Alert archive / Indiana / Flash Flood Warnings in 2021

Flash Flood Warning 2, NWS Northern Indiana

July 12, 2021Cass County, Indiana

NWS Northern Indiana issued this flash flood warning at Jul 12, 2021, 7:11 PM EDT for Cass County, Indiana. It was in force for 98 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 12, 2021, 7:11 PM EDT (23:11 UTC)
Expired: Jul 12, 2021, 8:49 PM EDT
In force: 98 min
Issued by: NWS Northern Indiana
Area: Storm-based polygon
Flood severity: None

County Cass County, IN

The radar

The Northern Indiana radar (KIWX), 93 km from the middle of the area, began a volume at 23:12 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

Lincoln, IL (KILX), launched 12:00Z, 11.2 hours before the alert went out and 194 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: 653 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 548 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

130 
WGUS53 KIWX 122311
FFWIWX
INC017-130215-
/O.NEW.KIWX.FF.W.0002.210712T2311Z-210713T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Northern Indiana
711 PM EDT Mon Jul 12 2021

The National Weather Service in Northern Indiana has issued a

* Flash Flood Warning for...
  Central Cass County in north central Indiana...

* Until 1015 PM EDT.

* At 710 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 3 inches of 
  rain have fallen. The expected rainfall rate is 1 to 1.5 inches in 
  1 hour. 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...
  Logansport, Clymers, Anoka, Lake Cicott and Adamsboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4075 8658 4084 8651 4086 8636 4080 8625
      4072 8622 4067 8633 4066 8637 4068 8637
      4069 8637 4069 8640 4069 8641 4069 8645
      4069 8653 4072 8653 4074 8653 4074 8658

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-1.5 INCHES IN 1 HOUR

$$

PBM

1 follow-up statement

532 
WGUS73 KIWX 130049
FFSIWX

Flash Flood Statement
National Weather Service Northern Indiana
849 PM EDT Mon Jul 12 2021

INC017-130059-
/O.CAN.KIWX.FF.W.0002.000000T0000Z-210713T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cass IN-
849 PM EDT Mon Jul 12 2021

...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL CASS COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 4075 8658 4084 8651 4086 8636 4080 8625
      4072 8622 4067 8633 4066 8637 4068 8637
      4069 8637 4069 8640 4069 8641 4069 8645
      4069 8653 4072 8653 4074 8653 4074 8658

$$

PBM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 3:34 PM EDT	Special Weather Statement	IWX	Cass	41 min
Jul 12, 3:58 PM EDT	Special Weather Statement	IWX	Noble	47 min
Jul 12, 4:17 PM EDT	Special Weather Statement	IWX	LaGrange	28 min
Jul 12, 4:27 PM EDT	Special Weather Statement	IWX	Cass	33 min
Jul 12, 4:36 PM EDT	Special Weather Statement	IWX	DeKalb, Steuben	39 min
Jul 12, 4:51 PM EDT	Special Weather Statement	IWX	Whitley	39 min
Jul 12, 5:03 PM EDT	Areal Flood Advisory	IWX	DeKalb, LaGrange, Noble, Steuben	5 hr
Jul 12, 5:08 PM EDT	Areal Flood Advisory	IWX	Cass	3 hr
Jul 12, 5:30 PM EDT	Special Weather Statement	IWX	Steuben	30 min
Jul 12, 5:44 PM EDT	Areal Flood Advisory	IWX	LaPorte, Marshall, Saint Joseph	4 hr
Jul 12, 6:01 PM EDT	Special Weather Statement	IWX	Saint Joseph	29 min
Jul 12, 6:39 PM EDT	Flash Flood Warning	IWX	Saint Joseph	3 hr
Jul 12, 6:42 PM EDT	Areal Flood Advisory	IWX	Steuben	2 hr
Jul 12, 7:08 PM EDT	Special Weather Statement	IWX	Kosciusko	37 min

Nearby

Flash Flood Warnings in Indiana, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.