Meteorological history Tropical Storm Andrea (2013)

map plotting track , intensity of storm, according saffir–simpson scale

at end of may 2013, broad , diffuse cyclonic disturbance developed on eastern mexico , northern central america, incorporating remnants of eastern pacific hurricane barbara. tropical wave approached east, inverted trough developed on northern edge of active region on june 2, setting stage formation of weak surface low pressure system on southern gulf of mexico next day. national hurricane center (nhc) began monitoring system in tropical weather outlooks, bulletins issued every 6 hours regarding probability of tropical cyclone formation within 48 hours. nearby upper trough created unfavorable conditions tropical cyclogenesis, subjecting low wind shear , abundant dry air kept indistinct , disorganized. on june 5, environment became less hostile, , system began improve in structure.

a weakening tropical storm andrea on carolinas on june 7

on june 5, hurricane hunters flight found closed center , winds of 40 mph (65 km/h). in response, nhc initiated advisories on tropical storm andrea later day, while centered 310 miles (500 km) southwest of st. petersburg, florida. due unfavorable conditions, significant strengthening considered unlikely. on june 6, deep convection displaced east , southeast of center result of wind shear 29 mph (47 km/h). despite this, andrea intensified attain peak winds of 65 mph (100 km/h) @ 1200 utc day. thereafter, unfavorable conditions, including dry air entrainment caused storm weaken slightly. @ 2200 utc on june 6, andrea made landfall in dixie county, florida 10 miles (15 km) south of steinhatchee. simultaneously, storm attained minimum barometric pressure of 992 mbar (29.3 inhg).

after moving inland on june 6, nhc noted extratropical transition within 24 hours , occur sooner if convective structure not improve. later on june 7, of convection became displaced northwest due dry air. around time, storm began accelerating northeastward @ 26 mph (42 km/h) due approaching mid-latitude trough. based on ground observations , doppler radar, system transitioned extratropical cyclone @ 1800 utc on june 7, while located on northeastern south carolina. remaining thunderstorms around andrea became indistinguishable associated frontal zone on north carolina. due policy created in response hurricane sandy, nhc continued issue advisories on remnants of andrea remained threat east coast of united states. on june 8, moved rapidly northeastward across mid-atlantic , new england. because gale-force winds located southeast of center, nhc ceased advisories on remnants of andrea. upon reaching gulf of maine, extratropical remnants of andrea absorbed extratropical low pressure area around 0000 utc on june 9.