPC | Allen, Auglaize, Butler, Champaign, Clark, Clermont and 33 more | 92 min |
| Jul 4, 8:05 PM EDT | Mesoscale Discussion | SPC | Bedford, Fayette, Fulton, Somerset | 55 min |
| Jul 5, 4:37 PM EDT | Mesoscale Discussion | SPC | Adams, Blair, Centre, Cumberland, Dauphin, Franklin and 6 more | 113 min |
| Jul 5, 2:57 PM EDT | Mesoscale Discussion | SPC | Greenbrier, McDowell, Mercer, Monroe, Summers | 2 hr |
Nearby
Mesoscale Discussions in Ohio, 2012Mesoscale Discussions in West Virginia, 2012Mesoscale Discussions in Pennsylvania, 2012Every mesoscale discussion in 2012
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.