Alert archive / Michigan / Winter Storm Watches in 2012

Winter Storm Watch 2, NWS Detroit, MI

December 25, 20125 counties in Michigan

NWS Detroit, MI issued this winter storm watch at Dec 25, 2012, 3:54 AM EST for 5 counties in Michigan. It took effect at Dec 26, 2012, 12:00 PM EST. It was in force for .

The area

The counties it named.

The facts

Issued
Dec 25, 2012, 3:54 AM EST (08:54 UTC)
In effect from
Dec 26, 2012, 12:00 PM EST
Expired
Dec 25, 2012, 4:03 PM EST
In force
Issued by
NWS Detroit, MI

Counties Lenawee County, MI, Macomb County, MI, Monroe County, MI, Saint Clair County, MI, Wayne County, MI

The radar

The Detroit radar (KDTX), 43 km from the middle of the area, began a volume at 08:55 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 8.9 hours before the alert went out and 327 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Cncnati-Daytn, OH at 00:00Z on 2012-12-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 00:00Z on 2012-12-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 61 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
446 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
61 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter storm watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Detroit, MI wrote its last area forecast discussion before this winter storm watch went out at Dec 25, 3:51 AM EST, 3 minutes earlier.

Area forecast discussion, Dec 25, 3:51 AM EST, 3 minutes before
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Hazardous weather outlook, Dec 24, 4:00 PM EST, 11 hours 54 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
400 PM EST MON DEC 24 2012

MIZ047>049-053>055-060>063-068>070-075-076-082-083-250915-
MIDLAND-BAY-HURON-SAGINAW-TUSCOLA-SANILAC-SHIAWASSEE-GENESEE-LAPEER-
ST. CLAIR-LIVINGSTON-OAKLAND-MACOMB-WASHTENAW-WAYNE-LENAWEE-MONROE-
400 PM EST MON DEC 24 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST MICHIGAN.

.DAY ONE... TONIGHT

LIGHT SNOW WILL SPREAD OVER THE REGION DURING THE EVENING. TOTAL
SNOW ACCUMULATION WILL BE AN INCH OR LESS TONIGHT BUT A BURST OF
HEAVIER SNOW SHOWERS WILL REDUCE VISIBILITY FOR MOTORISTS AT TIMES
BEFORE THE SNOW ENDS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

A WINTER STORM WILL IMPACT SOUTHEAST MICHIGAN WEDNESDAY THROUGH
WEDNESDAY NIGHT. THE MAIN CONCERN WITH THIS SYSTEM WILL BE WITH
DIFFICULTIES FOR THOSE PLANNING TRAVEL THE DAY AFTER CHRISTMAS. THE
RESPONSIBLE LOW PRESSURE SYSTEM WILL DEVELOP FROM THE WESTERN GULF
COAST TUESDAY AND DEEPEN INTO THE OHIO VALLEY AND MID ATLANTIC
STATES BY LATE WEDNESDAY. BASED ON THE LOW MAKING IT INTO SOUTHERN
OHIO...THE LATEST WEATHER DATA INDICATES A 3 TO 6 INCH SNOWFALL...
WITH THE HIGHEST TOTALS OCCURRING ACROSS EASTERN AREAS...OR ALONG A
MONROE...DETROIT...SANDUSKY LINE. NORTHEAST WINDS OF 20 TO 30 MPH
WILL ALSO EXACERBATE TRAVEL DIFFICULTIES...AS BLOWING AND DRIFTING
SNOW COULD REDUCE VISIBILITY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT.

LCZ422-423-460-LEZ444-LHZ361>363-421-422-441>443-462>464-250915-
ST. CLAIR RIVER-DETROIT RIVER-LAKE ST. CLAIR-
MICHIGAN WATERS OF LAKE ERIE FROM DETROIT RIVER TO NORTH CAPE MI-
LAKE HURON FROM 5NM EAST OF MACKINAC BRIDGE TO PRESQUE ISLE LT
BEYOND 5 NM OFF SHORE-
LAKE HURON FROM PRESQUE ISLE LIGHT TO STURGEON POINT MI BEYOND 5NM
OFF SHORE-
LAKE HURON FROM STURGEON POINT TO ALABASTER MI BEYOND 5NM OFF SHORE-
OUTER SAGINAW BAY SW OF ALABASTER TO PORT AUSTIN MI TO INNER SAGINAW
BAY-INNER SAGINAW BAY SW OF POINT AU GRES TO BAY PORT MI-
PORT AUSTIN TO HARBOR BEACH MI-HARBOR BEACH TO PORT SANILAC MI-
PORT SANILAC TO PORT HURON MI-
LAKE HURON FROM PORT AUSTIN TO HARBOR BEACH BEYOND 5NM OFF SHORE-
LAKE HURON FROM HARBOR BEACH TO PORT SANILAC BEYOND 5NM OFF SHORE-
LAKE HURON FROM PORT SANILAC TO PORT HURON BEYOND 5NM OFF SHORE-
400 PM EST MON DEC 24 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE ERIE...LAKE
HURON AND LAKE ST CLAIR.

.DAY ONE... TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

A STRONG LOW PRESSURE SYSTEM IS EXPECTED TO DEVELOP NEAR THE GULF
COAST TUESDAY AND MOVE TOWARD THE GREAT LAKES WEDNESDAY INTO
THURSDAY. NORTHEAST WINDS INCREASING TO 30 KNOTS ON WEDNESDAY WILL
NECESSITATE SMALL CRAFT ADVISORIES FOR THE NEARSHORE WATERS OF
SOUTHERN LAKE HURON. SNOW WILL ALSO SPREAD OVER THE SOUTHERN LAKES
REGION AND LIKELY PRESENT VISIBILITY RESTRICTIONS FOR MARINE
INTERESTS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT.

BT

YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE
AT WWW.WEATHER.GOV/DETROIT (ALL LOWER CASE).

The office that day

Everything else NWS Detroit, MI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 25, 3:38 AM ESTSmall Craft AdvisoryDTX3 days
Dec 25, 3:50 PM ESTGale WarningDTX30 hr
Dec 25, 4:03 PM ESTWinter Weather AdvisoryDTXGenesee, Huron, Lapeer, Lenawee, Livingston, Macomb and 8 more38 hr

Nearby

Winter Storm Watches in Michigan, 2012Every winter storm watch in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.