Alert archive / Missouri / Flash Flood Warnings in 2021
Flash Flood Warning 22, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Jul 1, 2021, 12:35 AM CDT for Marion County, Shelby County, Missouri. It was in force for 3 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
- Jul 1, 2021, 12:35 AM CDT (05:35 UTC)
- Expired
- Jul 1, 2021, 3:21 AM CDT
- In force
- 3 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Marion County, MO, Shelby County, MO
The radar
The St Louis radar (KLSX), 156 km from the middle of the area, began a volume at 05:36 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
Davenport, (KDVN), launched 00:00Z, 5.6 hours before the alert went out and 241 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
- 38 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 1480 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
629
WGUS53 KLSX 010535
FFWLSX
MOC127-205-010830-
/O.NEW.KLSX.FF.W.0022.210701T0535Z-210701T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
1235 AM CDT Thu Jul 1 2021
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Southwestern Marion County in northeastern Missouri...
Central Shelby County in northeastern Missouri...
* Until 330 AM CDT.
* At 1235 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1.5 and 2.5 inches of
rain have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Shelbina and Warren.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3981 9216 3977 9169 3969 9171 3969 9172
3968 9172 3971 9218
FLASH FLOOD...RADAR INDICATED
$$
BRC1 follow-up statement
924
WGUS73 KLSX 010821
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
321 AM CDT Thu Jul 1 2021
MOC127-205-010831-
/O.CAN.KLSX.FF.W.0022.000000T0000Z-210701T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Marion MO-Shelby MO-
321 AM CDT Thu Jul 1 2021
...FLASH FLOOD WARNING FOR SOUTHWESTERN MARION AND CENTRAL SHELBY
COUNTIES IN NORTHEASTERN MISSOURI HAS BEEN REPLACED WITH A FLOOD
ADVISORY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 700 AM CDT for Portions
of central, east central, and northeast Missouri.
LAT...LON 3981 9216 3977 9169 3969 9171 3969 9172
3968 9172 3971 9218
$$
BRCThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 8:41 PM CDT | Areal Flood Advisory | LSX | Saint Charles | 3 hr |
| Jun 30, 10:44 PM CDT | Areal Flood Advisory | LSX | Monroe, Ralls | 7 hr |
| Jul 1, 12:12 AM CDT | Areal Flood Advisory | LSX | Marion, Shelby | 23 min |
| Jul 1, 2:57 AM CDT | Areal Flood Advisory | LSX | Marion, Monroe, Shelby | 3 hr |
| Jul 1, 3:21 AM CDT | Areal Flood Advisory | LSX | Marion, Shelby | 2 hr |
| Jul 1, 5:16 AM CDT | Areal Flood Advisory | LSX | Callaway, Montgomery, Warren | 3 hr |
| Jul 1, 5:51 AM CDT | Areal Flood Advisory | LSX | Saint Charles | 3 hr |
| Jul 1, 6:04 AM CDT | Areal Flood Advisory | LSX | Boone, Callaway, Cole, Moniteau | 28 min |
| Jul 1, 6:32 AM CDT | Flash Flood Warning | LSX | Boone, Callaway, Cole, Moniteau | 3 hr |
| Jul 1, 6:59 AM CDT | River Flood Warning | LSX | Monroe | 37 hr |
| Jul 1, 8:21 AM CDT | River Flood Warning | LSX | Cole | 32 hr |
| Jul 1, 11:54 AM CDT | River Flood Warning | LSX | Lincoln | 27 hr |
Nearby
Flash Flood Warnings in Missouri, 2021Every flash flood warning 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.