Alert archive / Missouri / Flash Flood Warnings in 2011

Flash Flood Warning 6, NWS St. Louis, MO

April 22, 2011Adams County, Brown County, Pike County, Illinois; 4 counties in Missouri

NWS St. Louis, MO issued this flash flood warning at Apr 22, 2011, 9:36 AM CDT for Adams County, Brown County, Pike County, Illinois; 4 counties in Missouri. It was in force for 3 hr. 1 report 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 22, 2011, 9:36 AM CDT (14:36 UTC)
Expired: Apr 22, 2011, 12:40 PM CDT
In force: 3 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Adams County, IL, Brown County, IL, Pike County, IL, Marion County, MO, Monroe County, MO, Ralls County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 139 km from the middle of the area, began a volume at 14:38 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 22, 12:44 PM CDT	HEAVY RAIN 2.25	2 E Versailles, IL	2.25 INCHES OF RAINFALL SINCE 0730 AM.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 2.6 hours before the alert went out and 196 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 527 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 351 m²/s²
0-3 km storm-relative helicity: 434 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.

529 
WGUS53 KLSX 221436
FFWLSX
ILC001-009-149-MOC127-137-173-205-221830-
/O.NEW.KLSX.FF.W.0006.110422T1436Z-110422T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
936 AM CDT FRI APR 22 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BROWN COUNTY IN WEST CENTRAL ILLINOIS...
  MARION COUNTY IN NORTHEAST MISSOURI...
  NORTHEASTERN MONROE COUNTY IN NORTHEAST MISSOURI...
  NORTHERN PIKE COUNTY IN WEST CENTRAL ILLINOIS...
  NORTHERN RALLS COUNTY IN NORTHEAST MISSOURI...
  SOUTHEASTERN SHELBY COUNTY IN NORTHEAST MISSOURI...
  SOUTHERN ADAMS COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 130 PM CDT

* AT 935 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
  WARNED AREA.  RAINS OF ONE TO TWO INCHES HAVE OCCURRED SINCE 
  730 AM...AND ADDITIONAL RAINFALS OF UP TO AN INCH ARE POSSIBLE
  BY LATE MORNING. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  HANNIBAL...MONROE CITY...PALMYRA...QUINCY...BARRY...BEVERLY...
  BUCKHORN...EMDEN...FALL CREEK...MOUNT STERLING...PAYSON...
  PHILADELPHIA...RENSSELAER AND WARREN.

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 4003 9061 3999 9060 3999 9055 3981 9058
      3980 9060 3974 9063 3957 9211 3992 9186
      3995 9161 3994 9145 3996 9146 3997 9146
      4005 9068

$$

TRUETT

1 follow-up statement

922 
WGUS73 KLSX 221740
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1240 PM CDT FRI APR 22 2011

ILC001-009-149-MOC127-137-173-205-221753-
/O.CAN.KLSX.FF.W.0006.000000T0000Z-110422T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIKE IL-BROWN IL-ADAMS IL-MONROE MO-RALLS MO-MARION MO-SHELBY MO-
1240 PM CDT FRI APR 22 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHERN ADAMS...
BROWN AND NORTHERN PIKE COUNTIES IN WEST CENTRAL ILLINOIS...AND
SOUTHEASTERN SHELBY...MARION...NORTHERN RALLS AND NORTHEASTERN MONROE
COUNTIES IN NORTHEAST MISSOURI IS CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN ENDED OVER THE WARNED AREA DURING THE 
MORNING.  STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE 
BEGINNING TO RECEDE...AND LAW ENFORCEMENT THROUGHOUT THE AREA HAVE 
NOT RECEIVED ANY REPORTS OF FLOODING OR CLOSED ROADS.

HOWEVER...ANOTHER ROUND OF THUNDERSTORMS IS EXPECTED ACROSS 
NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS LATE THIS AFTERNOON AND 
EARLY THIS EVENING...AND THESE STORMS COULD POSE ANOTHER DANGER OF 
FLASH FLOODING.  PEOPLE THROUGHOUT THE AREA ARE URGED TO MONITOR 
WEATHER DEVELOPMENTS INTO THE EARLY EVENING HOURS.

LAT...LON 4003 9061 3999 9060 3999 9055 3981 9058
      3980 9060 3974 9063 3957 9211 3992 9186
      3995 9161 3994 9145 3996 9146 3997 9146
      4005 9068

$$

TRUETT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 7:12 AM CDT	Areal Flood Advisory	LSX	Randolph	3 hr
Apr 22, 7:17 AM CDT	Areal Flood Advisory	LSX	Monroe	3 hr
Apr 22, 7:28 AM CDT	Flash Flood Warning	LSX	Monroe, Randolph, Saint Clair, Washington	6 hr
Apr 22, 8:51 AM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	39 min
Apr 22, 9:16 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey, Pike	44 min
Apr 22, 9:59 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey, Macoupin, Madison, Montgomery and 1 more	46 min
Apr 22, 10:17 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun	43 min
Apr 22, 10:56 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Macoupin, Madison, Montgomery and 1 more	49 min
Apr 22, 11:00 AM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	45 min
Apr 22, 11:41 AM CDT	Areal Flood Advisory	LSX	Bond, Fayette, Macoupin, Madison, Montgomery	3 hr
Apr 22, 11:44 AM CDT	Severe Thunderstorm Warning	LSX	Clinton, Madison, Monroe, Saint Clair, Washington	46 min
Apr 22, 12:21 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette	39 min
Apr 22, 1:33 PM CDT	River Flood Warning	LSX	Brown	22 hr
Apr 22, 6:55 PM CDT	Tornado Warning	LSX	Calhoun	50 min
Apr 22, 6:58 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Madison	47 min
Apr 21, 9:24 PM CDT	River Flood Warning	LSX	Gasconade, Montgomery	11 days
Apr 21, 10:14 PM CDT	River Flood Warning	LSX	Reynolds	9 days
Apr 22, 8:47 AM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Moniteau, Osage	43 min
Apr 22, 9:28 AM CDT	Severe Thunderstorm Warning	LSX	Callaway, Lincoln, Montgomery, Pike, Warren	47 min
Apr 22, 9:32 AM CDT	Severe Thunderstorm Warning	LSX	Callaway, Cole, Franklin, Gasconade, Lincoln, Montgomery and 2 more	43 min
Apr 22, 12:34 PM CDT	River Flood Warning	LSX	Saint Charles	26 hr
Apr 22, 2:39 PM CDT	River Flood Warning	LSX	Marion	37 hr
Apr 22, 4:32 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	43 min
Apr 22, 4:40 PM CDT	Tornado Warning	LSX	Cole, Moniteau	50 min
Apr 22, 5:10 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade	39 min
Apr 22, 5:12 PM CDT	Tornado Warning	LSX	Boone, Callaway, Cole	48 min
Apr 22, 5:49 PM CDT	Tornado Warning	LSX	Callaway, Gasconade, Montgomery, Osage	41 min
Apr 22, 6:05 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Osage	40 min
Apr 22, 6:22 PM CDT	Tornado Warning	LSX	Franklin, Gasconade, Lincoln, Montgomery, Warren	38 min
Apr 22, 6:36 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Osage	39 min

Nearby

Flash Flood Warnings in Missouri, 2011 Flash Flood Warnings in Illinois, 2011 Every flash flood warning in 2011

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.