Alert archive / Ohio / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 146, NWS Pittsburgh, PA

August 12, 2018Muskingum County, Ohio

NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 12, 2018, 6:37 PM EDT for Muskingum County, Ohio. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 12, 2018, 6:37 PM EDT (22:37 UTC)
Expired: Aug 12, 2018, 7:00 PM EDT
In force: 23 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Muskingum County, OH

The radar

The Pittsburgh radar (KPBZ), 159 km from the middle of the area, began a volume at 22:38 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 12:00Z, 10.6 hours before the alert went out and 164 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 355 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 971 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -38 m²/s²
0-3 km storm-relative helicity: 9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pittsburgh, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 12, 3:28 PM EDT, 3 hours 9 minutes earlier.

Area forecast discussion, Aug 12, 3:28 PM EDT, 3 hours 9 minutes before

Area Forecast Discussion
National Weather Service Pittsburgh PA
328 PM EDT Sun Aug 12 2018

.SYNOPSIS...
Upper level low pressure will be the dominant weather feature
until late Tuesday, though with limited moisture, thunderstorm
coverage will remain scattered outside of the high terrain.
Temperatures will be near to just below normal.

&&

.NEAR TERM /UNTIL 6 AM MONDAY MORNING/...
Isolated showers and a thunderstorm or two will be possible
through the evening in Ohio and in the terrain of WV/PA/MD where
some modest moisture resides with the help of the lake and the
residual boundary respectively. Between these two areas, the
lack of moisture at the center of the upper low will keep
conditions dry and comfortable, with some BL mixing bringing
dewpoints down into the mid 50's.

Any isolated showers/storms will dissipate with the loss of
heating tonight. Temperatures overnight should be close to
seasonal averages, with some fog possible in the valleys.

&&

.SHORT TERM /6 AM MONDAY MORNING THROUGH WEDNESDAY/...
Upper low will remain in place Monday, before lifting toward new
England Tuesday. The bulk of the showers and storms will remain
diurnally driven, with some increase in PoPs anticipated as
modest moisture returns to the entire region. Shortwave rotating
around the departing trough will support the continuation of
showers Monday night through Tuesday morning with northwest flow
likely to keep scattered showers and storms through the rest of
the day on Tuesday. Temperatures will remain near or slightly
below seasonal averages with the upper troughs influence through
Tuesday. Then, brief upper ridging will keep conditions dry and
seasonably warm on Wednesday.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
The return of SW flow will lend to increasing shower and
thunderstorm chances once again for the latter half of the week,
with the deterministic guidance swinging a cold front through
the Ohio Valley by late Friday/Saturday. Some timing differences
need to be resolved at this juncture, so a blend of guidance,
with some emphasis on climo was used considering the run to run
inconsistencies.

Temperatures will stay near seasonal averages, if not slightly
above until the weekend.

&&

.AVIATION /19Z SUNDAY THROUGH FRIDAY/...
Dry NE low level flow and weak sfc ridging will keep the area
largely dry. A stray shower later in the afternoon can't be completely
ruled out...but a coverage looks to be too low to include at
any TAF site. Forecast soundings again show potential for pre
dawn fog development.

OUTLOOK...
An ocnl restriction potential continues through Tue under the
upper low, with aftn/eve convection and overnight fog where
precip occurs. Restriction potential returns Thu with low
pressure.

&&

.PBZ WATCHES/WARNINGS/ADVISORIES...
MD...None.
OH...None.
PA...None.
WV...None.

&&

Hazardous weather outlook, Aug 12, 3:33 AM EDT, 15 hours 4 minutes before

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In the hours before

Special weather statement, Aug 12, 5:06 PM EDT, 1 hour 31 minutes before

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Special weather statement, Aug 12, 5:22 PM EDT, 1 hour 15 minutes before

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Special weather statement, Aug 12, 6:35 PM EDT, 2 minutes before

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The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 9:07 PM EDT	Areal Flood Advisory	PBZ	Jefferson	113 min
Aug 12, 5:06 PM EDT	Special Weather Statement	PBZ	Tuscarawas	24 min
Aug 12, 5:22 PM EDT	Special Weather Statement	PBZ	Tuscarawas	23 min
Aug 12, 6:35 PM EDT	Special Weather Statement	PBZ	Muskingum	25 min

Nearby

Severe Thunderstorm Warnings in Ohio, 2018 Every severe thunderstorm warning in 2018

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.