An IMC B737-700 approaching oak received an egpws terrain 'pull up' warning and nearly simultaneously become VMC as a pull up was begun.

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Attributes
ACN	720658
Time
Date	200612
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : oak.airport
State Reference	CA
Altitude	msl single value : 5000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : nct.tracon
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 29 other
Flight Phase	descent : approach
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	720658
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	other spatial deviation
Resolutory Action	flight crew : exited adverse environment flight crew : became reoriented flight crew : took evasive action
Supplementary
Problem Areas	Airport Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

We received a terrain warning to pull up. As I started the terrain warning maneuver we popped out of the cloud we were in and I was able to see our position and any terrain in the area. We were at a safe altitude. At the time of the warning we were not painting any terrain on our display.

Original NASA ASRS Text

Title: AN IMC B737-700 APCHING OAK RECEIVED AN EGPWS TERRAIN 'PULL UP' WARNING AND NEARLY SIMULTANEOUSLY BECOME VMC AS A PULL UP WAS BEGUN.

Narrative: WE RECEIVED A TERRAIN WARNING TO PULL UP. AS I STARTED THE TERRAIN WARNING MANEUVER WE POPPED OUT OF THE CLOUD WE WERE IN AND I WAS ABLE TO SEE OUR POS AND ANY TERRAIN IN THE AREA. WE WERE AT A SAFE ALT. AT THE TIME OF THE WARNING WE WERE NOT PAINTING ANY TERRAIN ON OUR DISPLAY.

Data retrieved from NASA's ASRS site as of January 2009 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.