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March 17-18 Snow/Ice


OHweather

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This was quite a change in forecast, although I will give the GFS credit for showing the OH river snow threat a few days out.  It also has the ice potential in Cincinnati tomorrow night....But a 1-2 degree change in temp profiles could mean game over and all rain.  Will be real interesting to watch this one....

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This was quite a change in forecast, although I will give the GFS credit for showing the OH river snow threat a few days out.  It also has the ice potential in Cincinnati tomorrow night....But a 1-2 degree change in temp profiles could mean game over and all rain.  Will be real interesting to watch this one....

Yeah...I'm not sure what to make of this over southern OH...precip shield ends up just a bit south tmr and there is no snow...or if it ends up just a bit farther north and it's too warm. I'll hope for a slushy inch here.

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NAM shows about 0.10"-0.25" of QPF for Monday morning around here.

 

Top-down sounding suggests it's mostly snow.

 

Not the heavy duty snows the GFS/GGEM was showing before, but at least we can try to recover whatever we can in the 11th hour.

The NAM is cooling NE OH enough for like .5-.75" of liquid to fall as snow...we'll see...I'm thinking the NE corner of the state sees like 1-2" of snow and maybe a brief period of zr. The storm tracking into extreme SE MI and the storm occluding before it gets there may also allow areas mainly north of the OH/MI boarder to hang on long enough for some token accums.

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Looks like a quick hitting 1" of snow here tomorrow morning, followed by the thermal ridge and clearing skies.  Should melt off quickly as temps reach the 40s, and then crash again late afternoon as strong CAA kicks in.  Sort of a non-event, but an interesting day of transitions.  This calls for a time lapse.  :popcorn:

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Thinking about 2" of snow here. Seems to be model consensus that the brunt of the limited QPF will come through while the column will support all snow. If the OV sfc low is weaker than progged though and sfc winds are more southerly rather than easterly, there could be bl thermal issues for YYZ. Not expecting that, but something to keep in mind. 

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Looks like a quick hitting 1" of snow here tomorrow morning, followed by the thermal ridge and clearing skies.  Should melt off quickly as temps reach the 40s, and then crash again late afternoon as strong CAA kicks in.  Sort of a non-event, but an interesting day of transitions.  This calls for a time lapse.  :popcorn:

 

Yeah, my sinuses love those kind of temperature swings.

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IND reporting -PL at 11:29pm. P&C forecast was plain rain.

Salem, IL reporting thundersnow and 37f...decent area of convection heading ENE. Won't run into substantial cold air until it hits northern OH. Have seen some wet globs of snow mix in with the rain here off and on the last two hours in Athens.

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ILN thinking about headlines due to prolonged wintry precip.

 

 

AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON OH 1044 PM EDT SUN MAR 17 2013 .SYNOPSIS... PRECIPITATION WILL CONTINUE TO OVERSPREAD THE AREA TONIGHT AS A LOW PRESSURE SYSTEM APPROACHES THE REGION. THE LOW PRESSURE SYSTEM WILL MOVE THROUGH THE AREA ON MONDAY AND PRECIPITATION WILL COME TO AN END ACROSS THE REGION MONDAY NIGHT. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... PRECIPITATION IS SPREADING NORTHWARD ACROSS OUR AREA THIS EVENING AS LOW PRESSURE APPROACHES FROM THE WEST. SUFFICIENT COLD AIR LINGERING ALOFT...COMBINED WITH STRONG ASCENT DUE TO AN ENCROACHING LOW LEVEL JET WILL ALLOW FOR INCREASING CHANCES FOR WINTRY PRECIPITATION FARTHER NORTH INTO OUR FORECAST AREA LATER TONIGHT. THIS AND OTHER FACTORS WILL PRODUCE SOME FORECAST DIFFICULTIES WE GO THROUGH THE OVERNIGHT PERIOD. THE FIRST TRICKY PART OF THE FORECAST TO MENTION WILL BE EXACTLY HOW LONG OUR WINTRY MIX OF SLEET...WITH POSSIBLY SNOW OR FREEZING RAIN WILL OCCUR ACROSS THE NORTH...BEFORE A FULL TRANSITION TO RAIN OCCURS BY DAYBREAK. CURRENT TOP DOWN METHODOLOGY INDICATES THAT A PERIOD OF UP TO SEVERAL HOURS OF MIXED FROZEN PRECIP COULD OCCUR FROM NOW UNTIL A FEW HOURS AFTER MIDNIGHT AS PRECIP SPREADS NORTH INTO THIS TRANSITION ZONE. THE PROBABILITY FOR A MORE PROLONGED PERIOD OF WINTRY PRECIP WILL BE PROGRESSIVELY HIGHER NORTHWARD OF INTERSTATE 70. HELD OFF ON ANY HEADLINES FOR THIS UPDATE AS THERE STILL REMAINS A LARGE AMOUNT OF UNCERTAINTY AS TO THE DURATION FOR THIS WINTRY MIX. THE SECOND CONCERN FOR TONIGHT IS RAIN MOVING ACROSS ZONES THAT RECEIVED SEVERAL INCHES OF SNOWFALL TODAY. REPORTS FROM OBSERVERS INDICATE THAT NEARLY .50 INCHES OF LIQUID EQUIVALENT REMAINED WITH THE SURFACE SNOW PACK AS OF THIS EVENING. WITH QPF AMOUNTS EXPECTED TO EXCEED A HALF INCH JUST DURING THIS OVERNIGHT PERIOD...THERE COULD BE POTENTIAL FLOODING ISSUES AS WE GO INTO MONDAY MORNING ACROSS THOSE AREAS. THE THIRD TRICKY PART OF THE OVERNIGHT PERIOD IS WHETHER THE ELEVATED INSTABILITY AND CLOUD PHYSICS THAT IS SUPPORTING THUNDER WITH SURFACE TEMPERATURES IN THE MIDDLE 30S TO OUR WEST...WILL MAKE IT INTO OUR AREA BEFORE DAYBREAK. WENT AHEAD AND ADDED THE MENTION OF THUNDER BEFORE SUNRISE ACROSS THE SOUTH...BASED ON CURRENT TRENDS TO OUR WEST...AND THE SPC SREF CALIBRATED THUNDERSTORM PROBABILITY FORECAST.

 

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