Alert archive / Alabama / Flash Flood Warnings in 2011

Flash Flood Warning 34, NWS Birmingham, AL

July 15, 2011Calhoun County, Etowah County, St. Clair County, Alabama

NWS Birmingham, AL issued this flash flood warning at Jul 15, 2011, 12:29 AM CDT for Calhoun County, Etowah County, St. Clair 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: Jul 15, 2011, 12:29 AM CDT (05:29 UTC)
Expired: Jul 15, 2011, 3:30 AM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Calhoun County, AL, Etowah County, AL, St. Clair County, AL

The radar

The Northeast Alabama radar (KHTX), 110 km from the middle of the area, began a volume at 05:33 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
Jul 15, 12:30 AM CDT	FLASH FLOOD	Gadsden, AL	A FEW ROADWAYS ARE IMPASSABLE IN AND AROUND GADSDEN. THESE ROADS ARE CLOSED DUE TO HIGH WATER.

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, 5.5 hours before the alert went out and 119 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: 1011 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 956 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: -11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

192 
WGUS54 KBMX 150529
FFWBMX
ALC015-055-115-150830-
/O.NEW.KBMX.FF.W.0034.110715T0529Z-110715T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1229 AM CDT FRI JUL 15 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN ST. CLAIR COUNTY IN ALABAMA...
  NORTHERN CALHOUN COUNTY IN EAST CENTRAL ALABAMA...
  SOUTHERN ETOWAH COUNTY IN NORTHEAST ALABAMA...

* UNTIL 330 AM CDT

* AT 1228 AM CDT...NATIONAL WEATHER SERVICE INDICATED FLASH FLOODING 
ACROSS PORTIONS OF ETOWAH COUNTY...AS WELL AS CALHOUN COUNTY. 
ROADWAYS ARE NOW CURRENTLY IMPASSIBLE ACROSS THE CITY OF GADSDEN DUE 
TO FLOODING.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...GADSDEN...
  HOKES BLUFF...MARKTON...RAINBOW CITY...ANDERSON...ATTALLA...GADSDEN
  MALL...GLENCOE...NOCCALULA FALLS...REECE CITY AND STEELE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF UP TO ONE TO 1.5 INCHES ARE POSSIBLE 
IN THE WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

TO REPORT SEVERE WEATHER...
CALL 1-800-856-0758.

LAT...LON 3400 8574 3397 8574 3397 8571 3387 8567
      3376 8593 3385 8609 3397 8627 3409 8626
      3409 8579

$$

56

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 7:50 PM CDT	Special Weather Statement	BMX	Cleburne, Randolph	40 min
Jul 14, 8:27 PM CDT	Special Weather Statement	BMX	Cleburne	33 min
Jul 14, 9:30 PM CDT	Flash Flood Warning	BMX	Cherokee	3 hr
Jul 14, 9:46 PM CDT	Flash Flood Warning	BMX	Etowah	3 hr
Jul 14, 9:56 PM CDT	Flash Flood Warning	BMX	Calhoun	82 min
Jul 15, 12:46 AM CDT	Areal Flood Advisory	BMX	Calhoun, Cleburne, St. Clair, Talladega	119 min
Jul 15, 12:22 PM CDT	Areal Flood Advisory	BMX	Elmore, Macon, Montgomery	113 min
Jul 15, 2:19 PM CDT	Areal Flood Advisory	BMX	Bullock, Montgomery, Pike	116 min

Nearby

Flash Flood Warnings in Alabama, 2011 Every flash flood warning in 2011

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.