Alert archive / Alabama / Flash Flood Warnings in 2021
Flash Flood Warning 20, NWS Mobile, AL
NWS Mobile, AL issued this flash flood warning at May 4, 2021, 8:36 PM CDT for Mobile County, Alabama. It was in force for 6 hr. 1 report 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
- May 4, 2021, 8:36 PM CDT (01:36 UTC)
- Expired
- May 5, 2021, 2:45 AM CDT
- In force
- 6 hr
- Issued by
- NWS Mobile, AL
- Area
- Storm-based polygon
- Flood severity
- None
County Mobile County, AL
The radar
The Mobile radar (KMOB), 15 km from the middle of the area, began a volume at 01:39 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 |
|---|---|---|---|
| May 4, 8:50 PM CDT | FLASH FLOOD | 1 W Downtown Mobile, AL | SEVERAL INTERSECTIONS UNDER WATER ALONG OLD SHELL RD (NAMELY, THE INTERSECTIONS AT HALLET ST AND PINE ST.). REPORTS VIA SOCIAL MEDIA. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 00:00Z, 1.6 hours before the alert went out and 162 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
- 3152 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 647 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 3.1
- Supercell composite
- 10.5
The text
As transmitted.
935
WGUS54 KMOB 050136
FFWMOB
ALC097-050745-
/O.NEW.KMOB.FF.W.0020.210505T0136Z-210505T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
836 PM CDT Tue May 4 2021
The National Weather Service in Mobile has issued a
* Flash Flood Warning for...
Central Mobile County in southwestern Alabama...
* Until 245 AM CDT Wednesday.
* At 836 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. The expected rainfall rate is 1 to 2 inches in 1
hour. Additional rainfall amounts of 1 to 3 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...
Midtown Mobile, Downtown Mobile, Prichard, Chickasaw, I10 And I65,
I65 And I165, Tacon, Mertz, Neshota, Navco and Plateau.
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.
&&
LAT...LON 3060 8813 3062 8816 3068 8816 3075 8811
3077 8807 3077 8806 3077 8803 3076 8803
3066 8803 3065 8806 3061 8805 3061 8811
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$The office that day
Everything else NWS Mobile, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 7:26 PM CDT | Special Marine Warning | MOB | 2 hr | |
| May 4, 7:28 PM CDT | Special Weather Statement | MOB | Covington, Escambia | 62 min |
| May 4, 7:33 PM CDT | Special Weather Statement | MOB | Baldwin, Mobile | 57 min |
| May 4, 7:44 PM CDT | Severe Thunderstorm Warning | MOB | Covington, Crenshaw | 32 min |
| May 4, 8:15 PM CDT | River Flood Warning | MOB | Baldwin | 29 hr |
| May 4, 8:20 PM CDT | Areal Flood Advisory | MOB | Mobile | 6 hr |
| May 4, 8:28 PM CDT | Areal Flood Advisory | MOB | Baldwin | 6 hr |
| May 4, 9:41 PM CDT | Special Marine Warning | MOB | 94 min | |
| May 5, 12:35 AM CDT | Areal Flood Advisory | MOB | Baldwin | 4 hr |
| May 5, 1:50 AM CDT | Flash Flood Warning | MOB | Baldwin | 6 hr |
| May 5, 2:27 AM CDT | River Flood Warning | MOB | Baldwin | 23 hr |
| May 5, 2:30 AM CDT | River Flood Warning | MOB | Baldwin | 22 hr |
| May 5, 2:50 AM CDT | Special Marine Warning | MOB | 85 min | |
| May 5, 6:29 AM CDT | Special Weather Statement | MOB | Baldwin | 46 min |
| May 5, 7:07 AM CDT | Areal Flood Advisory | MOB | Mobile | 3 hr |
| May 5, 7:19 AM CDT | Special Marine Warning | MOB | 86 min | |
| May 5, 7:43 AM CDT | Flash Flood Warning | MOB | Baldwin | 6 hr |
| May 5, 8:00 AM CDT | River Flood Warning | MOB | Clarke, Monroe, Wilcox | 7 days |
| May 5, 8:00 AM CDT | River Flood Warning | MOB | Dallas, Monroe, Wilcox | 4 days |
| May 5, 8:31 AM CDT | Special Marine Warning | MOB | 59 min | |
| May 5, 8:57 AM CDT | Flash Flood Warning | MOB | Mobile | 4 hr |
| May 5, 12:02 PM CDT | Special Marine Warning | MOB | 88 min | |
| May 5, 1:24 PM CDT | Areal Flood Advisory | MOB | Mobile | 96 min |
| May 5, 1:26 PM CDT | Special Marine Warning | MOB | 64 min | |
| May 5, 1:44 PM CDT | Areal Flood Advisory | MOB | Baldwin | 3 hr |
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.