Alert archive / Michigan / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 50, NWS Detroit, MI

July 4, 2001Wayne County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Jul 4, 2001, 3:42 PM EDT for Wayne County, Michigan. It was in force for 18 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 4, 2001, 3:42 PM EDT (19:42 UTC)
Expired: Jul 4, 2001, 4:00 PM EDT
In force: 18 min
Issued by: NWS Detroit, MI
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Wayne County, MI

The radar

The Detroit radar (KDTX), 49 km from the middle of the area, began a volume at 19:42 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.

What was reported inside it

Time	Report	Where	Remark
Jul 4, 3:48 PM EDT	Thunderstorm Wind 50 E	Grosse Pt Farms, MI	Power lines and tree blown down.
Jul 4, 3:50 PM EDT	Thunderstorm Wind 50 E	Detroit, MI	Large tree limbs blown down.
Jul 4, 3:50 PM EDT	Thunderstorm Wind 50 E	Grosse Pt Park, MI	Power lines blown down.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 4, 2:00 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 7.7 hours before the alert went out and 50 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1569 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 486 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.8

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 4, 3:22 PM EDT, 20 minutes earlier.

Area forecast discussion, Jul 4, 3:22 PM EDT, 20 minutes before

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In the hours before

Special weather statement, Jul 4, 11:08 AM EDT, 4 hours 34 minutes before

MIZ047>049-053>055-060>063-068>070-075-076-082-083-042000-

SEVERE WEATHER OUTLOOK FOR SOUTHEAST LOWER MICHIGAN
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1108 AM EDT WED JUL 4 2001

...SEVERE WEATHER POTENTIAL STATEMENT FOR SOUTHEAST MICHIGAN...

DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY.

SCATTERED THUNDERSTORMS WILL OCCUR THIS AFTERNOON ALONG AND SOUTH OF
I 69. THERE IS A SLIGHT CHANCE SOME OF THESE STORMS MAY BECOME
SEVERE. SPOTTER ACTIVATION MAY BE REQUIRED.

A COLD FRONT WILL SWEEP ACROSS SOUTHEAST LOWER MICHIGAN THIS
AFTERNOON BRINGING THE THREAT OF SHOWERS AND THUNDERSTORMS.
A NUMBER OF ATMOSPHERIC CONDITIONS NEED TO COME TOGETHER THIS
AFTERNOON FOR SEVERE THUNDERSTORMS TO DEVELOP. SHOULD THESE
CONDITIONS MATERIALIZE...THEN THE THREAT OF SCATTERED SEVERE
THUNDERSTORMS WILL EXIST FOR A PORTION OF SOUTHEAST LOWER MICHIGAN
THIS AFTERNOON.

THE MAIN THREAT FROM ANY SEVERE THUNDERSTORMS THAT DO DEVELOP WILL
BE WIND GUSTS TO 70 MPH AND HAIL TO ONE INCH IN DIAMETER. SEVERE
STORMS WILL MOVE SOUTHEAST AT 35 MPH. THE SEVERE THREAT WILL EXIST
ALONG AND SOUTH OF I 69 UNTIL 4 PM.

STAY TUNED TO NOAA WEATHER RADIO...OR YOUR FAVORITE MEDIA OUTLET...
FOR THE MOST UP TO DATE WEATHER INFORMATION.

OKEEFE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 4:07 AM EDT	Severe Thunderstorm Warning	DTX	Bay, Saginaw	38 min
Jul 4, 1:53 PM EDT	Severe Thunderstorm Warning	DTX	Livingston	52 min
Jul 4, 2:03 PM EDT	Severe Thunderstorm Warning	DTX	Lapeer	42 min
Jul 4, 2:16 PM EDT	Severe Thunderstorm Warning	DTX	Saint Clair	44 min
Jul 4, 2:58 PM EDT	Severe Thunderstorm Warning	DTX	Oakland	47 min
Jul 4, 3:06 PM EDT	Severe Thunderstorm Warning	DTX	Macomb, Wayne	39 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2001 Every severe thunderstorm warning in 2001

Sources

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