Alert archive / Alabama / Wind Advisories in 2009

Wind Advisory 6, NWS Huntsville, AL

April 12, 20097 counties in Alabama

NWS Huntsville, AL issued this wind advisory at Apr 12, 2009, 10:32 PM CDT for 7 counties in Alabama. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Apr 12, 2009, 10:32 PM CDT (03:32 UTC)
Expired
Apr 13, 2009, 12:33 AM CDT
In force
2 hr
Issued by
NWS Huntsville, AL

Counties Colbert County, AL, Cullman County, AL, Franklin County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Morgan County, AL

The radar

The Columbus AFB radar (KGWX), 118 km from the middle of the area, began a volume at 03:32 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 00:00Z, 3.5 hours before the alert went out and 162 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-pSkew-T log-p diagram, Birmingham, AL at 00:00Z on 2009-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 2009-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1755 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
406 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 wind advisory 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 wind advisory went out at Apr 12, 7:15 PM CDT, 3 hours 17 minutes earlier.

Area forecast discussion, Apr 12, 7:15 PM CDT, 3 hours 17 minutes before
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
715 PM CDT SUN APR 12 2009

.UPDATE...
UPDATED FOR 00Z TAFS.

&&

.AVIATION...
-SHRA/SHRA WILL CONTINUE TO IMPACT N AL THIS EVENING AND OVERNIGHT
PERIOD. MVFR CIGS/VIS WILL BE POSSIBLE AT KMSL BTWN 00-04Z/KHSV BTWN
01-05. AFTER MIDNIGHT...MVFR VIS/CIGS WILL PREVAIL AT BOTH SITES DUE
TO THE DEVELOPMENT OF LOW STRATUS/FOG ALONG SOME LINGERING -SHRA. IN
ADDITION TO THE PRECIP THREATS...GUSTY WINDS (UP TO 25 KTS) WILL
ACCOMPANY THE SHOWERS AS WELL. A BREAK IN PRECIP IS EXPECTED 12-19Z
(THOUGH MVFR CIGS/VIS WILL CONTINUE)...BEFORE ANOTHER LINE OF
POSSIBLY STRONGER -SHRA DEVELOPS AHEAD OF A COLD FRONT AROUND
20-21Z. TSRA MAY BE POSSIBLE LATE IN THE PERIOD BUT HAVE NOT
INCLUDED AT THIS TIME DUE TO TIMING UNCERTAINTY.

&&

.DISCUSSION... /ISSUED 306 PM CDT SUN APR 12 2009/

MAIN FORECAST CONCERN FOR THIS PACKAGE FOCUSES ON THE NEXT 36
HOURS OR SO...AS AN APPROACHING UPPER LOW IS PROGGED TO IMPACT THE
TENNESSEE VALLEY TONIGHT THROUGH MONDAY EVENING.

CONVECTION ONGOING ACROSS THE MIDSOUTH/LOWER MISSISSIPPI WILL
CONTINUE TO MOVE EAST THROUGH THE REMAINDER OF THE
AFTERNOON...ARRIVING INTO NORTHWEST ALABAMA LATE THIS
AFTERNOON/EARLY EVENING. WHILE INSTABILITY REMAINS RATHER PALTRY
THROUGH THE OVERNIGHT HOURS...A STRONG LOW LEVEL JET /60-70KT/
PUNCHES ACROSS THE CWFA TONIGHT...AND A FEW STRONG STORMS CAPABLE OF
GUSTY WINDS ARE POSSIBLE THROUGH THE OVERNIGHT HOURS. COULD SEE A
FEW INSTANCES OF SMALL HAIL...BUT GUSTY WINDS LOOK TO BE THE PRIMARY
THREAT TONIGHT. ALONG WITH A MOISTURE TRANSPORT MAX/THETAE
RIDGE...SATURATED ASCENT /50-55KT/ ON THE I295K SURFACE BEGINS IN
EARNEST AFTER MIDNIGHT...SUGGESTING THE THREAT OF LOCALLY HEAVY
RAINFALL WITH TOTALS TONIGHT ANYWHERE BETWEEN 1-2 INCHES. OUTSIDE OF
ANY THUNDERSTORM...WINDS WILL REMAIN GUSTY...AT TIMES GUSTING TO
AROUND 30 MPH.

ON MONDAY...THERE WILL BE SOMEWHAT OF A BREAK AFTER THE
SHOWER/THUNDERSTORM COMPLEX MOVES EAST DURING THE MORNING HOURS.
TEMPERATURES OVER THE WEST SHOULD BE ABLE TO RECOVER INTO THE
LOW/MID 70S AHEAD OF THE MAIN COLD FRONT. COULD SEE SOME ISOLATED
THUNDERSTORMS WELL AHEAD OF THE MAIN LINE...BUT THE BULK OF THE
STRONG TO SEVERE THUNDERSTORM THREAT SHOULD BE JUST AHEAD OF THE
COLD FRONT...WHICH WILL ARRIVE INTO NW ALABAMA LATE IN THE
AFTERNOON...AND EXIT THE CWFA AROUND MIDNIGHT. CONSIDERABLY MORE
CAPE IS AVAILABLE MONDAY EVENING THAN TONIGHT...AND THE
CORRESPONDING SEVERE THREAT INCREASES....WITH DAMAGING
WINDS/HAIL/AND ISOLATED TORNADOES ALL POSSIBLE AS THE FRONT MOVES
THROUGH.

AS THE FRONT EXITS THE AREA MONDAY NIGHT...LINGERING WRAP AROUND
MOISTURE MAY LEAD TO ISOLATED SHOWERS THROUGH TUESDAY. HIGH
PRESSURE/UPPER RIDGING BUILD IN BY MID WEEK...AND CONTROL THE
FORECAST THROUGH THE END OF THE WORK WEEK. GFS/ECMWF BOTH SUGGEST AN
UPPER LOW TRAVERSING THE CONUS WILL BREAK DOWN THE RIDGE...BRINGING
SHOWERS AND THUNDERSTORMS INTO THE AREA BY SATURDAY AND PERSISTING
THROUGH THE START OF THE NEXT WORK WEEK.

&&

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

AVIATION...AMP.24
DISCUSSION...JLL.22
Hazardous weather outlook, Apr 12, 10:10 PM CDT, 22 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 13, 2:44 PM CDTSevere Thunderstorm WarningHUNLimestone31 min
Apr 13, 2:59 PM CDTTornado WarningHUNLimestone31 min
Apr 13, 3:15 PM CDTTornado WarningHUNMadison33 min
Apr 13, 6:11 PM CDTSevere Thunderstorm WarningHUNLawrence, Limestone32 min
Apr 13, 6:29 PM CDTSevere Thunderstorm WarningHUNMadison21 min
Apr 13, 3:03 PM CDTSevere Thunderstorm WarningHUNLincoln42 min
Apr 13, 3:31 PM CDTTornado WarningHUNLincoln29 min
Apr 13, 4:50 PM CDTSevere Thunderstorm WarningHUNFranklin25 min

Nearby

Wind Advisories in Alabama, 2009Every wind advisory in 2009

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.