Alert archive / Alabama / Special Weather Statements in 2018

Special Weather Statement, NWS Birmingham, AL

July 21, 2018Macon County, Alabama

NWS Birmingham, AL issued this special weather statement at Jul 21, 2018, 11:33 PM CDT for Macon County, Alabama. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 21, 2018, 11:33 PM CDT (04:33 UTC)
Expired
Jul 22, 2018, 12:15 AM CDT
In force
42 min
Issued by
NWS Birmingham, AL

County Macon County, AL

The radar

The Maxwell AFB radar (KMXX), 5 km from the middle of the area, began a volume at 04:35 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, 4.6 hours before the alert went out and 121 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 2018-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2210 joules per kilogram.LCLEL10008507005003002001001 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 2018-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 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
2210 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1459 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
169 m²/s²
Significant tornado parameter
0.7
Supercell composite
8.3

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 21, 6:53 PM CDT, 4 hours 40 minutes earlier.

Area forecast discussion, Jul 21, 6:53 PM CDT, 4 hours 40 minutes before
Area Forecast Discussion
National Weather Service Birmingham AL
653 PM CDT Sat Jul 21 2018

.UPDATE...
For 00Z Aviation.

&&

Near Term...
Through Early Evening.

A couple storms have developed over the last hour across east
Alabama, and seeing a more developed cu field across portions of the
northeast. Expect this to be the primary area of development. The
mesoscale discussion issued earlier today remains valid (below).
Although storm coverage will be low, any storm that develops could
be strong to severe through early evening.

14

.LONG TERM...
Sunday through Friday.

The cold front will slowly slide southward through the area on
Sunday and should be near the I-85 corridor by sunset. Look for
the front to actually clear the area by Sunday night, but then we
shift our attention to the north and the path of the upper low.
Models have come into a little bit more of a consensus on the path
of the upper low swinging through northern GA and into Central AL
on Monday and then setting up shop for several days. This scenario
would place the highest rain chances in the eastern half each
afternoon through Wednesday. By Thursday the upper low opens up
and begins to elongate across the Southeast, before the energy
slides east ahead of the next front that will likely hold of until
the beginning of next week. Highest rain chances for Friday and
Saturday will be across the north, while the southern areas could
dry out some. Temperatures will be in the upper 80s with the cloud
cover through midweek and then rise back into the low 90s by the
weekend.

&&

.AVIATION...
00Z TAF Discussion.

Outside thunderstorms, VFR conds expected thru the period. Isolated
TSRA across east Alabama thru 03z could impact KMGM and KTOI between
02z and 06z, and handled with VCTS. West to southwest winds 8-12
knots thru 02z will diminish to 3-6 knots overnight. Sfc winds
will increase and become west northwest after 15z as the surface
trof pushes south of the area. Isolated TSRA will develop after
17z across northeast Alabama, possibly impacting KANB and KASN.

58/rose

&&

.FIRE WEATHER...

Isolated to scattered showers/storms are possible through tonight as
a front moves slowly through the area. Tomorrow through early next
week, an upper low will move over the region, leading to higher rain
chances, especially across the east. This will also bring slightly
cooler temperatures. Localized fog will be possible each morning
over the next couple of days where rainfall occurs during the
previous afternoon and evening. There are no fire weather concerns.

&&

.PRELIMINARY POINT TEMPS/POPS...
Gadsden     71  88  68  85  68 /  20  50  30  60  20
Anniston    71  88  68  85  68 /  20  30  30  60  30
Birmingham  75  90  71  87  70 /  10  20  20  50  10
Tuscaloosa  74  92  72  89  71 /  10  10  10  30  10
Calera      73  90  70  87  69 /  20  20  10  40  10
Auburn      74  89  70  86  70 /  50  30  30  60  30
Montgomery  74  93  72  90  70 /  30  30  10  50  20
Troy        75  92  72  89  70 /  30  30  20  50  20

&&

.BMX WATCHES/WARNINGS/ADVISORIES/...
None.

&&
Hazardous weather outlook, Jul 21, 11:27 PM CDT, 6 minutes before
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In the hours before

Special weather statement, Jul 21, 10:02 PM CDT, 1 hour 31 minutes before
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Special weather statement, Jul 21, 10:09 PM CDT, 1 hour 24 minutes before
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Special weather statement, Jul 21, 10:20 PM CDT, 1 hour 13 minutes before
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Special weather statement, Jul 21, 10:57 PM CDT, 36 minutes before
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Special weather statement, Jul 21, 10:58 PM CDT, 35 minutes before
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Special weather statement, Jul 21, 11:33 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 8:56 PM CDTSpecial Weather StatementBMXTalladega34 min
Jul 21, 9:08 PM CDTSevere Thunderstorm WarningBMXClay, Talladega37 min
Jul 21, 9:18 PM CDTSevere Thunderstorm WarningBMXCoosa, Tallapoosa27 min
Jul 21, 9:34 PM CDTSpecial Weather StatementBMXClay26 min
Jul 21, 9:42 PM CDTSevere Thunderstorm WarningBMXCoosa, Tallapoosa33 min
Jul 21, 9:51 PM CDTSpecial Weather StatementBMXShelby24 min
Jul 21, 9:57 PM CDTSpecial Weather StatementBMXRandolph33 min
Jul 21, 10:02 PM CDTSpecial Weather StatementBMXShelby28 min
Jul 21, 10:09 PM CDTSpecial Weather StatementBMXTallapoosa36 min
Jul 21, 10:20 PM CDTSpecial Weather StatementBMXCoosa25 min
Jul 21, 10:57 PM CDTSpecial Weather StatementBMXTallapoosa48 min
Jul 21, 10:58 PM CDTSpecial Weather StatementBMXTallapoosa47 min
Jul 21, 11:57 PM CDTSpecial Weather StatementBMXRussell48 min
Jul 22, 11:22 AM CDTSevere Thunderstorm WarningBMXMarengo23 min
Jul 22, 11:29 AM CDTSpecial Weather StatementBMXMarengo16 min
Jul 22, 11:38 AM CDTSevere Thunderstorm WarningBMXMarengo22 min
Jul 22, 12:28 PM CDTSpecial Weather StatementBMXLowndes47 min
Jul 22, 12:45 PM CDTSevere Thunderstorm WarningBMXLowndes30 min
Jul 22, 1:05 PM CDTSevere Thunderstorm WarningBMXLowndes, Montgomery40 min
Jul 22, 2:07 PM CDTSpecial Weather StatementBMXRussell53 min

Nearby

Special Weather Statements in Alabama, 2018Every special weather statement in 2018

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.