Alert archive / Michigan / Flash Flood Warnings in 2021

Flash Flood Warning 5, NWS Northern Indiana

August 10, 2021Berrien County, Michigan

NWS Northern Indiana issued this flash flood warning at Aug 10, 2021, 1:09 AM EDT for Berrien County, Michigan. It was in force for 3 hr. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 10, 2021, 1:09 AM EDT (05:09 UTC)
Expired: Aug 10, 2021, 4:15 AM EDT
In force: 3 hr
Issued by: NWS Northern Indiana
Area: Storm-based polygon
Flood severity: None

County Berrien County, MI

The radar

The Northern Indiana radar (KIWX), 93 km from the middle of the area, began a volume at 05:11 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.

What was reported inside it

Time	Report	Where	Remark
Aug 10, 1:50 AM EDT	HEAVY RAIN 6.6	1 E Bridgman, MI	130 MINUTE RAINFALL.
Aug 10, 1:54 AM EDT	HEAVY RAIN 7.44	1 Nw Bridgman, MI	UPDATED RAINFALL AMOUNT. 144 MINUTE RAINFALL.
Aug 10, 2:00 AM EDT	FLASH FLOOD	Bridgman, MI	FLOODING IN BRIDGMAN CREATED POWER OUTAGES AFTER FLOODWATERS ESSENTIALLY DESTROYED A MAJOR POWER SUBSTATION. POWER OUTAGES WERE REPORTED IN BRIDGMAN, NEW TROY AND NEW BUFFALO. BETWEEN 5 AND 8 INCHES OF RAIN FELL IN THIS AREA EARLY THIS MORNING.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 5.2 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-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: 4598 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 775 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 179 m²/s²
0-3 km storm-relative helicity: 284 m²/s²
Significant tornado parameter: 3.9
Supercell composite: 24.2

Open this sounding in Storm Lab

The text

As transmitted.

894 
WGUS53 KIWX 100509
FFWIWX
MIC021-100815-
/O.NEW.KIWX.FF.W.0005.210810T0509Z-210810T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Northern Indiana
109 AM EDT Tue Aug 10 2021

The National Weather Service in Northern Indiana has issued a

* Flash Flood Warning for...
  South Central Berrien County in southwestern Michigan...

* Until 415 AM EDT.

* At 109 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. 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...
  Bridgman, Shorewood-Tower Hills-Harbert, Baroda, Glendora and 
  Sawyer.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4197 8657 4200 8655 4198 8638 4195 8638
      4186 8646 4189 8662

FLASH FLOOD...RADAR INDICATED

$$

Marsili

2 follow-up statements

921 
WGUS73 KIWX 100618
FFSIWX

Flash Flood Statement
National Weather Service Northern Indiana
218 AM EDT Tue Aug 10 2021

MIC021-100815-
/O.CON.KIWX.FF.W.0005.000000T0000Z-210810T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berrien MI-
218 AM EDT Tue Aug 10 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 AM EDT EARLY THIS 
MORNING FOR SOUTH CENTRAL BERRIEN COUNTY...

At 216 AM EDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 4 and 7 inches of rain have 
fallen. Additional rainfall amounts up to 0.5 inches are possible in 
the warned area. 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...
  Bridgman, Shorewood-Tower Hills-Harbert, Baroda, Glendora and 
  Sawyer.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4197 8657 4200 8655 4198 8638 4195 8638
      4186 8646 4189 8662

FLASH FLOOD...RADAR INDICATED

$$

Marsili

745 
WGUS73 KIWX 100814
FFSIWX

Flash Flood Statement
National Weather Service Northern Indiana
414 AM EDT Tue Aug 10 2021

MIC021-100824-
/O.EXP.KIWX.FF.W.0005.000000T0000Z-210810T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berrien MI-
414 AM EDT Tue Aug 10 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 415 AM EDT EARLY THIS MORNING 
FOR SOUTH CENTRAL BERRIEN COUNTY...

The heavy rain has ended. Any areas of flooding will likely recede 
this morning. Please continue to heed remaining road closures.

LAT...LON 4197 8657 4200 8655 4198 8638 4195 8638
      4186 8646 4189 8662

$$

Marsili

The office that day

Everything else NWS Northern Indiana issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 12:22 AM EDT	Areal Flood Advisory	IWX	Berrien	3 hr
Aug 10, 12:54 AM EDT	Special Weather Statement	IWX	Berrien	36 min
Aug 10, 1:13 AM EDT	Special Weather Statement	IWX	Cass	32 min
Aug 10, 1:18 AM EDT	Severe Thunderstorm Warning	IWX	Cass	27 min
Aug 10, 2:43 AM EDT	Areal Flood Advisory	IWX	Berrien, Cass, Saint Joseph	3 hr
Aug 10, 6:31 AM EDT	Areal Flood Warning	IWX	Berrien	7 hr
Aug 10, 3:27 PM EDT	Heat Advisory	IWX	Branch, Cass, Hillsdale, Saint Joseph	29 hr

Nearby

Flash Flood Warnings in Michigan, 2021 Every flash 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.