Alert archive / Michigan / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 49, NWS Grand Rapids, MI

June 8, 2011Allegan County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jun 8, 2011, 11:30 PM EDT for Allegan County, Michigan. It was in force for 48 min. 5 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: Jun 8, 2011, 11:30 PM EDT (03:30 UTC)
Expired: Jun 9, 2011, 12:18 AM EDT
In force: 48 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Hail: 0.0 in
Wind: 75.0 mph

County Allegan County, MI

The radar

The Grand Rapids radar (KGRR), 53 km from the middle of the area, began a volume at 03:30 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
Jun 8, 11:50 PM EDT	TSTM WND DMG	Allegan, MI	THE THUNDERSTORM GUST FRONT BLEW DOWN NUMEROUS TREES AND BRANCHES. SOME ROADS HAVE BEEN BLOCKED SO THAT THE COUNTY ROAD CREWS HAVE TO CLEAR SOME STEETS. THE GUST FRONT RESULTED IN TREES BEING BLOWN DOWN ACROSS MOST OF ALLEGAN COUNTY.
Jun 8, 11:50 PM EDT	TSTM WND DMG	Saugatuck, MI	NUMEROUS TREES AND BRANCHES BLOWN DOWN.
Jun 8, 11:50 PM EDT	TSTM WND GST 45	8 W Allegan, MI
Jun 8, 11:57 PM EDT	TSTM WND GST 50	Allegan, MI	SCATTERED POWER OUTAGES.
Jun 9, 12:07 AM EDT	TSTM WND GST 52	3 Ne Hopkins, MI

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
Jun 8, 10:39 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 3.5 hours before the alert went out and 216 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: 2055 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1930 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 291 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 11.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

967 
WUUS53 KGRR 090330
SVRGRR
MIC005-090500-
/O.NEW.KGRR.SV.W.0049.110609T0330Z-110609T0500Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1130 PM EDT WED JUN 8 2011

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ALLEGAN COUNTY IN SOUTHWEST MICHIGAN...

* UNTIL 100 AM EDT

* AT 1126 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
  DESTRUCTIVE WINDS IN EXCESS OF 75 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM 15 MILES NORTHWEST OF SAUGATUCK TO 20
  MILES WEST OF SOUTH HAVEN..AND MOVING EAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SAUGATUCK...          ALLEGAN...            FENNVILLE...
  PLAINWELL...          WAYLAND...            GANGES...
  MOLINE...             PULLMAN...            CASTLE PARK...
  SAUGATUCK STATE PARK...                     GRAAFSCHAP...
  HOLLAND TULIP ARPT... BURNIPS...            BRADLEY...
  DOUGLAS...            SHELBYVILLE...        MARTIN...
  OTSEGO...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE SHELTER NOW. THIS IS AN EXTREMELY DANGEROUS SITUATION WITH
TORNADO LIKE WINDS AND SIGNIFICANT DAMAGE EXPECTED. MOBILE HOMES AND
HIGH PROFILE VEHICLES ARE ESPECIALLY SUSCEPTIBLE TO WINDS OF THIS
MAGNITUDE AND MAY BE OVERTURNED. TAKE COVER NOW...MOVE TO AN INTERIOR
ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4258 8623 4264 8624 4270 8621 4277 8621
      4277 8555 4242 8555 4242 8628
TIME...MOT...LOC 0328Z 280DEG 55KT 4280 8634 4253 8651
WIND...HAIL 75MPH 0.00IN

$$

MEADE

1 follow-up statement

936 
WWUS53 KGRR 090418
SVSGRR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1218 AM EDT THU JUN 9 2011

MIC005-090429-
/O.CAN.KGRR.SV.W.0049.000000T0000Z-110609T0500Z/
ALLEGAN MI-
1218 AM EDT THU JUN 9 2011

...THE SEVERE THUNDERSTORM WARNING FOR ALLEGAN COUNTY IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY...HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THESE
THUNDERSTORMS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM EDT
THURSDAY MORNING FOR SOUTHWESTERN MICHIGAN.

LAT...LON 4258 8623 4264 8624 4270 8621 4277 8621
      4277 8555 4242 8555 4242 8628
TIME...MOT...LOC 0419Z 280DEG 55KT 4266 8530 4239 8547

$$

LAURENS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 8:33 PM EDT	Special Weather Statement	GRR	Lake	57 min
Jun 8, 9:44 PM EDT	Severe Thunderstorm Warning	GRR	Lake, Mason, Osceola	46 min
Jun 8, 10:13 PM EDT	Special Marine Warning	GRR		110 min
Jun 8, 10:15 PM EDT	Severe Thunderstorm Warning	GRR	Mason	45 min
Jun 8, 10:26 PM EDT	Severe Thunderstorm Warning	GRR	Clare, Lake, Osceola	64 min
Jun 8, 10:31 PM EDT	Flash Flood Warning	GRR	Clare, Lake, Mason, Osceola	6 hr
Jun 8, 10:36 PM EDT	Severe Thunderstorm Warning	GRR	Muskegon, Newaygo, Oceana	84 min
Jun 8, 10:45 PM EDT	Tornado Warning	GRR	Clare	30 min
Jun 8, 11:11 PM EDT	Special Marine Warning	GRR		58 min
Jun 8, 11:11 PM EDT	Severe Thunderstorm Warning	GRR	Mecosta	94 min
Jun 8, 11:18 PM EDT	Severe Thunderstorm Warning	GRR	Muskegon, Ottawa	57 min
Jun 8, 11:35 PM EDT	Severe Thunderstorm Warning	GRR	Isabella	85 min
Jun 8, 11:44 PM EDT	Severe Thunderstorm Warning	GRR	Kent, Montcalm	75 min
Jun 9, 12:04 AM EDT	Severe Thunderstorm Warning	GRR	Gratiot	63 min
Jun 9, 12:13 AM EDT	Special Weather Statement	GRR	Barry, Calhoun, Clinton, Eaton, Ionia, Kalamazoo	62 min
Jun 9, 12:34 AM EDT	Special Weather Statement	GRR	Calhoun, Clinton, Eaton, Ingham, Ionia	56 min
Jun 9, 12:59 AM EDT	Special Weather Statement	GRR	Ingham, Jackson	61 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2011 Every severe thunderstorm warning in 2011

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.