Alert archive / Michigan / Tornado Warnings in 2017

Tornado Warning 2, NWS Detroit, MI

August 17, 2017Sanilac County, Tuscola County, Michigan

NWS Detroit, MI issued this tornado warning at Aug 17, 2017, 8:16 PM EDT for Sanilac County, Tuscola County, Michigan. It was in force for 44 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: Aug 17, 2017, 8:16 PM EDT (00:16 UTC)
Expired: Aug 17, 2017, 9:00 PM EDT
In force: 44 min
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Tornado: Observed
Hail: 0.0 in

Counties Sanilac County, MI, Tuscola County, MI

The radar

The Detroit radar (KDTX), 89 km from the middle of the area, began a volume at 00:19 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
Aug 17, 8:16 PM EDT	TORNADO	5 E Kingston, MI	REPORT OF MULTIPLE TREES KNOCKED DOWN.
Aug 17, 8:22 PM EDT	TORNADO	2 S Decker, MI	REPORT OF OBSERVED TOUCHDOWN. NO DAMAGE ASSOCIATED WITH THIS REPORT AT THIS TIME.

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

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 0.3 hours before the alert went out and 85 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: 770 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 746 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 197 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 6.0

Open this sounding in Storm Lab

The text

As transmitted.

858 
WFUS53 KDTX 180016
TORDTX
MIC151-157-180100-
/O.NEW.KDTX.TO.W.0002.170818T0016Z-170818T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Detroit/Pontiac MI
816 PM EDT THU AUG 17 2017

The National Weather Service in Detroit/Pontiac has issued a

* Tornado Warning for...
  East central Tuscola County in southeastern Michigan...
  Northwestern Sanilac County in southeastern Michigan...

* Until 900 PM EDT

* At 815 PM EDT, a confirmed tornado was located near Kingston, or
  near Marlette, moving northeast at 40 mph.

  HAZARD...Damaging tornado. 

  SOURCE...Weather spotters confirmed tornado. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* The tornado will be near...
  Argyle around 835 PM EDT. 
  Deckerville around 845 PM EDT. 

Other locations impacted by this tornadic thunderstorm include
Deckerville, Sandusky, Kingston, Argyle, Decker, Palms, Wilmot,
Snover, Elmer and Juhl.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4335 8328 4349 8324 4365 8271 4335 8278
TIME...MOT...LOC 0015Z 242DEG 34KT 4342 8309 

TORNADO...OBSERVED
HAIL...0.00IN

$$

DG

4 follow-up statements

121 
WWUS53 KDTX 180027
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
827 PM EDT THU AUG 17 2017

MIC157-180037-
/O.CAN.KDTX.TO.W.0002.000000T0000Z-170818T0100Z/
Tuscola MI-
827 PM EDT THU AUG 17 2017

...THE TORNADO WARNING FOR EAST CENTRAL TUSCOLA COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

LAT...LON 4340 8277 4343 8311 4350 8311 4365 8271
TIME...MOT...LOC 0027Z 250DEG 20KT 4345 8302 

$$

MIC151-180100-
/O.CON.KDTX.TO.W.0002.000000T0000Z-170818T0100Z/
Sanilac MI-
827 PM EDT THU AUG 17 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM EDT FOR
NORTHWESTERN SANILAC COUNTY...
    
At 827 PM EDT, a severe thunderstorm capable of producing a tornado
was located 8 miles southwest of Argyle, or 9 miles north of
Marlette, moving east at 20 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This dangerous storm will be near...
  Argyle around 845 PM EDT. 
  Sandusky around 850 PM EDT. 
  Deckerville around 900 PM EDT. 

Other locations impacted by this tornadic thunderstorm include
Deckerville, Sandusky, Argyle, Decker, Palms, Snover and Elmer.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

&&

LAT...LON 4340 8277 4343 8311 4350 8311 4365 8271
TIME...MOT...LOC 0027Z 250DEG 20KT 4345 8302 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

DG

196 
WWUS53 KDTX 180049
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
849 PM EDT THU AUG 17 2017

MIC151-180100-
/O.CON.KDTX.TO.W.0002.000000T0000Z-170818T0100Z/
Sanilac MI-
849 PM EDT THU AUG 17 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM EDT FOR NORTH
CENTRAL SANILAC COUNTY...
    
At 849 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Deckerville, moving northeast at 40 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This tornadic thunderstorm will remain over mainly rural areas of
north central Sanilac County, including the following locations:
Deckerville and McGregor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

&&

LAT...LON 4343 8276 4345 8289 4353 8293 4361 8272
      4360 8272
TIME...MOT...LOC 0049Z 242DEG 34KT 4355 8276 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

DG

504 
WWUS53 KDTX 180050 CCA
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
850 PM EDT THU AUG 17 2017

MIC151-180100-
/O.COR.KDTX.TO.W.0002.000000T0000Z-170818T0100Z/
Sanilac MI-
850 PM EDT THU AUG 17 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM EDT FOR NORTH
CENTRAL SANILAC COUNTY...
    
At 850 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Sandusky, moving east at 25 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

Locations impacted include...
Deckerville and McGregor. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

&&

LAT...LON 4343 8276 4345 8289 4353 8293 4361 8272
      4360 8272
TIME...MOT...LOC 0049Z 247DEG 21KT 4355 8276 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

DG

445 
WWUS53 KDTX 180100
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
900 PM EDT THU AUG 17 2017

MIC151-180109-
/O.EXP.KDTX.TO.W.0002.000000T0000Z-170818T0100Z/
Sanilac MI-
900 PM EDT THU AUG 17 2017

...THE TORNADO WARNING FOR NORTH CENTRAL SANILAC COUNTY WILL EXPIRE
AT 900 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning will be allowed to expire.

LAT...LON 4343 8276 4345 8289 4353 8293 4361 8272
      4360 8272
TIME...MOT...LOC 0059Z 247DEG 21KT 4357 8269 

$$

DG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 8:27 PM EDT	Special Weather Statement	DTX	Saint Clair	48 min
Aug 18, 4:05 AM EDT	Beach Hazards Statement	DTX	Huron	16 hr

Nearby

Tornado Warnings in Michigan, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.