Alert archive / Michigan / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 121, NWS Grand Rapids, MI

July 30, 2006Kent County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 30, 2006, 11:59 AM EDT for Kent County, Michigan. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 30, 2006, 11:59 AM EDT (15:59 UTC)
Expired: Jul 30, 2006, 12:33 PM EDT
In force: 34 min
Issued by: NWS Grand Rapids, MI
Area: Counties, with a storm outline in the text

County Kent County, MI

The radar

The Grand Rapids radar (KGRR), 15 km from the middle of the area, began a volume at 16:03 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.

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 30, 9:27 AM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 4.0 hours before the alert went out and 176 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: 866 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 1156 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

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 30, 7:48 AM EDT, 4 hours 11 minutes earlier.

Area forecast discussion, Jul 30, 7:48 AM EDT, 4 hours 11 minutes before

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Hazardous weather outlook, Jul 30, 11:25 AM EDT, 34 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1125 AM EDT SUN JUL 30 2006

LMZ844>849-MIZ037>040-043>046-050>052-056>059-064>067-071>074-311000-
ST JOSEPH TO SOUTH HAVEN-SOUTH HAVEN TO HOLLAND-
HOLLAND TO GRAND HAVEN-GRAND HAVEN TO WHITEHALL-
WHITEHALL TO PENTWATER-PENTWATER TO MANISTEE-MASON-LAKE-OSCEOLA-
CLARE-OCEANA-NEWAYGO-MECOSTA-ISABELLA-MUSKEGON-MONTCALM-GRATIOT-
OTTAWA-KENT-IONIA-CLINTON-ALLEGAN-BARRY-EATON-INGHAM-VAN BUREN-
KALAMAZOO-CALHOUN-JACKSON-
1125 AM EDT SUN JUL 30 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST LOWER
MICHIGAN.

.DAY ONE...THIS AFTERNOON AND TONIGHT
SEVERE THUNDERSTORMS ARE EXPECTED TODAY. A LINE OF STRONG TO
SEVERE STORMS MOVING SOUTHEAST ACROSS LAKE MICHIGAN WILL BE
CAPABLE OF PRODUCING WIND GUSTS OVER 60 MPH...BRIEF HEAVY RAIN...
AND FREQUENT DEADLY LIGHTNING OVER THE LAKE AND OVER MUCH OF
SOUTHWEST MICHIGAN. AFTER THE STORMS MOVE ONSHORE...THERE WILL BE
AN ENHANCED RIP CURRENT THREAT AT THE AREA BEACHES THIS AFTERNOON
AND EVENING.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY
BOTH MONDAY AND TUESDAY AFTERNOON TEMPERATURES SHOULD REACH THE
MID TO UPPER 90S INLAND OF LAKE MICHIGAN. DEW POINTS SHOULD REMAIN
IN THE LOWER TO MID 70S DURING THAT TIME. THIS COMBINATION OF HEAT
AND HUMIDITY WOULD RESULT IN HEAT INDICES NEAR 105 DEGREES FOR
SEVERAL HOURS BOTH AFTERNOONS. A HEAT ADVISORY MAY BE NEEDED FOR
MONDAY AND TUESDAY AFTERNOONS.

THERE IS A CHANCE OF THUNDERSTORMS FROM TUESDAY NIGHT INTO EARLY
THURSDAY MORNING. THE GREATEST RISK OF ORGANIZED STRONG TO SEVERE
STORM WILL BE AHEAD OF A CANADIAN COLD FRONT THAT WILL COOL THINGS
OF SIGNIFICANTLY BY THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS EXPECTED TODAY AND WILL BE POSSIBLE AGAIN
WEDNESDAY AFTERNOON AND EVENING.

WDM TJT

In the hours before

Local storm report, Jul 30, 11:39 AM EDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1139 AM EDT SUN JUL 30 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1020 AM     MARINE TSTM WIND 8 NW LUDINGTON          44.04N 86.56W
07/30/2006  M45.00 MPH       LMZ849             MI   OFFICIAL NWS OBS

            MEASURED AT BIG SABLE POINT

&&

NJJ

Special weather statement, Jul 30, 11:41 AM EDT, 18 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1141 AM EDT SUN JUL 30 2006

MIZ044-045-050-051-056-057-064-301615-
ALLEGAN-KENT-MECOSTA-MONTCALM-MUSKEGON-NEWAYGO-OTTAWA-
1141 AM EDT SUN JUL 30 2006

...SPECIAL WEATHER STATEMENT...

AT 1135 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM BIG RAPIDS TO
SAUGATUCK...MOVING EAST AT 25 MPH.

WINDS UP TO 50 MPH...CONTINUOUS CLOUD TO GROUND LIGHTNING...AND BRIEF
HEAVY DOWNPOURS ARE EXPECTED WITH THESE STORMS.

THE STORMS WILL REACH HOWARD CITY AT 1150 AM...GRAND RAPIDS 1215
PM...AND ALLEGAN AT 1230 PM.

STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES...AND MOVE INDOORS
IF POSSIBLE. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE
OBJECTS TO BLOW AROUND.

HEAVY RAINFALL CAN LEAD TO FLOODING OF LOW LYING AREAS SUCH AS
DITCHES AND UNDERPASSES.

SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAS PASSED.

OSTUNO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 9:11 AM EDT	Special Marine Warning	GRR		64 min
Jul 30, 9:32 AM EDT	Severe Thunderstorm Warning	GRR	Mason, Oceana	88 min
Jul 30, 10:13 AM EDT	Special Marine Warning	GRR		62 min
Jul 30, 10:34 AM EDT	Severe Thunderstorm Warning	GRR	Muskegon	56 min
Jul 30, 11:08 AM EDT	Severe Thunderstorm Warning	GRR	Newaygo	37 min
Jul 30, 11:13 AM EDT	Special Marine Warning	GRR		105 min
Jul 30, 12:08 PM EDT	Severe Thunderstorm Warning	GRR	Ionia, Montcalm	52 min
Jul 30, 12:20 PM EDT	Special Marine Warning	GRR		55 min
Jul 30, 12:37 PM EDT	Severe Thunderstorm Warning	GRR	Gratiot	38 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2006 Every severe thunderstorm warning in 2006

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.