Alert archive / Alabama / Areal Flood Warnings in 2017

Areal Flood Warning 3, NWS Birmingham, AL

May 21, 2017Lowndes County, Montgomery County, Alabama

NWS Birmingham, AL issued this areal flood warning at May 21, 2017, 4:25 AM CDT for Lowndes County, Montgomery County, Alabama. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 21, 2017, 4:25 AM CDT (09:25 UTC)
Expired: May 21, 2017, 7:30 AM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Lowndes County, AL, Montgomery County, AL

The radar

The Maxwell AFB radar (KMXX), 71 km from the middle of the area, began a volume at 09:26 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.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 9.4 hours before the alert went out and 223 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: 86 J/kg
Mixed-layer CIN: -265 J/kg
Mixed-layer LCL: 1583 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Birmingham, AL wrote its last area forecast discussion before this areal flood warning went out at May 21, 3:48 AM CDT, 37 minutes earlier.

Area forecast discussion, May 21, 3:48 AM CDT, 37 minutes before

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Hazardous weather outlook, May 20, 8:45 PM CDT, 7 hours 40 minutes before

Hazardous Weather Outlook
National Weather Service Birmingham AL
845 PM CDT Sat May 20 2017

ALZ011>015-017>050-220445-
Marion-Lamar-Fayette-Winston-Walker-Blount-Etowah-Calhoun-Cherokee-
Cleburne-Pickens-Tuscaloosa-Jefferson-Shelby-St. Clair-Talladega-
Clay-Randolph-Sumter-Greene-Hale-Perry-Bibb-Chilton-Coosa-Tallapoosa-
Chambers-Marengo-Dallas-Autauga-Lowndes-Elmore-Montgomery-Macon-
Bullock-Lee-Russell-Pike-Barbour-
845 PM CDT Sat May 20 2017

This Hazardous Weather Outlook is for the counties served by the
National Weather Service office in Birmingham.

.DAY ONE...through Tonight.

Very heavy rainfall in a short period of time may lead to localized
flash flooding. Some areas may receive 2 to 3 inches of rain. The
heaviest rain will occur east of a line from Oneonta to Birmingham
to Selma.

Numerous showers and thunderstorms will continue overnight. A couple
isolated storms could produce damaging wind gusts up to 60 mph
and small hail. These storms will also be limited to areas east of a
line from Oneonta to Birmingham to Selma.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management may be needed
overnight.

In the hours before

Special weather statement, May 20, 11:13 PM CDT, 5 hours 12 minutes before

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Special weather statement, May 20, 11:44 PM CDT, 4 hours 41 minutes before

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Special weather statement, May 21, 12:03 AM CDT, 4 hours 22 minutes before

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Special weather statement, May 21, 12:33 AM CDT, 3 hours 52 minutes before

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Special weather statement, May 21, 1:14 AM CDT, 3 hours 11 minutes before

Special Weather Statement
National Weather Service Birmingham AL
114 AM CDT SUN MAY 21 2017

ALZ029-038-210700-
Randolph AL-Chambers AL-
114 AM CDT SUN MAY 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN RANDOLPH AND
NORTHERN CHAMBERS COUNTIES UNTIL 200 AM CDT...

At 114 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Penton to Denson to West Point. Movement
was north at 30 mph.

Pea size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Valley, Lanett, Roanoke, Lafayette, Stroud, La Fayette, Red Level,
Lakeview, Post Oak Forks, Denson, Amity Park, Abanda, Standing Rock,
Welch, Trammel Crossroads, Buffalo, Fredonia, Veasey Creek Park,
Huguley and Fairfax.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3277 8514 3287 8535 3294 8559 3327 8550
      3323 8526 3286 8519 3285 8516 3281 8517
      3277 8513
TIME...MOT...LOC 0614Z 201DEG 24KT 3297 8545 3294 8532 3287 8518

32/Davis

Local storm report, May 21, 4:11 AM CDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
411 AM CDT SUN MAY 21 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0822 PM     FLASH FLOOD      1 NW CALHOUN            32.06N 86.55W
05/20/2017                   LOWNDES            AL   911 CALL CENTER

            COUNTY ROAD 33 UNDERWATER NEAR CALHOUN.

&&

DAVIS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 7:11 PM CDT	Special Weather Statement	BMX	Elmore	34 min
May 20, 7:18 PM CDT	Flash Flood Warning	BMX	Cherokee	3 hr
May 20, 7:31 PM CDT	Special Weather Statement	BMX	Coosa, Tallapoosa	29 min
May 20, 7:45 PM CDT	Flash Flood Warning	BMX	Chilton, Jefferson, Shelby, Talladega	3 hr
May 20, 7:51 PM CDT	Flash Flood Warning	BMX	Autauga, Dallas, Elmore, Lowndes, Montgomery	3 hr
May 20, 8:24 PM CDT	Areal Flood Advisory	BMX	Calhoun, Etowah, St. Clair, Talladega	3 hr
May 20, 8:26 PM CDT	Special Weather Statement	BMX	Cleburne	64 min
May 20, 8:29 PM CDT	River Flood Warning	BMX	Jefferson	14 hr
May 20, 9:00 PM CDT	Flash Flood Warning	BMX	Elmore, Montgomery	3 hr
May 20, 9:21 PM CDT	Special Weather Statement	BMX	Lowndes	24 min
May 20, 9:45 PM CDT	Special Weather Statement	BMX	Pike	60 min
May 20, 10:17 PM CDT	Special Weather Statement	BMX	Bullock	58 min
May 20, 10:23 PM CDT	Flash Flood Warning	BMX	Cherokee	3 hr
May 20, 10:35 PM CDT	Flash Flood Warning	BMX	Autauga, Dallas, Elmore, Lowndes, Montgomery	6 hr
May 20, 11:04 PM CDT	Special Weather Statement	BMX	Macon	41 min
May 20, 11:13 PM CDT	Special Weather Statement	BMX	Lee	32 min
May 20, 11:40 PM CDT	Areal Flood Advisory	BMX	Macon, Tallapoosa	3 hr
May 20, 11:44 PM CDT	Special Weather Statement	BMX	Lee, Russell	61 min
May 21, 12:01 AM CDT	Flash Flood Warning	BMX	Macon	3 hr
May 21, 12:03 AM CDT	Special Weather Statement	BMX	Barbour	42 min
May 21, 12:30 AM CDT	Areal Flood Advisory	BMX	Lee	3 hr
May 21, 12:33 AM CDT	Special Weather Statement	BMX	Chambers, Lee	57 min
May 21, 1:14 AM CDT	Special Weather Statement	BMX	Chambers	46 min
May 21, 1:40 AM CDT	Areal Flood Advisory	BMX	Randolph	3 hr
May 21, 6:55 AM CDT	River Flood Warning	BMX	Montgomery	48 hr
May 21, 4:05 PM CDT	Flash Flood Watch	BMX	Autauga, Barbour, Bibb, Bullock, Chambers, Chilton and 17 more	47 hr
May 21, 6:17 PM CDT	Special Weather Statement	BMX	Lamar, Marion	43 min

Nearby

Areal Flood Warnings in Alabama, 2017 Every areal 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.