Alert archive / Pennsylvania / Mesoscale Discussions in 2012
Mesoscale Discussion 62
The Storm Prediction Center issued this mesoscale discussion at Jan 23, 2012, 3:26 PM EST for 10 counties in Ohio; 15 counties in Pennsylvania; 15 counties in West Virginia. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Jan 23, 2012, 3:26 PM EST (20:26 UTC)
- Expired
- Jan 23, 2012, 5:00 PM EST
- In force
- 94 min
- Issued by
- the Storm Prediction Center
All 40 counties
Belmont County, OH, Carroll County, OH, Columbiana County, OH, Harrison County, OH, Jefferson County, OH, Mahoning County, OH, Monroe County, OH, Noble County, OH, Trumbull County, OH, Washington County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Fayette County, PA, Forest County, PA, Greene County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Doddridge County, WV, Hancock County, WV, Harrison County, WV, Marion County, WV, Marshall County, WV, Monongalia County, WV, Ohio County, WV, Pleasants County, WV, Preston County, WV, Ritchie County, WV, Taylor County, WV, Tyler County, WV, Wetzel County, WV, Wood County, WV
The radar
The Pittsburgh radar (KPBZ), 11 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.
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.4 hours before the alert went out and 284 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 627 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 252 m²/s²
- 0-3 km storm-relative helicity
- 214 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
688
ACUS11 KWNS 232027
SWOMCD
SPC MCD 232026
PAZ000-MDZ000-WVZ000-OHZ000-232200-
MESOSCALE DISCUSSION 0062
NWS STORM PREDICTION CENTER NORMAN OK
0226 PM CST MON JAN 23 2012
AREAS AFFECTED...FAR ERN OH...NRN WV...SW PA
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 232026Z - 232200Z
A LINE OF SHALLOW CONVECTION EXTENDING ACROSS FAR ERN OHIO WILL
CONTINUE TO BE CAPABLE OF PRODUCING GUSTY WINDS AND SMALL HAIL THIS
AFTERNOON. LITTLE LIGHTNING IS EXPECTED WITH THIS ACTIVITY AS IT
MOVES EWD INTO SWRN PA AND NRN WV.
LATEST SFC ANALYSIS SHOWED A COLD FRONT EXTENDING SEWD ACROSS ERN MI
INTO CNTRL OHIO SWWD INTO ERN KY. AHEAD OF THE FRONT AND BENEATH A
MID LEVEL DRYSLOT /PER LATEST WV IMAGERY/...SHALLOW CONVECTION HAS
PERSISTED WITH A FEW CELLS BECOMING DEEP ENOUGH TO PRODUCE
INFREQUENT LIGHTNING STRIKES. WITH BACKGROUND DEEP LAYER SWLY FLOW
ALREADY STRONG /50-80 KT/...THESE SHOWERS AND ISOLATED THUNDERSTORMS
WILL FURTHER ENHANCE CHANCES FOR STRONG/MARGINALLY SEVERE SFC WIND
GUSTS. WITH LITTLE IN THE WAY OF BUOYANCY /MLCAPE VALUES LESS THAN
250 J/KG/ AND WARM TEMPERATURES ALOFT FURTHER INHIBITING UPDRAFT
STRENGTH AND DEPTH...PROLONGED THUNDERSTORM ACTIVITY IS NOT
ANTICIPATED AND THEREFORE A WATCH IS NOT EXPECTED AT THIS TIME.
HOWEVER...CONVECTIVE TRENDS WILL CONTINUE TO BE MONITORED.
..LEITMAN.. 01/23/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CTP...PBZ...RLX...CLE...
LAT...LON 41138103 41508081 41667998 41537912 41307869 40207893
39347978 39138051 39218164 41138103SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 23, 1:52 AM EST | Mesoscale Discussion | SPC | Adams, Brown, Butler, Champaign, Clark, Clermont and 14 more | 113 min |
| Jan 23, 2:14 AM EST | Severe Thunderstorm Watch | SPC | Adams, Brown, Butler, Clermont, Clinton, Fayette and 6 more | 5 hr |
| Jan 23, 5:11 AM EST | Mesoscale Discussion | SPC | Pike, Ross, Scioto | 64 min |
| Jan 23, 11:46 AM EST | Mesoscale Discussion | SPC | Adams, Athens, Brown, Butler, Champaign, Clark and 34 more | 89 min |
Nearby
Mesoscale Discussions in Pennsylvania, 2012Mesoscale Discussions in West Virginia, 2012Mesoscale Discussions in Ohio, 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.