Alert archive / Indiana / Flash Flood Warnings in 2021

Flash Flood Warning 1, NWS Northern Indiana

July 12, 2021Saint Joseph County, Indiana

NWS Northern Indiana issued this flash flood warning at Jul 12, 2021, 6:39 PM EDT for Saint Joseph County, Indiana. It was in force for 3 hr. 14 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
Jul 12, 2021, 6:39 PM EDT (22:39 UTC)
Expired
Jul 12, 2021, 9:45 PM EDT
In force
3 hr
Issued by
NWS Northern Indiana
Area
Storm-based polygon
Flood severity
None

County Saint Joseph County, IN

The radar

The Northern Indiana radar (KIWX), 60 km from the middle of the area, began a volume at 22:41 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

TimeReportWhereRemark
Jul 12, 6:49 PM EDTFLASH FLOOD2 Ese South Bend, INMANHOLE COVER HAS BEEN FORCED OFF BY WATER. VIA TWITTER.
Jul 12, 6:52 PM EDTFLASH FLOOD2 Nnw Mishawaka, INMANHOLE COVER HAS BEEN FORCED OFF BY WATER. VIA TWITTER.
Jul 12, 6:56 PM EDTFLASH FLOOD2 Nw Mishawaka, INHICKORY RD IS FLOODED BETWEEN CORBY AND MCKINLEY. VIA TWITTER.
Jul 12, 7:00 PM EDTFLASH FLOOD2 Nw Mishawaka, INWATER RESCUE FOR 3 VEHICLES IN FLOODED ROADWAY. ROAD IS NOW CLOSED.
Jul 12, 7:04 PM EDTFLASH FLOOD2 Sw Granger, INWATER IN PARKING LOT IS SEVERAL INCHES DEEP.
Jul 12, 7:20 PM EDTFLASH FLOOD2 W Mishawaka, INSTREETS ARE FLOODED. VIA TWITTER.
Jul 12, 7:23 PM EDTFLASH FLOOD2 Sw Mishawaka, INSTREET IS FLOODED. VIA TWITTER.
Jul 12, 7:24 PM EDTFLASH FLOOD3 Nne Gulivoire Park, INSTREET IS FLOODED. MANHOLE COVERS ARE FORCED OFF AND FLOWING. VIA TWITTER.
Jul 12, 7:25 PM EDTFLASH FLOODGulivoire Park, INROAD IS IMPASSABLE DUE TO HIGH WATER.
Jul 12, 7:30 PM EDTHEAVY RAIN 4.113 Ene Gulivoire Park, IN4.11 IN OVER 1 HOUR. 1 TO 2 INCHES DEEP WATER FLOWING DOWN THE STREET.
Jul 12, 7:35 PM EDTFLASH FLOOD2 W Mishawaka, INSTREET FLOODING SEVERAL INCHES DEEP, UP TO THE CAR DOORS. VIA TWITTER.
Jul 12, 7:39 PM EDTFLASH FLOOD1 Wnw Mishawaka, INVEHICLE IN FLOOD WATER. OCCUPANT IS ON THE ROOF OF THE VEHICLE.
Jul 12, 7:48 PM EDTFLASH FLOOD2 Nne Gulivoire Park, INWATER IS MOVING RAPIDLY ACROSS THE STREETS. ONE STRANDED VEHICLE NOTED IN THE AREA.
Jul 12, 8:30 PM EDTHEAVY RAIN 4.332 W Mishawaka, INPHOTO ON TWITTER OF RAIN GAUGE.

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 12:00Z, 10.7 hours before the alert went out and 253 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2021-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 653 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2021-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

292 
WGUS53 KIWX 122239
FFWIWX
INC141-130145-
/O.NEW.KIWX.FF.W.0001.210712T2239Z-210713T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Northern Indiana has issued a

* Flash Flood Warning for...
  St. Joseph County in north central Indiana...

* Until 945 PM EDT.

* At 637 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. The expected rainfall rate is 1 to 2 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...
  South Bend, Mishawaka, Georgetown, Gulivoire Park, Granger, 
  Osceola, North Liberty, New Carlisle, Lakeville, Roseland, Indian 
  Village, Lydick, Chain-o-lakes, Crumstown, Woodland and Wyatt.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4176 8651 4175 8606 4173 8606 4172 8606
      4171 8606 4154 8613 4148 8623 4148 8625
      4151 8644 4157 8648 4161 8649 4163 8649
      4164 8649 4165 8649

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

$$

PBM
2 follow-up statements
368 
WGUS73 KIWX 122344
FFSIWX

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

INC141-130145-
/O.CON.KIWX.FF.W.0001.000000T0000Z-210713T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Joseph IN-
744 PM EDT Mon Jul 12 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM EDT THIS 
EVENING FOR CENTRAL ST. JOSEPH COUNTY...

At 743 PM EDT, Local law enforcement reported thunderstorms 
producing heavy rain across the warned area. Extensive street 
flooding and water rescues have been reported. Between 2 and 3 
inches of rain have fallen. The expected rainfall rate is 1 to 2 
inches in 1 hour. Additional rainfall amounts of 1 to 2 inches are 
possible in the warned area. Flash flooding is ongoing.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement reported.

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...
  South Bend, Mishawaka, Georgetown, Gulivoire Park, Granger, 
  Osceola, Lakeville, Roseland, Indian Village, Woodland and Wyatt.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4175 8635 4175 8606 4173 8606 4172 8606
      4171 8606 4154 8613 4148 8623 4148 8625
      4151 8634 4155 8637 4160 8638 4162 8638
      4164 8637 4168 8637

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

PBM
749 
WGUS73 KIWX 130143
FFSIWX

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

INC141-130153-
/O.EXP.KIWX.FF.W.0001.000000T0000Z-210713T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Joseph IN-
943 PM EDT Mon Jul 12 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 945 PM EDT THIS EVENING FOR 
CENTRAL ST. JOSEPH COUNTY...

The heavy rain has ended. Ongoing flooding persists. Do not drive 
through flooded roads. Please continue to heed remaining road 
closures.

LAT...LON 4175 8635 4175 8606 4173 8606 4172 8606
      4171 8606 4154 8613 4148 8623 4148 8625
      4151 8634 4155 8637 4160 8638 4162 8638
      4164 8637 4168 8637

$$

PBM

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 3:34 PM EDTSpecial Weather StatementIWXCass41 min
Jul 12, 3:58 PM EDTSpecial Weather StatementIWXNoble47 min
Jul 12, 4:17 PM EDTSpecial Weather StatementIWXLaGrange28 min
Jul 12, 4:27 PM EDTSpecial Weather StatementIWXCass33 min
Jul 12, 4:36 PM EDTSpecial Weather StatementIWXDeKalb, Steuben39 min
Jul 12, 4:51 PM EDTSpecial Weather StatementIWXWhitley39 min
Jul 12, 5:03 PM EDTAreal Flood AdvisoryIWXDeKalb, LaGrange, Noble, Steuben5 hr
Jul 12, 5:08 PM EDTAreal Flood AdvisoryIWXCass3 hr
Jul 12, 5:30 PM EDTSpecial Weather StatementIWXSteuben30 min
Jul 12, 5:44 PM EDTAreal Flood AdvisoryIWXLaPorte, Marshall, Saint Joseph4 hr
Jul 12, 6:01 PM EDTSpecial Weather StatementIWXSaint Joseph29 min
Jul 12, 6:42 PM EDTAreal Flood AdvisoryIWXSteuben2 hr
Jul 12, 7:08 PM EDTSpecial Weather StatementIWXKosciusko37 min
Jul 12, 7:11 PM EDTFlash Flood WarningIWXCass98 min

Nearby

Flash Flood Warnings in Indiana, 2021Every 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.