Alert archive / Illinois / Flash Flood Warnings in 2016

Flash Flood Warning 16, NWS St. Louis, MO

July 24, 2016Greene County, Macoupin County, Illinois

NWS St. Louis, MO issued this flash flood warning at Jul 24, 2016, 11:28 PM CDT for Greene County, Macoupin County, Illinois. It was in force for 7 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
Jul 24, 2016, 11:28 PM CDT (04:28 UTC)
Expired
Jul 25, 2016, 6:30 AM CDT
In force
7 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

Counties Greene County, IL, Macoupin County, IL

The radar

The St Louis radar (KLSX), 99 km from the middle of the area, began a volume at 04:29 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 00:00Z, 4.5 hours before the alert went out and 145 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 2016-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4298 joules per kilogram.LCLEL10008507005003002001001 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 2016-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 square meters per square second.1939Sfc1 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
4298 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
1138 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

256 
WGUS53 KLSX 250428
FFWLSX
ILC061-117-251130-
/O.NEW.KLSX.FF.W.0016.160725T0428Z-160725T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1128 PM CDT SUN JUL 24 2016

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN GREENE COUNTY IN SOUTHWESTERN ILLINOIS...
  NORTHERN MACOUPIN COUNTY IN SOUTHWESTERN ILLINOIS...

* UNTIL 630 AM CDT MONDAY

* AT 1128 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO THREE INCHES OF RAIN HAVE
  ALREADY FALLEN SINCE 10 PM. FLASH FLOODING IS EXPECTED TO BEGIN
  SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  VIRDEN...CARROLLTON...GIRARD...GREENFIELD...PALMYRA...
  ATHENSVILLE...WRIGHTS...NILWOOD...MODESTO...HETTICK...
  ROCKBRIDGE AND SCOTTVILLE.

ADDITIONAL RAINFALL AMOUNTS OF TWO INCHES ARE POSSIBLE IN THE WARNED
AREA.

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...EAST FORK OTTER
CREEK...LITTLE BEAR CREEK...MILLER BRANCH...STEER CREEK...MACOUPIN
CREEK...LITTLE BEAR ROUGH...BEAR CREEK...LEFT FORK APPLE CREEK...
COATES CREEK...RICHARDSON BRANCH...LINK BRANCH...PRAIRIE BRANCH...
LONG BRANCH...NEGRO LICK...HICKS CREEK...SHEARLES BRANCH...JOES
CREEK...SUGAR CREEK...SAND BRANCH...HODGES CREEK...RUBICON CREEK...
HURRICANE CREEK...SAND CREEK...APPLE CREEK...SOLOMON CREEK...LICK
CREEK...WHITAKER CREEK...WEST BRANCH HORSE CREEK...PANTHER CREEK AND
TAYLOR CREEK.

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.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.

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

&&

LAT...LON 3952 8970 3943 8970 3920 9039 3932 9040
      3952 9014

$$

TES
1 follow-up statement
583 
WGUS73 KLSX 251126
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
626 AM CDT MON JUL 25 2016

ILC061-117-251136-
/O.EXP.KLSX.FF.W.0016.000000T0000Z-160725T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GREENE IL-MACOUPIN IL-
626 AM CDT MON JUL 25 2016

...THE FLASH FLOOD WARNING FOR EASTERN GREENE AND NORTHERN MACOUPIN
COUNTIES WILL EXPIRE AT 630 AM CDT...

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 3952 8970 3943 8970 3920 9039 3932 9040
      3952 9014

$$

GKS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 2:27 AM CDTSpecial Weather StatementLSXCalhoun48 min
Jul 25, 2:51 AM CDTAreal Flood AdvisoryLSXMonroe, Saint Clair6 hr
Jul 25, 3:27 AM CDTSpecial Weather StatementLSXJersey, Macoupin, Madison, Montgomery48 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.