Alert archive / Michigan / Tornado Warnings in 2012

Tornado Warning 5, NWS Grand Rapids, MI

March 12, 2012Eaton County, Michigan

NWS Grand Rapids, MI issued this tornado warning at Mar 12, 2012, 6:36 PM EDT for Eaton County, Michigan. It was in force for 24 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: Mar 12, 2012, 6:36 PM EDT (22:36 UTC)
Expired: Mar 12, 2012, 7:00 PM EDT
In force: 24 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon

County Eaton County, MI

The radar

The Grand Rapids radar (KGRR), 64 km from the middle of the area, began a volume at 22:38 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
Mar 12, 4:22 PM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 10.6 hours before the alert went out and 123 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: 1981 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 86 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.

466 
WFUS53 KGRR 122236
TORGRR
MIC045-122300-
/O.NEW.KGRR.TO.W.0005.120312T2236Z-120312T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
636 PM EDT MON MAR 12 2012

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A

* TORNADO WARNING FOR...
  EATON COUNTY IN SOUTH CENTRAL MICHIGAN...

* UNTIL 700 PM EDT

* AT 634 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
  DANGEROUS STORM WAS LOCATED 6 MILES SOUTH OF NASHVILLE...AND MOVING
  EAST AT 30 MPH.

THE WARNING INCLUDES AREAS SURROUNDING THESE LOCATIONS...
  CHARLOTTE...          EATON RAPIDS...       GRAND LEDGE...
  BELLEVUE...           KALAMO...             BROOKFIELD...
  WAVERLY...            MULLIKEN...           DIMONDALE...
  OLIVET...             VERMONTVILLE...       POTTERVILLE...
  SUNFIELD...           DELTA MILLS...        WOODBURY...
  HOYTVILLE...          MILLETT...            LITTLE VENICE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING OBJECTS.

&&

LAT...LON 4245 8507 4277 8507 4277 8460 4242 8460
      4242 8507
TIME...MOT...LOC 2236Z 255DEG 27KT 4253 8510

$$

TJT

1 follow-up statement

668 
WWUS53 KGRR 122252
SVSGRR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
652 PM EDT MON MAR 12 2012

MIC045-122302-
/O.EXP.KGRR.TO.W.0005.000000T0000Z-120312T2300Z/
EATON MI-
652 PM EDT MON MAR 12 2012

...THE TORNADO WARNING FOR EATON COUNTY WILL EXPIRE AT 700 PM EDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY...HOWEVER SMALL HAIL AND GUSTY WINDS ARE STILL POSSIBLE WITH
THIS THUNDERSTORM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT MONDAY EVENING
FOR SOUTHWESTERN MICHIGAN.

LAT...LON 4245 8507 4277 8507 4277 8460 4242 8460
      4242 8507
TIME...MOT...LOC 2252Z 255DEG 27KT 4256 8494

$$

TJT

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 12, 3:18 AM EDT	Small Craft Advisory	GRR		17 hr
Mar 12, 11:54 AM EDT	River Flood Advisory	GRR	Ionia	5 days
Mar 12, 11:54 AM EDT	River Flood Advisory	GRR	Ingham	47 hr
Mar 12, 1:32 PM EDT	Special Marine Warning	GRR		100 min
Mar 12, 2:18 PM EDT	Special Weather Statement	GRR	Muskegon, Oceana	57 min
Mar 12, 2:45 PM EDT	Special Weather Statement	GRR	Mason	60 min
Mar 12, 3:01 PM EDT	Special Weather Statement	GRR	Lake, Newaygo	59 min
Mar 12, 3:10 PM EDT	Special Weather Statement	GRR	Muskegon	50 min
Mar 12, 3:15 PM EDT	Special Weather Statement	GRR	Newaygo	60 min
Mar 12, 3:43 PM EDT	Special Weather Statement	GRR	Mecosta	62 min
Mar 12, 4:00 PM EDT	Severe Thunderstorm Warning	GRR	Mecosta, Montcalm, Newaygo	45 min
Mar 12, 4:05 PM EDT	Severe Thunderstorm Warning	GRR	Clare, Osceola	40 min
Mar 12, 4:33 PM EDT	Severe Thunderstorm Warning	GRR	Isabella	21 min
Mar 12, 4:36 PM EDT	Special Marine Warning	GRR		84 min
Mar 12, 5:02 PM EDT	Special Weather Statement	GRR	Van Buren	58 min
Mar 12, 5:24 PM EDT	Special Weather Statement	GRR	Allegan	66 min
Mar 12, 5:32 PM EDT	Severe Thunderstorm Warning	GRR	Van Buren	43 min
Mar 12, 5:38 PM EDT	Tornado Warning	GRR	Van Buren	16 min
Mar 12, 5:44 PM EDT	Special Weather Statement	GRR	Mecosta	61 min
Mar 12, 5:44 PM EDT	Tornado Warning	GRR	Kalamazoo	43 min
Mar 12, 5:59 PM EDT	Tornado Warning	GRR	Allegan, Barry	44 min
Mar 12, 6:08 PM EDT	Tornado Warning	GRR	Isabella, Mecosta	37 min

Nearby

Tornado Warnings in Michigan, 2012 Every tornado warning in 2012 Tornadoes in 2012

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.