|With weak ascent, limited mid-moisture to create ice in the cloud, and ground temperatures below freezing due to surface winds prevailing from the east/northeast, light freezing rain occurred.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PBZ wrote it up.
Light precipitation was forecasted with the approach and passage of a shortwave.|With weak ascent, limited mid-moisture to create ice in the cloud, and ground temperatures below freezing due to surface winds prevailing from the east/northeast, light freezing rain occurred.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Pittsburgh, PA wrote its last area forecast discussion before the first event at Feb 13, 7:25 AM EST, 35 minutes earlier.
Area Forecast Discussion National Weather Service Pittsburgh PA 725 AM EST Sat Feb 13 2021 .SYNOPSIS... Periodic precipitation chance and seasonably cold temperature will continue through next week. && .NEAR TERM /THROUGH TONIGHT/... Upper flow is backing to the southwest in response to a digging trough over the central CONUS. Light precipitation chance returns today with the approach and passage of a weak shortwave within this flow. Changing frontal orientation and warm advection indicate mixed precip for the area with model soundings showing sparse mid level moisture with the warmth capping a saturating boundary layer. As the ascent signal and mid-moisture are very limited, only chance pops were maintained for some light snow with efficiency compromised by the aforementioned mid level warmth. Light freezing rain or drizzle is also possible though given the moist sfc layer, but confidence in problematic ice accumulation is low at moment, so no advisory will be issued for now. && .SHORT TERM /SUNDAY THROUGH TUESDAY/... Shortwave ridging is expected to keep Sunday mostly dry in the wake of todays disturbance. The sw flow over the Upper OH is forecast to continue through mid week with a series of crossing shortwaves within flow defining precip chances. The first of significance is indicated for late Sunday night and early Monday, while another and stronger impulse is timed for Monday night with an early Tuesday exit. Models are not consistent in depictions of omega/ascent magnitude with the first of these systems on Monday with GFS being much stronger, although deterministic trends of timing and more of an open wave situation are in line. The second on Monday night is stronger in the ascent field given indications of at least a brief coupled jet/enhanced frontogenesis scenario; however, all models rapidly encroach a mid level dry slot early on Tuesday which will shut down problematic precipitation efficiency. In addition, the shifting baroclinic zone in the southwest flow pattern will degrade snowfall efficiency for part of the area, but add the element of mixed precip including freezing rain to the problem. At moment, the mid level frontogenetic zone is indicated just northwest of Pittsburgh and that is where the heavier snow forecast was drawn for these two shortwave passages. With a break indicated Monday afternoon, the question of a collaborated headline at this point is not clear. Nonetheless, hazardous wintry weather should be anticipated, especially on Monday night, and headlines are likely. && .LONG TERM /TUESDAY NIGHT THROUGH FRIDAY/... The southwest flow pattern is forecast to continue with yet another potent embedded shortwave indicated for late week. && .AVIATION /13Z SATURDAY THROUGH WEDNESDAY/... VFR prevails early this morning, but MVFR cigs will shift northward through the morning hours in advance of the next shortwave. Thus have put some TEMPO groups in for most of the terminals to highlight that transition period. The shortwave will bring light precipitation to the region in the form of snow and/or freezing rain mainly after 14z. Further deterioration to IFR is expected by this afternoon, with restrictions continuing through tonight. .Outlook... Widespread restrictions are expected again Monday and Tuesday with another winter system. && .PBZ WATCHES/WARNINGS/ADVISORIES... PA...None. OH...None. WV...None. &&
Hazardous Weather Outlook National Weather Service Pittsburgh PA 407 AM EST Sat Feb 13 2021 OHZ039>041-048-PAZ007>009-013>016-020-022-023-WVZ001-140915- Tuscarawas-Carroll-Columbiana-Coshocton-Mercer-Venango-Forest- Lawrence-Butler-Clarion-Jefferson PA-Beaver-Armstrong-Indiana- Hancock- 407 AM EST Sat Feb 13 2021 This Hazardous Weather Outlook is for east central Ohio, northwest Pennsylvania, southwest Pennsylvania, western Pennsylvania and northern West Virginia. .DAY ONE...Today and tonight. Hazardous weather is not expected at this time. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Accumulating snow is expected in two waves. The first on Sunday night and early Monday. The second on Monday night and early Tuesday. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. OHZ049-050-057>059-068-069-PAZ021-029-031-073>076-WVZ002>004-012-021- 509>514-140915- Harrison-Jefferson OH-Muskingum-Guernsey-Belmont-Noble-Monroe- Allegheny-Washington-Greene-Westmoreland- Higher Elevations of Westmoreland-Fayette- Higher Elevations of Fayette-Brooke-Ohio-Marshall-Wetzel-Marion- Monongalia-Ridges of Eastern Monongalia and Northwestern Preston- Preston-Eastern Preston-Western Tucker-Eastern Tucker- 407 AM EST Sat Feb 13 2021 This Hazardous Weather Outlook is for east central Ohio, southwest Pennsylvania, western Pennsylvania, northern West Virginia and the northern panhandle of West Virginia. .DAY ONE...Today and tonight. Weak low pressure is expected to generate some light snow or areas of freezing drizzle today and early tonight. Should widespread freezing drizzle develop, an advisory may be needed. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Accumulating snow and mixed precipitation including freezing rain is expected in two waves. The first on Sunday night and early Monday. The second on Monday night and early Tuesday. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures.
The national radar mosaic for the moment the first event began.
1 winter weather. Local standard time, as filed.
Up to a trace of ice observed due to freezing drizzle.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2021Every state in 2021This day in weather historyWarnings in Ohio, February 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 943364.