C182 pilot reported entering a small cell not depicted on the nexrad image displayed on the ads-B eq...

Attributes
ACN	1371302
Time
Date	201607
Local Time Of Day	1801-2400
Place
Locale Reference	ILM.Airport
State Reference	NC
Environment
Flight Conditions	IMC
Light	Dusk
Aircraft 1
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Person 1
Function	Single Pilot Pilot Flying
Qualification	Flight Crew Commercial Flight Crew Instrument
Experience	Flight Crew Last 90 Days 80 Flight Crew Total 3120 Flight Crew Type 1200
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Other / Unknown Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Weather / Turbulence

Narrative:

While deviating to avoid thunderstorms depicted as nexrad images on ads-B in equipment; I apparently flew into a cell that was not depicted in my flight path. This was apparently the result of latency of the images. While in the cell; the updrafts exceeded my ability to maintain altitude. My altitude increased from the assigned 7;000 MSL up to approximately 7;500 MSL. I advised ATC that I was unable to maintain assigned altitude due to the updrafts. ATC advised me that there were no other aircraft in the airspace near me; and that I could have a different altitude if desired. I was able to regain control after approximately 1 minute; and was able to complete the flight with no further operational problems.I believe that the problem could have been avoided if I had been deviating to the west side of the eastward-moving storms; rather than attempting to deviate further eastward. This may have provided some protection from the image latency issue.

Original NASA ASRS Text

Title: C182 pilot reported entering a small cell not depicted on the NexRad image displayed on the ADS-B equipment. An uncontrolled ascent of 500 feet occurred and ATC was advised.

Narrative: While deviating to avoid thunderstorms depicted as NexRad images on ADS-B In equipment; I apparently flew into a cell that was not depicted in my flight path. This was apparently the result of latency of the images. While in the cell; the updrafts exceeded my ability to maintain altitude. My altitude increased from the assigned 7;000 MSL up to approximately 7;500 MSL. I advised ATC that I was unable to maintain assigned altitude due to the updrafts. ATC advised me that there were no other aircraft in the airspace near me; and that I could have a different altitude if desired. I was able to regain control after approximately 1 minute; and was able to complete the flight with no further operational problems.I believe that the problem could have been avoided if I had been deviating to the west side of the eastward-moving storms; rather than attempting to deviate further eastward. This may have provided some protection from the image latency issue.

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.

C182 pilot reported entering a small cell not depicted on the nexrad image displayed on the ads-B equipment. An uncontrolled ascent of 500 feet occurred and ATC was advised.