PBZ issues Area Forecast Discussion (AFD) at Apr 3, 11:33 AM EDT364
FXUS61 KPBZ 031533
AFDPBZ
Area Forecast Discussion
National Weather Service Pittsburgh PA
1133 AM EDT Thu Apr 3 2025
.SYNOPSIS...
A very active pattern over the next few days, with multiple
rounds of showers and storms. There will be flooding and severe
storm concerns through the weekend.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
KEY MESSAGES:
- Flood Watch remains in effect for portions of eastern Ohio.
- Showers mainly south of the Mason-Dixon early this afternoon.
- Another round of showers and storms returns areawide late this
afternoon into the overnight.
-------------------------------------------------------------------
A stalled front to our south continues to be the primary focus
for showers late this morning into the afternoon. This will
keep most rain south of the Mason-Dixon through mid-afternoon
and dry, though mostly-cloudy, conditions for the rest of us.
Another shortwave will cross the region late today. Focus for
shower and thunderstorm development will initially be tied to
the front this evening before spreading northwards with a deep
plume of moisture from the southwest.
Despite cloud cover, strong warm advection will push high
temperatures near 70F for most of the region this afternoon.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH SATURDAY/...
KEY MESSAGES:
- Showers and thunderstorms continue through the rest of the
work week as a front remains stalled over the area.
- A Flood Watch remains in effect for portions of eastern Ohio.
-------------------------------------------------------------------
The front is progged to drift south of the area tonight. However
widespread showers and storms should continue overnight as a
shortwave continues to pull a plume of deep moisture northward.
Some of the model data is showing a weak surface reflection
developing underneath the wave which will move across the area
late tonight and Friday morning. Eventually, the moisture plume
will exit the area on Friday and there should be a decrease in
shower coverage from north to south as Friday's activity will
become more focused near the stalled surface front.
Yet another surface low is then expected to track NE out of the
Mississippi Valley region Friday night, pushing the front back north
this time as a warm front. Showers and thunderstorms once again
increase in coverage as the front and surface low move across the
Upper Ohio Valley region Friday night into early Saturday.
However, if the front moves far enough north, we may see a break
in the activity late Friday night and Saturday morning as the
main moisture plume will be forced northward as well.
Amounts through the day on Saturday look to be highest from
Pittsburgh and north with forcing along the warm front and
enhanced convergence on the nose of an impinging 850 mb jet.
We'll briefly reside in the warm sector before the cold front
comes through in the latter half of the day bringing yet another
enhancement in rain coverage along it. The severe weather
potential should be limited due to weak instability, however
with repeated rounds of heavy rain and a saturated ground,
flooding potential will increase, especially with rises on area
rivers.
&&
.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
KEY MESSAGES:
- Showers/thunderstorms with potential for heavy rainfall continue
this weekend.
- A cold front moves through Sunday finally bringing an end to the
heavy rainfall threat.
- Colder next week with lighter rain/snow chances each day.
-------------------------------------------------------------------
Showers and thunderstorms continue Saturday night as the surface low
tracks through the area, yet is still unable to effectively move the
stalled frontal boundary. Ensembles suggest another heavier period
of rain on the nose of another low level jet Saturday night into
Sunday morning falling on a then very saturated ground. However,
ensemble clusters all agree on a deep upper trough swinging across
the eastern CONUS on Sunday into Monday which will finally shunt the
surface ridge that had been firmly planted over the southeast CONUS
coast and allow a cold front to advance through the area and off to
the east bringing an end to the heavy rain and storm potential.
There's some discrepancy in the timing of the upper pattern and how
quickly the trough axis arrives with the cluster dominated by the
GEPS suggesting a slower cessation of the rain in the Monday morning
hours.
The upper trough is then expected to persist across the NE CONUS
early next week, resulting in temperatures dipping to below normal
values and daily rain/snow chances, albeit not nearly as intense as
what we're experiencing this week.
&&
.AVIATION /15Z THURSDAY THROUGH MONDAY/...
Ports will remain largely dry through the afternoon with MVFR
cigs improving to VFR from north to south over the course of
the afternoon. By early evening, MVFR cig probabilities fall
into the single digits by late afternoon. This evening and
overnight, rain and cig/vis restriction return as a front drops
south across the region.
Outlook... The Upper Ohio River Valley will remain positioned
between a Central Plains trough and Atlantic ridge that will
foster multiple rounds of moderate to locally heavy rain through
Monday morning. Timing and shape in each wave remains variable,
which may alter the axis of highest precipitation rates and
areas of greatest restrictions. Aviation customers should
anticipate limited windows of VFR and dry conditions through the
period as the pattern favors MVFR/IFR restrictions, heavier
rain showers and occasional thunderstorms.
A deepening upper level trough may overtake the region early next
week, shifting towards a colder pattern featuring periodic rain/snow
chances and continued ceiling restrictions.
&&
.HYDROLOGY...
The potential for heavy rainfall will exist beginning tonight
and continuing into Sunday. At this time, areas across Ohio have
the potential to see the heaviest rainfall, where a Flood Watch
has been issued. Current NBM values indicate a 60 percent
chance or greater of at least 2 inches of rain over a 72 hr
period in this region. Lesser probabilities exist further east,
though a trend up has been noted in the latest ensemble guidance
and will need to be monitored for any potential expansion of the
flood watch. The exact location of the heaviest rain will
depend on the position of a quasi-stationary surface front.
Precipitable water is expected to remain elevated through
Sunday, with some periodic jet enhanced ascent. Even after the
heavy rain potential ends, river levels will likely remain
elevated for a few days. Current ensemble river forecast
projections also focus the most significant river rises across
Ohio.
Will monitor further trends for any future adjustments to the
watch.
&&
.PBZ WATCHES/WARNINGS/ADVISORIES...
PA...None.
OH...Flood Watch through Sunday morning for OHZ039-040-048-049-
057>059-068-069.
WV...None.
&&
$$
SYNOPSIS...22
NEAR TERM...Rackley
SHORT TERM...Cermak/22/MLB
LONG TERM...Cermak/MLB
AVIATION...88
HYDROLOGY...
Source:
PBZ issues Area Forecast Discussion (AFD) at Apr 3, 11:33 AM EDT---------------
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