Alert archive / Michigan / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 36, NWS Grand Rapids, MI

August 20, 2016Allegan County, Kent County, Ottawa County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 20, 2016, 2:05 PM EDT for Allegan County, Kent County, Ottawa County, Michigan. It was in force for 55 min. 9 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 20, 2016, 2:05 PM EDT (18:05 UTC)
Expired: Aug 20, 2016, 3:00 PM EDT
In force: 55 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Allegan County, MI, Kent County, MI, Ottawa County, MI

The radar

The Grand Rapids radar (KGRR), 40 km from the middle of the area, began a volume at 18:04 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 20, 2:16 PM EDT	TSTM WND GST 60	5 Ene Hamilton, MI	SPOTTER ESTIMATED WIND GUST. TIME ESTIMATED BY RADAR. .
Aug 20, 2:23 PM EDT	TORNADO	3 Wnw North Dorr, MI	TREES AND POWERLINES DOWN NEAR 20TH & ADAMS PER FIRE DEPT. MULTIPLE REPORTS OF A FUNNEL CLOUD OR TORNADO.
Aug 20, 2:31 PM EDT	TSTM WND DMG	3 S Grandville, MI	911 CALL CENTER RELAYED A CALL FROM THE PUBLIC. EXTENSIVE WIND DAMAGE BEING OBSERVED IN WYOMING. SEVERAL TREES DOWN IN THE AREA. POSSIBLE DAMAGE TO HOUSE. EXTENT OF DAMAGE TO HOUSE IS UNKNOWN. .
Aug 20, 2:31 PM EDT	TORNADO	3 Nnw Byron Center, MI	TREE REPORTED DOWN ON M6, BLOCKING THE RIGHT HAND LANE OF EAST BOUND TRAFFIC.
Aug 20, 2:38 PM EDT	TORNADO	1 Se Grandville, MI	DEBRIS IN THE AIR NEAR 40TH AND IVANREST.
Aug 20, 2:42 PM EDT	TSTM WND DMG	1 Ne Wyoming, MI	TREES DOWN ON HOUSES NEAR 32ND ST AND HIGHGATE AVE ALSO 2900 BLK LONGSTREET AVE. POSSIBLE TORNADO.
Aug 20, 2:50 PM EDT	TORNADO	Grand Rapids, MI	A BRIEF EF-O TORNADO TOUCHED DOWN IN KENT COUNTY NEAR PERKINS AVENUE NE BETWEEN LEONARD STREET NE AND KNAPP STREET NE. TREE DAMAGE AND SOME PROPERTY DAMAGE FROM FALLEN TREES OCCURRED AS THE RESULT OF THIS BRIEF TORNADO.
Aug 20, 2:51 PM EDT	TSTM WND DMG	2 Sw East Grand Rapids, MI	RECEIVED A CALL FROM THE PUBLIC REPORTING SEVERAL DOWNED TREE LIMBS. LARGEST LIMB DOWNED IN HER YARD IS 6 INCHES IN DIAMETER. .
Aug 20, 2:52 PM EDT	TSTM WND GST 48	1 Ssw East Grand Rapids, MI	.

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 12:00Z, 6.1 hours before the alert went out and 213 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: 75 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 1500 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

883 
WUUS53 KGRR 201805
SVRGRR
MIC005-081-139-201900-
/O.NEW.KGRR.SV.W.0036.160820T1805Z-160820T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
205 PM EDT SAT AUG 20 2016

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  OTTAWA COUNTY IN SOUTHWESTERN MICHIGAN...
  SOUTHWESTERN KENT COUNTY IN SOUTHWESTERN MICHIGAN...
  NORTHERN ALLEGAN COUNTY IN SOUTHWESTERN MICHIGAN...

* UNTIL 300 PM EDT

* AT 204 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED 9 MILES NORTHEAST
  OF FENNVILLE...MOVING NORTHEAST AT 30 MPH.

  HAZARD...60 MPH WIND GUSTS. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  GRAND RAPIDS...        HOLLAND...             WYOMING...
  KENTWOOD...            WALKER...              EAST GRAND RAPIDS...
  HUDSONVILLE...         ZEELAND...             COOPERSVILLE...
  JENISON...             NORTHVIEW...           BEECHWOOD...
  FOREST HILLS...        GRANDVILLE...          DORR...
  HAMILTON...            WRIGHT...              HOPKINS...
  BELMONT...             DRENTHE...             

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4278 8617 4278 8615 4279 8612 4280 8612
      4279 8615 4280 8615 4279 8617 4312 8599
      4312 8591 4319 8591 4306 8543 4254 8577
      4271 8621
TIME...MOT...LOC 1804Z 205DEG 25KT 4268 8595 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

WEBB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 10:06 AM EDT	Special Marine Warning	GRR		114 min
Aug 20, 10:44 AM EDT	Special Weather Statement	GRR	Muskegon, Oceana, Ottawa	61 min
Aug 20, 11:45 AM EDT	Special Weather Statement	GRR	Lake, Mason, Newaygo	30 min
Aug 20, 12:40 PM EDT	Special Weather Statement	GRR	Allegan, Van Buren	65 min
Aug 20, 1:12 PM EDT	Severe Thunderstorm Warning	GRR	Allegan, Van Buren	48 min
Aug 20, 1:21 PM EDT	Tornado Warning Tornado observed	GRR	Allegan, Van Buren	24 min
Aug 20, 1:47 PM EDT	Tornado Warning Tornado observed	GRR	Allegan, Ottawa	28 min
Aug 20, 2:12 PM EDT	Tornado Warning Tornado observed	GRR	Allegan, Kent, Ottawa	33 min
Aug 20, 2:16 PM EDT	Severe Thunderstorm Warning	GRR	Barry, Calhoun, Eaton, Kalamazoo	59 min
Aug 20, 2:35 PM EDT	Tornado Warning	GRR	Barry, Eaton	25 min
Aug 20, 2:36 PM EDT	Tornado Warning Tornado observed	GRR	Kent	24 min
Aug 20, 2:42 PM EDT	Severe Thunderstorm Warning	GRR	Newaygo	24 min
Aug 20, 2:59 PM EDT	Areal Flood Advisory	GRR	Allegan, Barry, Ionia, Kent, Montcalm	12 hr
Aug 20, 2:59 PM EDT	Tornado Warning	GRR	Kent, Montcalm	31 min
Aug 20, 3:04 PM EDT	Severe Thunderstorm Warning	GRR	Barry, Clinton, Eaton, Ionia	41 min
Aug 20, 3:17 PM EDT	Tornado Warning	GRR	Ionia, Montcalm	28 min
Aug 20, 3:33 PM EDT	Severe Thunderstorm Warning	GRR	Clinton, Gratiot, Ionia, Isabella, Montcalm	42 min
Aug 20, 3:44 PM EDT	Severe Thunderstorm Warning	GRR	Lake	46 min
Aug 20, 4:14 PM EDT	Severe Thunderstorm Warning	GRR	Clinton, Gratiot, Isabella	31 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2016 Every severe thunderstorm warning in 2016

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.