Alert archive / Indiana / Flash Flood Warnings in 2012

Flash Flood Warning 1, NWS Indianapolis, IN

April 28, 2012Knox County, Sullivan County, Indiana

NWS Indianapolis, IN issued this flash flood warning at Apr 28, 2012, 5:39 PM EDT for Knox County, Sullivan County, Indiana. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 28, 2012, 5:39 PM EDT (21:39 UTC)
Expired: Apr 28, 2012, 8:30 PM EDT
In force: 3 hr
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon
Flood severity: None

Counties Knox County, IN, Sullivan County, IN

The radar

The Evansville,IN radar (KVWX), 82 km from the middle of the area, began a volume at 21:40 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, 9.7 hours before the alert went out and 165 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1019 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 681 m²/s²
0-3 km storm-relative helicity: 811 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

671 
WGUS53 KIND 282139
FFWIND
INC083-153-290030-
/O.NEW.KIND.FF.W.0001.120428T2139Z-120429T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
539 PM EDT SAT APR 28 2012

THE NATIONAL WEATHER SERVICE IN INDIANAPOLIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL KNOX COUNTY IN SOUTHWEST INDIANA...
  SOUTHERN SULLIVAN COUNTY IN SOUTHWEST INDIANA...

* UNTIL 830 PM EDT

* AT 537 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.     
  DOPPLER RADAR ESTIMATES RAINFALL RATES IN EXCESS OF TWO INCHES
  IS OCCURRING ACROSS PARTS OF THE WARNED AREA.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  SULLIVAN.

LAW ENFORCEMENT REPORTED PONDING OF WATER ON ROADS IN THE TOWN OF 
SULLIVAN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 3910 8761 3911 8724 3891 8724 3891 8722
      3887 8725 3884 8728 3883 8752 3889 8754
      3892 8752 3896 8752 3897 8753 3898 8757
      3906 8758

$$

JAS

2 follow-up statements

620 
WGUS73 KIND 282255
FFSIND

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
655 PM EDT SAT APR 28 2012

INC083-153-290030-
/O.CON.KIND.FF.W.0001.000000T0000Z-120429T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KNOX-SULLIVAN-
655 PM EDT SAT APR 28 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTH CENTRAL KNOX AND
SOUTHERN SULLIVAN COUNTIES UNTIL 830 PM EDT...

AT 648 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE 
THUNDERSTORMS WITH THE HEAVY RAINFALL THAT PROMPTED THE WARNING HAVE 
MOVED OUT OF THE WARNED AREA. UP TO TWO INCHES OF RAIN HAS FALLEN 
OVER PARTS OF SOUTHERN SULLIVAN AND EXTREME NORTHERN KNOX COUNTY.  
LIGHTER RAINFALL IS EXPECTED TO CONTINUE ACROSS THE AREA FOR THE REST 
OF THE EVENING...WITH ADDITIONAL AMOUNTS GENERALLY LESS THAN 
A QUARTER INCH.

ALTHOUGH THE HEAVIER RAINFALL HAS ENDED...RESIDUAL FLOODING MAY BE 
ON GOING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 3910 8761 3911 8724 3891 8724 3891 8722
      3887 8725 3884 8728 3883 8752 3889 8754
      3892 8752 3896 8752 3897 8753 3898 8757
      3906 8758

$$

JAS

868 
WGUS73 KIND 290025
FFSIND

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
825 PM EDT SAT APR 28 2012

INC083-153-290036-
/O.EXP.KIND.FF.W.0001.000000T0000Z-120429T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KNOX-SULLIVAN-
825 PM EDT SAT APR 28 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTH CENTRAL KNOX
AND SOUTHERN SULLIVAN COUNTIES WILL BE ALLOWED TO EXPIRE AT 830 PM
EDT...

THE THREAT FOR ADDITIONAL HEAVY RAIN HAS ENDED...ALTHOUGH POCKETS OF 
LIGHT TO MODERATE RAIN MAY CONTINUE THROUGHOUT THE EVENING. 

RESIDUAL FLOODING IN LOW LYING AREAS IS STILL POSSIBLE. BE ALERT 
THIS EVENING...ESPECIALLY IN LOW LYING OR FLOOD PRONE AREAS.

LAT...LON 3910 8761 3911 8724 3891 8724 3891 8722
      3887 8725 3884 8728 3883 8752 3889 8754
      3892 8752 3896 8752 3897 8753 3898 8757
      3906 8758

$$

JAS

The office that day

Everything else NWS Indianapolis, IN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 28, 5:26 PM EDT	Severe Thunderstorm Warning	IND	Daviess, Greene, Knox, Sullivan	49 min
Apr 28, 5:59 PM EDT	Tornado Warning	IND	Daviess, Knox, Martin	31 min
Apr 28, 6:28 PM EDT	Tornado Warning	IND	Daviess, Lawrence, Martin	19 min

Nearby

Flash Flood Warnings in Indiana, 2012 Every flash flood warning in 2012

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.