Alert archive / Michigan / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 118, NWS Detroit, MI

July 6, 2004Washtenaw County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Jul 6, 2004, 9:05 PM EDT for Washtenaw County, Michigan. It was in force for 70 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 6, 2004, 9:05 PM EDT (01:05 UTC)
Expired
Jul 6, 2004, 10:15 PM EDT
In force
70 min
Issued by
NWS Detroit, MI
Area
Counties, with a storm outline in the text

County Washtenaw County, MI

The radar

The Detroit radar (KDTX), 58 km from the middle of the area, began a volume at 01:05 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 6, 6:15 PM EDTTornado WatchSPC7 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 1.1 hours before the alert went out and 62 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, Detroit, MI at 00:00Z on 2004-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 590 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, Detroit, MI at 00:00Z on 2004-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.193958Sfc1 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
590 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
1353 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
185 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jul 6, 3:52 PM EDT, 5 hours 13 minutes earlier.

Area forecast discussion, Jul 6, 3:52 PM EDT, 5 hours 13 minutes before
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Hazardous weather outlook, Jul 6, 6:20 PM EDT, 2 hours 45 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
620 PM EDT TUE JUL 6 2004

MIZ047>049-053>055-060>063-068>070-075-076-082-083-071200-
BAY-GENESEE-HURON-LAPEER-LENAWEE-LIVINGSTON-MACOMB-MIDLAND-MONROE-
OAKLAND-SAGINAW-SANILAC-SHIAWASSEE-ST. CLAIR-TUSCOLA-WASHTENAW-
WAYNE-
620 PM EDT TUE JUL 6 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST MICHIGAN.

.DAY ONE...TONIGHT

TORNADO WATCH 582 HAS BEEN ISSUED UNTIL 1 AM EDT FOR ALL OF
SOUTHEAST MICHIGAN.

THERE IS A CHANCE OF THUNDERSTORMS THIS EVENING. THUNDERSTORMS ARE
LIKELY AFTER MIDNIGHT. THERE IS A CHANCE OF SEVERE WEATHER WITH
THESE STORMS SOUTH OF INTERSTATE 69... AND A SLIGHT CHANCE TO THE
NORTH. THE BEST CHANCE OF SEVERE WEATHER WILL BE BETWEEN 7 PM AND 1
AM TONIGHT. THE STRONGEST THUNDERSTORMS WILL BE CAPABLE OF WIND
GUSTS TO 70 MPH AND HAIL TO ONE INCH IN DIAMETER...AND POSSIBLY AN
ISOLATED TORNADO. ALL THUNDERSTORMS WILL BE CAPABLE OF PRODUCING
VERY HEAVY RAIN AND FREQUENT LIGHTNING. THUNDERSTORMS WILL MOVE
NORTHEAST AT 25 MPH.

LOW PRESSURE WILL MOVE ACROSS NORTH CENTRAL LOWER MICHIGAN TONIGHT.
THIS LOW WILL DRAG A WEAK COLD FRONT INTO SOUTHWEST LOWER MICHIGAN
LATE THIS EVENING. MOIST AND UNSTABLE AIR WILL LIFT INTO THE AREA
AHEAD OF THIS FRONT. THIS AIRMASS WILL TRIGGER THUNDERSTORMS...
ESPECIALLY OVERNIGHT.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH TUESDAY

THE CHANCE OF THUNDERSTORMS WILL PERSIST INTO WEDNESDAY AS THE
AFOREMENTIONED COLD FRONT MOVES THROUGH THE AREA. SEVERE WEATHER IS
NOT EXPECTED AT THIS TIME.

THEREAFTER...THE NEXT CHANCE FOR THUNDERSTORMS WILL THEN HOLD OFF
UNTIL NEXT MONDAY AND TUESDAY AS A SERIES OF UPPER LEVEL
DISTURBANCES MOVE ACROSS THE AREA.

.SPOTTER INFORMATION STATEMENT...

DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGER.

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING.

CONSIDINE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 9:43 PM EDTSevere Thunderstorm WarningDTXGenesee32 min
Jul 6, 10:05 PM EDTSevere Thunderstorm WarningDTXLapeer55 min
Jul 6, 10:30 PM EDTSevere Thunderstorm WarningDTXOakland30 min
Jul 6, 11:10 PM EDTSpecial Marine WarningDTX65 min
Jul 6, 11:10 PM EDTSpecial Marine WarningDTX65 min
Jul 7, 12:08 AM EDTSevere Thunderstorm WarningDTXLivingston52 min
Jul 7, 12:24 AM EDTSevere Thunderstorm WarningDTXLenawee66 min
Jul 7, 1:19 AM EDTSpecial Marine WarningDTX116 min
Jul 7, 1:19 AM EDTSpecial Marine WarningDTX116 min
Jul 7, 1:59 AM EDTSpecial Marine WarningDTX61 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2004Every severe thunderstorm warning in 2004

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.