Alert archive / Missouri / Flood Watches in 2021
Flood Watch 2, NWS St. Louis, MO
NWS St. Louis, MO issued this flood watch at Mar 11, 2021, 3:27 AM CST for 20 counties in Missouri; 7 counties in Illinois. It took effect at Mar 11, 2021, 6:00 PM CST. It was in force for 41 hr.
The area
The counties it named.
The facts
- Issued
- Mar 11, 2021, 3:27 AM CST (09:27 UTC)
- In effect from
- Mar 11, 2021, 6:00 PM CST
- Expired
- Mar 13, 2021, 10:36 AM CST
- In force
- 41 hr
- Issued by
- NWS St. Louis, MO
- Flood severity
- None
All 27 counties
Clinton County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Washington 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, Iron County, MO, Jefferson County, MO, Madison County, MO, Moniteau County, MO, Montgomery County, MO, Osage County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 39 km from the middle of the area, began a volume at 09:30 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, 9.5 hours before the alert went out and 273 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
- 906 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 236 m²/s²
- 0-3 km storm-relative helicity
- 244 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
837 WGUS63 KLSX 110927 FFALSX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service St Louis MO 327 AM CST Thu Mar 11 2021 ILZ069-070-074-079-100>102-MOZ041-047>051-059>065-072>075-084-085- 099-111730- /O.NEW.KLSX.FA.A.0002.210312T0000Z-210314T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clinton IL-Marion IL-Washington IL-Randolph IL-Madison IL-Saint Clair-Monroe IL-Boone MO-Moniteau MO-Cole MO-Osage MO-Callaway MO- Montgomery MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO- Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO- Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO- Madison MO-Reynolds MO- Including the cities of Cahokia, Saint Charles, Alton, Centralia, Farmington, Sparta, Washington, Saint Louis, Jefferson City, Belleville, Salem, Edwardsville, Chester, Union, Columbia, Sullivan, and Fulton 327 AM CST Thu Mar 11 2021 ...FLOOD WATCH IN EFFECT FROM THIS EVENING THROUGH SATURDAY AFTERNOON... The National Weather Service in St Louis has issued a * Flood Watch for Portions of Illinois, including the following areas, Clinton IL, Madison IL, Marion IL, Monroe IL, Randolph IL, Saint Clair and Washington IL. Portions of Missouri, including the following areas, Boone MO, Callaway MO, Cole MO, Crawford MO, Franklin MO, Gasconade MO, Iron MO, Jefferson MO, Madison MO, Moniteau MO, Montgomery MO, Osage MO, Reynolds MO, Saint Charles MO, Saint Francois MO, Saint Louis City MO, Saint Louis MO, Sainte Genevieve MO, Warren MO and Washington MO. * From this evening through Saturday afternoon. * A prolonged period of rain through Saturday. Between 1 and 3 inches of rainfall with locally higher amounts possible. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ Byrd
5 follow-up statements
184 WGUS63 KLSX 112054 FFALSX Flood Watch National Weather Service St Louis MO 254 PM CST Thu Mar 11 2021 ILZ069-070-074-079-100>102-MOZ041-047>051-059>065-072>075-084-085- 099-121000- /O.CON.KLSX.FA.A.0002.210312T0000Z-210314T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clinton IL-Marion IL-Washington IL-Randolph IL-Madison IL-Saint Clair-Monroe IL-Boone MO-Moniteau MO-Cole MO-Osage MO-Callaway MO- Montgomery MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO- Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO- Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO- Madison MO-Reynolds MO- Including the cities of Cahokia, Saint Charles, Alton, Centralia, Farmington, Sparta, Washington, Saint Louis, Jefferson City, Belleville, Salem, Edwardsville, Chester, Union, Columbia, Sullivan, and Fulton 254 PM CST Thu Mar 11 2021 ...FLOOD WATCH REMAINS IN EFFECT FROM 6 PM CST THIS EVENING THROUGH SATURDAY AFTERNOON... The Flood Watch continues for * Portions of Illinois, including the following areas, Clinton IL, Madison IL, Marion IL, Monroe IL, Randolph IL, Saint Clair and Washington IL. Portions of Missouri, including the following areas, Boone MO, Callaway MO, Cole MO, Crawford MO, Franklin MO, Gasconade MO, Iron MO, Jefferson MO, Madison MO, Moniteau MO, Montgomery MO, Osage MO, Reynolds MO, Saint Charles MO, Saint Francois MO, Saint Louis City MO, Saint Louis MO, Sainte Genevieve MO, Warren MO and Washington MO. * From 6 PM CST this evening through Saturday afternoon. * A prolonged period of rain through Saturday. Between 1 and 3 inches of rainfall with locally higher amounts possible. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ TES
365 WGUS63 KLSX 120939 FFALSX Flood Watch National Weather Service St Louis MO 339 AM CST Fri Mar 12 2021 ILZ069-070-074-079-100>102-MOZ041-047>051-059>065-072>075-084-085- 099-140000- /O.CON.KLSX.FA.A.0002.000000T0000Z-210314T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clinton IL-Marion IL-Washington IL-Randolph IL-Madison IL-Saint Clair-Monroe IL-Boone MO-Moniteau MO-Cole MO-Osage MO-Callaway MO- Montgomery MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO- Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO- Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO- Madison MO-Reynolds MO- Including the cities of Cahokia, Saint Charles, Alton, Centralia, Farmington, Sparta, Washington, Saint Louis, Jefferson City, Belleville, Salem, Edwardsville, Chester, Union, Columbia, Sullivan, and Fulton 339 AM CST Fri Mar 12 2021 ...FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON... The Flood Watch continues for * Portions of Illinois, including the following areas, Clinton IL, Madison IL, Marion IL, Monroe IL, Randolph IL, Saint Clair and Washington IL. Portions of Missouri, including the following areas, Boone MO, Callaway MO, Cole MO, Crawford MO, Franklin MO, Gasconade MO, Iron MO, Jefferson MO, Madison MO, Moniteau MO, Montgomery MO, Osage MO, Reynolds MO, Saint Charles MO, Saint Francois MO, Saint Louis City MO, Saint Louis MO, Sainte Genevieve MO, Warren MO and Washington MO. * Through Saturday afternoon. * A prolonged period of rain will continue through Saturday. Between one half and two inches of additional rainfall with locally higher amounts possible. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ Pfahler
604 WGUS63 KLSX 122028 FFALSX Flood Watch National Weather Service St Louis MO 228 PM CST Fri Mar 12 2021 ILZ069-070-074-079-100>102-MOZ051-060-061-063-064-122130- /O.CAN.KLSX.FA.A.0002.000000T0000Z-210314T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clinton IL-Marion IL-Washington IL-Randolph IL-Madison IL-Saint Clair-Monroe IL-Montgomery MO-Warren MO-Saint Charles MO-Saint Louis MO-Saint Louis City MO- Including the cities of Cahokia, Saint Charles, Alton, Centralia, Sparta, Saint Louis, Belleville, Salem, Edwardsville, and Chester 228 PM CST Fri Mar 12 2021 ...FLOOD WATCH IS CANCELLED... The Flood Watch for Portions of Illinois, including the following areas, Clinton IL, Madison IL, Marion IL, Monroe IL, Randolph IL, Saint Clair and Washington IL. Portions of east central Missouri, including the following areas, Montgomery MO, Saint Charles MO, Saint Louis City MO, Saint Louis MO and Warren MO. has been cancelled. The Flood Watch is cancelled. Rainfall amounts are forecasted to be much less than previously for tonight and Saturday. Additional rainfall is also forecast for Sunday and Monday. $$ MOZ041-047>050-059-062-065-072>075-084-085-099-131100- /O.CON.KLSX.FA.A.0002.000000T0000Z-210314T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Boone MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Gasconade MO- Franklin MO-Jefferson MO-Crawford MO-Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Columbia, Union, Farmington, Washington, Jefferson City, Sullivan, and Fulton 228 PM CST Fri Mar 12 2021 ...FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON... The Flood Watch continues for * Portions of central, east central, and southeast Missouri, including the following areas, in central Missouri, Boone MO, Callaway MO, Cole MO, Moniteau MO and Osage MO. In east central Missouri, Crawford MO, Franklin MO, Gasconade MO, Jefferson MO and Washington MO. In southeast Missouri, Iron MO, Madison MO, Reynolds MO, Saint Francois MO and Sainte Genevieve MO. * Through Saturday afternoon. * Periods of rain, along with isolated thunderstorms, will continue in this area through Saturday. Additional rainfall amounts up to 2 inches with locally higher amounts will be possible. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ TES
792 WGUS63 KLSX 130909 FFALSX Flood Watch National Weather Service St Louis MO 309 AM CST Sat Mar 13 2021 MOZ041-050-131015- /O.CAN.KLSX.FA.A.0002.000000T0000Z-210314T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Boone MO-Callaway MO- Including the cities of Columbia and Fulton 309 AM CST Sat Mar 13 2021 ...FLOOD WATCH IS CANCELLED... The Flood Watch for Boone MO and Callaway MO has been cancelled. The Flood Watch is cancelled. The threat of flooding has shifted south of the area. Any additional rainfall through Saturday afternoon should be light. $$ MOZ047>049-059-062-065-072>075-084-085-099-140000- /O.CON.KLSX.FA.A.0002.000000T0000Z-210314T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Moniteau MO-Cole MO-Osage MO-Gasconade MO-Franklin MO-Jefferson MO-Crawford MO-Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Union, Jefferson City, Washington, Sullivan, and Farmington 309 AM CST Sat Mar 13 2021 ...FLOOD WATCH REMAINS IN EFFECT THROUGH THIS AFTERNOON... The Flood Watch continues for * Portions of central, east central, and southeast Missouri, including the following areas, in central Missouri, Cole MO, Moniteau MO and Osage MO. In east central Missouri, Crawford MO, Franklin MO, Gasconade MO, Jefferson MO and Washington MO. In southeast Missouri, Iron MO, Madison MO, Reynolds MO, Saint Francois MO and Sainte Genevieve MO. * Through this afternoon. * Periods of rain will continue in this area into Saturday. Additional rainfall amounts up to three quarters of an inch will be possible on locations that have already experienced heavy rainfall and flooding. * Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ Pfahler
728 WGUS63 KLSX 131636 FFALSX Flood Watch National Weather Service St Louis MO 1036 AM CST Sat Mar 13 2021 MOZ047>049-059-062-065-072>075-084-085-099-131745- /O.CAN.KLSX.FA.A.0002.000000T0000Z-210314T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Moniteau MO-Cole MO-Osage MO-Gasconade MO-Franklin MO-Jefferson MO-Crawford MO-Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Union, Jefferson City, Washington, Sullivan, and Farmington 1036 AM CST Sat Mar 13 2021 ...FLOOD WATCH IS CANCELLED... The Flood Watch for Portions of central, east central, and southeast Missouri, including the following areas, in central Missouri, Cole MO, Moniteau MO and Osage MO. In east central Missouri, Crawford MO, Franklin MO, Gasconade MO, Jefferson MO and Washington MO. In southeast Missouri, Iron MO, Madison MO, Reynolds MO, Saint Francois MO and Sainte Genevieve MO. has been cancelled. The Flood Watch is cancelled. The potential for new flooding is very low through the rest of today. Please continue to heed remaining road closures. $$ TES
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 11, 12:43 PM CST | Severe Thunderstorm Warning | LSX | Iron, Madison, Sainte Genevieve, Saint Francois | 22 min |
| Mar 11, 1:58 PM CST | Severe Thunderstorm Warning | LSX | Iron, Madison, Sainte Genevieve, Saint Francois | 47 min |
| Mar 11, 3:38 PM CST | Areal Flood Advisory | LSX | Crawford, Iron, Sainte Genevieve, Saint Francois, Washington | 3 hr |
Nearby
Flood Watches in Missouri, 2021Flood Watches in Illinois, 2021Every flood watch in 2021
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.