Alert archive / Illinois / Flash Flood Warnings in 2012

Flash Flood Warning 10, NWS St. Louis, MO

March 16, 2012Macoupin County, Illinois

NWS St. Louis, MO issued this flash flood warning at Mar 16, 2012, 9:20 AM CDT for Macoupin County, Illinois. It was in force for 2 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
Mar 16, 2012, 9:20 AM CDT (14:20 UTC)
Expired
Mar 16, 2012, 11:37 AM CDT
In force
2 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

County Macoupin County, IL

The radar

The Lincoln radar (KILX), 84 km from the middle of the area, began a volume at 14:24 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, 2.3 hours before the alert went out and 124 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 2012-03-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 358 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2012-03-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 square meters per square second.193958Sfc1 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
358 J/kg
Mixed-layer CIN
-121 J/kg
Mixed-layer LCL
1138 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
-9 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

333 
WGUS53 KLSX 161420
FFWLSX
ILC117-161830-
/O.NEW.KLSX.FF.W.0010.120316T1420Z-120316T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
920 AM CDT FRI MAR 16 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 130 PM CDT

* AT 918 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS CONTINUING TO FORM NEAR GIRARD...PRODUCING SPOTTY 
  BUT VERY HEAVY RAINFALL. RAINFALL ESTIMATES FROM RADAR INDICATE
  THAT SOME LOCATIONS NEAR GIRARD HAVE RECEIVED 2 TO 3 INCHES OF
  RAIN SINCE 730 AM.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3952 8970 3944 8970 3941 8970 3941 8971
      3941 8985 3952 8986

$$

TRUETT
1 follow-up statement
328 
WGUS73 KLSX 161637
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1137 AM CDT FRI MAR 16 2012

ILC117-161647-
/O.CAN.KLSX.FF.W.0010.000000T0000Z-120316T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MACOUPIN IL-
1137 AM CDT FRI MAR 16 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHEASTERN
MACOUPIN COUNTY IS CANCELLED..

MOST OF THE RAIN OVER NORTHEAST MACOUPIN COUNTY TAPERED OFF BY MID 
MORNING.  AT 1115 AM...MACOUPIN COUNTY ESDA INDICATED NO FLOODING 
PROBLEMS HAD BEEN REPORTED IN NORTHEAST MACOUPIN COUNTY...AND THE 
GIRARD AREA.

LAT...LON 3952 8970 3944 8970 3941 8970 3941 8971
      3941 8985 3952 8986

$$

TRUETT

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 15, 9:51 PM CDTSevere Thunderstorm WarningLSXCalhoun39 min

Nearby

Flash Flood Warnings in Illinois, 2012Every 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.