M20 pilot reported encountering an updraft which caused him to climb into tpa class B airspace.

Attributes
ACN	1471074
Time
Date	201708
Local Time Of Day	1201-1800
Place
Locale Reference	TPA.Airport
State Reference	FL
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Make Model Name	M-20 F Executive 21
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Direct
Flight Plan	None
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument Flight Crew Private Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 0 Flight Crew Total 2800 Flight Crew Type 2000
Events
Anomaly	Airspace Violation All Types Deviation - Procedural FAR Inflight Event / Encounter Weather / Turbulence

Narrative:

I had not flown for several months and was getting practice in. As I tried to get to bkv I found myself hemmed in by building cumulonimbus; rain; and thunderstorm activity. I was unable to make bkv and updrafts and cloud tops pushed me above the class B veil beyond 6;000 ft to 6;400 about. I had relied on my garmin weather in cockpit; but it was not depicting actual conditions. I will not rely on this instrument again.

Original NASA ASRS Text

Title: M20 pilot reported encountering an updraft which caused him to climb into TPA Class B airspace.

Narrative: I had not flown for several months and was getting practice in. As I tried to get to BKV I found myself hemmed in by building cumulonimbus; rain; and thunderstorm activity. I was unable to make BKV and updrafts and cloud tops pushed me above the class B veil beyond 6;000 ft to 6;400 about. I had relied on my Garmin weather in cockpit; but it was not depicting actual conditions. I will not rely on this instrument again.

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.