Area Forecast Discussion
Issued by NWS Cleveland, OH
Issued by NWS Cleveland, OH
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270 FXUS61 KCLE 220621 AFDCLE Area Forecast Discussion National Weather Service Cleveland OH 221 AM EDT Wed May 22 2024 .SYNOPSIS... A strong low pressure system moving into northern Ontario will push a cold front into the region Wednesday morning and moving through later in the day Wednesday, stalling out along the Ohio River Valley Wednesday night and Thursday. High pressure Thursday. Another cold front stalls over northern Ohio Thursday night into Friday. && .NEAR TERM /THROUGH TONIGHT/... 930 PM Update... Made slight adjustments to temperatures as current temperatures are a few degrees warmer than previously forecast. Ultimately raised the overnight a degree or two across the area, but the remainder of the forecast is unchanged. 630 PM Update... The lake breeze has begun to weaken and any shower/thunderstorm development along it has diminished. This should leave the area dry until late tonight when the cold front approaches the area from the west bringing with it the potential of some showers/storms. There were minor adjustments to the wind forecast to reflect the decaying lake breeze, but aside from that there were no other changes needed. Previous Discussion... Plenty of surface based instability with heating today with low level lapse rates over 7C/km, but there is clear evidence of mid level drying occurring as seen on the mid level water vapor satellite imagery. While a couple of isolated showers have formed along the lakeshore east of Cleveland and near Erie, PA, the thinking is that this drying will largely inhibit any large scale convection today. However, a few more isolated cells during the remainder of peaking heating cannot be completely ruled out along the lake breeze boundary. Meanwhile, a low pressure system moving into the Mississippi Valley will continue an eastward track through the overnight hours. Expecting a linear complex of storms to approach the western CWA after 09Z tonight, but the thought is that moving into northwest Ohio, these storms will likely be in a decaying phase. Cold front enters the CWA after 12Z. Depending on the morning convective debris moving eastward and how fast is dissolves out/moves out expecting quick destabilization in the late morning hours with convective initiation again after 15Z. Multiple forcing mechanisms possible here with the cold front, old outflow boundaries, and possible differential heating boundaries despite synoptic scale winds near the lakeshore. Track of the low pressure system will turn northward into the Thunder Bay region of northern Ontario and will be occluding. Will get a noticeable decrease in the low level jet strength Wednesday as a result with a lowering of the 0-6km shear. Still have a wind threat with dry air above around 600mb that could enhance gusts where the dynamics in the column may not be as strong. The best threat for severe is roughly east of the I-71 corridor, and still carry a slight risk from SPC for Wednesday. Some directional shear could produce some rotating storms as well. Cold front will ultimately be slow to exit the southeast zones into Wednesday night with the front well out ahead of the aforementioned occluding low. && .SHORT TERM /THURSDAY THROUGH FRIDAY/... The overall 500 mb mid level steering flow aloft will be west- southwesterly towards the end of the week. A slow moving and weak frontal boundary will be near central Ohio on Thursday. Afternoon heating will allow for scattered showers and thunderstorms to once again develop along and near this weak frontal boundary. The higher POPs will be closer to central Ohio and lesser values near the lakeshore areas. Thursday`s high temperatures will be a little cooler than previous days but still in the middle 70s to lower 80s. A shortwave trough will move across the Upper Midwest into the western Great Lakes region on Friday. This shortwave trough will help the stalled frontal boundary over central or southern Ohio lift back as a warm front on Friday. Scattered showers and thunderstorms will develop again with the warm front lifting through Friday afternoon and evening. High temps will be warmer in the lower to middle 80s on Friday. A weak area of low pressure will track eastward across the Upper Great Lakes region late Friday night into Saturday. A trailing cold front will advance across the Great Lakes and Ohio Valley region late Friday night. Showers and thunderstorms will be likely ahead and along this frontal boundary late Friday night. It appears that this system will be coming through during the weakest thermodynamics and organized convection is not anticipated at this time. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... A cold front will be pushing through during the first half of the day on Saturday. Showers and isolated thunderstorms will be possible early in the day before drier air moves in from the west. High pressure will build in over the area late Saturday into Saturday night. Temperatures will be cooler this weekend with highs in the 70s and overnight lows in the 50s. Another shortwave trough will track across the Ohio Valley late Sunday into early Monday with another round of showers and storms. Temperatures will remain slightly above average through the weekend. && .AVIATION /06Z Wednesday THROUGH Sunday/... VFR with clear conditions will start off the TAF period this morning. Winds early this morning will slowly increase ahead of a system that will allow for shower and storm chances today. Toward daybreak, some showers and storms will approach the KTOL and KFDY corridor but will be on a weakening trend, if they even arrive. Have a VCTS mention for now, but this could be overdone still and have all other conditions as VFR. The boundary of these storms that will enter will progress east today and likely be a trigger to new storm development this afternoon. The main area would be KCLE to KMFD and east, although confidence in a TS at a terminal is limited to just KCAK, KYNG, and KERI, and have a TEMPO window when the best chance for a TS at those terminals would be this afternoon. Additional TS is unlikely after a brief window this afternoon and clouds will be present across the region until a final cold frontal passage. Behind the front, skies will trend to clear and winds will favor a generally westerly flow. Outlook...Scattered showers and storms on Friday and Saturday could also bring brief non-VFR conditions. && .MARINE... A lake breeze has developed again near the lakeshore this afternoon. This weak lake breeze will fizzle out closer to sunset this evening. Winds should shift from the southeast under 10 knots this evening. A southwest flow of 10 to 15 knots will develop late tonight in response to an approaching cold front by Wednesday morning. Winds will diminish to 5 to 10 knots behind the front late Wednesday and briefly become westerly Wednesday night. Winds will shift from the south or southwest around 10 knots Thursday through early Friday. East to southeast winds 10 to 15 knots are expected Friday night through Saturday. No marine headlines for the lake are anticipated at this time through the weekend. && .CLE WATCHES/WARNINGS/ADVISORIES... OH...None. PA...None. NY...None. MARINE...None. && $$ SYNOPSIS...26 NEAR TERM...Campbell/26 SHORT TERM...Griffin LONG TERM...Griffin AVIATION...Sefcovic MARINE...Griffin