Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 9, NWS Huntsville, AL

March 25, 2021Lawrence County, Limestone County, Morgan County, Alabama

NWS Huntsville, AL issued this flash flood warning at Mar 25, 2021, 2:35 PM CDT for Lawrence County, Limestone County, Morgan County, Alabama. It was in force for 3 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
Mar 25, 2021, 2:35 PM CDT (19:35 UTC)
Expired
Mar 25, 2021, 5:21 PM CDT
In force
3 hr
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Flood severity
None

Counties Lawrence County, AL, Limestone County, AL, Morgan County, AL

The radar

The Northeast Alabama radar (KHTX), 109 km from the middle of the area, began a volume at 19:37 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, 2:59 PM CDTFLASH FLOOD1 Wnw Decatur, AL1700-BLOCK OF BETTY STREET SW HAS SIGNIFICANT WATER IN THE ROADWAY.

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, 7.6 hours before the alert went out and 138 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.

446 
WGUS54 KHUN 251935
FFWHUN
ALC079-083-103-252245-
/O.NEW.KHUN.FF.W.0009.210325T1935Z-210325T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Huntsville has issued a

* Flash Flood Warning for...
  Southeastern Limestone County in north central Alabama...
  Northwestern Morgan County in north central Alabama...
  Southeastern Lawrence County in northwestern Alabama...

* Until 545 PM CDT.

* At 235 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across Northwestern Morgan, Southeastern Limestone, and 
  portions of far Eastern Lawrence Counties. 1 to 2 inches of rain 
  has fallen within the last 30 minutes to an hour, which will cause 
  Flash Flooding to occur shortly in these locations.

  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...
  Decatur, Madison, Hartselle, Priceville, Trinity, Tanner, 
  Somerville, Hillsboro, Mooresville, Basham, Neel, Caddo, Belle 
  Mina, Speake and eastern Bankhead National Forest.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3429 8720 3439 8720 3468 8719 3474 8679
      3454 8679 3443 8679 3440 8711 3429 8711
      3429 8712 3429 8714 3429 8716 3429 8717
      3429 8718

FLASH FLOOD...RADAR INDICATED

$$

12
1 follow-up statement
428 
WGUS74 KHUN 252221
FFSHUN

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

ALC079-083-103-252231-
/O.CAN.KHUN.FF.W.0009.000000T0000Z-210325T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lawrence AL-Limestone AL-Morgan AL-
521 PM CDT Thu Mar 25 2021

...FLASH FLOOD WARNING FOR SOUTHEASTERN LIMESTONE, NORTHWESTERN 
MORGAN 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 local area. Runoff will continue 
over the next few hours, and the Flood Warning will hand any of 
these lingering concerns through about 10pm.

LAT...LON 3429 8720 3439 8720 3468 8719 3474 8679
      3454 8679 3443 8679 3440 8711 3429 8711
      3429 8712 3429 8714 3429 8716 3429 8717
      3429 8718

$$

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, 2:21 PM CDTFlash Flood WarningHUNCullman, Lawrence, Marshall, 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.