B757 crew was required to use emergency authority/authorized to avoid convective WX.

Attributes
ACN	443826
Time
Date	199907
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : downt
State Reference	FO
Altitude	msl single value : 35000
Environment
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : air carrier
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute airway : a300.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	443826
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	inflight encounter : weather non adherence : clearance other spatial deviation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency
Supplementary
Problem Areas	Weather
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

WX deviation. Approaching downt, a line of thunderstorms was directly on the airway (A300). Requested deviation to west up to 50 mi. ATC said they were unable due to traffic behind us on same route at FL350. We began to deviate west of course and ATC came back and gave us the clearance to deviate as requested. We deviated west approximately 30 mi and then returned to course.

Original NASA ASRS Text

Title: B757 CREW WAS REQUIRED TO USE EMER AUTH TO AVOID CONVECTIVE WX.

Narrative: WX DEV. APCHING DOWNT, A LINE OF TSTMS WAS DIRECTLY ON THE AIRWAY (A300). REQUESTED DEV TO W UP TO 50 MI. ATC SAID THEY WERE UNABLE DUE TO TFC BEHIND US ON SAME RTE AT FL350. WE BEGAN TO DEVIATE W OF COURSE AND ATC CAME BACK AND GAVE US THE CLRNC TO DEVIATE AS REQUESTED. WE DEVIATED W APPROX 30 MI AND THEN RETURNED TO COURSE.

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.