Alert archive / Michigan / Special Weather Statements in 2021

Special Weather Statement, NWS Detroit, MI

July 20, 2021Lapeer County, Michigan

NWS Detroit, MI issued this special weather statement at Jul 20, 2021, 4:27 PM EDT for Lapeer County, Michigan. It was in force for 93 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: Jul 20, 2021, 4:27 PM EDT (20:27 UTC)
Expired: Jul 20, 2021, 6:00 PM EDT
In force: 93 min
Issued by: NWS Detroit, MI

County Lapeer County, MI

The radar

The Detroit radar (KDTX), 73 km from the middle of the area, began a volume at 20:27 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, 8.5 hours before the alert went out and 69 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: 151 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 1105 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 16 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 Jul 20, 3:30 PM EDT, 57 minutes earlier.

Area forecast discussion, Jul 20, 3:30 PM EDT, 57 minutes before

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Hazardous weather outlook, Jul 20, 3:43 PM EDT, 44 minutes before

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In the hours before

Special weather statement, Jul 20, 2:29 PM EDT, 1 hour 58 minutes before

Special Weather Statement
National Weather Service Detroit/Pontiac MI
229 PM EDT Tue Jul 20 2021

MIZ049-202000-
Huron-
229 PM EDT Tue Jul 20 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN HURON COUNTY...

At 229 PM EDT, a strong thunderstorm was located 8 miles northwest of
Port Austin, moving southeast at 25 mph.

Winds in excess of 40 mph and pea size hail are possible with this
storm.

This storm will be near...
  Port Austin around 245 PM EDT.
  Kinde around 300 PM EDT.
  Port Hope around 320 PM EDT.

Other locations impacted by this storm include Pinnebog, Port
Crescent State Park, Grindstone City, Redman, Filion and Huron City.

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

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 4400 8270 4386 8261 4387 8338 4392 8344
      4394 8342 4395 8334 4399 8329 4403 8310
      4407 8305 4407 8286
TIME...MOT...LOC 1829Z 310DEG 23KT 4414 8310

AM

Special weather statement, Jul 20, 3:35 PM EDT, 52 minutes before

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Local storm report, Jul 20, 3:58 PM EDT, 29 minutes before

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Special weather statement, Jul 20, 4:27 PM EDT, 0 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
Jul 19, 9:54 PM EDT	Small Craft Advisory	DTX		42 hr
Jul 19, 9:59 PM EDT	Beach Hazards Statement	DTX	Bay, Huron, Saint Clair, Sanilac	26 hr
Jul 20, 2:19 PM EDT	Special Marine Warning	DTX		73 min
Jul 20, 2:29 PM EDT	Special Weather Statement	DTX	Huron	91 min
Jul 20, 2:57 PM EDT	Severe Thunderstorm Warning	DTX	Huron	51 min
Jul 20, 3:06 PM EDT	Special Marine Warning	DTX		84 min
Jul 20, 3:35 PM EDT	Special Weather Statement	DTX	Sanilac	55 min
Jul 20, 4:57 PM EDT	Severe Thunderstorm Warning	DTX	Lapeer	63 min
Jul 20, 5:59 PM EDT	Severe Thunderstorm Warning	DTX	Lapeer, Macomb, Oakland, Saint Clair	61 min
Jul 20, 6:43 PM EDT	Severe Thunderstorm Warning	DTX	Macomb, Oakland	62 min
Jul 20, 6:59 PM EDT	Special Weather Statement	DTX	Livingston, Oakland	61 min
Jul 20, 7:28 PM EDT	Severe Thunderstorm Warning	DTX	Oakland, Wayne	62 min
Jul 20, 7:53 PM EDT	Special Weather Statement	DTX	Washtenaw	97 min

Nearby

Special Weather Statements in Michigan, 2021 Every special weather statement 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.