Alert archive / Michigan / Areal Flood Warnings in 2021

Areal Flood Warning 7, NWS Detroit, MI

August 27, 2021Wayne County, Michigan

NWS Detroit, MI issued this areal flood warning at Aug 27, 2021, 4:26 PM EDT for Wayne County, Michigan. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 27, 2021, 4:26 PM EDT (20:26 UTC)
Expired: Aug 27, 2021, 10:00 PM EDT
In force: 6 hr
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Flood severity: None

County Wayne County, MI

The radar

The Detroit radar (KDTX), 49 km from the middle of the area, began a volume at 20:26 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, 8.4 hours before the alert went out and 50 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: 319 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 912 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Detroit, MI wrote its last area forecast discussion before this areal flood warning went out at Aug 27, 3:13 PM EDT, 1 hour 13 minutes earlier.

Area forecast discussion, Aug 27, 3:13 PM EDT, 1 hour 13 minutes before

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Hazardous weather outlook, Aug 27, 3:24 PM EDT, 1 hour 2 minutes before

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In the hours before

Special weather statement, Aug 27, 12:57 PM EDT, 3 hours 29 minutes before

Special Weather Statement
National Weather Service Detroit/Pontiac MI
1257 PM EDT Fri Aug 27 2021

MIZ063-070-076-271800-
Macomb MI-St. Clair MI-Wayne MI-
1257 PM EDT Fri Aug 27 2021

...Strong thunderstorms will impact portions of northeastern Wayne,
southern Macomb and southeastern St. Clair Counties through 200 PM
EDT...

At 1257 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from Sterling Heights to Warren to near Detroit.
Movement was east at 20 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Strong thunderstorms will be near...
  Sterling Heights around 100 PM EDT.
  Mount Clemens, Grosse Pointe and Macomb Township around 115 PM
  EDT.
  St. Clair Shores around 120 PM EDT.
  New Baltimore around 145 PM EDT.
  Algonac, Marine City and Harsens Island around 200 PM EDT.

Other locations impacted by these storms include Anchorville,
Highland Park, Roseville, Fraser, Utica, Eastpointe, Fair Haven,
Northeast Detroit, Harper Woods and Grosse Pointe Shores.

People attending Ford Field, Comerica Park, and Detroit Hydrofest
should seek safe shelter immediately!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4262 8251 4255 8258 4256 8264 4250 8270
      4254 8276 4254 8281 4243 8284 4236 8288
      4229 8315 4245 8314 4245 8308 4262 8309
      4283 8248 4276 8247
TIME...MOT...LOC 1657Z 252DEG 17KT 4258 8301 4249 8301 4239 8304

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

AA

Local storm report, Aug 27, 3:32 PM EDT, 54 minutes before

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Local storm report, Aug 27, 3:39 PM EDT, 47 minutes before

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Local storm report, Aug 27, 3:54 PM EDT, 32 minutes before

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Local storm report, Aug 27, 3:59 PM EDT, 27 minutes before

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Local storm report, Aug 27, 4:21 PM EDT, 5 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 9:34 PM EDT	Small Craft Advisory	DTX		30 hr
Aug 27, 4:04 AM EDT	Beach Hazards Statement	DTX	Huron	18 hr
Aug 27, 6:43 AM EDT	Special Weather Statement	DTX	Bay, Midland, Saginaw	62 min
Aug 27, 8:32 AM EDT	Areal Flood Advisory	DTX	Saginaw	3 hr
Aug 27, 10:03 AM EDT	Areal Flood Advisory	DTX	Genesee	3 hr
Aug 27, 12:08 PM EDT	Special Weather Statement	DTX	Wayne	67 min
Aug 27, 12:22 PM EDT	Special Weather Statement	DTX	Macomb	68 min
Aug 27, 12:47 PM EDT	Areal Flood Advisory	DTX	Oakland, Wayne	3 hr
Aug 27, 12:57 PM EDT	Special Weather Statement	DTX	Macomb	63 min
Aug 27, 1:02 PM EDT	Special Marine Warning	DTX		58 min
Aug 27, 1:12 PM EDT	Flash Flood Warning	DTX	Oakland, Wayne	3 hr
Aug 27, 1:56 PM EDT	Flash Flood Warning	DTX	Wayne	2 hr

Nearby

Areal Flood Warnings in Michigan, 2021 Every areal flood warning in 2021

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.