Alert archive / Ohio / Mesoscale Discussions in 2012
Mesoscale Discussion 1349
The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2012, 7:22 PM EDT for 10 counties in Ohio; 10 counties in Pennsylvania; Brooke County, Hancock County, Ohio County, West Virginia. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Jul 1, 2012, 7:22 PM EDT (23:22 UTC)
- Expired
- Jul 1, 2012, 8:45 PM EDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 23 counties
Carroll County, OH, Columbiana County, OH, Geauga County, OH, Harrison County, OH, Jefferson County, OH, Mahoning County, OH, Portage County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Crawford County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Washington County, PA, Brooke County, WV, Hancock County, WV, Ohio County, WV
The radar
The Pittsburgh radar (KPBZ), 36 km from the middle of the area, began a volume at 23:25 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
Pittsburgh, PA (KPIT), launched 12:00Z, 11.4 hours before the alert went out and 52 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
- 529 J/kg
- Mixed-layer CIN
- -169 J/kg
- Mixed-layer LCL
- 1414 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.9
The text
As transmitted, in the capitals the NWS used until 2016.
785
ACUS11 KWNS 012323
SWOMCD
SPC MCD 012322
PAZ000-WVZ000-OHZ000-020045-
MESOSCALE DISCUSSION 1349
NWS STORM PREDICTION CENTER NORMAN OK
0622 PM CDT SUN JUL 01 2012
AREAS AFFECTED...NERN OH...WRN PA
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 012322Z - 020045Z
PROBABILITY OF WATCH ISSUANCE...60 PERCENT
SUMMARY...A SVR TSTM WATCH MAY BE NEEDED DOWNSTREAM OF THE
CNTRL/N-CNTRL OHIO CONVECTIVE LINE. TRENDS WILL CONTINUE TO BE
MONITORED.
DISCUSSION...CONVECTION CONTINUES TO ELONGATE ALONG THE N-S-ORIENTED
LEADING EDGE OF A COLD POOL MATERIALIZING ACROSS THE WRN HALF OF
OHIO OWING TO BOTH NRN AND CNTRL OHIO CONVECTIVE CLUSTERS. MODERATE
MID-LEVEL FLOW PER CLEVELAND VWP DATA OFFERING 35-50 KT OF EFFECTIVE
BULK SHEAR IS PRESENT. COLD POOL/SHEAR INTERACTIONS MAY BE ADEQUATE
TO CONTINUE TO SUPPORT UPSCALE CONVECTIVE GROWTH AS ACTIVITY
APPROACHES NERN OH AND EVENTUALLY WRN PA. AS SUCH...SOME POTENTIAL
FOR A RELATIVELY MORE SUBSTANTIAL DMGG WIND THREAT MAY ENSUE.
HOWEVER...RELATIVELY MORE LIMITED INSTABILITY NORTH OF A DIFFUSE
STATIONARY FRONT MAY HINDER MORE ROBUST CONVECTIVE GROWTH DESPITE
ENHANCEMENT OFFERED BY COLD POOL/SHEAR BALANCE. AS SUCH...WW
ISSUANCE DOWNSTREAM IS NOT CERTAIN...BUT IS POSSIBLE.
..COHEN/HART.. 07/01/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CTP...PBZ...CLE...
LAT...LON 39978043 40298142 41198162 41878088 41947969 41517927
40657942 40187977 39978043SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 1:16 PM EDT | Severe Thunderstorm Watch | SPC | Allen, Auglaize, Champaign, Clark, Darke, Defiance and 11 more | 6 hr |
| Jul 1, 3:56 PM EDT | Mesoscale Discussion | SPC | Allen, Athens, Auglaize, Champaign, Clark, Clinton and 36 more | 94 min |
| Jul 1, 4:32 PM EDT | Severe Thunderstorm Watch | SPC | Athens, Belmont, Carroll, Clinton, Columbiana, Coshocton and 28 more | 6 hr |
| Jul 1, 5:19 PM EDT | Mesoscale Discussion | SPC | Ashland, Crawford, Erie, Fulton, Hancock, Henry and 16 more | 56 min |
| Jul 1, 5:40 PM EDT | Severe Thunderstorm Watch | SPC | Ashland, Crawford, Cuyahoga, Erie, Geauga, Hancock and 19 more | 4 hr |
| Jul 1, 5:45 PM EDT | Mesoscale Discussion | SPC | Athens, Champaign, Clark, Clinton, Darke, Delaware and 20 more | 60 min |
| Jul 1, 5:59 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Butler, Clermont, Hamilton, Scioto | 5 hr |
| Jul 1, 6:47 PM EDT | Mesoscale Discussion | SPC | Ashland, Coshocton, Crawford, Erie, Hancock, Holmes and 14 more | 58 min |
| Jul 1, 12:11 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Columbia, Dauphin and 16 more | 64 min |
| Jul 1, 1:35 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 1 more | 6 hr |
| Jul 1, 3:25 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 2 more | 95 min |
| Jul 1, 9:27 AM EDT | Mesoscale Discussion | SPC | McDowell, Mercer, Monroe, Wyoming | 63 min |
| Jul 1, 9:44 AM EDT | Severe Thunderstorm Watch | SPC | McDowell, Mercer | 5 hr |
Nearby
Mesoscale Discussions in Ohio, 2012Mesoscale Discussions in Pennsylvania, 2012Mesoscale Discussions in West Virginia, 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.