Alert archive / Indiana / Areal Flood Advisories in 2021

Areal Flood Advisory 21, NWS Northern Indiana

July 12, 2021Cass County, Indiana

NWS Northern Indiana issued this areal flood advisory at Jul 12, 2021, 5:08 PM EDT for Cass County, Indiana. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 12, 2021, 5:08 PM EDT (21:08 UTC)
Expired: Jul 12, 2021, 8:15 PM EDT
In force: 3 hr
Issued by: NWS Northern Indiana
Area: Storm-based polygon

County Cass County, IN

The radar

The Northern Indiana radar (KIWX), 93 km from the middle of the area, began a volume at 21:09 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, 9.1 hours before the alert went out and 195 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.

873 
WGUS83 KIWX 122108
FLSIWX

Flood Advisory
National Weather Service Northern Indiana
508 PM EDT Mon Jul 12 2021

INC017-130015-
/O.NEW.KIWX.FA.Y.0021.210712T2108Z-210713T0015Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cass IN-
508 PM EDT Mon Jul 12 2021

The National Weather Service in Northern Indiana has issued a

* Urban and Small Stream Flood Advisory for...
  Central Cass County in north central Indiana...

* Until 815 PM EDT.

* At 508 PM EDT, Doppler radar indicated heavy rain due to 
  thunderstorms. This will cause urban and small stream flooding. 
  Between 1 and 3 inches of rain have fallen.

* Some locations that will experience flooding include...
  Logansport, Walton, Clymers, Anoka, Adamsboro, Deacon and Lake 
  Cicott.

Additional rainfall amounts of 0.5 to 1.5 inches are expected over 
the area. This additional rain will result in minor flooding.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4083 8651 4086 8638 4081 8626 4068 8621
      4062 8627 4064 8637 4066 8637 4068 8637
      4069 8637 4069 8640 4069 8641 4069 8645
      4069 8653 4072 8653 4074 8653 4074 8658
      4076 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, 5:30 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
Jul 12, 7:11 PM EDT	Flash Flood Warning	IWX	Cass	98 min

Nearby

Areal Flood Advisories in Indiana, 2021 Every areal flood advisory 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.