Alert archive / Missouri / Flash Flood Watches in 2012
Flash Flood Watch 4, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood watch at May 1, 2012, 2:01 AM CDT for 11 counties in Illinois; 16 counties in Missouri. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- May 1, 2012, 2:01 AM CDT (07:01 UTC)
- Expired
- May 1, 2012, 9:25 AM CDT
- In force
- 7 hr
- Issued by
- NWS St. Louis, MO
- Flood severity
- None
All 27 counties
Bond County, IL, Calhoun County, IL, Clinton County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe County, IL, Montgomery County, IL, Saint Clair County, IL, Washington County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln County, MO, Moniteau County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 14 km from the middle of the area, began a volume at 07:03 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, 7.0 hours before the alert went out and 240 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
- 4 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 486 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- -3 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
543 WGUS63 KLSX 010701 FFALSX URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE ST LOUIS MO 201 AM CDT TUE MAY 1 2012 MOZ041-042-047>050-011300- /O.NEW.KLSX.FF.A.0004.120501T0701Z-120501T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BOONE MO-AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO- INCLUDING THE CITIES OF...COLUMBIA...MEXICO...JEFFERSON CITY 201 AM CDT TUE MAY 1 2012 ...FLASH FLOOD WATCH IN EFFECT UNTIL 8 AM CDT THIS MORNING... THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * FLASH FLOOD WATCH FOR A PORTION OF CENTRAL MISSOURI... INCLUDING THE FOLLOWING COUNTIES...AUDRAIN MO...BOONE MO... CALLAWAY MO...COLE MO...MONITEAU MO AND OSAGE MO. * UNTIL 8 AM CDT THIS MORNING * SHOWERS AND THUNDERSTORMS WITH MODERATE AND HEAVY RAIN WILL BE MOVING INTO MID MISSOURI DURING THE REMAINDER OF THE PREDAWN HOURS...AND SOME AREAS WILL RECEIVER OVER AN INCH OF RAIN BETWEEN 3 AM AND 8 AM. SINCE THE GROUND OVER MID MISSOURI IS ALREADY WATER-LOGGED FROM YESTERDAYS MORNING RAINFALL...AND SINCE MANY CREEKS AND STREAMS ARE STILL QUITE HIGH...THIS RAIN MAY LEAD TO ADDITIONAL FLOODING. * THIS EARLY MORNING RAINFALL WILL BE IMPACTING ROADS THROUGHOUT MID MISSOURI...AND ESPECIALLY THOSE IN LOW LYING AND FLOOD PRONE AREAS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE BUT NOT IMMINENT IN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD BE AWARE OF THE POSSIBILITY OF HEAVY RAINFALL AND FLASH FLOODING. CHECK YOUR PREPAREDNESS REQUIREMENTS...ESPECIALLY IF YOU LIVE IN FLOOD PRONE AREAS. STAY INFORMED...AND BE READY FOR QUICK ACTION IF FLOODING IS OBSERVED OR IF A FLASH FLOOD WARNING IS ISSUED. && $$ TRUETT
3 follow-up statements
798 WGUS63 KLSX 010856 FFALSX URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE ST LOUIS MO 356 AM CDT TUE MAY 1 2012 ILZ058>060-064-069-074-098>102-MOZ036-051-052-059>065-011700- /O.EXB.KLSX.FF.A.0004.000000T0000Z-120501T1700Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-CLINTON IL- WASHINGTON IL-CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL- MONROE IL-PIKE MO-MONTGOMERY MO-LINCOLN MO-GASCONADE MO-WARREN MO- ST. CHARLES MO-FRANKLIN MO-ST. LOUIS MO-ST. LOUIS CITY MO- JEFFERSON MO- INCLUDING THE CITIES OF...LITCHFIELD...EDWARDSVILLE... BELLEVILLE...BOWLING GREEN...ST CHARLES...UNION...ST LOUIS 356 AM CDT TUE MAY 1 2012 ...FLASH FLOOD WATCH IN EFFECT UNTIL NOON CDT TODAY... THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS EXPANDED THE * FLASH FLOOD WATCH TO INCLUDE PORTIONS OF ILLINOIS AND MISSOURI...INCLUDING THE FOLLOWING COUNTIES...IN ILLINOIS... BOND IL...CALHOUN IL...CLINTON IL...GREENE IL...JERSEY IL... MACOUPIN IL...MADISON IL...MONROE IL...MONTGOMERY IL...ST. CLAIR IL AND WASHINGTON IL. IN MISSOURI...FRANKLIN MO... GASCONADE MO...JEFFERSON MO...LINCOLN MO...MONTGOMERY MO... PIKE MO...ST. CHARLES MO...ST. LOUIS CITY MO...ST. LOUIS MO AND WARREN MO. * UNTIL NOON CDT TODAY * SHOWERS AND THUNDERSTORMS WITH MODERATE AND HEAVY RAIN WILL BE MOVING INTO EASTERN MISSOURI AND SOUTHWEST ILLINOIS DURING THE MORNING. WIDESPREAD RAINS BETWEEN ONE-HALF AND ONE INCH ARE EXPECTED...WITH SOME ISOLATED AREAS RECEIVING UP TO 2 INCHES OF RAIN. SINCE THE GROUND OVER THE REGION ALREADY WATER-LOGGED... THIS RAIN MAY LEAD TO FLOODING PROBLEMS. * THIS RAINFALL WILL BE IMPACTING ROADS THROUGHOUT THE REGION. MORNING MOTORISTS SHOULD USE CAUTION WHEN APPROACHING LOW LYING... POORLY DRAINED...OR LOW LYING AREAS. ALSO BE WATCHFUL FOR FLOODING IN CONSTRUCTION ZONES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE BUT NOT IMMINENT IN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD BE AWARE OF THE POSSIBILITY OF HEAVY RAINFALL AND FLASH FLOODING. CHECK YOUR PREPAREDNESS REQUIREMENTS...ESPECIALLY IF YOU LIVE IN FLOOD PRONE AREAS. STAY INFORMED...AND BE READY FOR QUICK ACTION IF FLOODING IS OBSERVED OR IF A FLASH FLOOD WARNING IS ISSUED. && $$ MOZ041-042-047>050-011300- /O.CON.KLSX.FF.A.0004.000000T0000Z-120501T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BOONE MO-AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO- INCLUDING THE CITIES OF...COLUMBIA...MEXICO...JEFFERSON CITY 356 AM CDT TUE MAY 1 2012 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING... THE FLASH FLOOD WATCH CONTINUES FOR * A PORTION OF CENTRAL MISSOURI...INCLUDING THE FOLLOWING COUNTIES...AUDRAIN MO...BOONE MO...CALLAWAY MO...COLE MO... MONITEAU MO AND OSAGE MO. * UNTIL 8 AM CDT THIS MORNING * SHOWERS AND THUNDERSTORMS WITH MODERATE AND HEAVY RAIN WILL BE MOVING INTO MID MISSOURI DURING THE REMAINDER OF THE PREDAWN HOURS...AND SOME AREAS WILL RECEIVER OVER AN INCH OF RAIN BY 8 AM. SINCE THE GROUND OVER MID MISSOURI IS ALREADY WATER-LOGGED FROM YESTERDAYS MORNING RAINFALL...AND SINCE MANY CREEKS AND STREAMS ARE STILL QUITE HIGH...THIS RAIN MAY LEAD TO ADDITIONAL FLOODING. * THIS EARLY MORNING RAINFALL WILL BE IMPACTING ROADS THROUGHOUT MID MISSOURI...AND ESPECIALLY THOSE IN LOW LYING AND FLOOD PRONE AREAS. MOTORISTS SHOULD ALSO BE ALERT FOR FLOODING IN CONSTRUCTION ZONES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE BUT NOT IMMINENT IN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD BE AWARE OF THE POSSIBILITY OF HEAVY RAINFALL AND FLASH FLOODING. CHECK YOUR PREPAREDNESS REQUIREMENTS...ESPECIALLY IF YOU LIVE IN FLOOD PRONE AREAS. STAY INFORMED...AND BE READY FOR QUICK ACTION IF FLOODING IS OBSERVED OR IF A FLASH FLOOD WARNING IS ISSUED. && $$ TRUETT
260 WGUS63 KLSX 011154 FFALSX FLOOD WATCH NATIONAL WEATHER SERVICE ST LOUIS MO 654 AM CDT TUE MAY 1 2012 MOZ051-059-011300- /O.CAN.KLSX.FF.A.0004.000000T0000Z-120501T1700Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MONTGOMERY MO-GASCONADE MO- 654 AM CDT TUE MAY 1 2012 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR A PORTION OF EAST CENTRAL MISSOURI HAS BEEN CANCELLED. WHILE SHOWERS AND THUNDERSTORMS ARE STILL POSSIBLE...THE THREAT OF HEAVY RAIN HAS SHIFTED INTO EXTREME EASTERN MISSOURI. $$ MOZ041-042-047>050-011300- /O.CAN.KLSX.FF.A.0004.000000T0000Z-120501T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BOONE MO-AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO- INCLUDING THE CITIES OF...COLUMBIA...MEXICO...JEFFERSON CITY 654 AM CDT TUE MAY 1 2012 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR A PORTION OF CENTRAL MISSOURI HAS BEEN CANCELLED. WHILE SHOWERS AND THUNDERSTORMS ARE STILL POSSIBLE THIS MORNING...THE THREAT OF HEAVY RAIN HAS SHIFTED INTO EXTREME EASTERN MISSOURI. $$ ILZ058>060-064-069-074-098>102-MOZ036-052-060>065-011700- /O.CON.KLSX.FF.A.0004.000000T0000Z-120501T1700Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-CLINTON IL- WASHINGTON IL-CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL- MONROE IL-PIKE MO-LINCOLN MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO- ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO- INCLUDING THE CITIES OF...LITCHFIELD...EDWARDSVILLE... BELLEVILLE...BOWLING GREEN...ST CHARLES...UNION...ST LOUIS 654 AM CDT TUE MAY 1 2012 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL NOON CDT TODAY... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF ILLINOIS AND MISSOURI...INCLUDING THE FOLLOWING COUNTIES...IN ILLINOIS...BOND IL...CALHOUN IL...CLINTON IL... GREENE IL...JERSEY IL...MACOUPIN IL...MADISON IL...MONROE IL...MONTGOMERY IL...ST. CLAIR IL AND WASHINGTON IL. IN MISSOURI...FRANKLIN MO...JEFFERSON MO...LINCOLN MO...PIKE MO...ST. CHARLES MO...ST. LOUIS CITY MO...ST. LOUIS MO AND WARREN MO. * UNTIL NOON CDT TODAY * SHOWERS AND THUNDERSTORMS WITH MODERATE AND HEAVY RAIN WILL BE MOVING INTO EASTERN MISSOURI AND SOUTHWEST ILLINOIS DURING THE MORNING. WIDESPREAD RAINS BETWEEN ONE-HALF AND ONE INCH ARE EXPECTED...WITH SOME ISOLATED AREAS RECEIVING UP TO 2 INCHES OF RAIN. SINCE THE GROUND OVER THE REGION ALREADY WATER-LOGGED...THIS RAIN MAY LEAD TO FLOODING PROBLEMS. * THIS RAINFALL WILL BE IMPACTING ROADS THROUGHOUT THE REGION. MORNING MOTORISTS SHOULD USE CAUTION WHEN APPROACHING LOW LYING... POORLY DRAINED...OR LOW LYING AREAS. ALSO BE WATCHFUL FOR FLOODING IN CONSTRUCTION ZONES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE BUT NOT IMMINENT IN THE WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD BE AWARE OF THE POSSIBILITY OF HEAVY RAINFALL AND FLASH FLOODING. CHECK YOUR PREPAREDNESS REQUIREMENTS...ESPECIALLY IF YOU LIVE IN FLOOD PRONE AREAS. STAY INFORMED...AND BE READY FOR QUICK ACTION IF FLOODING IS OBSERVED OR IF A FLASH FLOOD WARNING IS ISSUED. && $$ TRUETT
113 WGUS63 KLSX 011425 FFALSX FLOOD WATCH NATIONAL WEATHER SERVICE ST LOUIS MO 925 AM CDT TUE MAY 1 2012 ILZ058>060-064-069-074-098>102-MOZ036-052-060>065-011530- /O.CAN.KLSX.FF.A.0004.000000T0000Z-120501T1700Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-CLINTON IL- WASHINGTON IL-CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL- MONROE IL-PIKE MO-LINCOLN MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO- ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO- INCLUDING THE CITIES OF...LITCHFIELD...EDWARDSVILLE... BELLEVILLE...BOWLING GREEN...ST CHARLES...UNION...ST LOUIS 923 AM CDT TUE MAY 1 2012 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF ILLINOIS AND MISSOURI HAS BEEN CANCELLED. THE HEAVY RAIN HAS MOVED NORTHEAST AWAY FROM FORECAST AREA. SCATTERED SHOWERS AND THUNDERSTORMS ARE STILL POSSIBLE THROUGH THIS AFTERNOON. HOWEVER...HEAVY RAIN IS NOT EXPECTED WITH THESE STORMS. $$ BYRD
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 8:11 AM CDT | Areal Flood Advisory | LSX | Bond, Montgomery | 5 hr |
| May 1, 9:01 AM CDT | Areal Flood Advisory | LSX | Fayette | 4 hr |
| Apr 30, 10:26 PM CDT | Areal Flood Warning | LSX | Boone | 12 hr |
Nearby
Flash Flood Watches in Missouri, 2012Flash Flood Watches in Illinois, 2012Every flash flood watch 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.