Is it possible that you have a blowout somewhere on the head gasket that's allowing water out the exhaust and pressure from the combustion chamber into the cooling system, yet the piston rings are still tight enough to apparently keep water from making its way into the lower engine.
I cannot imagine any other way that water would "pour" from the exhaust and "shoot" from the radiator while cranking without starting.
12 Wrangler Sahara JK8 conversion, <10 miles (FOR SALE, $56,700)
01 WJ Limited, 4.7, 247, black on black, 157k miles (sold)
96 XJ Classic, 4.0, 242, black on grey, 267k miles (sold)
00 XJ Sport, 4.0, 242, fern green on grey, 76k miles (sold)
90 XJ Wagoneer, 4.0, 242, burgundy on tan, unknown mileage (sold)
97 ZJ Limited, 5.2, 249, black on black, 138k miles (wrecked 12/15/05)
98 ZJ Limited, 5.2, 249, burgundy on black, 197k miles (sold)