Alert archive / Alabama / Flash Flood Warnings in 2021
Flash Flood Warning 43, NWS Birmingham, AL
NWS Birmingham, AL issued this flash flood warning at Jul 27, 2021, 3:32 PM CDT for Shelby County, Alabama. It was in force for 3 hr. 2 reports 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
- Jul 27, 2021, 3:32 PM CDT (20:32 UTC)
- Expired
- Jul 27, 2021, 6:08 PM CDT
- In force
- 3 hr
- Issued by
- NWS Birmingham, AL
- Area
- Storm-based polygon
- Flood severity
- None
County Shelby County, AL
The radar
The Birmingham radar (KBMX), 13 km from the middle of the area, began a volume at 20:32 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 |
|---|---|---|---|
| Jul 27, 3:37 PM CDT | FLASH FLOOD | Alabaster, AL | SIGNIFICANT FLOODING IN SEVERAL SPOTS AROUND ALABASTER. WATER WAS OVER BRIDGES AND ROADWAYS WERE IMPASSABLE. |
| Jul 27, 3:37 PM CDT | FLASH FLOOD | Alabaster, AL | SIGNIFICANT FLOODING IN SEVERAL SPOTS AROUND ALABASTER. WATER WAS OVER BRIDGES AND ROADWAYS WERE IMPASSABLE INCLUDING HWY 119, HWY 31, 1ST ST W, 8TH ST SW, AND OLD SIMMSVILLE RD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Birmingham, AL (KBMX), launched 12:00Z, 8.5 hours before the alert went out and 12 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
- 1546 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 923 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- -17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
907
WGUS54 KBMX 272032
FFWBMX
ALC117-272330-
/O.NEW.KBMX.FF.W.0043.210727T2032Z-210727T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
332 PM CDT Tue Jul 27 2021
The National Weather Service in Birmingham has issued a
* Flash Flood Warning for...
Southwestern Shelby County in central Alabama...
* Until 630 PM CDT.
* At 332 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Across parts of the warning
area, as much as 2 and 3 inches of rain have fallen onto already
wet ground, with additional heavy rain expected to continue. 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...
Hoover, Alabaster, Pelham, Helena, Calera, Montevallo, Indian
Springs Village, Wilton, Maylene, Shelby County Airport, American
Village, University Of Montevallo, Oak Mountain Amphitheater,
Riverchase, Oak Mountain State Park, Siluria, Alabaster Veterans
Park, Saginaw, Saddle Lake Farms and Camp Branch.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3337 8679 3334 8675 3332 8674 3329 8670
3319 8669 3317 8673 3307 8679 3307 8688
3312 8694 3327 8694 3328 8693 3329 8693
3331 8690 3333 8689 3333 8688 3333 8683
3336 8683 3336 8681 3337 8680
FLASH FLOOD...RADAR INDICATED
$$
89^GSatterwhite3 follow-up statements
483
WGUS74 KBMX 272037
FFSBMX
Flash Flood Statement
National Weather Service Birmingham AL
337 PM CDT Tue Jul 27 2021
ALC117-272330-
/O.CON.KBMX.FF.W.0043.000000T0000Z-210727T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Shelby AL-
337 PM CDT Tue Jul 27 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM CDT THIS
EVENING FOR SOUTHWESTERN SHELBY COUNTY...
At 337 PM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2 and 3 inches of rain have
fallen across parts of the warning area, with heavy rain expected to
continue over the next hour, or so. Flash flooding is already
occurring.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Hoover, Alabaster, Pelham, Helena, Calera, Montevallo, Indian
Springs Village, Wilton, Maylene, Shelby County Airport, American
Village, University Of Montevallo, Oak Mountain Amphitheater,
Riverchase, Oak Mountain State Park, Siluria, Alabaster Veterans
Park, Saginaw, Saddle Lake Farms and Camp Branch.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3337 8679 3334 8675 3332 8674 3329 8670
3319 8669 3317 8673 3307 8679 3307 8688
3312 8694 3327 8694 3328 8693 3329 8693
3331 8690 3333 8689 3333 8688 3333 8683
3336 8683 3336 8681 3337 8680
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
89^GSatterwhite410
WGUS74 KBMX 272211
FFSBMX
Flash Flood Statement
National Weather Service Birmingham AL
511 PM CDT Tue Jul 27 2021
ALC117-272330-
/O.CON.KBMX.FF.W.0043.000000T0000Z-210727T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Shelby AL-
511 PM CDT Tue Jul 27 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM CDT THIS
EVENING FOR SOUTHWESTERN SHELBY COUNTY...
At 511 PM CDT, Areas of flash flooding have been reported by the
public and law enforcement. Radar estimates totals of two to four
inches. Heavy rainfall has ended across the warning area, though
instances of light rain may occur. Flood waters are expected to
gradually recede over the coming hours.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
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...
Hoover, Alabaster, Pelham, Helena, Calera, Montevallo, Indian
Springs Village, Wilton, Maylene, Shelby County Airport, American
Village, University Of Montevallo, Oak Mountain Amphitheater,
Riverchase, Oak Mountain State Park, Siluria, Alabaster Veterans
Park, Saginaw, Saddle Lake Farms and Camp Branch.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3337 8679 3334 8675 3332 8674 3329 8670
3319 8669 3317 8673 3307 8679 3307 8688
3312 8694 3327 8694 3328 8693 3329 8693
3331 8690 3333 8689 3333 8688 3333 8683
3336 8683 3336 8681 3337 8680
FLASH FLOOD...OBSERVED
$$
89^GSatterwhite387
WGUS74 KBMX 272308
FFSBMX
Flash Flood Statement
National Weather Service Birmingham AL
608 PM CDT Tue Jul 27 2021
ALC117-272318-
/O.CAN.KBMX.FF.W.0043.000000T0000Z-210727T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Shelby AL-
608 PM CDT Tue Jul 27 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN SHELBY COUNTY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a significant threat. Please continue to
heed remaining road closures.
LAT...LON 3337 8679 3334 8675 3332 8674 3329 8670
3319 8669 3317 8673 3307 8679 3307 8688
3312 8694 3327 8694 3328 8693 3329 8693
3331 8690 3333 8689 3333 8688 3333 8683
3336 8683 3336 8681 3337 8680
$$
89^GSatterwhiteThe office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 8:51 PM CDT | Areal Flood Advisory | BMX | Pickens | 100 min |
| Jul 26, 10:05 PM CDT | Special Weather Statement | BMX | Russell | 40 min |
| Jul 27, 4:04 AM CDT | Heat Advisory | BMX | Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more | 6 days |
| Jul 27, 12:30 PM CDT | Special Weather Statement | BMX | Montgomery | 45 min |
| Jul 27, 12:37 PM CDT | Special Weather Statement | BMX | Tallapoosa | 38 min |
| Jul 27, 1:25 PM CDT | Special Weather Statement | BMX | Tallapoosa | 35 min |
| Jul 27, 1:52 PM CDT | Special Weather Statement | BMX | Coosa | 38 min |
| Jul 27, 2:33 PM CDT | Areal Flood Advisory | BMX | Shelby | 117 min |
| Jul 27, 2:39 PM CDT | Areal Flood Advisory | BMX | Jefferson, Shelby | 111 min |
| Jul 27, 2:47 PM CDT | Areal Flood Advisory | BMX | Clay | 3 hr |
| Jul 27, 3:06 PM CDT | Areal Flood Advisory | BMX | Shelby | 3 hr |
| Jul 27, 3:19 PM CDT | Areal Flood Advisory | BMX | Calhoun, Cleburne, Talladega | 3 hr |
| Jul 27, 3:48 PM CDT | Areal Flood Advisory | BMX | Jefferson | 2 hr |
| Jul 27, 4:58 PM CDT | Areal Flood Advisory | BMX | Bibb | 2 hr |
| Jul 27, 5:22 PM CDT | Areal Flood Advisory | BMX | Etowah | 2 hr |
| Jul 27, 5:26 PM CDT | Areal Flood Advisory | BMX | Fayette, Tuscaloosa | 2 hr |
| Jul 27, 6:02 PM CDT | Special Weather Statement | BMX | Dallas | 43 min |
Nearby
Flash Flood Warnings in Alabama, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.