Alert archive / Illinois / Flash Flood Warnings in 2016

Flash Flood Warning 52, NWS St. Louis, MO

October 19, 2016Monroe County, Illinois

NWS St. Louis, MO issued this flash flood warning at Oct 19, 2016, 11:39 PM CDT for Monroe County, Illinois. It was in force for 8 hr. 2 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
Oct 19, 2016, 11:39 PM CDT (04:39 UTC)
Expired
Oct 20, 2016, 7:45 AM CDT
In force
8 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

County Monroe County, IL

The radar

The St Louis radar (KLSX), 70 km from the middle of the area, began a volume at 04:41 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
Oct 20, 12:45 AM CDTFLASH FLOODValmeyer, ILMONROE CITY CREEK FLOODED CLOSING NEARBY ROADS. BLUFF ROAD WAS ALSO CLOSED AT SEVERAL POINTS.
Oct 20, 6:01 AM CDTHEAVY RAIN 3.75Waterloo, IL

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, 4.7 hours before the alert went out and 245 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 00:00Z on 2016-10-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2016-10-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -54 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1570 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
-54 m²/s²
0-3 km storm-relative helicity
331 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

The text

As transmitted.

431 
WGUS53 KLSX 200439
FFWLSX
ILC133-201245-
/O.NEW.KLSX.FF.W.0052.161020T0439Z-161020T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1139 PM CDT WED OCT 19 2016

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MONROE COUNTY IN SOUTHWESTERN ILLINOIS...

* UNTIL 745 AM CDT THURSDAY.

* AT 1138 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA.  3 TO 4 INCHES OF RAINFALL HAVE
  FALLEN IN BETWEEN A 2 AND 3 HOUR PERIOD.  FLASH FLOODING IS
  EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  WATERLOO...RED BUD...VALMEYER...FOUNTAIN...NEW DESIGN...HECKER...
  MAEYSTOWN...HARRISONVILLE...WARTBURG...BURKSVILLE...
  CHALFIN BRIDGE...MADONNAVILLE...FOSTER POND AND MONROE CITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO CROSS FLOODED
ROADS. FIND AN ALTERNATE ROUTE.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 3822 8990 3822 9003 3821 9004 3819 9034
      3826 9037 3834 9037 3835 9036 3839 9012
      3832 9004 3831 9004 3831 8997 3827 8992
      3825 8992

$$

TES
1 follow-up statement
406 
WGUS73 KLSX 201230
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
730 AM CDT THU OCT 20 2016

ILC133-201238-
/O.CAN.KLSX.FF.W.0052.000000T0000Z-161020T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MONROE IL-
730 AM CDT THU OCT 20 2016

...THE FLASH FLOOD WARNING FOR CENTRAL MONROE COUNTY IS CANCELLED...

THE HEAVY RAIN HAS ENDED. FLOOD WATERS HAVE RECEDED. FLOODING IS NO
LONGER EXPECTED TO POSE A THREAT. PLEASE CONTINUE TO HEED ANY
REMAINING ROAD CLOSURES.

LAT...LON 3822 8990 3822 9003 3821 9004 3819 9034
      3826 9037 3834 9037 3835 9036 3839 9012
      3832 9004 3831 9004 3831 8997 3827 8992
      3825 8992

$$

GKS

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 19, 7:49 PM CDTSevere Thunderstorm WarningLSXFayette41 min
Oct 19, 11:20 PM CDTAreal Flood AdvisoryLSXMonroe, Saint Clair4 hr
Oct 20, 12:22 AM CDTSpecial Weather StatementLSXMacoupin38 min
Oct 20, 12:26 AM CDTSpecial Weather StatementLSXMacoupin49 min
Oct 20, 4:08 AM CDTSpecial Weather StatementLSXMadison52 min
Oct 20, 2:59 PM CDTFrost AdvisoryLSXAdams, Brown, Pike17 hr

Nearby

Flash Flood Warnings in Illinois, 2016Every flash flood warning in 2016

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.