Alert archive / Michigan / Flood Watches in 2018

Flood Watch 4, NWS Grand Rapids, MI

September 1, 201823 counties in Michigan

NWS Grand Rapids, MI issued this flood watch at Sep 1, 2018, 12:43 PM EDT for 23 counties in Michigan. It took effect at Sep 1, 2018, 8:00 PM EDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Sep 1, 2018, 12:43 PM EDT (16:43 UTC)
In effect from: Sep 1, 2018, 8:00 PM EDT
Expired: Sep 2, 2018, 7:10 AM EDT
In force: 11 hr
Issued by: NWS Grand Rapids, MI
Flood severity: None

All 23 counties

Allegan County, MI, Barry County, MI, Calhoun County, MI, Clare County, MI, Clinton County, MI, Eaton County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lake County, MI, Mason County, MI, Mecosta County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Osceola County, MI, Ottawa County, MI, Van Buren County, MI

The radar

The Grand Rapids radar (KGRR), 27 km from the middle of the area, began a volume at 16:46 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 nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 4.7 hours before the alert went out and 165 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: 214 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 1058 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: -12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flood watch 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 flood watch went out at Sep 1, 11:38 AM EDT, 1 hour 5 minutes earlier.

Area forecast discussion, Sep 1, 11:38 AM EDT, 1 hour 5 minutes before

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Hazardous weather outlook, Sep 1, 4:10 AM EDT, 8 hours 33 minutes before

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In the hours before

Special weather statement, Sep 1, 9:59 AM EDT, 2 hours 44 minutes before

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Local storm report, Sep 1, 10:22 AM EDT, 2 hours 21 minutes before

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Local storm report, Sep 1, 11:03 AM EDT, 1 hour 40 minutes before

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Local storm report, Sep 1, 11:08 AM EDT, 1 hour 35 minutes before

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Local storm report, Sep 1, 11:17 AM EDT, 1 hour 26 minutes before

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Local storm report, Sep 1, 12:38 PM EDT, 5 minutes 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
Sep 1, 9:04 AM EDT	Special Weather Statement	GRR	Mason, Muskegon, Oceana	56 min
Sep 1, 9:59 AM EDT	Special Weather Statement	GRR	Muskegon, Oceana, Ottawa	61 min
Sep 1, 11:07 AM EDT	Areal Flood Advisory	GRR	Muskegon	6 hr
Sep 1, 1:58 PM EDT	Special Weather Statement	GRR	Barry, Eaton	2 hr
Sep 1, 2:55 PM EDT	Special Weather Statement	GRR	Jackson	50 min
Sep 1, 6:01 PM EDT	Special Weather Statement	GRR	Calhoun	44 min
Sep 1, 6:28 PM EDT	Special Weather Statement	GRR	Kalamazoo	47 min
Sep 1, 6:34 PM EDT	Severe Thunderstorm Warning	GRR	Allegan, Barry, Kalamazoo	41 min
Sep 1, 6:47 PM EDT	Special Weather Statement	GRR	Jackson	88 min
Sep 1, 6:55 PM EDT	Special Weather Statement	GRR	Ingham	65 min
Sep 1, 6:56 PM EDT	Tornado Warning	GRR	Barry, Kalamazoo	20 min
Sep 1, 7:21 PM EDT	Severe Thunderstorm Warning	GRR	Calhoun	54 min
Sep 1, 7:27 PM EDT	Tornado Warning	GRR	Calhoun	48 min
Sep 1, 7:39 PM EDT	Severe Thunderstorm Warning	GRR	Ingham	29 min
Sep 1, 7:48 PM EDT	Severe Thunderstorm Warning	GRR	Jackson	42 min
Sep 1, 7:53 PM EDT	Tornado Warning	GRR	Mecosta	37 min

Nearby

Flood Watches in Michigan, 2018 Every flood watch in 2018

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.