In the wake of the second blizzard of 2010, blowing and drifting snow from gusty winds will continue to block some roads and city streets in the Northeast on Thursday. The added weight of snow will also lead to additional roof collapses in parts of Pennsylvania, New Jersey, Delaware, Maryland, Virginia, West Virginia and Washington. Lake-effect snow will continue to produce heavy amounts downwind of the Great Lakes. Low temperatures will greatly limit melting in the wake of the recent storm from the Midwest to the Atlantic Coast. Sunshine will prevail over the southern Atlantic seaboard. But clouds are already increasing over the lower Mississippi Valley. A storm moving toward the Gulf Coast from Mexico is already bringing rain to much of Texas. Snow from the storm will fall from North Texas to the interior Deep South into the end of the week. The roots of yet another snowstorm for part of the Northeast will produce flurries in the Dakotas. This fast-moving low pressure may join with a similar storm farther north to spread snow through the Midwest on Sunday and the Northeast on Monday. In the Northwest, rain and snow will prevail. FOCUS: SNOWSTORM OF FEBRUARY 1969 On Feb. 9, 1969, a powerful storm along the Eastern seaboard brought in about one to two feet of snow from New Jersey to New England. Winds of up to 65 mph whipped the snow into huge drifts. The storm immobilized the entire region. 