Alert archive / Michigan / Tornado Warnings in 2018

Tornado Warning 3, NWS Grand Rapids, MI

September 1, 2018Mecosta County, Michigan

NWS Grand Rapids, MI issued this tornado warning at Sep 1, 2018, 7:53 PM EDT for Mecosta County, Michigan. It was in force for 37 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
Sep 1, 2018, 7:53 PM EDT (23:53 UTC)
Expired
Sep 1, 2018, 8:30 PM EDT
In force
37 min
Issued by
NWS Grand Rapids, MI
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

County Mecosta County, MI

The radar

The Grand Rapids radar (KGRR), 79 km from the middle of the area, began a volume at 23:54 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.

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 11.9 hours before the alert went out and 171 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-pSkew-T log-p diagram, Detroit, MI at 12:00Z on 2018-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 214 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Detroit, MI at 12:00Z on 2018-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
214 J/kg
Mixed-layer CIN
-143 J/kg
Mixed-layer LCL
1058 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
-12 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

110 
WFUS53 KGRR 012353
TORGRR
MIC107-020030-
/O.NEW.KGRR.TO.W.0003.180901T2353Z-180902T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Grand Rapids MI
753 PM EDT SAT SEP 1 2018

The National Weather Service in Grand Rapids has issued a

* Tornado Warning for...
  Southeastern Mecosta County in central Michigan...

* Until 830 PM EDT.
    
* At 752 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Lakeview, or 17 miles southeast of Big Rapids,
  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...
  Sylvester around 800 PM EDT.
  Mecosta around 805 PM EDT.

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 4347 8509 4347 8538 4368 8538 4369 8509
TIME...MOT...LOC 2352Z 266DEG 19KT 4348 8532 

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

$$

DUKE
2 follow-up statements
396 
WWUS53 KGRR 020013
SVSGRR

Severe Weather Statement
National Weather Service Grand Rapids MI
813 PM EDT SAT SEP 1 2018

MIC107-020030-
/O.CON.KGRR.TO.W.0003.000000T0000Z-180902T0030Z/
Mecosta MI-
813 PM EDT SAT SEP 1 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM EDT FOR
SOUTHEASTERN MECOSTA COUNTY...
    
At 813 PM EDT, a severe thunderstorm capable of producing a tornado
was located 6 miles northeast of Lakeview, or 14 miles north of
Stanton, 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 tornadic thunderstorm will remain over mainly rural areas of
southeastern Mecosta County.

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 4347 8509 4347 8520 4351 8517 4353 8509
TIME...MOT...LOC 0013Z 266DEG 19KT 4349 8516 

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

$$

LAURENS
648 
WWUS53 KGRR 020022
SVSGRR

Severe Weather Statement
National Weather Service Grand Rapids MI
822 PM EDT SAT SEP 1 2018

MIC107-020031-
/O.EXP.KGRR.TO.W.0003.000000T0000Z-180902T0030Z/
Mecosta MI-
822 PM EDT SAT SEP 1 2018

...THE TORNADO WARNING FOR SOUTHEASTERN MECOSTA COUNTY WILL EXPIRE AT
830 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Grand Rapids.

LAT...LON 4347 8509 4347 8520 4351 8517 4353 8509
TIME...MOT...LOC 0021Z 266DEG 19KT 4349 8510 

$$

LAURENS

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 9:04 AM EDTSpecial Weather StatementGRRMason, Muskegon, Oceana56 min
Sep 1, 9:59 AM EDTSpecial Weather StatementGRRMuskegon, Oceana, Ottawa61 min
Sep 1, 11:07 AM EDTAreal Flood AdvisoryGRRMuskegon6 hr
Sep 1, 12:43 PM EDTFlood WatchGRRAllegan, Barry, Calhoun, Clare, Clinton, Eaton and 17 more18 hr
Sep 1, 1:58 PM EDTSpecial Weather StatementGRRBarry, Eaton2 hr
Sep 1, 2:55 PM EDTSpecial Weather StatementGRRJackson50 min
Sep 1, 6:01 PM EDTSpecial Weather StatementGRRCalhoun44 min
Sep 1, 6:28 PM EDTSpecial Weather StatementGRRKalamazoo47 min
Sep 1, 6:34 PM EDTSevere Thunderstorm WarningGRRAllegan, Barry, Kalamazoo41 min
Sep 1, 6:47 PM EDTSpecial Weather StatementGRRJackson88 min
Sep 1, 6:55 PM EDTSpecial Weather StatementGRRIngham65 min
Sep 1, 6:56 PM EDTTornado WarningGRRBarry, Kalamazoo20 min
Sep 1, 7:21 PM EDTSevere Thunderstorm WarningGRRCalhoun54 min
Sep 1, 7:27 PM EDTTornado WarningGRRCalhoun48 min
Sep 1, 7:39 PM EDTSevere Thunderstorm WarningGRRIngham29 min
Sep 1, 7:48 PM EDTSevere Thunderstorm WarningGRRJackson42 min

Nearby

Tornado Warnings in Michigan, 2018Every tornado warning in 2018Tornadoes in 2018

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.