Alert archive / Alabama / Flash Flood Warnings in 2012

Flash Flood Warning 18, NWS Huntsville, AL

April 5, 2012Lawrence County, Alabama

NWS Huntsville, AL issued this flash flood warning at Apr 5, 2012, 6:43 PM CDT for Lawrence 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: Apr 5, 2012, 6:43 PM CDT (23:43 UTC)
Expired: Apr 5, 2012, 9:21 PM CDT
In force: 3 hr
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Flood severity: None

County Lawrence County, AL

The radar

The Northeast Alabama radar (KHTX), 115 km from the middle of the area, began a volume at 23:43 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
Apr 5, 9:24 PM CDT	FLASH FLOOD	N Moulton, AL	UPDATE...FLOODING IS ONGOING NORTH OF MOULTON ON HWY 24. MOULTON TIRE IS SURROUNDED BY WATER AND THE PARKING LOT IS FLOODED. IN ADDITION...SEVERAL ROADS IN THE AREA HAVE BETWEEN 8 AND 15 INCHES OF WATER COVERING THEM. A FEW VEHICLES STALLED IN THE HIGH WATER A

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, 11.7 hours before the alert went out and 158 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 315 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 754 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -91 m²/s²
0-3 km storm-relative helicity: -43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

727 
WGUS54 KHUN 052343
FFWHUN
ALC079-060230-
/O.NEW.KHUN.FF.W.0018.120405T2343Z-120406T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HUNTSVILLE AL
643 PM CDT THU APR 5 2012

THE NATIONAL WEATHER SERVICE IN HUNTSVILLE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN LAWRENCE COUNTY IN NORTHWEST ALABAMA...

* UNTIL 930 PM CDT

* AT 641 PM CDT...TRAINED WEATHER SPOTTERS REPORTED SLOW MOVING      
  THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE CENTRAL AND      
  WESTERN PORTIONS OF LAWRENCE COUNTY. SPOTTERS ALSO REPORT THAT     
  FLASH FLOODING IS ONGOING AT THIS MOMENT...THREATENING A BUSINESS  
  ON HWY 24 NORTH OF DOWNTOWN MOULTON. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...     
  MOULTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF UP TO AN INCH AND A HALF ARE POSSIBLE 
IN WESTERN AND CENTRAL PORTIONS OF LAWRENCE COUNTY THROUGH 930 PM 
CDT. 

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 3465 8711 3454 8727 3439 8724 3439 8740
      3463 8738

$$

CA

2 follow-up statements

620 
WGUS74 KHUN 060158
FFSHUN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
858 PM CDT THU APR 5 2012

ALC079-060230-
/O.CON.KHUN.FF.W.0018.000000T0000Z-120406T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LAWRENCE AL-
858 PM CDT THU APR 5 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR EASTERN LAWRENCE COUNTY
UNTIL 930 PM CDT...

AT 858 PM CDT...WEATHER SPOTTERS REPORTED THAT FLASH FLOODING STILL 
ONGOING ON HWY 24 NORTH OF MOULTON. WATER IS APPROACHING A BUSINESS 
IN THIS AREA...AND WITH RUNOFF EXPECTED TO CONTINUE...THE THREAT FOR 
FLASH FLOODING IN THIS AREA REMAINS. IN ADDITION...CREEKS NEAR 
MOULTON ARE NEARING BANKFULL...WITH SOME MINOR FLOODING OCCURRING AS 
A RESULT.

SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...MOULTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 3465 8711 3454 8727 3439 8724 3439 8740
      3463 8738

$$

CA

301 
WGUS74 KHUN 060221
FFSHUN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
921 PM CDT THU APR 5 2012

ALC079-060235-
/O.CAN.KHUN.FF.W.0018.000000T0000Z-120406T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LAWRENCE AL-
921 PM CDT THU APR 5 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR EASTERN LAWRENCE
COUNTY IS CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER EAST LAWRENCE COUNTY. 
STREAMS AND CREEKS HAVE RECEDED OR WERE BEGINNING TO RECEDE...ENDING 
THE FLASH FLOOD THREAT. AN AREAL FLOOD WARNING IS NOW IN EFFECT FOR 
THIS AREA. IF FLOODING HAS BEEN OBSERVED...PLEASE REPORT IT TO YOUR 
LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 3465 8711 3454 8727 3439 8724 3439 8740
      3463 8738

$$


CA

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 4:47 PM CDT	Special Weather Statement	HUN	Franklin	58 min
Apr 5, 4:48 PM CDT	Special Weather Statement	HUN	Lauderdale	42 min
Apr 5, 5:16 PM CDT	Special Weather Statement	HUN	Lawrence	44 min
Apr 5, 5:31 PM CDT	Special Weather Statement	HUN	Morgan	29 min
Apr 5, 5:40 PM CDT	Severe Thunderstorm Warning	HUN	Lawrence	35 min
Apr 5, 5:46 PM CDT	Special Weather Statement	HUN	Cullman	44 min
Apr 5, 5:52 PM CDT	Severe Thunderstorm Warning	HUN	Lawrence, Limestone, Morgan	38 min
Apr 5, 6:06 PM CDT	Severe Thunderstorm Warning	HUN	Morgan	39 min
Apr 5, 6:18 PM CDT	Special Weather Statement	HUN	Madison	42 min
Apr 5, 6:31 PM CDT	Flash Flood Warning	HUN	Lawrence, Morgan	3 hr
Apr 5, 6:34 PM CDT	Special Weather Statement	HUN	Marshall	41 min
Apr 5, 6:36 PM CDT	Special Weather Statement	HUN	Jackson	39 min
Apr 5, 6:45 PM CDT	Special Weather Statement	HUN	Madison	45 min
Apr 5, 6:54 PM CDT	Flash Flood Warning	HUN	Limestone, Madison, Morgan	3 hr
Apr 5, 6:55 PM CDT	Severe Thunderstorm Warning	HUN	Limestone, Madison	27 min

Nearby

Flash Flood Warnings in Alabama, 2012 Every flash flood warning in 2012

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.