UPDATE: The map and data have been updated from NOHRS. We now have added to yesterday’s total with new overnight snows, bringing the CONUS coverage to 70.9%. KGMB-TV in Hawaii reports, that with snowfall on Mauna Kea, 49 out of 50 states have snow on the ground, with Florida the exception. -Anthony

Meanwhile, New York City declares a weather emergency due to snow.

Data from the National Weather Service National Operational Hydrologic Remote Sensing Center in Minnesota show that nearly 70 71% of the USA has snow cover.

January 12, 2011 Data:

Area Covered By Snow: 70.9% Area Covered Last Month: 35.1% Snow Depth Average: 6.9 in Minimum: 0.0 in Maximum: 895.5 in Std. Dev.: 11.3 in Snow Water Equivalent Average: 1.4 in Minimum: 0.0 in Maximum: 435.1 in Std. Dev.: 3.0 in

January 11, 2011 data:

Area Covered By Snow: 69.4% Area Covered Last Month: 33.1% Snow Depth Average: 6.9 in Minimum: 0.0 in Maximum: 897.2 in Std. Dev.: 11.4 in

The map above is done from snow reports from COOP stations and other observers. Here’s the map done by satellite:

The 70% value may be exceeded tomorrow as the area around Washington DC has picked up a couple of inches of snow, which is shown as no snow cover in Jan 11 maps above. See this from NWS Baltimore/Washington:

At the time of this post, the Northeastern USA was getting hammered with significant snowfall:

Earlier today, NYC mayor Bloomberg declared a snow emergency:

This from Notify NYC, a city email messaging service:

The Mayor has issued a Weather Emergency Declaration for NYC. The public is urged to avoid all unnecessary driving for the duration of the storm and use public transportation. For info on MTA service visit http://www.mta.info. Any vehicle found blocking roadways or impeding ability to plow streets will be towed at owner’s expense. Alternate Side Parking, payment at parking meters, and garbage collection are suspended citywide until further notice.

The NWS has issued this:

URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE NEW YORK NY 1054 PM EST TUE JAN 11 2011 ...WINTER STORM TO IMPACT THE AREA TONIGHT AND WEDNESDAY... NJZ002-004-006-103>108-NYZ072>075-176-178-121200- /O.CON.KOKX.WS.W.0002.000000T0000Z-110112T2300Z/ WESTERN PASSAIC-EASTERN PASSAIC-HUDSON-WESTERN BERGEN- EASTERN BERGEN-WESTERN ESSEX-EASTERN ESSEX-WESTERN UNION- EASTERN UNION-NEW YORK (MANHATTAN)-BRONX-RICHMOND (STATEN ISLAND)- KINGS (BROOKLYN)-NORTHERN QUEENS-SOUTHERN QUEENS- 1054 PM EST TUE JAN 11 2011 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM EST WEDNESDAY... A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM EST WEDNESDAY. * LOCATIONS...NEW YORK CITY...AND NORTHEAST NEW JERSEY. * HAZARDS...SNOW...HEAVY AT TIMES. * ACCUMULATIONS...8 TO 12 INCHES...WITH LOCALLY HIGHER AMOUNTS POSSIBLE. * WINDS...GUSTS 20 TO 25 MPH. * VISIBILITIES...LESS THAN 1/4 MILE AT TIMES. * TIMING...HEAVIEST SNOW OCCURS AFTER MIDNIGHT TONIGHT THROUGH DAYBREAK WEDNESDAY. * IMPACTS...HAZARDOUS TRAVEL TONIGHT AND THROUGH THE DAY WEDNESDAY. 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.

Looks like a fun day tomorrow in NYC.

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