Alert archive / Ohio / Mesoscale Discussions in 2014
Mesoscale Discussion 1997
The Storm Prediction Center issued this mesoscale discussion at Dec 24, 2014, 7:48 PM EST for 11 counties in Ohio; 9 counties in Pennsylvania; 6 counties in West Virginia. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Dec 24, 2014, 7:48 PM EST (00:48 UTC)
- Expired
- Dec 24, 2014, 8:45 PM EST
- In force
- 57 min
- Issued by
- the Storm Prediction Center
All 26 counties
Ashtabula County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Geauga County, OH, Harrison County, OH, Jefferson County, OH, Lake County, OH, Mahoning County, OH, Portage County, OH, Trumbull County, OH, Allegheny County, PA, Beaver County, PA, Butler County, PA, Crawford County, PA, Greene County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Washington County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV, Tyler County, WV, Wetzel County, WV
The radar
The Pittsburgh radar (KPBZ), 43 km from the middle of the area, began a volume at 00:50 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 nearest sounding before it
Pittsburgh, PA (KAGC), launched 00:00Z, 0.8 hours before the alert went out and 59 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
- 89 J/kg
- Mixed-layer CIN
- -158 J/kg
- Mixed-layer LCL
- 1428 m above ground
- 0-6 km bulk shear
- 117 kt
- 0-1 km storm-relative helicity
- 379 m²/s²
- 0-3 km storm-relative helicity
- 435 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
533
ACUS11 KWNS 250048
SWOMCD
SPC MCD 250048
PAZ000-WVZ000-OHZ000-250145-
MESOSCALE DISCUSSION 1997
NWS STORM PREDICTION CENTER NORMAN OK
0648 PM CST WED DEC 24 2014
AREAS AFFECTED...PORTIONS OF ERN OH...WRN PA...EXTREME NRN WV...LE
CONCERNING...SEVERE THUNDERSTORM WATCH 564...
VALID 250048Z - 250145Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 564
CONTINUES.
SUMMARY...THE THREAT OF SEVERE WEATHER WILL REMAIN BRIEF/ISOLATED
OVER VALID PORTIONS OF WW AREA THROUGH 02-03Z. A DOWNSTREAM WW IS
NOT ANTICIPATED.
DISCUSSION...A BROKEN LINE OF LOW-TOPPED CONVECTION EXTENDED FROM
JUST EAST OF LAKE COUNTY OH SOUTH TO BROOK COUNTY OH AND CONTINUES
TO MOVE EAST AT AROUND 40 KTS. DESPITE VERY LITTLE INSTABILITY
/MUCAPE OF AROUND 100 J/KG/...AT LEAST SOME POTENTIAL FOR A
STRONG/MARGINALLY SEVERE GUST WILL EXIST IN THE STRONGER CELLS WITH
DOWNWARD MOMENTUM TRANSPORT OF STRONG LOW-LEVEL BACKGROUND WINDS /55
KT AT 1 KM AGL SAMPLED BY PBZ VWP/.
AS THE ALREADY MEAGER INSTABILITY CONTINUES TO DIMINISH...THE
OVERALL THREAT WILL CONTINUE TO DIMINISH AND AN ADDITIONAL
DOWNSTREAM WW IS NOT ANTICIPATED.
..BUNTING.. 12/25/2014
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PBZ...RLX...CLE...
LAT...LON 41908160 41968096 42028018 41917985 41547958 41017961
40297977 40007994 39668040 39488071 39358098 39688095
40988128 41908160Nearby
Mesoscale Discussions in Ohio, 2014Mesoscale Discussions in Pennsylvania, 2014Mesoscale Discussions in West Virginia, 2014Every mesoscale discussion in 2014
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.