Alert archive / Michigan / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Grand Rapids, MI

May 10, 2011Jackson County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at May 10, 2011, 6:20 AM EDT for Jackson County, Michigan. It was in force for 73 min. 4 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: May 10, 2011, 6:20 AM EDT (10:20 UTC)
Expired: May 10, 2011, 7:33 AM EDT
In force: 73 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Jackson County, MI

The radar

The Detroit radar (KDTX), 92 km from the middle of the area, began a volume at 10:20 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
May 10, 6:45 AM EDT	HAIL 0.5	3 Ene Concord, MI
May 10, 7:00 AM EDT	HAIL 0.75	4 Ssw Jackson, MI	MOTH BALL SIZE.
May 10, 7:00 AM EDT	HAIL 0.88	Spring Arbor, MI
May 10, 7:08 AM EDT	HAIL 0.5	Jackson, MI	HAIL FROM PEA SIZED TO ABOUT A HALF INCH.

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 00:00Z, 10.3 hours before the alert went out and 96 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: 2047 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 155 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.

953 
WUUS53 KGRR 101020
SVRGRR
MIC075-101145-
/O.NEW.KGRR.SV.W.0021.110510T1020Z-110510T1145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
620 AM EDT TUE MAY 10 2011

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JACKSON COUNTY IN SOUTH CENTRAL MICHIGAN...

* UNTIL 745 AM EDT

* AT 618 AM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE HAIL. 
  THIS STORM WAS LOCATED NEAR CONCORD..AND MOVING EAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  JACKSON...            GRASS LAKE...         CONCORD...
  BROOKLYN...           LIBERTY TWP...        MICHIGAN CENTER...
  VANDERCOOK LAKE...    HORTON...             SANDSTONE...
  NAPOLEON...           LEONI...              CLARK LAKE...
  SPRING ARBOR...       PULASKI...            PARMA...
  HANOVER...            TRIST...              FRANCISCO...

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.

&&

LAT...LON 4207 8414 4207 8471 4230 8471 4235 8412
      4208 8412
TIME...MOT...LOC 1020Z 268DEG 17KT 4218 8466
WIND...HAIL <50MPH 1.00IN

$$

MJS

3 follow-up statements

587 
WWUS53 KGRR 101049
SVSGRR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
649 AM EDT TUE MAY 10 2011

MIC075-101145-
/O.CON.KGRR.SV.W.0021.000000T0000Z-110510T1145Z/
JACKSON MI-
649 AM EDT TUE MAY 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
JACKSON COUNTY UNTIL 745 AM EDT...

AT 648 AM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE HAIL.  THIS STORM
WAS LOCATED 7 MILES SOUTHWEST OF JACKSON...MOVING EAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  JACKSON...            GRASS LAKE...         BROOKLYN...
  LIBERTY TWP...        MICHIGAN CENTER...    VANDERCOOK LAKE...
  HORTON...             SANDSTONE...          NAPOLEON...
  LEONI...              CLARK LAKE...         SPRING ARBOR...
  PARMA...              HANOVER...            TRIST...
  FRANCISCO...          NORVELL...            LIBERTY...

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.

&&

LAT...LON 4207 8414 4207 8462 4230 8465 4235 8412
      4208 8412
TIME...MOT...LOC 1049Z 268DEG 17KT 4218 8450
WIND...HAIL <50MPH 1.00IN

$$

MJS

245 
WWUS53 KGRR 101111
SVSGRR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
711 AM EDT TUE MAY 10 2011

MIC075-101145-
/O.CON.KGRR.SV.W.0021.000000T0000Z-110510T1145Z/
JACKSON MI-
711 AM EDT TUE MAY 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
JACKSON COUNTY UNTIL 745 AM EDT...

AT 712 AM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE HAIL.  THIS STORM
WAS LOCATED 6 MILES SOUTHEAST OF JACKSON...MOVING EAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  GRASS LAKE...         BROOKLYN...           LIBERTY TWP...
  MICHIGAN CENTER...    VANDERCOOK LAKE...    NAPOLEON...
  LEONI...              CLARK LAKE...         FRANCISCO...
  NORVELL...            LIBERTY...            ACKERSON LAKE...
  SOUTH JACKSON...      NAPOLEON ARPT...

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.

&&

LAT...LON 4207 8414 4207 8448 4220 8446 4235 8412
      4208 8412
TIME...MOT...LOC 1111Z 268DEG 17KT 4218 8436
WIND...HAIL <50MPH 1.00IN

$$

MJS

670 
WWUS53 KGRR 101133
SVSGRR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
733 AM EDT TUE MAY 10 2011

MIC075-101144-
/O.CAN.KGRR.SV.W.0021.000000T0000Z-110510T1145Z/
JACKSON MI-
733 AM EDT TUE MAY 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN JACKSON COUNTY IS
CANCELLED...

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 IS STILL POSSIBLE WITH THIS
THUNDERSTORM.

LAT...LON 4207 8414 4207 8448 4220 8446 4235 8412
      4208 8412
TIME...MOT...LOC 1134Z 268DEG 17KT 4218 8421

$$

MJS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 8:21 PM EDT	Special Weather Statement	GRR	Clinton, Ingham	54 min
May 10, 12:47 AM EDT	Special Weather Statement	GRR	Ingham	58 min
May 10, 1:23 AM EDT	Special Weather Statement	GRR	Mecosta, Newaygo	82 min
May 10, 2:40 AM EDT	Special Weather Statement	GRR	Gratiot, Isabella, Montcalm	2 hr
May 10, 2:57 AM EDT	Special Weather Statement	GRR	Clinton, Ionia	2 hr
May 10, 6:13 AM EDT	Special Weather Statement	GRR	Jackson	77 min
May 10, 7:56 AM EDT	Special Weather Statement	GRR	Ingham	64 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.