Alert archive / Missouri / Flash Flood Watches in 2012
Flash Flood Watch 2, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood watch at Apr 13, 2012, 9:19 PM CDT for 16 counties in Missouri; 5 counties in Illinois. It was in force for 13 hr.
The area
The counties it named.
The facts
- Issued
- Apr 13, 2012, 9:19 PM CDT (02:19 UTC)
- Expired
- Apr 14, 2012, 10:00 AM CDT
- In force
- 13 hr
- Issued by
- NWS St. Louis, MO
- Flood severity
- None
All 21 counties
Calhoun County, IL, Jersey County, IL, Madison County, IL, Monroe County, IL, Saint Clair County, IL, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln County, MO, Moniteau County, MO, Montgomery County, MO, Osage County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 34 km from the middle of the area, began a volume at 02:19 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, 2.3 hours before the alert went out and 271 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 739 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 260 m²/s²
- 0-3 km storm-relative helicity
- 284 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
261 WGUS63 KLSX 140219 FFALSX URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE ST LOUIS MO 919 PM CDT FRI APR 13 2012 .SEVERAL ROUNDS OF THUNDERSTORMS WILL BE MOVING ACROSS CENTRAL AND EAST CENTRAL MISSOURI OVERNIGHT AND EARLY SATURDAY MORNING. BECAUSE THE STORMS WILL CONTINUE TO IMPACT THE SAME AREAS...HEAVY RAIN AND FLASH FLOODING WILL BECOME A VERY REAL THREAT. ILZ098>102-MOZ041-047>052-059>065-072-073-141500- /O.NEW.KLSX.FF.A.0002.120414T0219Z-120414T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-BOONE MO- MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO-LINCOLN MO- GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO-ST. LOUIS MO- ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO-WASHINGTON MO- INCLUDING THE CITIES OF...EDWARDSVILLE...BELLEVILLE...COLUMBIA... JEFFERSON CITY...ST CHARLES...UNION...ST LOUIS 919 PM CDT FRI APR 13 2012 ...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY MORNING... THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF SOUTHWEST ILLINOIS AND MISSOURI...INCLUDING THE FOLLOWING COUNTIES...IN SOUTHWEST ILLINOIS...CALHOUN IL...JERSEY IL...MADISON IL...MONROE IL AND ST. CLAIR IL. IN MISSOURI...BOONE MO...CALLAWAY MO...COLE MO...CRAWFORD MO...FRANKLIN MO...GASCONADE MO...JEFFERSON MO...LINCOLN MO...MONITEAU MO...MONTGOMERY MO...OSAGE MO... ST. CHARLES MO...ST. LOUIS CITY MO...ST. LOUIS MO...WARREN MO AND WASHINGTON MO. * THROUGH SATURDAY MORNING * SEVEREAL ROUNDS OF THUNDERSTORMS WILL BE MOVING ACROSS CENTRAL AND EAST CENTRAL MISSOURI AND SOUTHWEST ILLINOIS OVERNIGHT AND EARLY SATURDAY MORNING. THIS WILL RESULT IN HEAVY RAINS OF 1 TO 3 INCHES...WITH LOCALLY HIGHER AMOUNTS. * RUNOFF FROM THIS HEAVY RAIN WILL CAUSE RAPID RISES AND POSSIBLY FLOODING ON SMALL CREEKS AND STREAMS...AND WILL ALSO CAUSE FLOODING IN LOW LYING AND POORLY DRAINED 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
2 follow-up statements
280 WGUS63 KLSX 140900 FFALSX FLOOD WATCH NATIONAL WEATHER SERVICE ST LOUIS MO 400 AM CDT SAT APR 14 2012 ILZ098>102-MOZ041-047>052-059>065-072-073-141500- /O.CON.KLSX.FF.A.0002.000000T0000Z-120414T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-BOONE MO- MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO-LINCOLN MO- GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO-ST. LOUIS MO- ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO-WASHINGTON MO- INCLUDING THE CITIES OF...EDWARDSVILLE...BELLEVILLE...COLUMBIA... JEFFERSON CITY...ST CHARLES...UNION...ST LOUIS 400 AM CDT SAT APR 14 2012 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 AM CDT THIS MORNING... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF SOUTHWEST ILLINOIS AND MISSOURI...INCLUDING THE FOLLOWING COUNTIES...IN SOUTHWEST ILLINOIS...CALHOUN IL... JERSEY IL...MADISON IL...MONROE IL AND ST. CLAIR IL. IN MISSOURI...BOONE MO...CALLAWAY MO...COLE MO...CRAWFORD MO... FRANKLIN MO...GASCONADE MO...JEFFERSON MO...LINCOLN MO... MONITEAU MO...MONTGOMERY MO...OSAGE MO...ST. CHARLES MO...ST. LOUIS CITY MO...ST. LOUIS MO...WARREN MO AND WASHINGTON MO. * UNTIL 10 AM CDT THIS MORNING * DOPPLER RADAR ESTIMATES THAT 1 TO 2 INCHES OF RAIN HAS ALREADY FALLEN OVER THE PAST 24 HOURS...WITH LOCALIZED AMOUNTS IN EXCESS OF 3 INCHES ACROSS PARTS OF CENTRAL MISSOURI. ADDITIONAL HEAVY RAIN IS LIKELY THIS MORNING ACROSS THE WATCH AREA. * RUNOFF FROM THIS HEAVY RAIN WILL CAUSE RAPID RISES AND POSSIBLY FLOODING ON SMALL CREEKS AND STREAMS...AND WILL ALSO CAUSE FLOODING IN LOW LYING AND POORLY DRAINED 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. && $$ CARNEY
048 WGUS63 KLSX 141518 FFALSX FLOOD WATCH NATIONAL WEATHER SERVICE ST LOUIS MO 1018 AM CDT SAT APR 14 2012 ILZ098>102-MOZ041-047>052-059>065-072-073-141630- /O.EXP.KLSX.FF.A.0002.000000T0000Z-120414T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-BOONE MO- MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO-LINCOLN MO- GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO-ST. LOUIS MO- ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO-WASHINGTON MO- INCLUDING THE CITIES OF...EDWARDSVILLE...BELLEVILLE...COLUMBIA... JEFFERSON CITY...ST CHARLES...UNION...ST LOUIS 1018 AM CDT SAT APR 14 2012 ...FLASH FLOOD WATCH HAS EXPIRED... THE FLASH FLOOD WATCH FOR PORTIONS OF SOUTHWEST ILLINOIS AND CENTRAL AND SOUTHEAST MISSOURI HAS EXPIRED. ALTHOUGH SHOWERS AND THUNDERSTORMS WILL CONTINUE IN THIS AREA FOR THE REST OF THE MORNING...THE RAINFALL RATES OR INTENSITY OF THE RAINFALL WILL WEAKEN. RESIDENTS OF THIS AREA WILL STILL NEED TO DRIVE WITH EXTRA CAUTION AS PREVIOUS HEAVY RAINFALL HAS CAUSED SOME CREEKS TO FLOOD WITH WATER OVER ROADWAYS IN PLACES THAT HAS YET TO RECEDE. $$ GKS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 14, 1:26 AM CDT | River Flood Warning | LSX | Cole | 3 days |
| Apr 14, 1:53 AM CDT | Areal Flood Advisory | LSX | Saint Louis, City of Saint Louis | 4 hr |
| Apr 14, 6:27 AM CDT | Areal Flood Advisory | LSX | Cole, Osage | 4 hr |
| Apr 14, 7:06 AM CDT | River Flood Warning | LSX | Osage | 24 hr |
| Apr 14, 7:13 AM CDT | Flash Flood Warning | LSX | Cole, Osage | 6 hr |
| Apr 14, 7:38 AM CDT | Areal Flood Advisory | LSX | Gasconade | 4 hr |
| Apr 14, 11:14 AM CDT | River Flood Warning | LSX | Saint Charles | 20 hr |
| Apr 14, 3:30 PM CDT | River Flood Warning | LSX | Lincoln | 16 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.