Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 258, NWS Birmingham, AL

June 8, 2011Marengo County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jun 8, 2011, 4:45 PM CDT for Marengo County, Alabama. It was in force for 30 min. 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: Jun 8, 2011, 4:45 PM CDT (21:45 UTC)
Expired: Jun 8, 2011, 5:15 PM CDT
In force: 30 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

County Marengo County, AL

The radar

The Mobile radar (KMOB), 160 km from the middle of the area, began a volume at 21:48 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
Jun 8, 5:04 PM CDT	TSTM WND GST 45	2 Nw Nanafalia, AL	WINDS ESTIMATED BETWEEN 40 AND 50 MPH. SMALL HAIL ALSO FELL IN THE AREA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.8 hours before the alert went out and 168 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: 1072 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1033 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 24 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.

665 
WUUS54 KBMX 082145
SVRBMX
ALC091-082215-
/O.NEW.KBMX.SV.W.0258.110608T2145Z-110608T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
445 PM CDT WED JUN 8 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN MARENGO COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 515 PM CDT

* AT 443 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
  WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  NANAFALIA...OR 19 MILES SOUTHWEST OF LINDEN...AND MOVING NORTHWEST
  AT 8 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NANAFALIA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS.

&&

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

LAT...LON 3207 8811 3207 8807 3208 8805 3210 8806
      3214 8805 3215 8802 3218 8801 3224 8802
      3211 8784 3200 8800 3205 8812
TIME...MOT...LOC 2145Z 125DEG 6KT 3208 8799

$$

1 follow-up statement

553 
WWUS54 KBMX 082210
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
510 PM CDT WED JUN 8 2011

ALC091-082219-
/O.EXP.KBMX.SV.W.0258.000000T0000Z-110608T2215Z/
MARENGO AL-
510 PM CDT WED JUN 8 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MARENGO COUNTY
WILL EXPIRE AT 515 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.  HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

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

LAT...LON 3207 8811 3207 8807 3208 8805 3210 8806
      3214 8805 3215 8802 3218 8801 3224 8802
      3211 8784 3200 8800 3205 8812
TIME...MOT...LOC 2209Z 125DEG 6KT 3210 8803

$$

75

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jun 8, 3:26 PM CDT, 1 hour 19 minutes earlier.

Area forecast discussion, Jun 8, 3:26 PM CDT, 1 hour 19 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BIRMINGHAM AL
326 PM CDT WED JUN 8 2011

.UPDATE...WITH PRELIMINARY NUMBERS.

&&

.DISCUSSION...

THE UPPER-LEVEL RIDGE IS EXPECTED TO WEAKEN OVER THE FORECAST
AREA...WHILE AN UPPER-LEVEL CYCLONIC CIRCULATION...LOW...REMAINS
OVER THE GULF OF MEXICO...THROUGH THE REMAINDER OF THE WEEK.  WITH
THE WEAKENING UPPER-LEVEL RIDGE...EXPECT SUBSIDENCE INVERSION TO
WEAKEN AND THE LEVEL OF FREE OF CONVECTION TO LOWER WITH
TIME...ALLOWING FOR A SLIGHTLY BETTER PROBABILITY OF AFTERNOON
CONVECTION DURING THE AFTERNOON AND EARLY EVENING HOURS.  THE NAM
MODEL WAS MOST AGGRESSIVE WITH SHOWER/THUNDERSTORM COVERAGE THURSDAY
AND FRIDAY...WHILE GFS AND ECMWF KEEP IT MOSTLY DRY OVER THE
FORECAST AREA.  HOWEVER...BOTH THE GFS AND ECMWF SUGGEST INCREASING
COVERAGE OF PRECIPITATION THIS UPCOMING WEEKEND...AS THE
PRECIPITABLE WATER VALUES SUPPOSEDLY INCREASE.

SO...WILL LIKELY KEEP 10 TO 20 PERCENT POPS IN THE FORECAST FOR THIS
EVENING...AND AGAIN THURSDAY/FRIDAY AFTERNOONS/EVENINGS...WHILE
RAISING THE POPS UP TO 30 PERCENT FOR SATURDAY AND SUNDAY.

WITH HAVE TO MONITOR MESOSCALE CONVECTIVE SYSTEMS ADVANCING TOWARD
THE FORECAST AREA FROM THE NORTHWEST BY MONDAY OF NEXT WEEK...AS
NORTHWEST UPPER-LEVEL FLOW BECOMES THE MAIN FLOW PATTERN FOR
ALABAMA.  WITH CONTINUED DROUGHT CONDITIONS...STILL EXPECT AFTERNOON
TEMPERATURES TO REMAIN ABOVE NORMAL THROUGH THE FORECAST PERIOD.

03

&&

.AVIATION...18Z TAF DISCUSSION.

HIGH PRESSURE SURFACE AND ALOFT CONTINUES TO DOMINATE THE FORECAST
AREA BUT WITH SLIGHTLY MORE LOW LEVEL MOISTURE AVAILABLE TODAY
SCATTERED CU FIELD CAN BE SEEN DEVELOPING ON MORNING SATELLITE WITH
BEST PRECIPITABLE WATER IN THE SOUTHWEST SECTIONS. ALTHOUGH AN
ISOLATED TSRA IS POSSIBLE THIS AFTERNOON COVERAGE WILL BE TOO LOW TO
MENTION IN TAFS.  WILL INDICATE CB FOR SOUTHERN AND WESTERN SITES
(TCL, MGM AND TOI) SINCE THESE ARE THE MOST LIKELY SITES TO SEE AN
AFTERNOON SHOWER. OTHERWISE GENERALLY VFR CONDITIONS WILL PREVAIL
THROUGH THE PERIOD EXCEPT FOR SOME PATCHY MVFR IN BR 10Z-13Z TIME
FRAME. LIGHT SOUTH TO SOUTHEAST FLOW WILL CONTINUE THIS AFTERNOON
AVERAGING LESS THAN 10 KNOTS.

NOTICE...KEET TAF WILL HAVE (AMD LTD TO VIS WIND AND WX) AMENDED TO
THE END OF THE FORECAST UNTIL FURTHER NOTICE. THE CEILOMETER DATA
WILL BE GOING THROUGH NUMEROUS TESTS AND MONITORED FOR ACCURACY.

41

&&

.PRELIMINARY POINT TEMPS/POPS...
GADSDEN     65  94  64  95  68 /  10  20  20  20  20
ANNISTON    67  95  67  95  70 /  10  20  20  20  20
BIRMINGHAM  71  96  71  96  71 /  10  20  20  20  20
TUSCALOOSA  68  96  67  97  70 /  20  20  20  20  20
CALERA      69  95  68  94  70 /  10  20  20  20  20
AUBURN      69  94  68  92  71 /  10  20  20  20  20
MONTGOMERY  69  96  69  95  71 /  20  20  20  20  20
TROY        67  95  66  94  70 /  20  20  20  20  20

&&

.BMX WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

Hazardous weather outlook, Jun 8, 2:05 PM CDT, 2 hours 40 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BIRMINGHAM AL
205 PM CDT WED JUN 8 2011

ALZ011>015-017>050-091130-
AUTAUGA-BARBOUR-BIBB-BLOUNT-BULLOCK-CALHOUN-CHAMBERS-CHEROKEE-
CHILTON-CLAY-CLEBURNE-COOSA-DALLAS-ELMORE-ETOWAH-FAYETTE-GREENE-HALE-
JEFFERSON-LAMAR-LEE-LOWNDES-MACON-MARENGO-MARION-MONTGOMERY-PERRY-
PICKENS-PIKE-RANDOLPH-RUSSELL-SHELBY-ST CLAIR-SUMTER-TALLADEGA-
TALLAPOOSA-TUSCALOOSA-WALKER-WINSTON-
205 PM CDT WED JUN 8 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE COUNTIES SERVED BY THE
NATIONAL WEATHER SERVICE OFFICE IN BIRMINGHAM.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT IS NOT
EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Jun 8, 2:57 PM CDT, 1 hour 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
257 PM CDT WED JUN 8 2011

ALZ040-042-082045-
DALLAS AL-LOWNDES AL-
257 PM CDT WED JUN 8 2011

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN LOWNDES AND DALLAS
COUNTIES UNTIL 345 PM CDT...

AT 255 PM CDT...THE NATIONAL WEATHER SERVICE WAS TRACKING STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 9 MILES WEST OF GORDONVILLE
TO SNOW HILL...AND MOVING NORTHWEST AT 30 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THESE STORMS.

LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  SELMONT-WEST SELMONT...
  BELKNAP...
  DALLAS LAKE...
  SARDIS...
  OLD CAHABA PARK...

&&

LAT...LON 3204 8687 3204 8711 3227 8740 3248 8711
      3212 8673 3202 8686
TIME...MOT...LOC 1957Z 132DEG 24KT 3213 8689 3206 8698

Special weather statement, Jun 8, 4:04 PM CDT, 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
404 PM CDT WED JUN 8 2011

ALZ041-043-044-082145-
AUTAUGA AL-ELMORE AL-MONTGOMERY AL-
404 PM CDT WED JUN 8 2011

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN AUTAUGA...
NORTHWESTERN MONTGOMERY AND SOUTHWESTERN ELMORE COUNTIES UNTIL 445 PM
CDT...

AT 402 PM CDT...THE NATIONAL WEATHER SERVICE WAS TRACKING A STRONG
THUNDERSTORM NEAR HUNTER...OR NEAR PRATTVILLE...MOVING NORTHWEST AT
10 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM.

LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
  MILLBROOK...
  PRATTVILLE...
  AUTAUGA COUNTY AIRPORT...
  BOOTH...

&&

LAT...LON 3246 8663 3261 8647 3243 8627 3230 8641
TIME...MOT...LOC 2105Z 130DEG 7KT 3242 8641

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 2:57 PM CDT	Special Weather Statement	BMX	Dallas	48 min
Jun 8, 4:04 PM CDT	Special Weather Statement	BMX	Autauga	41 min
Jun 8, 4:48 PM CDT	Special Weather Statement	BMX	Chilton	27 min
Jun 8, 5:11 PM CDT	Special Weather Statement	BMX	Marengo	49 min
Jun 8, 5:17 PM CDT	Special Weather Statement	BMX	Bibb	28 min
Jun 8, 5:36 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Perry, Tuscaloosa	26 min
Jun 8, 5:41 PM CDT	Special Weather Statement	BMX	Shelby	49 min
Jun 8, 5:45 PM CDT	Severe Thunderstorm Warning	BMX	Sumter	45 min
Jun 8, 5:50 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Jefferson, Tuscaloosa, Walker	25 min
Jun 8, 6:00 PM CDT	Severe Thunderstorm Warning	BMX	Pickens	45 min
Jun 8, 6:16 PM CDT	Special Weather Statement	BMX	Walker	44 min
Jun 8, 6:28 PM CDT	Special Weather Statement	BMX	Tuscaloosa	47 min
Jun 8, 6:41 PM CDT	Special Weather Statement	BMX	Fayette	49 min
Jun 8, 6:44 PM CDT	Special Weather Statement	BMX	Pickens	31 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011 Every severe thunderstorm 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.