Toledo Weather - Tue, May 20, 2014 spc ac 201244 day 1 convective outlook nws storm prediction center norman ok 0744 am cdt tue may 20 2014 valid 201300z - 211200z ...there is a slgt risk of svr tstms from ern ia to srn wi...nrn il...nrn ind...srn lower mi...and much of ohio... ...there is a slgt risk of svr tstms from sern wy to nern co... ...summary... severe thunderstorms with the potential to produce damaging winds...a couple of tornadoes...and large hail are expected to develop late this afternoon and early evening from eastern iowa to the wisconsin/illinois border. initially...the greatest threat from these thunderstorms will come in the form of large hail and perhaps a tornado or two. into the late evening and overnight the storms should form into a squall line complex with damaging winds and hail possible from northern illinois east across southern lake michigan...northern indiana...southern lower michigan...and northwest ohio. isolated to scattered late afternoon and evening storms are possible along and east of the front range of the rockies from southeast wyoming to northeast colorado. some storms may produce hail and high winds. ...synopsis... morning water vapor satellite loop and objective analysis data depict two vigorous mid/upper lows on either coast...one digging sewd across coastal/central ca...the other spinning sewd away from cape cod and the gulf of maine. the expansive midsection of the nation is dominated by a broad belt of generally anticyclonic mid/upper level flow with a 70-90kt 300mb jet arcing from the four corners region to the nrn plains to the upper ms valley. a shortwave disturbance over the nrn plains was cresting the periphery of the broad upper ridge and will contribute to modest height falls and strengthening deep-layer wly flow over the upper ms valley and great lakes regions today and tonight. at the sfc...a weak cold front associated with low pressure over srn manitoba arcs from mn across cntrl/wrn ia to swrn ks and then wwd/nwwd to the front range of the rockies. warm/moist air ahead of the front was being transported enewd across the middle ms valley and midwest...aided by 40-50 kt low level jet from the plains to great lakes. forcing for ascent along the advancing cold front is forecast to strengthen from ia to wi this afternoon coincident with the approach of the nrn plains shortwave trough and maximum in diurnal destabilization. ...ern ia/srn wi/nrn and cntrl il/nrn ind/srn lwr mi/oh... large scale mid-level pattern is one that favors the effective ewd transport of steep lapse rates from the high plains to the midwest. the steeper mid-level lapse rates associated with the eml plume are just becoming evident in morning soundings from dvn and ilx. moisture transport into this region is also being aided on the large scale by persistent sly low level flow on the wrn flank of ern u.s. anticyclone. expect sfc dewpoints to continue to climb and reach the low to mid 60s f from ia to srn wi beneath a modest capping inversion associated with the eml. daytime heating ahead of the cold front should support moderate to locally strong sfc-based instability /sbcape 2000-2500 j/kg/ by late afternoon. there are a variety of forecast scenarios across the midwest slgt risk area today and tonight. that variety introduces uncertainty as to timing of convective initiation...storm mode...and possible mcs/qlcs evolution. the most likely scenario given an abundance of guidance...the pattern and time of year...is that robust convection will initiate ahead of the cold front from ern ia to srn wi in the 21z to 00z time frame. bulk shear in the 40-50kt range...and aforementioned instability parameters...will be more than adequate for supercells with the potential to produce very large hail and strong winds. a tornado threat will also exist during this initial phase...especially near weak frontal waves and/or storm-scale/ mesoscale boundaries. the combination of strengthening upper forcing and linear convergence on the advancing front should contribute to an evening transition to a forward propagating qlcs. this transition should occur amidst moderate instability...and on the srn edge of 50-60kt mid-level wly flow. the evolving qlcs could produce numerous damaging wind events from the chicago area south and east across lake michigan to nrn ind/swrn lwr mi through late evening. isolated significant wind gusts are possible if qlcs upscale growth is realized relatively early in the evening when sfc-based instability will be greater. however...certainty in this scenario is not sufficient enough at this time to warrant higher significant wind probabilities and/or the introduction of a mdt risk for some of the area. severe hail/wind potential with the advancing squall line should wane with ewd extent and a decrease in sfc-based instability through the late night/early morning hours. nonetheless...some severe wind/hail potential may spread as far east as the oh/wv/pa border areas before daybreak wednesday. ...front range to cntrl high plains... in the wake of a frontal passage...modest low-level upslope flow and sfc dewpoints in the 40s should contribute to at least isolated storms developing through late afternoon/early evening. most guidance suggests no more than scattered development given generally neutral large scale ascent and height rises aloft. any storms that can form will do so amidst steep mid-level lapse rates and a veering low-level wind profile. thus there is a risk for organized updrafts capable of large hail and strong winds. ..carbin/bothwell.. 05/20/2014 click to get wuus01 ptsdy1 product note: the next day 1 outlook is scheduled by 1630z hr. fxus61 kcle 201348 afdcle area forecast discussion national weather service cleveland oh 948 am edt tue may 20 2014 synopsis... a warm front will move into western ohio this afternoon. it should cross all of ohio by wednesday morning. as low pressure moves across the central great lakes wednesday evening it will allow a cold front to slide across the region. this front may not clear eastern ohio until thursday morning. high pressure will build in for the end of the week. && near term /until 6 pm this evening/... scattered showers continue to move east across the area and have begun to push into the extreme east. so will go ahead and add a mention of showers in that area. as the day time heating picks up with the few breaks of sun expected...showers with a few thunderstorms are possible in the afternoon. warm front lies across indiana at this time and is expected to lift northeast across the region tonight. models hinting at potential mcs tracking east along the boundary tonight so will have to monitor that situation as it develops. previous discussion... showers that moved across the central county warning area have fallen apart as it moved into the drier air across the east. we are now watching the next round of showers develop over indiana and moving into nw oh. these area also rather light with maybe a few hundredths possible. these should decrease as we begin to mix this morning. previous discussion... 5h piece of jet energy and some middle level moisture have been enough to cause an area of light showers/sprinkles across the western county warning area. as it continues to move eastward drier air at the lower level should make it shrink in coverage and may be little more than sprinkles across the central and eastern county warning area. we will then wait for a warm front to move into the western portion of ohio this afternoon. as the boundary lifts northward with additional low level moisture and the region reaches its highs the stage will be set for the development of showers and thunderstorms. the main show will likely wait until the overnight hours. in any event we will begin to mention some isolated thunder chances this afternoon into the early evening. it will be warmer today but the amount of cloud cover will play a roll. highs across the central and west should be able to get into the 70s. a few upper 70s will be possible across nw ohio if clouds thin a bit during the afternoon. cooler with highs approaching 70 across the eastern third of the area since the warm front will take longer to arrive. && short term /6 pm this evening through friday night/... the warm front interaction with the convection that develops over illinois and indiana will be interesting to watch this evening into the overnight hours. current thinking is that strong to severe thunderstorms that develop west of the region will organize into an mcs that will track near the warm front. the main concern will be strong damaging winds but large hail will be possible. thought about the need of a flash flood watch but not confident enough on the track of an mcs. best way to handle this would be as we see the mcs develop and hoist a watch at that time. the warm front should lift north of most of the county warning area by mid morning on wednesday. we will then see how well the atmosphere recovers from the first round of thunderstorms. however warmer and more unstable air will advect into the region wednesday afternoon ahead of the front. a stronger piece of jet energy will be moving into the county warning area wednesday evening which will increase the lift near and ahead of the cold front. this strong jet should help to generate a squall line that could bring another round of strong damaging winds to the region. of concern is the increasing low level shear as the jet energy arrives wednesday evening. if storms remain isolated/scattered there could be a chance that the storms will rotate which would increase the tornado threat. more details on this over the next 24 hours. the front should clear the county warning area by thursday morning. however some lingering showers may persist across the ne portion of the region as the upper level low takes up residence over the new england states. the showers may not exit the region until friday afternoon as high pressure builds into the central great lakes. it will be warm on wednesday after the region recovers from tonights thunderstorms. highs should be in the 70s to near 80 wednesday afternoon. cooler thursday into friday with highs slightly below seasonal averages. && long term /saturday through monday/... models remain in good agreement that high pressure will build over the region from the west on saturday as the upper level trough shifts out over the atlantic. the air mass dries out considerably and expecting skies on saturday to range from mostly sunny in the west to partly sunny for just a fraction of the day in the east before clouds mix out. areas closer to the lake will be influenced by the marine layer with mostly sunny skies but temperatures running a little cooler than inland locations. a gradual warming trend gets underway over the weekend beneath the building upper level ridge. temperatures expected to warm 4-6 degrees between saturday and sunday into the low to mid 70s...then be closer to 80 or possibly even lower 80s for memorial day. the air mass will be fairly dry so expecting humidity to be low with a dry forecast. && aviation /12z tuesday through saturday/... vfr conditions remain across the area with ceilings decreasing to 4-6 kft from west to east as moisture continues to increase. this increase in moisture will also result in scattered showers which can already be seen on regional radars across nw ohio. the challenge for today will be timing thunderstorms...especially as instability increases tonight. it looks like energy moving around the ridge will cause an increase in thunderstorm activity starting around 03z...with the possibility of a large thunderstorm complex developing. some of these thunderstorms will produce heavy rainfall with ifr visibilities. strong wind gusts will also be possible...mainly at tol/fdy. only included vcts in the tafs for now given the uncertainty in timing. southeast winds will veer to the south overnight as a warm front lifts north. outlook...non vfr conditions possible in showers and thunderstorms tuesday night and wednesday. && marine... southeast to easterly flow of 5 to 15 knots expected on the lake today...veering to the south overnight with the passage of a warm front. showers and thunderstorms are possible overnight into wednesday...some of which could be strong. an area of low pressure will move across the lake on wednesday with a cold front pushing south across the lake early thursday. winds will shift to the northwest behind the front and waves in the nearshore waters east of cleveland will build to near 4 feet. a small craft advisory may be needed for a window of time before high pressure starts to build in from the west on friday with decreasing winds and waves. the extended forecast is calling for generally good boating conditions as we head into the memorial day weekend. && cle watches/warnings/advisories... oh...none. pa...none. marine...none. && $$ synopsis...mullen near term...lombardy/mullen short term...mullen long term...kec aviation...kec marine...kec hr. Toledo 7-day forecast Last Update: May 20, 2014 9:38 am This Afternoon: A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 77. Southwest wind 13 to 15 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. Tonight: Showers and thunderstorms likely, mainly after 4am. Cloudy, with a low around 61. Southwest wind 6 to 9 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible. Wednesday: Showers and thunderstorms likely, mainly before 7am. Mostly cloudy, with a high near 80. Light southwest wind becoming west 5 to 10 mph in the morning. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible. Wednesday Night: Partly cloudy, with a low around 55. West wind around 10 mph. Thursday: Sunny, with a high near 70. Northwest wind 9 to 16 mph. Thursday Night: Partly cloudy, with a low around 50. Friday: Mostly sunny, with a high near 69. Friday Night: Partly cloudy, with a low around 49. Saturday: Sunny, with a high near 76. Saturday Night: Mostly clear, with a low around 52. Sunday: Sunny, with a high near 78. Sunday Night: Mostly clear, with a low around 58. Memorial Day: Mostly sunny, with a high near 80. hr. hazardous weather outlook national weather service cleveland oh 421 am edt tue may 20 2014 ohz003-006>014-017>023-027>033-036>038-047-089-paz001>003-210830- lucas-wood-ottawa-sandusky-erie oh-lorain-cuyahoga-lake-geauga- ashtabula inland-hancock-seneca-huron-medina-summit-portage-trumbull- wyandot-crawford-richland-ashland-wayne-stark-mahoning-marion-morrow- holmes-knox-ashtabula lakeshore-northern erie-southern erie- crawford pa- 421 am edt tue may 20 2014 this hazardous weather outlook is for north central ohio...northeast ohio...northwest ohio and northwest pennsylvania. .day one...today and tonight. there is a slight chance of severe thunderstorms in an area near and west of a line from cleveland to canton late this evening into the overnight. the main threat will be strong damaging winds but large hail will be possible. locally heavy rainfall overnight could cause some flooding. .days two through seven...wednesday through monday. the slight chance of severe thunderstorms continues into wednesday but may all hinge on the convective development that occurs tuesday night. in any event another around of thunderstorms should develop along a cold front that will cross the region through wednesday evening. strong damaging winds and large hail will be possible near and ahead of the cold front. locally heavy rainfall will once again occur with thunderstorms with some flooding possible. .spotter information statement... spotter activation is not expected at this time. #toledo - #weather