The Good Friday Severe Weather Outbreak of April 10, 2009

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

MESOSCALE DISCUSSION 0426 NWS STORM PREDICTION CENTER NORMAN OK 0704 AM CDT FRI APR 10 2009 AREAS AFFECTED...NORTH GA INTO EXTREME WESTERN PORTIONS OF NC/SC CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY VALID 101204Z - 101330Z ISOLATED DAMAGING WIND/HAIL THREAT MAY CONTINUE OVER THE NEXT FEW HOURS MAINLY ACROSS FAR NORTHERN GA AND PERHAPS INTO THE EXTREME WESTERN PORTIONS OF NC/SC. A WATCH IS NOT EXPECTED AT THIS TIME. SMALL SCALE/75 MILE LONG MCS/BOW ECHO CONTINUES TO RACE EAST-NORTHEASTWARD AT AROUND 45 KT INTO NORTHWEST GA TOWARD THE I-75 CORRIDOR AS OF 12Z. THIS MCS HAS AN UPSTREAM HISTORY OF ISOLATED WIND DAMAGE/HAIL...AND A SIMILAR THREAT MAY CONTINUE OVER THE NEXT FEW HOURS PRIMARILY ACROSS THE NORTH GA AREAS NORTH OF I-85. AIDED BY A MID LEVEL IMPULSE...THIS MCS IS GENERALLY BEING FED VIA AN INCREASINGLY MOIST/UNSTABLE AIRMASS FROM THE SOUTHWEST. ORGANIZED NATURE OF THE MCS WILL CONTINUE TO SUPPORT A CONTINUED SEVERE RISK IN THE SHORT TERM...ALTHOUGH A PRE-MCS TREND FOR COOLING SURFACE TEMPERATURES IMPLIES THAT THIS SYSTEM MAY BECOME INCREASINGLY ROOTED ABOVE A COOL NEAR-SURFACE LAYER. WITH THE EXPECTATION THAT THE SEVERE THREAT WILL REMAIN FAIRLY ISOLATED THIS MORNING...A WATCH IS NOT CURRENTLY ANTICIPATED. ..GUYER.. 04/10/2009 ATTN...WFO...GSP...MRX...FFC...BMX... LAT...LON 35018499 35118404 34938296 34378303 33748436 33698586 34358545 35018499