Alert archive / Alabama / Flash Flood Warnings in 2017

Flash Flood Warning 32, NWS Birmingham, AL

August 10, 2017Blount County, Jefferson County, Alabama

NWS Birmingham, AL issued this flash flood warning at Aug 10, 2017, 10:22 PM CDT for Blount County, Jefferson County, Alabama. It was in force for 4 hr. 6 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: Aug 10, 2017, 10:22 PM CDT (03:22 UTC)
Expired: Aug 11, 2017, 2:15 AM CDT
In force: 4 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Blount County, AL, Jefferson County, AL

The radar

The Birmingham radar (KBMX), 80 km from the middle of the area, began a volume at 03:24 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
Aug 10, 10:50 PM CDT	FLASH FLOOD	1 N Warrior, AL	WATER OVER HWY 31 ON THE NORTH SIDE OF TOWN.
Aug 10, 10:50 PM CDT	FLASH FLOOD	2 Sw Warrior, AL	PORTION OF DANA RD UNDERWATER, IMPASSABLE.
Aug 10, 10:50 PM CDT	FLASH FLOOD	Warrior, AL	WATER OVER HWY 31 ON THE NORTH SIDE OF TOWN.
Aug 10, 10:55 PM CDT	FLASH FLOOD	2 W Warrior, AL	BOTH LANES OF CANE CREEK RD UNDERWATER, JUST W OF I-65.
Aug 10, 11:15 PM CDT	FLASH FLOOD	1 Ssw Warrior, AL	HWY 31 AT DANA RD IS IMPASSABLE DUE TO FLOODING.
Aug 10, 11:15 PM CDT	FLASH FLOOD	1 Sw Warrior, AL	HWY 31 AT DANA RD IS IMPASSABLE DUE TO FLOODING.

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 00:00Z, 3.4 hours before the alert went out and 79 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: 897 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 1203 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 25 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

623 
WGUS54 KBMX 110322
FFWBMX
ALC009-073-110515-
/O.NEW.KBMX.FF.W.0032.170811T0322Z-170811T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
1022 PM CDT THU AUG 10 2017

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Southwestern Blount County in central Alabama...
  Northeastern Jefferson County in central Alabama...

* Until 1215 AM CDT

* At 1021 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. One to two inches of rain has 
  already fallen and some areas may pick up another one to two 
  inches in a short period of time. Flash flooding is expected to 
  begin shortly.

* Some locations that will experience flooding include...
  Trussville, Gardendale, Fultondale, Pinson-Clay-chalkv, Dallas,
  Center Point, Clay, Pinson, Warrior, Kimberly, Morris, Locust Fork,
  Trafford, Hayden, Nectar, County Line, Bangor, Blount Springs,
  Arkadelphia and Chalkville.

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 3400 8666 3367 8656 3367 8702 3379 8698
      3379 8697 3380 8697 3380 8695 3387 8696
      3387 8692 3391 8692 3392 8689 3394 8688
      3393 8686 3395 8684 3394 8682 3396 8682
      3395 8679 3397 8678 3398 8676 3400 8675

$$

75

2 follow-up statements

545 
WGUS74 KBMX 110419
FFSBMX

Flash Flood Statement
National Weather Service Birmingham AL
1119 PM CDT THU AUG 10 2017

ALC009-073-110515-
/O.CON.KBMX.FF.W.0032.000000T0000Z-170811T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Blount AL-Jefferson AL-
1119 PM CDT THU AUG 10 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT FOR
SOUTHWESTERN BLOUNT AND NORTHEASTERN JEFFERSON COUNTIES...

At 1117 PM CDT, local law enforcement reported flooding occurring 
from near Warrior and Rickwood Caverns to areas along I-65 southward 
to Morris And Kimberly. Some areas have received three to five 
inches of rain. Flash flooding is occurring.

Some locations that will experience flooding include...
Trussville, Gardendale, Fultondale, Pinson-Clay-chalkv, Dallas,
Center Point, Clay, Pinson, Warrior, Kimberly, Morris, Locust Fork,
Trafford, Hayden, Nectar, County Line, Bangor, Blount Springs,
Arkadelphia and Chalkville.

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.

In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.

&&

LAT...LON 3400 8666 3367 8656 3367 8702 3379 8698
      3379 8697 3380 8697 3380 8695 3387 8696
      3387 8692 3391 8692 3392 8689 3394 8688
      3393 8686 3395 8684 3394 8682 3396 8682
      3395 8679 3397 8678 3398 8676 3400 8675

$$

75

624 
WGUS54 KBMX 110504
FFWBMX
ALC009-073-110715-
/O.EXT.KBMX.FF.W.0032.000000T0000Z-170811T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
1204 AM CDT FRI AUG 11 2017

The National Weather Service in Birmingham has extended the

* Flash Flood Warning for...
  Southwestern Blount County in central Alabama...
  Northeastern Jefferson County in central Alabama...

* Until 215 AM CDT

* At 1201 AM CDT, local law enforcement reported heavy rain across 
  the warned area. Between three to five inches of rain have already 
  fallen in the warned area with locally higher totals. Flash 
  flooding is already occurring. 

* Some locations that will experience flooding include...
  Trussville, Gardendale, Fultondale, Pinson-Clay-chalkv, Dallas,
  Center Point, Clay, Pinson, Warrior, Kimberly, Morris, Locust Fork,
  Trafford, Hayden, Nectar, County Line, Bangor, Blount Springs,
  Arkadelphia and Chalkville.

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.

In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.

&&

LAT...LON 3400 8666 3367 8656 3367 8702 3379 8698
      3379 8697 3380 8697 3380 8695 3387 8696
      3387 8692 3391 8692 3392 8689 3394 8688
      3393 8686 3395 8684 3394 8682 3396 8682
      3395 8679 3397 8678 3398 8676 3400 8675

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 7:16 PM CDT	Flash Flood Warning	BMX	Blount, St. Clair	89 min
Aug 10, 7:28 PM CDT	Areal Flood Advisory	BMX	Fayette, Tuscaloosa	3 hr
Aug 10, 7:31 PM CDT	Areal Flood Advisory	BMX	Chambers, Clay, Randolph, Tallapoosa	3 hr
Aug 10, 7:52 PM CDT	Areal Flood Advisory	BMX	Barbour, Russell	3 hr
Aug 10, 7:58 PM CDT	Flash Flood Warning	BMX	Chambers, Clay, Randolph	5 hr
Aug 10, 9:13 PM CDT	Areal Flood Advisory	BMX	Winston	2 hr
Aug 10, 9:38 PM CDT	Areal Flood Advisory	BMX	Blount, Jefferson, St. Clair, Shelby, Talladega	3 hr
Aug 10, 10:13 PM CDT	Areal Flood Advisory	BMX	Calhoun, Cherokee, Cleburne, Etowah, Randolph, St. Clair	2 hr
Aug 11, 3:10 AM CDT	Flash Flood Watch	BMX	Autauga, Barbour, Blount, Bullock, Calhoun, Chambers and 19 more	16 hr
Aug 11, 4:55 AM CDT	Dense Fog Advisory	BMX	Autauga, Barbour, Bibb, Bullock, Chambers, Chilton and 19 more	3 hr

Nearby

Flash Flood Warnings in Alabama, 2017 Every flash flood warning in 2017

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.