Alert archive / Michigan / Flash Flood Warnings in 2022

Flash Flood Warning 2, NWS Gaylord, MI

August 20, 2022Arenac County, Michigan

NWS Gaylord, MI issued this flash flood warning at Aug 20, 2022, 3:01 PM EDT for Arenac County, Michigan. It was in force for 119 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 20, 2022, 3:01 PM EDT (19:01 UTC)
Expired: Aug 20, 2022, 5:00 PM EDT
In force: 119 min
Issued by: NWS Gaylord, MI
Area: Storm-based polygon
Flood severity: None

County Arenac County, MI

The radar

The NCL Michigan radar (KAPX), 123 km from the middle of the area, began a volume at 19:01 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, 7.0 hours before the alert went out and 145 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: 221 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1319 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

227 
WGUS53 KAPX 201901
FFWAPX
MIC011-202100-
/O.NEW.KAPX.FF.W.0002.220820T1901Z-220820T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Gaylord MI
301 PM EDT Sat Aug 20 2022

The National Weather Service in Gaylord has issued a

* Flash Flood Warning for...
  South Central Arenac County in northern Michigan...

* Until 500 PM EDT.

* At 301 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. The expected rainfall rate is 2 to 3 inches in 1 
  hour. Flash flooding is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Standish and Omer.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4397 8397 4405 8389 4405 8382 4400 8380
      4399 8381 4400 8382 4399 8383 4400 8383
      4399 8384 4397 8386 4396 8388 4393 8389
      4393 8390 4393 8395 4395 8397 4396 8397

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...2-3 INCHES IN 1 HOUR

$$

JPB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 1:49 PM EDT	Special Marine Warning	APX		56 min
Aug 20, 2:44 PM EDT	Special Marine Warning	APX		46 min

Nearby

Flash Flood Warnings in Michigan, 2022 Every flash flood warning in 2022

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.