Alert archive / Illinois / Flash Flood Warnings in 2005

Flash Flood Warning 16, NWS St. Louis, MO

September 20, 2005Washington County, Illinois

NWS St. Louis, MO issued this flash flood warning at Sep 20, 2005, 12:27 AM CDT for Washington County, Illinois. It was in force for 4 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
Sep 20, 2005, 12:27 AM CDT (05:27 UTC)
Expired
Sep 20, 2005, 4:30 AM CDT
In force
4 hr
Issued by
NWS St. Louis, MO
Area
Counties, with a storm outline in the text

County Washington County, IL

The radar

The St Louis radar (KLSX), 112 km from the middle of the area, began a volume at 05:29 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

Nashville Metro, TN (KBNA), launched 00:00Z, 5.5 hours before the alert went out and 354 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, Nashville Metro, TN at 00:00Z on 2005-09-20Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 00:00Z on 2005-09-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2082 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
33 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.

000 
WGUS53 KLSX 200530
FFWLSX
ILC189-200930-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1227 AM CDT TUE SEP 20 2005

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS

* UNTIL 430 AM CDT

* AT 1224 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...AND WILL BE
  AFFECTING OKAWVILLE...NASHVILLE AND ASHLEY.

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES 2 TO 3 INCHES OF
RAIN HAS ALREADY FALLEN OVER NORTHEASTERN PORTIONS OF WASHINGTON
COUNTY...PARTICULARLY JUST SOUTH OF CENTRALIA. ADDITIONAL RAINFALL
AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE BETWEEN NOW AND 300 AM 
THIS MORNING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE 
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS 
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN ST
LOUIS.

LAT...LON 3822 8969 3823 8917 3850 8917 3851 8942
      3844 8968

$$

PEDIGO
2 follow-up statements
000 
WGUS73 KLSX 200706
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
201 AM CDT TUE SEP 20 2005

ILC189-200930-
WASHINGTON IL-
201 AM CDT TUE SEP 20 2005

...A FLASH FLOOD WARNING CONTINUES UNTIL 430 AM CDT FOR WASHINGTON
COUNTY...

AT 158 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THE HEAVY RAIN WHICH HAS BEEN OCCURRING THE PAST FEW HOURS HAS NOW 
ENDED AND THE STORMS HAVE MOVED TO THE EAST OF THE AREA.

DOPPLER RADAR PRECIPITATION ESTIMATES INDICATE 3 TO 4 INCHES OF RAIN
FELL OVER EASTERN WASHINGTON COUNTY NORTH OF INTERSTATE 64.

THOUGH THE RAINS HAVE ENDED THE RUNOFF INTO DITCHES CREEKS AND 
STREAMS WILL CONTINUE. FAVORED LOW WATER AREAS AND UNDERPASSES MAY 
CONTINUE TO FLOOD.  

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE 
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS 
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

LAT...LON 3822 8969 3824 8944 3823 8917 3850 8917
      3851 8942 3844 8968

$$

PEDIGO
000 
WGUS73 KLSX 200904
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
402 AM CDT TUE SEP 20 2005

ILC189-200912-
WASHINGTON IL-
402 AM CDT TUE SEP 20 2005

...THE FLASH FLOOD WARNING FOR WASHINGTON COUNTY IS CANCELLED...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES RAINFALL TOTALS OF
3 TO 4 INCHES FELL IN THE NORTHEAST QUARTER OF WASHINGTON COUNTY
IN TWO TO THREE HOURS.  THE STORMS HAVE MOVED OUT OF THE AREA...
HOWEVER RUNOFF FROM EARLIER PRECIPITATION WILL CONTINUE. 

EVEN THOUGH THE PRECIPITATION HAS ENDED...MAKE IT A POINT NOT TO 
DRIVE OR WALK THROUGH FLOODED AREAS OR MOVING WATER.

LAT...LON 3822 8969 3824 8944 3823 8917 3850 8917
      3851 8942 3844 8968

$$

PEDIGO

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 19, 8:23 PM CDTSevere Thunderstorm WarningLSXMadison45 min
Sep 19, 8:57 PM CDTSevere Thunderstorm WarningLSXMonroe, Saint Clair23 min
Sep 19, 9:35 PM CDTSevere Thunderstorm WarningLSXMarion10 min

Nearby

Flash Flood Warnings in Illinois, 2005Every flash flood warning in 2005

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.