(Updated at 4:30 p.m.) The Winter Storm Watch issued for Arlington and the rest of the D.C. area Sunday afternoon has been upgraded to a Winter Storm Warning.

As of Monday morning, forecasters said 6-10 inches of snow may fall overnight. The snow is expected to begin Monday afternoon and wrap up Tuesday morning.

From the National Weather Service:

… WINTER STORM WARNING NOW IN EFFECT UNTIL NOON EST TUESDAY…

* PRECIPITATION TYPE… SNOW.
* ACCUMULATIONS… 6 TO 10 INCHES… WITH LOCALLY HIGHER AMOUNTS EXPECTED ACROSS PORTIONS OF LOWER SOUTHERN MARYLAND.
* TIMING… SNOW WILL INCREASE IN INTENSITY THROUGH THE EVENING HOURS. HEAVIEST SNOW IS EXPECTED LATE TONIGHT INTO EARLY TUESDAY MORNING.
* TEMPERATURES… MID TEENS TO LOWER 20S.
* WINDS… EAST 5 TO 10 MPH.
* IMPACTS… BEGINNING THIS EVENING… ROADS WILL BECOME SNOW COVERED AND SLIPPERY WITH VISIBILITIES BEING REDUCED TO ONE HALF MILE OR LESS AT TIMES. THE COMBINATION OF SNOW COVERED ROADS AND LOW VISIBILITY WILL MAKE TRAVELING DANGEROUS.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST TRAVEL… KEEP AN EXTRA FLASHLIGHT… FOOD… AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY.