Narrative:

I was traveling with another pilot on a VFR flight from massachusetts to reedsville PA.we stopped at kavp because the weather was deteriorating along the route. After sitting for an hour or so; the weather was clearing from west to east. A call to flight service and some brightening skies had me believing we could follow the river south at 1;500 [feet] AGL to our destination in MVFR conditions. Once airborne; the plan looked good. But 10 miles out; the controller said that some rain was ahead. With visibility better than 5; we slowed down and pushed ahead. Once in the rain; the visibility deteriorated quickly with fog developing below us. Once we lost sight of the ground; I climbed the plane on the gauges using the terrain feature on the GPS to avoid CFIT. Once in the climb; I asked for a pop-up IFR [flight plan]. [I advised ATC]. I proceeded to an uneventful instrument approach into our destination.scary few moments I wish not to relive. As soon as ATC mentioned rain ahead; I should have turned around. I did not. As soon as I reduce speed and dropped a few hundred feet to see ahead; I should have turned around; I did not. I should not have relied on the 'superior' abilities and decision making of the other pilot because I was PIC. I did not take action until the terrain warning system showed red to my left and right leaving me one route out. Never again.contributing physiological factors for me included: pressure to make a dinner meeting; another pilot on board who was more confident than me about 'scud' running and a nice weather report from flight service briefer. My gut said to stay on the ground but I let the above cloud my judgment. A classic scenario that has killed many pilots. Glad to be alive to write this report.

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Original NASA ASRS Text

Title: C180 pilot reported entering Instrument Meteorological Conditions while flying VFR.

Narrative: I was traveling with another pilot on a VFR flight from Massachusetts to Reedsville PA.We stopped at KAVP because the weather was deteriorating along the route. After sitting for an hour or so; the weather was clearing from west to east. A call to flight service and some brightening skies had me believing we could follow the river south at 1;500 [feet] AGL to our destination in MVFR conditions. Once airborne; the plan looked good. But 10 miles out; the controller said that some rain was ahead. With visibility better than 5; we slowed down and pushed ahead. Once in the rain; the visibility deteriorated quickly with fog developing below us. Once we lost sight of the ground; I climbed the plane on the gauges using the terrain feature on the GPS to avoid CFIT. Once in the climb; I asked for a pop-up IFR [flight plan]. [I advised ATC]. I proceeded to an uneventful instrument approach into our destination.Scary few moments I wish not to relive. As soon as ATC mentioned rain ahead; I should have turned around. I did not. As soon as I reduce speed and dropped a few hundred feet to see ahead; I should have turned around; I did not. I should not have relied on the 'superior' abilities and decision making of the other pilot because I was PIC. I did not take action until the terrain warning system showed red to my left and right leaving me one route out. Never again.Contributing physiological factors for me included: pressure to make a dinner meeting; another pilot on board who was more confident than me about 'scud' running and a nice weather report from Flight Service briefer. My gut said to stay on the ground but I let the above cloud my judgment. A classic scenario that has killed many pilots. Glad to be alive to write this report.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.