Alert archive / Michigan / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 40, NWS Grand Rapids, MI

July 15, 2010Gratiot County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 15, 2010, 2:49 PM EDT for Gratiot 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 counties it named.

The facts

Issued: Jul 15, 2010, 2:49 PM EDT (18:49 UTC)
Expired: Jul 15, 2010, 3:14 PM EDT
In force: 25 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Gratiot County, MI

The radar

The Grand Rapids radar (KGRR), 88 km from the middle of the area, began a volume at 18:51 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 15, 1:30 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 6.8 hours before the alert went out and 115 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: 115 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 1003 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 121 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 15, 2:04 PM EDT, 45 minutes earlier.

Area forecast discussion, Jul 15, 2:04 PM EDT, 45 minutes before

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Hazardous weather outlook, Jul 15, 1:05 PM EDT, 1 hour 44 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
105 PM EDT THU JUL 15 2010

MIZ037>040-043>046-050>052-056>059-064>067-071>074-161100-
MASON-LAKE-OSCEOLA-CLARE-OCEANA-NEWAYGO-MECOSTA-ISABELLA-MUSKEGON-
MONTCALM-GRATIOT-OTTAWA-KENT-IONIA-CLINTON-ALLEGAN-BARRY-EATON-
INGHAM-VAN BUREN-KALAMAZOO-CALHOUN-JACKSON-
105 PM EDT THU JUL 15 2010

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

.DAY ONE...TODAY AND TONIGHT

A SLIGHT RISK OF SEVERE WEATHER EXISTS THIS AFTERNOON AND EARLY
EVENING SOUTH AND EAST OF A MUSKEGON TO CADILLAC LINE. THE MAIN
THREATS ARE STRONG DAMAGING WINDS IN EXCESS OF 60 MPH AND TORRENTIAL
RAIN WITH LOCALIZED ONE TO TWO INCH PER HOUR RAINFALL RATES. CELL
MOVEMENT WILL BE EAST NORTHEAST AT AROUND 40 MPH.

HEAT INDEX VALUES WILL PUSH TOWARD 100 DEGREES THIS AFTERNOON ACROSS
SOUTHERN LOWER MICHIGAN.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE IS CHANCE OF THUNDERSTORMS ON SUNDAY AND SUNDAY NIGHT. SOME OF
THESE STORMS MAY BE SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED FROM 2 PM TO 9 PM...
ESPECIALLY EAST OF HIGHWAY 131.

LMZ844>849-161100-
ST JOSEPH TO SOUTH HAVEN MI-SOUTH HAVEN TO HOLLAND MI-
HOLLAND TO GRAND HAVEN MI-GRAND HAVEN TO WHITEHALL MI-
WHITEHALL TO PENTWATER MI-PENTWATER TO MANISTEE MI-
105 PM EDT THU JUL 15 2010

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

.DAY ONE...TODAY AND TONIGHT

STRONG TO SEVERE STORMS ARE EXPECTED TODAY...WITH THE HIGHEST
THREAT BEING SOUTH OF WHITEHALL. STORMS WILL BE CAPABLE OF STRONG
WINDS IN EXCESS OF 50 KNOTS...TORRENTIAL RAINS AND CLOUD TO WATER
LIGHTNING STRIKES.

A VERY HUMID AIR MASS WILL LEAD TO AREAS OF FOG AND HAZE ON LAKE
MICHIGAN WHICH MAY REDUCE VISIBILITIES TO BELOW A MILE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE IS CHANCE OF THUNDERSTORMS ON SUNDAY AND SUNDAY NIGHT. SOME OF
THESE STORMS MAY BE SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED FROM 2 PM TO 6 PM.

DUKE/MEADE

In the hours before

Special weather statement, Jul 15, 9:07 AM EDT, 5 hours 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
907 AM EDT THU JUL 15 2010

MIZ044-050-151400-
MUSKEGON-NEWAYGO-
907 AM EDT THU JUL 15 2010

...SIGNIFICANT WEATHER ADVISORY...

AT 904 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 9 MILES WEST OF MUSKEGON...MOVING EAST AT 40 MPH.

HAIL UP TO DIME SIZE... WINDS GREATER THAN 40 MPH... FREQUENT CLOUD
TO GROUND LIGHTNING... AND HEAVY DOWNPOURS ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
  ROOSEVELT PARK...     MONTAGUE...           WHITEHALL...
  MUSKEGON...           CLOVERVILLE...        DALTON...
  LAKEWOOD CLUB...      TWIN LAKE...          WOLF LAKE...
  BRUNSWICK...          HOLTON...             REEMAN...
  BRIDGETON...          FREMONT...            ASHLAND TWP...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW
AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK
SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.

&&

LAT...LON 4344 8643 4351 8556 4330 8557 4329 8579
      4323 8580 4316 8630 4343 8646
TIME...MOT...LOC 1306Z 257DEG 34KT 4326 8640

MEADE

Special weather statement, Jul 15, 9:53 AM EDT, 4 hours 56 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
953 AM EDT THU JUL 15 2010

MIZ044-045-051-151500-
MECOSTA-MONTCALM-NEWAYGO-
953 AM EDT THU JUL 15 2010

...SIGNIFICANT WEATHER ADVISORY...

AT 949 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 10 MILES SOUTHWEST
OF BIG RAPIDS TO 4 MILES EAST OF NEWAYGO TO 12 MILES SOUTHWEST OF
NEWAYGO...MOVING EAST AT 40 MPH.

WINDS GREATER THAN 40 MPH...FREQUENT CLOUD TO GROUND LIGHTNING...
BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
  ASHLAND TWP...        BIG RAPIDS...         GRANT...
  STANWOOD...           COLFAX TWP...         RODNEY...
  MORLEY...             ENSLEY TWP...         CHIPPEWA LAKE...
  ALTONA...             MECOSTA...            BARRYTON...
  CORAL...              HOWARD CITY...        AMBLE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW
AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK
SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED.

&&

LAT...LON 4381 8511 4360 8510 4336 8511 4331 8604
      4342 8592 4364 8568
TIME...MOT...LOC 1353Z 252DEG 36KT 4362 8558 4341 8567
          4333 8595

NJJ

Local storm report, Jul 15, 11:46 AM EDT, 3 hours 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1146 AM EDT THU JUL 15 2010

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

1146 AM     HEAVY RAIN       MONTAGUE                43.41N 86.36W
07/15/2010  M1.55 INCH       MUSKEGON           MI   CO-OP OBSERVER

            24 HOUR TOTAL.

&&

OSTUNO

Special weather statement, Jul 15, 12:43 PM EDT, 2 hours 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1243 PM EDT THU JUL 15 2010

MIZ039-040-151745-
CLARE-OSCEOLA-
1243 PM EDT THU JUL 15 2010

...SIGNIFICANT WEATHER ADVISORY...

AT 1240 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 25 MILES WEST OF HARRISON...MOVING EAST AT 40
MPH.

ONE HALF INCH DIAMETER HAIL...WINDS GREATER THAN 40 MPH...FREQUENT
CLOUD TO GROUND LIGHTNING...ARE POSSIBLE WITH THIS STORM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW
AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK
SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.

&&

LAT...LON 4417 8460 4402 8461 4389 8543 4402 8549
      4418 8494 4417 8493
TIME...MOT...LOC 1643Z 252DEG 36KT 4398 8535

OSTUNO

Special weather statement, Jul 15, 2:21 PM EDT, 28 minutes before

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Local storm report, Jul 15, 2:48 PM EDT, 1 minute before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 10:31 PM EDT	Special Marine Warning	GRR		104 min
Jul 15, 2:13 AM EDT	Special Marine Warning	GRR		107 min
Jul 15, 4:02 AM EDT	Special Marine Warning	GRR		88 min
Jul 15, 4:44 AM EDT	Special Weather Statement	GRR	Allegan, Ottawa	61 min
Jul 15, 9:07 AM EDT	Special Weather Statement	GRR	Muskegon	53 min
Jul 15, 9:53 AM EDT	Special Weather Statement	GRR	Mecosta	67 min
Jul 15, 12:43 PM EDT	Special Weather Statement	GRR	Clare, Osceola	62 min
Jul 15, 2:21 PM EDT	Special Weather Statement	GRR	Gratiot	54 min
Jul 15, 3:16 PM EDT	Severe Thunderstorm Warning	GRR	Clinton, Gratiot	44 min
Jul 15, 3:42 PM EDT	Severe Thunderstorm Warning	GRR	Clinton	35 min
Jul 15, 3:49 PM EDT	Severe Thunderstorm Warning	GRR	Calhoun	41 min
Jul 15, 3:56 PM EDT	Special Weather Statement	GRR	Clinton	64 min
Jul 15, 4:08 PM EDT	Severe Thunderstorm Warning	GRR	Calhoun, Kalamazoo	52 min
Jul 15, 4:26 PM EDT	Special Weather Statement	GRR	Ingham	64 min
Jul 15, 4:29 PM EDT	Severe Thunderstorm Warning	GRR	Calhoun, Jackson, Kalamazoo	46 min
Jul 15, 4:34 PM EDT	Areal Flood Advisory	GRR	Calhoun, Jackson	6 hr
Jul 15, 5:00 PM EDT	Flash Flood Warning	GRR	Calhoun, Ingham, Jackson	6 hr
Jul 15, 5:16 PM EDT	Severe Thunderstorm Warning	GRR	Calhoun, Ingham, Jackson	44 min
Jul 15, 6:18 PM EDT	Special Weather Statement	GRR	Kalamazoo	57 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2010 Every severe thunderstorm warning in 2010

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.