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Area forecast discussion 
National Weather Service Cleveland Ohio
739 am EDT Monday Jul 6 2015

a weak disturbance will move north into eastern Ohio and western
Pennsylvania today. A slowing cold front will push south into the
area on Tuesday then stall across southern Ohio Tuesday night.
This boundary will lift back north on Wednesday night as a wave of
low pressure moves along the front and across Northern Ohio on


Near term /until 6 PM this evening/...
spotty returns and a shower being reported at kyng at 7am. No big
changes with this early morning update. Upper low spinning over
southeast Ohio will continue to lift northeast across western PA
today while opening up and shearing out. At the surface an
inverted trough extends north into eastern Ohio. This trough will
be around all day...dissipating toward sunset. Therefore expect an
increase in radar returns as the day GOES on...diurnally enhanced.
The deeper moisture for all of this remains across eastern Ohio/northwest
PA and left the previous forecast largely in tact with a Cleveland
to Mount Vernon line on the western most extent of precipitation
chances. Further west it will be much too try and too removed from
this system and the weather will be fair. Temperatures will be
suppressed some across the east...but will still allow them to get
into the upper 70s/around 80. Across the west it will be one of
the warmest days in while...expecting middle 80s. Toledo has not even
hit 90 yet this Summer...the last occurrence was in sept 2014.
Cleveland has only hit 90 once this June. Area is
running well below normal in number of 90 degree days. Toledo
averages 16 a year and cle 10. Cloud cover...showers...wet soils
all keeping temperatures in check.


Short term /6 PM this evening through Thursday night/...
eastern system pulls away this evening and shower chances diminish
as the evening progresses. Next system upstream across the upper
Midwest will be approaching the Chicago area Tuesday morning.
There likely will not be any precipitation into our area that early
Tuesday. Timing of the front still varies some...but have leaned
toward a GFS/European model (ecmwf) blend with the front just past cle around
8p/0z. Any severe chances seem minimal. Lacking better middle level
lapse rates and better middle level flow remains to the north. Front
will be slowing...eventually stalling Wednesday across southern
Ohio. Temperatures across the west on Tuesday will be dependent
upon shower timing...while those across the east will have a
better chance at getting into the middle 80s. Have lingered the
precipitation chances through the overnight across the east and south
into Wednesday morning. Even with precipitable waters Tuesday reaching 2
inches Tuesday...not too concerned about any widespread flooding
concerns. The break in the weather over the weekend has helped
with that and storms will be progressive. Brief heavy rain is
still possible. Weak ridging will be over the area on Wednesday
and temperatures will be limited in the 70s.

The front will settle somewhere to our south...but models continue
to want to advertise a wave to develop along the front and pull
that boundary back north Wednesday night. Cannot rule out a stray
shower/thunderstorm with its return.

The general consensus is that this wave crosses Northern Ohio/northwest PA
on Thursday but how fast and how far south the boundary will
actually get remains in question. Upper shortwave this is
associated with is hard to time and determine its strength this
far out. Therefore have not gone any higher than 40 to 55
percent. Continued precipitation chances into Thursday night.
Seventies again for highs Thursday.


Long term /Friday through Sunday/...
most of the models try to build the ridge aloft over the Midwest
and Ohio Valley late in the week. Clean warm ups have been hard
to come by this Summer and that may well be the case again as
various amounts of warm frontal precipitation are forecast by the
models Friday into the weekend.

No confidence on trying to time any of these warm frontal showers or
thunderstorm complexes this far out. Will have to have a "chance" of
showers and thunderstorms each day. Will not forecast the pop
too high...generally 30-50 percent chance...until we can resolve the
situation better.

Temperatures are tricky...depending on the exact location of the
front and the amount of clouds and showers. Temperatures could well be
above normal given the building heights but if the warm front is
just to the south and we have clouds and showers then it may be a
few degrees below normal. Will forecast temperatures near normal during the
day and a couple of degrees above normal at night by the weekend.


Aviation /12z Monday through Friday/...
patchy MVFR fog/haze over Northwest Ohio will lift middle morning.
A few light showers between kcak and kyng will drift north this
morning. A few additional showers and perhaps a thunderstormwill
develop midday and afternoon over extreme northeast Ohio and
northwest PA as weak low pressure passes by to the east. MVFR
conditions possible in the heavier showers otherwise VFR today
and tonight. Wind shifts likely at kcle and Keri this afternoon as
the lake breeze develops.

Outlook...non VFR conditions possible Tuesday through Thursday in showers and


the gradient is light enough today that a light east flow will
likely become onshore over much of the lake by this afternoon. The
flow will come around from the south for the entire lake this
evening as the south flow begins to increase ahead of the next cold
front. Showers and thunderstorms will likely develop on Tuesday and
mariners will have to be alert for the threat of gusty
thunderstorms. The showers and storms may sprint out ahead
of the front and winds may be somewhat variable until the front
clears the lake sometime Tuesday evening. Winds will veer toward the
north and northeast Wednesday as high pressure crosses the Great
Lakes but the front will not be far to the south. A wave of low
pressure is expected to develop on the front. The low pressure will
likely come close to Lake Erie on Thursday and the weather will
likely be unsettled. The frontal boundary may still be in the vicinity
of Lake Erie on Friday so not a lot of confidence that the weather
will clear up.


Cle watches/warnings/advisories...


near term...oudeman
short term...oudeman
long term...kosarik

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