Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 158, NWS Huntsville, AL

June 11, 2011DeKalb County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jun 11, 2011, 2:42 PM CDT for DeKalb County, Alabama. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 11, 2011, 2:42 PM CDT (19:42 UTC)
Expired: Jun 11, 2011, 3:15 PM CDT
In force: 33 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon

County DeKalb County, AL

The radar

The Northeast Alabama radar (KHTX), 58 km from the middle of the area, began a volume at 19:46 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

Birmingham, AL (KBMX), launched 12:00Z, 7.7 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: 835 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 1318 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 0 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Huntsville, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 11, 1:00 PM CDT, 1 hour 42 minutes earlier.

Area forecast discussion, Jun 11, 1:00 PM CDT, 1 hour 42 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
100 PM CDT SAT JUN 11 2011

.UPDATE...18Z AVIATION DISCUSSION.

&&

.AVIATION...
VFR CONDITIONS ARE EXPECTED THROUGH MUCH OF THE PERIOD WITH THE
EXCEPTION OF POSSIBLE MVFR CONDITIONS IN ANY AFTERNOON/EVENING TSRA
ACROSS THE AREA. DUE TO LOW CONFIDENCE IN EXACT TIMING AT BOTH
TERMINALS...HAVE ONLY INCLUDED A CB GROUP FOR NOW. ALSO INCLUDED
MVFR CONDITIONS /4SM BR/ AT KMSL BETWEEN 12/10-13Z. AFTER
SUNRISE...THE FOG WILL ERODE AT KMSL AND VFR CONDITIONS WILL RETURN
TO BOTH TERMINALS THROUGH THE TAF PERIOD.

&&

.DISCUSSION.../ISSUED 1035 AM CDT SAT JUN 11 2011/...
TEMPERATURES ACROSS THE TENNESSEE VALLEY THIS MORNING ARE STEADILY
CLIMBING INTO THE MIDDLE/UPPER 80S...WITH THE EXCEPTION OF FORT
PAYNE COMING IN AT 82 AT THIS HOUR. WHATS LEFT OF A LONE SHOWER ON
RADAR IS CURRENTLY DISSIPATING OVER NERN CULLMAN COUNTY. THE
BOUNDARY RESPONSIBLE FOR THIS ACTIVITY CAN BE SEEN CURRENTLY EXITING
THE CWA TO THE SE ON VISIBLE SATELLITE IMAGERY.

GIVEN THE EARLY-MORNING SHOWER DEVELOPMENT...WENT AHEAD AND ADDED
ISOLATED MENTION OF SHOWERS/STORMS TO ACCOUNT FOR ANY FURTHER
DEVELOPMENT THROUGH 18Z. FOR THIS AFTERNOON...BOTH LOCAL AND NSSL
WRF SHOW CONVECTION DEVELOPING FIRST OVER THE APPALACHIANS IN NE AL
AND THEN ALONG A BOUNDARY ADVECTING INTO THE AREA FROM THE
NORTHWEST. AS A RESULT...HAVE INCREASED POPS THIS AFTERNOON TO
CHANCE-POPS AREAWIDE. GIVEN THIS MINOR CHANGE...QPF GRIDS WERE
ADJUSTED SLIGHTLY AS WELL.

UPDATED ZONES OUT SHORTLY.

&&

.HUN WATCHES/WARNINGS/ADVISORIES...
AL...NONE.
TN...NONE.
&&

12

Hazardous weather outlook, Jun 11, 1:07 PM CDT, 1 hour 35 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HUNTSVILLE AL
107 PM CDT SAT JUN 11 2011

ALZ001>010-016-TNZ076-096-097-120300-
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
107 PM CDT SAT JUN 11 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH ALABAMA AND PORTIONS
OF SOUTHERN MIDDLE TENNESSEE.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

SCATTERED THUNDERSTORMS THIS AFTERNOON AND EVENING MAY BE CAPABLE OF
PRODUCING STRONG GUSTY WINDS AND SMALL HAIL...WHILE A FEW OF THE
STORMS MAY PRODUCE DAMAGING WINDS AND LARGE HAIL. THE BEST CHANCES
FOR STORMS THIS AFTERNOON WILL BE GENERALLY EAST OF A LINE FROM THE
BANKHEAD NATIONAL FOREST...TO DECATUR...HUNTSVILLE...AND WINCHESTER.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

ISOLATED TO SCATTERED THUNDERSTORMS ARE POSSIBLE EACH DAY THROUGH
THE PERIOD. THE BEST CHANCES FOR THUNDERSTORM ACTIVITY WILL OCCUR ON
WEDNESDAY AND THURSDAY. HEAVY RAINFALL...GUSTY WINDS...AND HAIL ARE
POSSIBLE WITH ANY THUNDERSTORMS THAT DEVELOP.

.SPOTTER CALL TO ACTION STATEMENT...

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

KDW

In the hours before

Special weather statement, Jun 11, 12:54 PM CDT, 1 hour 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1254 PM CDT SAT JUN 11 2011

ALZ010-111845-
DE KALB-
1254 PM CDT SAT JUN 11 2011

...SIGNIFICANT WEATHER ADVISORY FOR DEKALB COUNTY UNTIL 145 PM CDT...

AT 1252 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM NEAR SYLVANIA...OR 8 MILES NORTHEAST OF
RAINSVILLE...MOVING SOUTHEAST AT 5 MPH.

PENNY SIZE HAIL...WINDS UP TO 50 MPH...FREQUENT CLOUD TO GROUND
LIGHTNING...AND HEAVY DOWNPOURS ARE EXPECTED WITH THIS STORM.

* LOCATIONS IN OR NEAR THE PATH INCLUDE...
  HAMMONDVILLE.
  VALLEY HEAD...FORT PAYNE.

REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO THE
STORM TO BE STRUCK BY LIGHTNING. SEEK SAFE SHELTER IMMEDIATELY.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

&&

LAT...LON 3449 8554 3449 8556 3446 8558 3444 8558
      3438 8562 3437 8563 3437 8565 3433 8569
      3457 8588 3463 8578 3470 8572 3453 8550
TIME...MOT...LOC 1754Z 320DEG 4KT 3457 8574

CA

Special weather statement, Jun 11, 1:26 PM CDT, 1 hour 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
126 PM CDT SAT JUN 11 2011

ALZ009-111900-
JACKSON-
126 PM CDT SAT JUN 11 2011

...SIGNIFICANT WEATHER ADVISORY FOR JACKSON COUNTY UNTIL 200 PM
CDT...

AT 120 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR BRIDGEPORT...MOVING SOUTH AT 5 MPH.

PENNY SIZE HAIL...WINDS UP TO 50 MPH...FREQUENT CLOUD TO GROUND
LIGHTNING...AND HEAVY DOWNPOURS ARE EXPECTED WITH THIS STORM.

* LOCATIONS IN OR NEAR THE PATH INCLUDE...
  HIGDON...FABIUS.

REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO THE
STORM TO BE STRUCK BY LIGHTNING. SEEK SAFE SHELTER IMMEDIATELY.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

&&

LAT...LON 3485 8561 3481 8563 3479 8563 3479 8564
      3475 8581 3500 8586 3500 8562 3499 8561
      3494 8559 3487 8558
TIME...MOT...LOC 1826Z 344DEG 4KT 3495 8573

CA

Special weather statement, Jun 11, 2:05 PM CDT, 37 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
205 PM CDT SAT JUN 11 2011

ALZ010-111930-
DE KALB-
205 PM CDT SAT JUN 11 2011

...SIGNIFICANT WEATHER ADVISORY FOR DEKALB COUNTY UNTIL 230 PM CDT...

AT 203 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES WEST OF
MENLO TO COLLINSVILLE...OR ALONG A LINE EXTENDING FROM 9 MILES EAST
OF FORT PAYNE TO 14 MILES EAST OF BOAZ...MOVING EAST AT 5 MPH.

PENNY SIZE HAIL AND WINDS UP TO 50 MPH ARE EXPECTED WITH THESE
STORMS.

* LOCATIONS IN OR NEAR THE PATH INCLUDE...
  DOG TOWN.
  COLLINSVILLE.

REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO THE
STORM TO BE STRUCK BY LIGHTNING. SEEK SAFE SHELTER IMMEDIATELY.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

&&

LAT...LON 3452 8552 3449 8554 3449 8556 3444 8558
      3438 8562 3437 8565 3435 8566 3426 8577
      3426 8580 3424 8582 3424 8583 3420 8584
      3420 8608 3421 8609 3452 8559
TIME...MOT...LOC 1906Z 271DEG 4KT 3447 8557 3425 8591

CA

Special weather statement, Jun 11, 2:27 PM CDT, 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
227 PM CDT SAT JUN 11 2011

ALZ010-112000-
DE KALB-
227 PM CDT SAT JUN 11 2011

...SIGNIFICANT WEATHER ADVISORY FOR DEKALB COUNTY UNTIL 300 PM CDT...

AT 227 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR PEEKS CORNER...OR 8 MILES SOUTHWEST OF
RAINSVILLE...MOVING SOUTH AT 5 MPH.

PENNY SIZE HAIL...WINDS UP TO 50 MPH...FREQUENT CLOUD TO GROUND
LIGHTNING...AND HEAVY DOWNPOURS ARE EXPECTED WITH THIS STORM.

* LOCATIONS IN OR NEAR THE PATH INCLUDE...
  GERALDINE.
  PEEKS CORNER.
  SKIRUM...LEBANON.

REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO THE
STORM TO BE STRUCK BY LIGHTNING. SEEK SAFE SHELTER IMMEDIATELY.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

&&

LAT...LON 3436 8574 3424 8606 3439 8605 3450 8584
TIME...MOT...LOC 1927Z 338DEG 3KT 3440 8592

CA

Special weather statement, Jun 11, 2:30 PM CDT, 12 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
230 PM CDT SAT JUN 11 2011

ALZ010-112000-
DE KALB-
230 PM CDT SAT JUN 11 2011

...SIGNIFICANT WEATHER ADVISORY FOR DEKALB COUNTY UNTIL 300 PM CDT...

AT 229 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
CLUTER OF STRONG THUNDERSTORMS NEAR SAND ROCK...OR 10 MILES NORTHWEST
OF CENTRE...MOVING SOUTH AT 15 MPH.

PENNY SIZE HAIL...WINDS UP TO 50 MPH...FREQUENT CLOUD TO GROUND
LIGHTNING...AND HEAVY DOWNPOURS ARE EXPECTED WITH THESE STORMS.

REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO THE
STORM TO BE STRUCK BY LIGHTNING. SEEK SAFE SHELTER IMMEDIATELY.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

&&

LAT...LON 3426 8577 3426 8580 3424 8582 3424 8583
      3421 8584 3420 8584 3420 8598 3423 8600
      3424 8599 3441 8569 3434 8567
TIME...MOT...LOC 1929Z 340DEG 14KT 3423 8582

CA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 7:54 PM CDT	Special Weather Statement	HUN	Marshall	36 min
Jun 11, 12:54 PM CDT	Special Weather Statement	HUN	DeKalb	51 min
Jun 11, 1:08 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb	37 min
Jun 11, 1:37 PM CDT	Severe Thunderstorm Warning	HUN	Jackson	38 min
Jun 11, 2:05 PM CDT	Special Weather Statement	HUN	DeKalb	25 min
Jun 11, 2:27 PM CDT	Special Weather Statement	HUN	DeKalb	33 min
Jun 11, 2:30 PM CDT	Special Weather Statement	HUN	DeKalb	30 min
Jun 11, 3:28 PM CDT	Flash Flood Warning	HUN	DeKalb	66 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.