Alert archive / Michigan / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 21, NWS Detroit, MI

April 20, 2003Saint Clair County, Sanilac County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Apr 20, 2003, 5:57 PM EDT for Saint Clair County, Sanilac County, Michigan. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 20, 2003, 5:57 PM EDT (21:57 UTC)
Expired: Apr 20, 2003, 6:45 PM EDT
In force: 48 min
Issued by: NWS Detroit, MI
Area: Counties, with a storm outline in the text

Counties Saint Clair County, MI, Sanilac County, MI

The radar

The Detroit radar (KDTX), 69 km from the middle of the area, began a volume at 21:59 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.

Issued	Product	Office	Lasted
Apr 20, 3:25 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 10.0 hours before the alert went out and 65 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: 41 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 1190 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 177 m²/s²
0-3 km storm-relative helicity: 171 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

604 
WUUS53 KDTX 202157
SVRDTX
MIC147-151-202245-

BULLETIN - EAS ACTIVATION/IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
556 PM EDT SUN APR 20 2003

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SANILAC COUNTY IN SOUTHEAST MICHIGAN
  ST. CLAIR COUNTY IN SOUTHEAST MICHIGAN

* UNTIL 645 PM EDT

* AT 556 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 33 MILES WEST OF YALE TO 20 MILES
  SOUTHWEST OF YALE...MOVING NORTHEAST AT 60 MPH. THIS LINE OF SEVERE
  THUNDERSTORMS HAS THE POTENTIAL OF PRODUCING WINDS UP TO 70 MPH AND
  HAIL UP TO ONE INCH IN DIAMETER.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  YALE AT 625 PM EDT
  MELVIN AT 625 PM EDT

LAT...LON 4298 8293 4294 8274 4270 8259 4278 8246
          4341 8266 4339 8297

$$

SF DWD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 2:48 PM EDT	Severe Thunderstorm Warning	DTX	Oakland	27 min
Apr 20, 2:52 PM EDT	Severe Thunderstorm Warning	DTX	Washtenaw	23 min
Apr 20, 3:05 PM EDT	Severe Thunderstorm Warning	DTX	Wayne	40 min
Apr 20, 3:18 PM EDT	Severe Thunderstorm Warning	DTX	Oakland	42 min
Apr 20, 3:35 PM EDT	Severe Thunderstorm Warning	DTX	Macomb	40 min
Apr 20, 3:47 PM EDT	Special Marine Warning	DTX		73 min
Apr 20, 3:47 PM EDT	Special Marine Warning	DTX		73 min
Apr 20, 3:54 PM EDT	Severe Thunderstorm Warning	DTX	Saint Clair	51 min
Apr 20, 4:37 PM EDT	Severe Thunderstorm Warning	DTX	Livingston, Washtenaw	53 min
Apr 20, 5:07 PM EDT	Severe Thunderstorm Warning	DTX	Oakland	38 min
Apr 20, 5:16 PM EDT	Special Marine Warning	DTX		44 min
Apr 20, 5:35 PM EDT	Severe Thunderstorm Warning	DTX	Lapeer	55 min
Apr 20, 5:43 PM EDT	Severe Thunderstorm Warning	DTX	Macomb, Oakland, Wayne	47 min
Apr 20, 5:52 PM EDT	Special Marine Warning	DTX		38 min
Apr 20, 5:52 PM EDT	Special Marine Warning	DTX		38 min
Apr 20, 6:01 PM EDT	Special Marine Warning	DTX		59 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2003 Every severe thunderstorm warning in 2003

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.