Alert archive / Michigan / Tornado Warnings in 2008

Tornado Warning 2, NWS Detroit, MI

April 11, 2008Shiawassee County, Michigan

NWS Detroit, MI issued this tornado warning at Apr 11, 2008, 5:53 PM EDT for Shiawassee County, Michigan. It was in force for 30 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 11, 2008, 5:53 PM EDT (21:53 UTC)
Expired: Apr 11, 2008, 6:23 PM EDT
In force: 30 min
Issued by: NWS Detroit, MI
Area: Storm-based polygon

County Shiawassee County, MI

The radar

The Detroit radar (KDTX), 61 km from the middle of the area, began a volume at 21:54 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
Apr 11, 6:00 PM EDT	HAIL 0.88	3 N Owosso, MI
Apr 11, 6:14 PM EDT	HAIL 1.75	3 Sw New Lothrop, MI	DURAND AND ALLEN RD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 11, 12:58 PM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 9.9 hours before the alert went out and 63 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 462 m above ground
0-6 km bulk shear: 84 kt
0-1 km storm-relative helicity: 448 m²/s²
0-3 km storm-relative helicity: 382 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.

000 
WFUS53 KDTX 112153
TORDTX
MIC155-112300-
/O.NEW.KDTX.TO.W.0002.080411T2153Z-080411T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
553 PM EDT FRI APR 11 2008

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN SHIAWASSEE COUNTY IN SOUTHEAST MICHIGAN

* UNTIL 700 PM EDT

* AT 550 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
  OWOSSO..MOVING NORTHEAST AT 45 MPH.

* THE TORNADO WILL BE NEAR...
  OWOSSO BY 600 PM EDT...
  JUDDVILLE BY 610 PM EDT...
  NEW LOTHROP BY 615 PM EDT...

THE WARNING INCLUDES AREAS SURROUNDING THESE LOCATIONS...
  OWOSSO...             NEW LOTHROP...        LENNON...
  HENDERSON...          CORUNNA...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY.

SEEK SHELTER IN THE INNERMOST PORTION OF THE BUILDING...ON THE LOWEST
FLOOR. GET TO A BASEMENT IF ONE IS AVAILABLE...AND AVOID WINDOWS.
PROTECT YOUR BODY FROM FLYING DEBRIS WITH CUSHIONS OR PILLOWS.

LAT...LON 4286 8426 4304 8436 4313 8426 4313 8393
      4307 8393 4304 8394 4304 8393 4296 8392

$$

/

2 follow-up statements

000 
WWUS53 KDTX 112209
SVSDTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
609 PM EDT FRI APR 11 2008

MIC155-112300-
/O.CON.KDTX.TO.W.0002.000000T0000Z-080411T2300Z/
SHIAWASSEE MI-
609 PM EDT FRI APR 11 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR
NORTHEASTERN SHIAWASSEE COUNTY...

AT 607 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS STORM WAS
LOCATED NEAR NEW LOTHROP...MOVING NORTHEAST AT 45 MPH.

THE WARNING INCLUDES AREAS SURROUNDING THESE LOCATIONS...
  NEW LOTHROP...

PEOPLE IN THE PROJECTED PATH OF THE TORNADO SHOULD SEEK SHELTER
IMMEDIATELY. MOVE INSIDE A BASEMENT...OR A SMALL INTERIOR ROOM ON THE
LOWEST FLOOR.

THIS STORM IS ALSO CAPABLE OF PRODUCING WIND GUSTS OVER 65 MPH AND
HAIL GREATER THAN ONE INCH IN DIAMETER.

LAT...LON 4301 8406 4305 8415 4313 8416 4313 8394
      4309 8394 4307 8393 4304 8394 4304 8393

$$

000 
WWUS53 KDTX 112223
SVSDTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
623 PM EDT FRI APR 11 2008

MIC155-112233-
/O.CAN.KDTX.TO.W.0002.000000T0000Z-080411T2300Z/
SHIAWASSEE MI-
623 PM EDT FRI APR 11 2008

...THE TORNADO WARNING FOR NORTHEASTERN SHIAWASSEE COUNTY IS
CANCELLED...

NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE SEVERE THUNDERSTORM
THAT PROMPTED THE WARNING EXITED THE COUNTY. THEREFORE...THE WARNING 
HAS BEEN CANCELLED.

RADAR INDICATED THAT HEAVY RAIN...SMALL HAIL...AND GUSTY WINDS WERE
STILL POSSIBLE FROM THESE THUNDERSTORMS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY EVENING FOR
SOUTHEAST MICHIGAN.

LAT...LON 4301 8406 4305 8415 4313 8416 4313 8394
      4309 8394 4307 8393 4304 8394 4304 8393

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 2:52 PM EDT	Severe Thunderstorm Warning	DTX	Saginaw, Shiawassee	68 min
Apr 11, 3:55 PM EDT	Severe Thunderstorm Warning	DTX	Genesee, Saginaw, Tuscola	65 min
Apr 11, 3:59 PM EDT	Severe Thunderstorm Warning	DTX	Saginaw, Shiawassee	38 min
Apr 11, 4:50 PM EDT	Special Marine Warning	DTX		115 min
Apr 11, 4:58 PM EDT	Severe Thunderstorm Warning	DTX	Huron, Sanilac, Tuscola	62 min
Apr 11, 5:16 PM EDT	Severe Thunderstorm Warning	DTX	Bay, Saginaw	32 min
Apr 11, 5:30 PM EDT	Tornado Warning	DTX	Sanilac	29 min
Apr 11, 5:35 PM EDT	Severe Thunderstorm Warning	DTX	Shiawassee	70 min
Apr 11, 6:06 PM EDT	Tornado Warning	DTX	Genesee, Saginaw	30 min
Apr 11, 6:42 PM EDT	Severe Thunderstorm Warning	DTX	Genesee, Shiawassee	64 min
Apr 11, 6:43 PM EDT	Severe Thunderstorm Warning	DTX	Lapeer	62 min
Apr 11, 6:49 PM EDT	Severe Thunderstorm Warning	DTX	Livingston	39 min
Apr 11, 6:49 PM EDT	Tornado Warning	DTX	Genesee	35 min
Apr 11, 7:12 PM EDT	Severe Thunderstorm Warning	DTX	Oakland	63 min
Apr 11, 7:19 PM EDT	Severe Thunderstorm Warning	DTX	Tuscola	30 min
Apr 11, 7:45 PM EDT	Severe Thunderstorm Warning	DTX	Lapeer, Saint Clair, Sanilac	75 min
Apr 11, 7:52 PM EDT	Special Marine Warning	DTX		93 min
Apr 11, 7:59 PM EDT	Severe Thunderstorm Warning	DTX	Macomb	56 min

Nearby

Tornado Warnings in Michigan, 2008 Every tornado warning in 2008 Tornadoes in 2008

Sources

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