Alert archive / Illinois / Flash Flood Warnings in 2012
Flash Flood Warning 15, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Apr 29, 2012, 7:54 AM CDT for Macoupin County, Montgomery County, Illinois. It was in force for 6 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
- Apr 29, 2012, 7:54 AM CDT (12:54 UTC)
- Expired
- Apr 29, 2012, 2:00 PM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Macoupin County, IL, Montgomery County, IL
The radar
The Lincoln radar (KILX), 97 km from the middle of the area, began a volume at 12:56 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 29, 9:24 AM CDT | HEAVY RAIN 2.03 | 4 Nw Nokomis, IL | 24 HOUR TOTAL...WITH 1.16 OCCURRING IN THE PAST 90 MINUTES |
| Apr 29, 9:40 AM CDT | HEAVY RAIN 2.25 | Nokomis, 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 12:00Z, 0.9 hours before the alert went out and 122 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.
- Mixed-layer CAPE
- 1 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 414 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 135 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
219
WGUS53 KLSX 291254
FFWLSX
ILC117-135-291900-
/O.NEW.KLSX.FF.W.0015.120429T1254Z-120429T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
754 AM CDT SUN APR 29 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL MACOUPIN COUNTY IN SOUTHWEST ILLINOIS...
MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...
* UNTIL 200 PM CDT SUNDAY
* AT 753 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
WARNED AREA. RADAR AND SPOTTER REPORTS INDICATE TWO TO THREE
INCHES OF RAINFALL HAVE FALLEN THIS MORNING.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
CARLINVILLE...GILLESPIE...HILLSBORO...LITCHFIELD...NOKOMIS...
PALMYRA...RAYMOND...SHIPMAN...TAYLOR SPRINGS AND WITT.
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.
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 3922 8925 3911 8927 3911 9015 3944 9015
3944 8953 3936 8952 3935 8922 3933 8915
3922 8913
$$
TILLY1 follow-up statement
723
WGUS73 KLSX 291853
FFSLSX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
153 PM CDT SUN APR 29 2012
ILC117-135-291909-
/O.EXP.KLSX.FF.W.0015.000000T0000Z-120429T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MACOUPIN IL-MONTGOMERY IL-
153 PM CDT SUN APR 29 2012
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR MONTGOMERY AND
CENTRAL MACOUPIN COUNTIES WILL BE ALLOWED TO EXPIRE AT 200 PM CDT...
EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.
LAT...LON 3922 8925 3911 8927 3911 9015 3944 9015
3944 8953 3936 8952 3935 8922 3933 8915
3922 8913
$$
BYRDThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 7:41 PM CDT | Areal Flood Advisory | LSX | Clinton, Saint Clair, Washington | 6 hr |
| Apr 28, 8:12 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 48 min |
| Apr 28, 8:39 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 36 min |
| Apr 28, 9:05 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Randolph, Saint Clair | 33 min |
| Apr 28, 9:31 PM CDT | Severe Thunderstorm Warning | LSX | Randolph, Saint Clair, Washington | 33 min |
| Apr 28, 10:01 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Macoupin, Madison, Montgomery | 34 min |
| Apr 28, 10:25 PM CDT | Severe Thunderstorm Warning | LSX | Macoupin, Montgomery | 28 min |
| Apr 29, 1:44 AM CDT | Severe Thunderstorm Warning | LSX | Madison | 46 min |
| Apr 29, 4:59 AM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 46 min |
| Apr 29, 5:32 AM CDT | Severe Thunderstorm Warning | LSX | Greene, Jersey | 36 min |
| Apr 29, 7:58 AM CDT | Severe Thunderstorm Warning | LSX | Montgomery | 20 min |
| Apr 29, 4:00 PM CDT | Flash Flood Watch | LSX | Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more | 15 hr |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.