Alert archive / Michigan / Special Weather Statements in 2017

Special Weather Statement, NWS Detroit, MI

August 3, 2017Lapeer County, Michigan

NWS Detroit, MI issued this special weather statement at Aug 3, 2017, 1:28 PM EDT for Lapeer County, Michigan. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 3, 2017, 1:28 PM EDT (17:28 UTC)
Expired: Aug 3, 2017, 2:15 PM EDT
In force: 47 min
Issued by: NWS Detroit, MI

County Lapeer County, MI

The radar

The Detroit radar (KDTX), 32 km from the middle of the area, began a volume at 17:31 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, 5.5 hours before the alert went out and 28 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: 588 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 944 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 3, 11:59 AM EDT, 1 hour 29 minutes earlier.

Area forecast discussion, Aug 3, 11:59 AM EDT, 1 hour 29 minutes before

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Hazardous weather outlook, Aug 3, 3:26 AM EDT, 10 hours 2 minutes before

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In the hours before

Local storm report, Aug 3, 10:30 AM EDT, 2 hours 58 minutes before

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Special weather statement, Aug 3, 12:52 PM EDT, 36 minutes before

Special Weather Statement
National Weather Service Detroit/Pontiac MI
1252 PM EDT THU AUG 3 2017

MIZ070-031730-
Macomb-
1252 PM EDT THU AUG 3 2017

...A STRONG THUNDERSTORM WILL AFFECT MACOMB COUNTY...

At 1251 PM EDT, a strong thunderstorm was located near Sterling
Heights, or 7 miles northwest of Mount Clemens, moving northeast at
15 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

This storm will be near...
  Mount Clemens around 105 PM EDT.
  Macomb Township around 110 PM EDT.
  New Baltimore, Richmond and Armada around 130 PM EDT.

Other locations impacted by this storm include New Haven, Shelby
Township, Ray Center, Chesterfield Township, Clinton Township, Utica,
Washington and Fraser.

Heavy rainfall is also occurring with this storm, and may cause
localized ponding of area roads. Do not drive your vehicle through
flooded roadways.

LAT...LON 4252 8301 4259 8309 4272 8309 4290 8288
      4289 8284 4280 8273 4271 8273 4269 8271
      4267 8271 4269 8270 4268 8266
TIME...MOT...LOC 1651Z 229DEG 13KT 4265 8301

RBP

Special weather statement, Aug 3, 1:28 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Detroit/Pontiac MI
128 PM EDT THU AUG 3 2017

MIZ062-069-070-031815-
Macomb-Lapeer-Oakland-
128 PM EDT THU AUG 3 2017

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT SOUTHERN LAPEER...
NORTHEASTERN OAKLAND AND NORTHWESTERN MACOMB COUNTIES...

At 126 PM EDT, radar indicated the leading edge of an area of strong
thunderstorms was located along a line extending from near Hadley to
near Oxford. Movement was northeast at 5 mph.

These storms will be near...
  Lapeer, Romeo, Almont, Dryden and Metamora around 215 PM EDT.

Other locations impacted by these storms include Leonard, Lakeville,
Lake Orion, Attica, Thornville and Elba.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4271 8318 4287 8349 4288 8345 4301 8346
      4314 8336 4294 8298 4289 8298 4289 8290
      4286 8284
TIME...MOT...LOC 1726Z 224DEG 6KT 4291 8340 4280 8320

RBP

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 8:21 PM EDT	Special Weather Statement	DTX	Genesee	39 min
Aug 2, 8:53 PM EDT	Areal Flood Advisory	DTX	Genesee	112 min
Aug 3, 12:52 PM EDT	Special Weather Statement	DTX	Macomb	38 min
Aug 3, 1:36 PM EDT	Severe Thunderstorm Warning	DTX	Lapeer, Macomb, Oakland	58 min
Aug 3, 2:29 PM EDT	Areal Flood Advisory	DTX	Macomb	3 hr
Aug 3, 2:32 PM EDT	Special Weather Statement	DTX	Oakland	28 min
Aug 3, 3:06 PM EDT	Special Weather Statement	DTX	Sanilac	24 min
Aug 3, 4:05 PM EDT	Gale Watch	DTX		12 hr
Aug 3, 4:05 PM EDT	Small Craft Advisory	DTX		54 hr
Aug 3, 4:27 PM EDT	Special Weather Statement	DTX	Oakland	33 min
Aug 3, 5:12 PM EDT	Special Weather Statement	DTX	Macomb, Saint Clair	63 min
Aug 3, 5:17 PM EDT	Special Weather Statement	DTX	Livingston, Oakland, Washtenaw	58 min
Aug 3, 6:08 PM EDT	Special Weather Statement	DTX	Genesee, Saginaw, Shiawassee	67 min
Aug 3, 6:17 PM EDT	Areal Flood Advisory	DTX	Macomb, Oakland	3 hr
Aug 3, 6:28 PM EDT	Special Weather Statement	DTX	Oakland	62 min
Aug 3, 7:13 PM EDT	Special Weather Statement	DTX	Bay, Midland	62 min
Aug 3, 7:31 PM EDT	Special Weather Statement	DTX	Wayne	29 min

Nearby

Special Weather Statements in Michigan, 2017 Every special weather statement in 2017

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.