Alert archive / Michigan / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 91, NWS Grand Rapids, MI

July 21, 2003Jackson County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 21, 2003, 1:50 AM EDT for Jackson County, Michigan. It was in force for 25 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: Jul 21, 2003, 1:50 AM EDT (05:50 UTC)
Expired: Jul 21, 2003, 2:15 AM EDT
In force: 25 min
Issued by: NWS Grand Rapids, MI
Area: Counties, with a storm outline in the text

County Jackson County, MI

The radar

The Detroit radar (KDTX), 80 km from the middle of the area, began a volume at 05:52 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 21, 12:45 AM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 5.8 hours before the alert went out and 84 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: 1227 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 788 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

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

078 
WUUS53 KGRR 210550
SVRGRR
MIC075-210615-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
149 AM EDT MON JUL 21 2003

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A

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

* UNTIL 215 AM EDT

* AT 146 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 3 MILES SOUTHWEST OF BROOKLYN...OR ABOUT 9
  MILES SOUTHEAST OF VANDERCOOK LAKE...MOVING EAST AT 45 MPH. THIS   
  STORM WILL BE PASSING THROUGH COLUMBIA AND NORVEL TOWNSHIPS        
  THROUGH 215 AM.

LARGE HAIL...DAMAGING WINDS...AND HEAVY RAIN ARE EXPECTED FROM THIS
STORM. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THE STORM HAS PASSED.


LAT...LON 4217 8435 4199 8433 4201 8357 4223 8359

$$

JK RJD

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Rapids, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 20, 7:53 PM EDT, 5 hours 57 minutes earlier.

Area forecast discussion, Jul 20, 7:53 PM EDT, 5 hours 57 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
753 PM EDT SUN JUL 20 2003

WERE GOING TO ISSUE A QUICK ZONE UPDATE TO INCLUDE MENTION OF THE SEVERE
THUNDERSTORM WATCH WHICH IS NOW IN EFFECT FOR OUR ENTIRE CWA UNTIL
1 AM EDT MONDAY. THUNDERSTORMS WILL CONTINUE TO DEVELOP ACROSS OUR CWA THROUGH
THE NIGHT AS THE MAIN SFC LOW NEAR GRB DEEPENS AND MOVES ACROSS LWR MI. DEW
POINTS HAVE CLIMBED INTO THE LOWER 70S ACROSS MUCH OF OUR CWA EARLY THIS
EVENING SOUTH OF THE WARM FRONT. SEVERAL IMPULSES OF UPPER ENERGY WILL CONTINUE
TO TRIGGER ADDITIONAL TSTORM DEVELOPMENT THROUGH THE NIGHT.

LAURENS

.GRR...SEVERE THUNDERSTORM WATCH IN EFFECT FOR ALL OF OUR CWA UNTIL
1 AM EDT MONDAY.

Hazardous weather outlook, Jul 20, 12:45 PM EDT, 13 hours 5 minutes before

MIZ037>040-043>046-050>052-056>059-064>067-071>074-211000-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1245 PM EDT SUN JUL 20 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE SOUTHWEST QUARTER OF LOWER
MICHIGAN.

.DAY ONE...TODAY AND TONIGHT

A SLIGHT RISK OF SEVERE THUNDERSTORMS EXISTS FOR ALL OF SOUTHWEST
LOWER MICHIGAN THIS AFTERNOON THROUGH TONIGHT AS A STORM SYSTEM
TAKES SHAPE ACROSS THE MIDWEST. THUNDERSTORMS THAT DEVELOP WILL MOVE
SOUTHEAST AT 35 TO 40 MPH AND WILL BE CAPABLE OF PRODUCING HAIL UP
TO THREE QUARTERS OF AN INCH IN DIAMETER AND WIND GUSTS TO 60 MPH.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

SCATTERED THUNDERSTORMS ARE POSSIBLE ON MONDAY MORNING AS A COLD
FRONT PUSHES EAST. THUNDERSTORMS ARE POSSIBLE ON SATURDAY AS ANOTHER
COLD FRONT APPROACHES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON OR EVENING.

OSTUNO 93

In the hours before

Special weather statement, Jul 20, 7:52 PM EDT, 5 hours 58 minutes before

MIZ037>040-043>046-050>052-056>059-064>067-071>074-210445-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
752 PM EDT SUN JUL 20 2003

THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH
FOR THE SOUTHWEST QUARTER OF LOWER MICHIGAN EFFECTIVE UNTIL 100 AM
EDT MONDAY MORNING. THIS WATCH INCLUDES THE FOLLOWING COUNTIES

IN WEST CENTRAL MICHIGAN
     MASON...LAKE...OCEANA...NEWAYGO AND MUSKEGON

IN CENTRAL MICHIGAN
     OSCEOLA...CLARE...ISABELLA...MECOSTA...MONTCALM AND GRATIOT

IN SOUTHWEST MICHIGAN
     KENT...ALLEGAN...BARRY...KALAMAZOO...VAN BUREN AND OTTAWA

IN SOUTH CENTRAL MICHIGAN
     IONIA...CLINTON...INGHAM...EATON...JACKSON AND CALHOUN

THIS WATCH INCLUDES THE ADJOINING COASTAL WATERS OF AFFECTED
LAKESHORE COUNTIES.

A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR
THE DEVELOPMENT OF SEVERE THUNDERSTORMS IN AND NEAR THE WATCH AREA.
REMEMBER...SEVERE THUNDERSTORMS PRODUCE WIND GUSTS IN EXCESS OF 58
MPH AND/OR HAIL THREE-QUARTERS OF AN INCH IN DIAMETER OR GREATER. IF
YOU LIVE IN OR NEAR THE WATCH AREA YOU SHOULD REMAIN ALERT TO RAPIDLY
CHANGING WEATHER CONDITIONS. STAY TUNED TO NOAA WEATHER RADIO OR THE
LOCAL NEWS OUTLETS FOR THE LATEST UPDATES AND POSSIBLE WARNINGS.

RG

Local storm report, Jul 20, 8:00 PM EDT, 5 hours 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
0800 PM EDT SUN JUL 20 2003

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0250 PM    5 SW MARSHALL             MI   WIND DAMAGE
07/20/03   CALHOUN                        NUMEROUS TREES UPROOTED OR
                                          SNAPPED OFF NEAR 13 MILE
                                          AND F DRIVE

0250 PM    5 SW MARSHALL             MI   WIND DAMAGE
07/20/03   CALHOUN                        LARGE 2 STORY HOME PUSHED
                                          OFF OF FOUNDATION.  A
                                          COUPLE OF OUTBUILDINGS
                                          LEVELLED.

0250 PM    5 SW MARSHALL             MI   WIND DAMAGE
07/20/03   CALHOUN                        HOUSE PARTIALLY LOST ROOF.
                                          2 CAR GARAGE DESTROYED.

0140 PM    4 SW HASTINGS             MI   WIND DAMAGE
07/20/03   BARRY                          NUMEROUS TREES DOWN

0140 PM    DELTON                    MI   WIND DAMAGE
07/20/03   BARRY                          NUMEROUS TREES DOWN

RG

Special weather statement, Jul 21, 12:55 AM EDT, 55 minutes before

MIZ056>059-064>067-071>074-211000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1255 AM EDT MON JUL 21 2003

THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH
FOR PORTIONS OF THE SOUTHWEST QUARTER OF LOWER MICHIGAN EFFECTIVE
UNTIL 600 AM EDT MONDAY MORNING. THIS WATCH INCLUDES THE FOLLOWING
COUNTIES

IN SOUTHWEST MICHIGAN
     KENT...ALLEGAN...BARRY...KALAMAZOO...VAN BUREN AND OTTAWA

IN SOUTH CENTRAL MICHIGAN
     IONIA...CLINTON...INGHAM...EATON...JACKSON AND CALHOUN

THIS WATCH INCLUDES THE ADJOINING COASTAL WATERS OF AFFECTED
LAKESHORE COUNTIES.

MJS

Local storm report, Jul 21, 1:34 AM EDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
0134 AM EDT MON JUL 21 2003

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0112 AM    CLARKSVILLE               MI   1.00 IN HAIL
07/21/03   IONIA

0110 AM    2 S SARANAC               MI   WIND DAMAGE
07/21/03   IONIA                          TREE DOWN

0102 AM    LOWELL                    MI   1.00 IN HAIL
07/21/03   KENT

JK

Local storm report, Jul 21, 1:43 AM EDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
0143 AM EDT MON JUL 21 2003

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0130 AM    WOODLAND                  MI   1.50 IN HAIL
07/21/03   BARRY

JK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 9:05 PM EDT	Severe Thunderstorm Warning	GRR	Lake	55 min
Jul 20, 9:11 PM EDT	Severe Thunderstorm Warning	GRR	Lake	49 min
Jul 20, 10:51 PM EDT	Special Marine Warning	GRR		54 min
Jul 20, 10:51 PM EDT	Special Marine Warning	GRR		54 min
Jul 20, 11:48 PM EDT	Special Marine Warning	GRR		117 min
Jul 20, 11:48 PM EDT	Special Marine Warning	GRR		117 min
Jul 21, 12:38 AM EDT	Severe Thunderstorm Warning	GRR	Ionia, Kent	52 min
Jul 21, 1:18 AM EDT	Severe Thunderstorm Warning	GRR	Barry, Eaton	57 min
Jul 21, 2:36 AM EDT	Severe Thunderstorm Warning	GRR	Ingham, Jackson	54 min
Jul 21, 10:43 AM EDT	Special Marine Warning	GRR		77 min
Jul 21, 10:43 AM EDT	Special Marine Warning	GRR		77 min
Jul 21, 11:18 AM EDT	Severe Thunderstorm Warning	GRR	Muskegon	57 min
Jul 21, 11:57 AM EDT	Special Marine Warning	GRR		93 min
Jul 21, 11:57 AM EDT	Special Marine Warning	GRR		93 min
Jul 21, 11:57 AM EDT	Special Marine Warning	GRR		93 min
Jul 21, 3:55 PM EDT	Severe Thunderstorm Warning	GRR	Calhoun	35 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2003 Every severe thunderstorm warning in 2003

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.