Moist air advancing over existing snow pack ahead of a warm front resulted in widespread dense fog late on February 27th and early on February 28th. The fog dissipated by late morning.
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The episode as NWS PHI wrote it up.
Moist air advancing over existing snow pack ahead of a warm front resulted in widespread dense fog late on February 27th and early on February 28th. The fog dissipated by late morning.
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 Philadelphia/Mount Holly wrote its last area forecast discussion before the first event at Feb 27, 5:52 PM EST, 5 hours 8 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Mount Holly NJ 552 PM EST Fri Feb 27 2026 .WHAT HAS CHANGED... No significant changes. && .KEY MESSAGES... 1. An arctic front late Saturday night into Sunday may bring some snow to our northern areas. 2. A couple waves of low pressure may impact the region through the middle of next week with periods of wintry precipitation possible. 3. A significant warm-up is expected late next week. && .DISCUSSION... KEY MESSAGE 1...An arctic front late Saturday night into Sunday may bring some snow to our northern areas. A mild period starts the weekend with highs likely well into the 50s for much of the region Saturday, helping along the snow melt. A cold front will then advance into the region Saturday night, stalling out as it does so. A wave of low pressure then moves eastward to our north during the morning Sunday, producing some spotty showers of rain and snow, especially across the northern areas (Poconos/NW NJ) where a small accumulation is possible. Behind the front, we'll see a return of winter, at least for a day or two, with temps falling below normal again. Highs will be about 5 degrees lower on Sunday across the southern Delmarva, closer to 10 degrees lower across the bulk of the area including metro Philly, but up to 15 degrees lower in the Poconos. KEY MESSAGE 2...A couple waves of low pressure may impact the region through the middle of next week with periods of wintry precipitation possible. A cold airmass is forecast to be in place on Monday into Tuesday as arctic high pressure from Canada builds over the Northeast. As of this afternoon, guidance continues to gain agreement that a couple separate systems will pass close to or over the area. The first will come on Monday into Monday evening with the second coming later Tuesday into Wednesday. Starting with the Monday system, weak low pressure is forecast to track east out of the Tennessee Valley along a stalled frontal boundary. With the strong, arctic high to the north, guidance keeps this system suppressed to the south while tracking off the coast near the Chesapeake region. Suppose a period of light snow may impact the area later Monday, but PoPs have continued to decrease to the 15-30% range. Trends in accumulations with this system continue to decline as well. As this system exits, another disturbance is forecast to ride along this boundary which will then impact the region Tuesday into Wednesday, though timing differences amongst guidance persists. With temperatures gradually warming on Tuesday into Tuesday night as a southerly flow regime sets-up a rain/snow mix may occur at the onset before changing over to plain rain into Tuesday night. PoPs during this period have increased, now in the 60-80% range. KEY MESSAGE 3...A significant warm-up is expected late next week. In wake of wintry systems earlier in the week, a significant warm-up is expected starting late next week into next weekend. GEFS and ECENS guidance are in pretty good agreement that positive height anomalies are forecast over the eastern CONUS with troughing over the western CONUS. CPC probabilities suggest that there is a 60-70% chance that temperatures will be above normal. Current forecast highs for late week are in the 50s and 60s. && .AVIATION /00Z SATURDAY THROUGH WEDNESDAY/... The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas. Tonight...VFR through this evening. Some low clouds and fog possible late especially around MIV and ACY north towards PNE and PHL. Southerly winds around 5 knots becoming light and variable to calm by mid evening. Low confidence. Saturday...Some fog/low clouds possible to start, otherwise VFR. Light and variable to calm winds, becoming south to southwest 4-8 knots. Low confidence regarding fog/low clouds. Outlook... Saturday night...VFR. Sunday...Sub-VFR possible with passing rain and snow showers, with best chance of these conditions occurring across KABE/KRDG/KTTN. Sunday night through Monday night...VFR most likely, slight chance sub-VFR with small chance of snow. Tuesday through Wednesday...Sub-VFR likely with brief period of snow changing to mixed precip and then rain by Tuesday night, with rain possibly persisting in Wednesday. && .MARINE... The conditions are expected to remain below Small Craft Advisory criteria through Saturday. Some fog and/or low clouds may develop late tonight and linger through Saturday, however this is low confidence. As of now, included a patchy fog mention. Outlook... Saturday night through Sunday...mainly below Small Craft Advisory conditions. Sunday night...SCA conditions possible with northwest winds gusting to 25 kts and waves up to 5 feet. Monday through Wednesday...sub-SCA likely, but slight chance of snow Monday becomes a chance of snow and rain Tuesday then rain likely Tuesday night into Wednesday, with vsby restrictions becoming likely. && .PHI WATCHES/WARNINGS/ADVISORIES... PA...None. NJ...None. DE...None. MD...None. MARINE...None. && DISCUSSION...Gorse/RCM AVIATION...Fitzsimmons/Gorse/RCM MARINE...Gorse/RCM
Hazardous Weather Outlook National Weather Service Mount Holly NJ 505 AM EST Fri Feb 27 2026 MDZ012-015-019-020-281015- Kent MD-Queen Annes-Talbot-Caroline- 505 AM EST Fri Feb 27 2026 This Hazardous Weather Outlook is for northeast Maryland. .DAY ONE...Today and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. MJL
The national radar mosaic for the moment the first event began.
1 dense fog. Local standard time, as filed.
Several hours of dense fog was observed at Wilmington Airport.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Delaware in 2026Every state in 2026This day in weather historyWarnings in Delaware, February 2026
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: 1315671.