Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 8, NWS Huntsville, AL

March 25, 20214 counties in Alabama

NWS Huntsville, AL issued this flash flood warning at Mar 25, 2021, 2:21 PM CDT for 4 counties in 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
Mar 25, 2021, 2:21 PM CDT (19:21 UTC)
Expired
Mar 25, 2021, 5:23 PM CDT
In force
3 hr
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Flood severity
None

Counties Cullman County, AL, Lawrence County, AL, Marshall County, AL, Morgan County, AL

The radar

The Birmingham radar (KBMX), 96 km from the middle of the area, began a volume at 19:23 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

TimeReportWhereRemark
Mar 25, 3:05 PM CDTFLASH FLOOD4 Nnw Arab, ALMAT MORROW ROAD, JUST WEST OF U.S. 231, IS REPORTEDLY ABOUT TO BE WASHED OUT. REPORT RELAYED VIA SOCIAL MEDIA.
Mar 25, 5:06 PM CDTFLASH FLOOD1 Se Falkville, ALDOUGLAS ROAD IN FALKVILLE CLOSED DUE TO FLOODING. DEPTH OF WATER UNKNOWN AT THIS TIME.

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, 7.4 hours before the alert went out and 95 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.

Skew-T log-pSkew-T log-p diagram, Birmingham, AL at 12:00Z on 2021-03-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 54 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2021-03-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 613 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
54 J/kg
Mixed-layer CIN
-239 J/kg
Mixed-layer LCL
507 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
613 m²/s²
0-3 km storm-relative helicity
713 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.6

Open this sounding in Storm Lab

The text

As transmitted.

853 
WGUS54 KHUN 251921
FFWHUN
ALC043-079-095-103-252230-
/O.NEW.KHUN.FF.W.0008.210325T1921Z-210325T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Huntsville AL
221 PM CDT Thu Mar 25 2021

The National Weather Service in Huntsville has issued a

* Flash Flood Warning for...
  Cullman County in north central Alabama...
  Southern Morgan County in north central Alabama...
  West Central Marshall County in northeastern Alabama...
  Southeastern Lawrence County in northwestern Alabama...

* Until 530 PM CDT.

* At 221 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across much of Cullman County and portions of Southern 
  Morgan and Western Marshall Counties. These locations have already 
  received upwards of 3 to 4 inches of rainfall earlier today, and 
  experienced flash flooding along Interstate 65 and in many other 
  locations this morning.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Cullman, Hartselle, Arab, Hanceville, Good Hope, Falkville, Holly 
  Pond, Dodge City, Baldwin, Vinemont, Baileyton, West Point, Eva, 
  Garden City, Colony, Phelan, Lacon, Cole Springs, Logan and 
  Battleground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3440 8711 3445 8651 3429 8647 3409 8667
      3408 8670 3407 8669 3397 8677 3395 8684
      3393 8686 3393 8689 3392 8689 3390 8692
      3386 8692 3386 8696 3386 8701 3389 8701
      3390 8710 3390 8708 3396 8712

FLASH FLOOD...RADAR INDICATED

$$

12
2 follow-up statements
269 
WGUS74 KHUN 252015
FFSHUN

Flash Flood Statement
National Weather Service Huntsville AL
315 PM CDT Thu Mar 25 2021

ALC043-079-095-103-252230-
/O.CON.KHUN.FF.W.0008.000000T0000Z-210325T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cullman AL-Lawrence AL-Marshall AL-Morgan AL-
315 PM CDT Thu Mar 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM CDT THIS 
AFTERNOON FOR CULLMAN, SOUTHERN MORGAN, WEST CENTRAL MARSHALL AND 
SOUTHEASTERN LAWRENCE COUNTIES...

At 315 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across much of Cullman County, with the greatest flash flood 
threat unfolding West of Good Hope, South of Cullman, westward to 
the Walker County line near Nesmith and Helicon. Locations as far 
south as Colony in Cullman County have the highest threat of life 
threatening flash flooding over the next 1 to 2 hours!

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Doppler radar.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Cullman, Hartselle, Arab, Hanceville, Good Hope, Falkville, Holly 
  Pond, Dodge City, Baldwin, Vinemont, Baileyton, West Point, Eva, 
  Garden City, Colony, Phelan, Lacon, Cole Springs, Logan and 
  Battleground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3440 8711 3445 8651 3429 8647 3409 8667
      3408 8670 3407 8669 3397 8677 3395 8684
      3393 8686 3393 8689 3392 8689 3390 8692
      3386 8692 3386 8696 3386 8701 3389 8701
      3390 8710 3390 8708 3396 8712

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

12
204 
WGUS74 KHUN 252223
FFSHUN

Flash Flood Statement
National Weather Service Huntsville AL
523 PM CDT Thu Mar 25 2021

ALC043-079-095-103-252233-
/O.CAN.KHUN.FF.W.0008.000000T0000Z-210325T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cullman AL-Lawrence AL-Marshall AL-Morgan AL-
523 PM CDT Thu Mar 25 2021

...FLASH FLOOD WARNING FOR CULLMAN, SOUTHERN MORGAN, WEST CENTRAL 
MARSHALL AND SOUTHEASTERN LAWRENCE COUNTIES HAS BEEN REPLACED WITH A 
FLOOD WARNING...

A Flood Warning has replaced the original Flash Flood Warning due to 
heavy rainfall moving out of the warning area. Lingering flooding 
concerns will occur over the next few hours as runoff from recent 
rainfall continues.

LAT...LON 3440 8711 3445 8651 3429 8647 3409 8667
      3408 8670 3407 8669 3397 8677 3395 8684
      3393 8686 3393 8689 3392 8689 3390 8692
      3386 8692 3386 8696 3386 8701 3389 8701
      3390 8710 3390 8708 3396 8712

$$

12

The office that day

Everything else NWS Huntsville, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 25, 3:01 AM CDTWind AdvisoryHUNColbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more20 hr
Mar 25, 6:40 AM CDTSpecial Weather StatementHUNMarshall50 min
Mar 25, 7:37 AM CDTSpecial Weather StatementHUNColbert38 min
Mar 25, 7:55 AM CDTSpecial Weather StatementHUNCullman50 min
Mar 25, 8:20 AM CDTSevere Thunderstorm WarningHUNCullman, Morgan25 min
Mar 25, 8:38 AM CDTSevere Thunderstorm WarningHUNMarshall52 min
Mar 25, 8:50 AM CDTSpecial Weather StatementHUNCullman40 min
Mar 25, 9:13 AM CDTSevere Thunderstorm WarningHUNDeKalb, Jackson62 min
Mar 25, 9:16 AM CDTFlash Flood WarningHUNCullman, Marshall, Morgan4 hr
Mar 25, 10:22 AM CDTFlash Flood WarningHUNCullman, DeKalb, Jackson, Madison, Marshall, Morgan3 hr
Mar 25, 10:49 AM CDTSpecial Weather StatementHUNMarshall, Morgan41 min
Mar 25, 2:35 PM CDTFlash Flood WarningHUNLawrence, Limestone, Morgan3 hr
Mar 25, 2:37 PM CDTSpecial Weather StatementHUNColbert, Lauderdale38 min
Mar 25, 2:45 PM CDTFlash Flood WarningHUNColbert, Franklin, Lauderdale, Lawrence3 hr
Mar 25, 2:53 PM CDTTornado WarningHUNColbert, Franklin, Lauderdale21 min
Mar 25, 2:56 PM CDTSpecial Weather StatementHUNJackson34 min
Mar 25, 3:07 PM CDTFlash Flood WarningHUNCullman, DeKalb, Jackson, Madison, Marshall, Morgan3 hr
Mar 25, 4:08 PM CDTSpecial Weather StatementHUNMarshall37 min
Mar 25, 4:44 PM CDTSpecial Weather StatementHUNDeKalb46 min
Mar 25, 5:01 PM CDTSpecial Weather StatementHUNCullman29 min
Mar 25, 5:16 PM CDTAreal Flood WarningHUNColbert, Franklin, Lauderdale, Lawrence4 hr
Mar 25, 5:21 PM CDTAreal Flood WarningHUNLawrence, Limestone, Morgan5 hr
Mar 25, 5:23 PM CDTAreal Flood WarningHUNCullman, Lawrence, Marshall, Morgan5 hr
Mar 25, 6:13 PM CDTAreal Flood WarningHUNCullman, DeKalb, Jackson, Madison, Marshall, Morgan3 hr
Mar 25, 6:22 PM CDTFlash Flood Warning Considerable damage threatHUNDeKalb3 hr
Mar 25, 6:24 PM CDTSpecial Weather StatementHUNDeKalb, Marshall51 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.