Alert archive / Michigan / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 39, NWS Grand Rapids, MI

July 4, 2012Isabella County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 4, 2012, 4:37 PM EDT for Isabella County, Michigan. It was in force for 53 min. 2 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
Jul 4, 2012, 4:37 PM EDT (20:37 UTC)
Expired
Jul 4, 2012, 5:30 PM EDT
In force
53 min
Issued by
NWS Grand Rapids, MI
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Isabella County, MI

The radar

The Grand Rapids radar (KGRR), 97 km from the middle of the area, began a volume at 20:40 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

TimeReportWhereRemark
Jul 4, 4:45 PM EDTTSTM WND DMGMount Pleasant, MISEVERAL TREES REPORTED DOWN IN MOUNT PLEASANT BY ISABELLA 911.
Jul 4, 4:55 PM EDTHAIL 1Weidman, MIREPORTED BY ISABELLA 911.

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, 8.6 hours before the alert went out and 148 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 2012-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2763 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 2012-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 square meters per square second.1939Sfc1 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
2763 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
1189 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
-19 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.4

Open this sounding in Storm Lab

The text

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

838 
WUUS53 KGRR 042037
SVRGRR
MIC073-042130-
/O.NEW.KGRR.SV.W.0039.120704T2037Z-120704T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
437 PM EDT WED JUL 4 2012

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ISABELLA COUNTY IN CENTRAL MICHIGAN...

* UNTIL 530 PM EDT

* AT 432 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS
  IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR OIL CITY..AND
  MOVING SOUTHEAST AT 20 MPH. SMALL HAIL MAY ALSO ACCOMPANY THESE
  DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...
  MOUNT PLEASANT...     ROSEBUSH...           WEIDMAN...
  DELWIN...             LEATON...             BEAL CITY...
  SHEPHERD...           DEERFIELD CENTER...   BROOMFIELD CENTER...
  COE...                WISE...               SHERMAN CITY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES
PER HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT
DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4347 8475 4360 8508 4377 8509 4373 8460
      4347 8460
TIME...MOT...LOC 2037Z 303DEG 17KT 4357 8462
WIND...HAIL 60MPH <1.00IN

$$

DUKE
1 follow-up statement
113 
WWUS53 KGRR 042107
SVSGRR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
507 PM EDT WED JUL 4 2012

MIC073-042130-
/O.CON.KGRR.SV.W.0039.000000T0000Z-120704T2130Z/
ISABELLA MI-
507 PM EDT WED JUL 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR ISABELLA
COUNTY UNTIL 530 PM EDT...

AT 504 PM EDT...LOCAL LAW ENFORCEMENT REPORTED A SEVERE THUNDERSTORM
PRODUCING LARGE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS
STORM WAS LOCATED 5 MILES SOUTH OF WEIDMAN...MOVING SOUTHEAST AT 20
MPH.

HAIL TO ONE INCH IN DIAMETER HAS BEEN REPORTED IN WEIDMAN AS OF 455 
PM. ALSO...SEVERAL TREES ARE DOWN IN MOUNT PLEASANT.

LOCATIONS IMPACTED INCLUDE...
  MOUNT PLEASANT...     ROSEBUSH...           WEIDMAN...
  DELWIN...             LEATON...             BEAL CITY...
  SHEPHERD...           DEERFIELD CENTER...   BROOMFIELD CENTER...
  COE...                WISE...               SHERMAN CITY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
WEDNESDAY EVENING FOR SOUTH CENTRAL MICHIGAN.

LAT...LON 4347 8475 4360 8508 4377 8509 4373 8460
      4347 8460
TIME...MOT...LOC 2106Z 311DEG 17KT 4361 8493
WIND...HAIL 60MPH 1.00IN

$$

DUKE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 3:24 AM EDTHeat AdvisoryGRRClare, Isabella, Lake, Mason, Mecosta, Newaygo and 2 more3 days
Jul 4, 4:55 PM EDTAreal Flood AdvisoryGRRIsabella, Mecosta3 hr
Jul 4, 5:16 PM EDTSevere Thunderstorm WarningGRRMecosta29 min
Jul 4, 5:31 PM EDTSevere Thunderstorm WarningGRRIsabella59 min
Jul 4, 6:15 PM EDTFlash Flood WarningGRRIsabella, Mecosta4 hr
Jul 4, 6:32 PM EDTSevere Thunderstorm WarningGRRIsabella58 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2012Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.