Flight crew of medium large transport at FL240 hemmed in by thunderstorm had to enter warning area to avoid the thunderstorm, squawked 7700 and proceeded while descending per clearance. Later was advised they would have avoided the hot area had they stayed at FL240.

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Attributes
ACN	184191
Time
Date	199107
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : omn
State Reference	FL
Altitude	msl bound lower : 18000 msl bound upper : 24000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 180 flight time total : 6500 flight time type : 650
ASRS Report	184191
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 2500 flight time type : 400
ASRS Report	184190
Events
Anomaly	inflight encounter : weather non adherence : clearance non adherence : far other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited adverse environment none taken : anomaly accepted other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flight was from atl to dab via J45 to omn then dab. There was an area of heavy thunderstorms west of craig and also to the southeast. On WX radar it appeared that J45 would be open south of craig with only minor deviations. However, when we got to craig we were not able to proceed on J45 due to the WX. We asked jax center if we could continue on to the southeast to get around the line of thunderstorms and were told we could. This was at FL240. As we were deviating we asked for and were given a descent in an attempt to get under the WX. At about this time we were also told to go no further than the omn 360 degree radial due to an active warning area. We were unable to comply with this restriction due to the WX extending further south than we expected. We were forced to continue on which took us into the warning area. We squawked 7700 and were then low enough to proceed direct to omn. If we had been advised the warning area was only 'hot' to FL230 we could have stayed at that altitude and continued our deviation. Instead we were advised of the 360 degree radial restriction well into our deviation and descent but due to our proximity to the WX we were already committed to our southeast deviation.

Original NASA ASRS Text

Title: FLC OF MLG AT FL240 HEMMED IN BY TSTM HAD TO ENTER WARNING AREA TO AVOID THE TSTM, SQUAWKED 7700 AND PROCEEDED WHILE DSNDING PER CLRNC. LATER WAS ADVISED THEY WOULD HAVE AVOIDED THE HOT AREA HAD THEY STAYED AT FL240.

Narrative: FLT WAS FROM ATL TO DAB VIA J45 TO OMN THEN DAB. THERE WAS AN AREA OF HVY TSTMS W OF CRAIG AND ALSO TO THE SE. ON WX RADAR IT APPEARED THAT J45 WOULD BE OPEN S OF CRAIG WITH ONLY MINOR DEVS. HOWEVER, WHEN WE GOT TO CRAIG WE WERE NOT ABLE TO PROCEED ON J45 DUE TO THE WX. WE ASKED JAX CENTER IF WE COULD CONTINUE ON TO THE SE TO GET AROUND THE LINE OF TSTMS AND WERE TOLD WE COULD. THIS WAS AT FL240. AS WE WERE DEVIATING WE ASKED FOR AND WERE GIVEN A DSCNT IN AN ATTEMPT TO GET UNDER THE WX. AT ABOUT THIS TIME WE WERE ALSO TOLD TO GO NO FURTHER THAN THE OMN 360 DEG RADIAL DUE TO AN ACTIVE WARNING AREA. WE WERE UNABLE TO COMPLY WITH THIS RESTRICTION DUE TO THE WX EXTENDING FURTHER S THAN WE EXPECTED. WE WERE FORCED TO CONTINUE ON WHICH TOOK US INTO THE WARNING AREA. WE SQUAWKED 7700 AND WERE THEN LOW ENOUGH TO PROCEED DIRECT TO OMN. IF WE HAD BEEN ADVISED THE WARNING AREA WAS ONLY 'HOT' TO FL230 WE COULD HAVE STAYED AT THAT ALT AND CONTINUED OUR DEV. INSTEAD WE WERE ADVISED OF THE 360 DEG RADIAL RESTRICTION WELL INTO OUR DEV AND DSCNT BUT DUE TO OUR PROX TO THE WX WE WERE ALREADY COMMITTED TO OUR SE DEV.

Data retrieved from NASA's ASRS site as of July 2007 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.