Alert archive / Michigan / Flood Watches in 2018

Flood Watch 1, NWS Grand Rapids, MI

February 18, 201823 counties in Michigan

NWS Grand Rapids, MI issued this flood watch at Feb 18, 2018, 3:02 PM EST for 23 counties in Michigan. It took effect at Feb 19, 2018, 12:00 PM EST. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued
Feb 18, 2018, 3:02 PM EST (20:02 UTC)
In effect from
Feb 19, 2018, 12:00 PM EST
Expired
Feb 20, 2018, 11:40 AM EST
In force
24 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 20:03 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 nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.0 hours before the alert went out and 266 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 2018-02-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2018-02-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 square meters per square second.1939587897117136156Sfc1 km3 km6 km9 kmRMLM
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
1277 m above ground
0-6 km bulk shear
84 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
214 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 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 Feb 18, 1:05 PM EST, 1 hour 57 minutes earlier.

Area forecast discussion, Feb 18, 1:05 PM EST, 1 hour 57 minutes before
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Hazardous weather outlook, Feb 18, 11:12 AM EST, 3 hours 50 minutes before
HAZARDOUS WEATHER OUTLOOK
National Weather Service Grand Rapids MI
1112 AM EST Sun Feb 18 2018

MIZ037>040-043>046-050>052-056>059-064>067-071>074-191000-
Mason-Lake-Osceola-Clare-Oceana-Newaygo-Mecosta-Isabella-Muskegon-
Montcalm-Gratiot-Ottawa-Kent-Ionia-Clinton-Allegan-Barry-Eaton-
Ingham-Van Buren-Kalamazoo-Calhoun-Jackson-
1112 AM EST Sun Feb 18 2018

This hazardous weather outlook is for portions of southwest Lower
Michigan.

.DAY ONE...Today and Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Several rounds of heavy rain are forecasted Monday through Tuesday
Night. Water levels will likely be elevated ahead of the rain due
to the ongoing snow melt. There will likely still be some ice in
the rivers. All this will support an increased risk for flooding
for much of the week.

Thunderstorms will be possible Monday afternoon into Tuesday night.
Any stronger storm could contain gusty winds.

Wind gusts may top 40 mph mainly Tuesday afternoon or evening.
This could lead to scattered power outages.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

MJS NJJ

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 18, 12:57 PM ESTRiver Flood WarningGRRKent14 days
Feb 18, 12:57 PM ESTRiver Flood WarningGRROttawa13 days
Feb 18, 12:57 PM ESTRiver Flood WarningGRRIngham7 days
Feb 18, 12:57 PM ESTRiver Flood WarningGRRIngham8 days
Feb 18, 12:57 PM ESTRiver Flood WarningGRRClinton15 days
Feb 18, 12:57 PM ESTRiver Flood WarningGRRClinton11 days
Feb 18, 12:57 PM ESTRiver Flood WarningGRRKalamazoo9 days
Feb 18, 1:18 PM ESTRiver Flood AdvisoryGRRIonia24 hr
Feb 18, 1:18 PM ESTRiver Flood AdvisoryGRRKent24 hr
Feb 18, 1:18 PM ESTRiver Flood AdvisoryGRRKent24 hr
Feb 18, 1:18 PM ESTRiver Flood AdvisoryGRRIonia10 days
Feb 18, 1:18 PM ESTRiver Flood AdvisoryGRRBarry24 hr
Feb 18, 1:18 PM ESTRiver Flood AdvisoryGRRKent6 days

Nearby

Flood Watches in Michigan, 2018Every 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.