Alert archive / Michigan / Tornado Warnings in 2021

Tornado Warning 13, NWS Detroit, MI

July 27, 2021Saint Clair County, Michigan

NWS Detroit, MI issued this tornado warning at Jul 27, 2021, 8:13 PM EDT for Saint Clair County, Michigan. It was in force for 28 min. 1 report 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: Jul 27, 2021, 8:13 PM EDT (00:13 UTC)
Expired: Jul 27, 2021, 8:41 PM EDT
In force: 28 min
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Saint Clair County, MI

The radar

The Detroit radar (KDTX), 87 km from the middle of the area, began a volume at 00:13 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 27, 8:35 PM EDT	TSTM WND DMG	2 Nw Wadhams, MI	LARGE TREE LIMB DOWN. APPROXIMATELY 8 INCHES IN DIAMETER AND 35 FEET LONG.

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, 0.2 hours before the alert went out and 83 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: 196 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 1420 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 231 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

351 
WFUS53 KDTX 280013
TORDTX
MIC147-280100-
/O.NEW.KDTX.TO.W.0013.210728T0013Z-210728T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Detroit/Pontiac MI
813 PM EDT Tue Jul 27 2021

The National Weather Service in Detroit/Pontiac has issued a

* Tornado Warning for...
  Northeastern St. Clair County in southeastern Michigan...

* Until 900 PM EDT.
    
* At 813 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Lakeport, moving southeast at 30 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...
  Port Huron and Marysville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4296 8242 4294 8245 4290 8246 4289 8251
      4316 8269 4316 8256 4300 8242 4299 8243
      4298 8242
TIME...MOT...LOC 0013Z 330DEG 29KT 4315 8263 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

MR

3 follow-up statements

006 
WWUS53 KDTX 280024
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
824 PM EDT Tue Jul 27 2021

MIC147-280100-
/O.CON.KDTX.TO.W.0013.000000T0000Z-210728T0100Z/
St. Clair MI-
824 PM EDT Tue Jul 27 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM EDT FOR
NORTHEASTERN ST. CLAIR COUNTY...
    
At 823 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Lakeport, moving southeast at 30 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...
Port Huron, Marysville, Blaine, Fort Gratiot, North Street, Wadhams
and Ruby.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4294 8245 4290 8246 4289 8251 4311 8265
      4312 8253 4300 8242 4299 8243 4298 8242
      4296 8242
TIME...MOT...LOC 0023Z 332DEG 24KT 4309 8259 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

MR

612 
WWUS53 KDTX 280033
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
833 PM EDT Tue Jul 27 2021

MIC147-280100-
/O.CON.KDTX.TO.W.0013.000000T0000Z-210728T0100Z/
St. Clair MI-
833 PM EDT Tue Jul 27 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM EDT FOR
NORTHEASTERN ST. CLAIR COUNTY...
    
At 832 PM EDT, a severe thunderstorm capable of producing a tornado
was located 5 miles northwest of Wadhams, moving southeast at 30 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...
Marysville and North Street 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4294 8245 4290 8246 4289 8251 4304 8261
      4307 8250 4298 8243 4296 8242
TIME...MOT...LOC 0032Z 333DEG 26KT 4303 8255 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

MR

101 
WWUS53 KDTX 280041
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
841 PM EDT Tue Jul 27 2021

MIC147-280051-
/O.CAN.KDTX.TO.W.0013.000000T0000Z-210728T0100Z/
St. Clair MI-
841 PM EDT Tue Jul 27 2021

...THE TORNADO WARNING FOR NORTHEASTERN ST. CLAIR COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.

LAT...LON 4294 8245 4290 8246 4289 8251 4304 8261
      4307 8250 4298 8243 4296 8242
TIME...MOT...LOC 0040Z 330DEG 29KT 4296 8250 

$$

MR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 2:36 PM EDT	Flash Flood Watch	DTX	Lenawee, Livingston, Macomb, Monroe, Oakland, Washtenaw and 1 more	17 hr

Nearby

Tornado Warnings in Michigan, 2021 Every tornado warning in 2021 Tornadoes in 2021

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.