Alert archive / Georgia / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 27, NWS Tallahassee, FL

April 15, 20186 counties in Georgia; Madison County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Apr 15, 2018, 9:37 AM EDT for 6 counties in Georgia; Madison County, Florida. It was in force for 38 min. 5 reports 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: Apr 15, 2018, 9:37 AM EDT (13:37 UTC)
Expired: Apr 15, 2018, 10:15 AM EDT
In force: 38 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Madison County, FL, Berrien County, GA, Brooks County, GA, Colquitt County, GA, Cook County, GA, Lanier County, GA, Lowndes County, GA

The radar

The Moody AFB radar (KVAX), 19 km from the middle of the area, began a volume at 13:37 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
Apr 15, 9:42 AM EDT	TSTM WND DMG	3 Ne Berlin, GA	2 TREES DOWN ALONG TILLMAN ROAD.
Apr 15, 9:50 AM EDT	TSTM WND DMG	2 Wnw Pine Valley, GA	2 TREES DOWN ON ANTIOCH ROAD.
Apr 15, 9:55 AM EDT	TSTM WND DMG	Adel, GA	TREE DOWN IN ADEL.
Apr 15, 10:00 AM EDT	TSTM WND DMG	1 Wnw Remerton, GA	TREES DOWN IN TROUPVILLE.
Apr 15, 10:15 AM EDT	TSTM WND DMG	2 Wnw Nashville, GA	TREE DOWN ON CHASERVILLE ROAD.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 5 storm reports to this severe thunderstorm warning; the first came 5 minutes after it went out.

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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 1.6 hours before the alert went out and 118 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: 442 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 768 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 355 m²/s²
0-3 km storm-relative helicity: 382 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

As transmitted.

777 
WUUS52 KTAE 151337
SVRTAE
FLC079-GAC019-027-071-075-173-185-151415-
/O.NEW.KTAE.SV.W.0027.180415T1337Z-180415T1415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tallahassee FL
937 AM EDT SUN APR 15 2018

The National Weather Service in Tallahassee has issued a

* Severe Thunderstorm Warning for...
  Madison County in Big Bend of Florida...
  Cook County in south central Georgia...
  Berrien County in south central Georgia...
  Lowndes County in south central Georgia...
  Lanier County in south central Georgia...
  Brooks County in south central Georgia...
  Eastern Colquitt County in south central Georgia...

* Until 1015 AM EDT.

* At 937 AM EDT, severe thunderstorms were located along a line
  extending from Norman Park to 6 miles southwest of Madison, moving
  east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Nashville, Adel, Valdosta, Madison, Lake Park, Lakeland, Quitman,
  Moultrie, Hahira, Sparks, Ray City, Norman Park, Lenox, Alapaha,
  I-75 At Exit 16, Moody Air Force Base, Remerton, Meigs, Dasher and
  Morven.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3085 8301 3085 8309 3080 8310 3080 8313
      3063 8314 3063 8329 3059 8326 3042 8322
      3039 8317 3033 8321 3033 8354 3131 8375
      3133 8346 3135 8344 3139 8312 3128 8304
      3119 8305 3118 8297 3087 8297
TIME...MOT...LOC 1337Z 262DEG 35KT 3128 8369 3041 8350 

HAIL...<.75IN
WIND...60MPH
 
$$

11-NGUYEN

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 Tallahassee, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 15, 9:22 AM EDT, 15 minutes earlier.

Area forecast discussion, Apr 15, 9:22 AM EDT, 15 minutes before

Area Forecast Discussion
National Weather Service Tallahassee FL
922 AM EDT Sun Apr 15 2018

...SEVERE WEATHER THREAT CONTINUES

.NEAR TERM [Through Today]...

Squall line continues to march steadily eastward across our
eastern zones. The primary threat will continue to be damaging
straight line winds and we have received several reports of
damage. However, a couple of tornadoes will be possible in and
even behind this line. The severe threat should be east of the
area by midday or shortly thereafter. Post-frontal clouds and
showers will linger into the afternoon before clearing occurs from
southwest to northeast.

&&

.PREV DISCUSSION [654 AM EDT]...

.SHORT TERM [Tonight Through Tuesday]...

Cold front will be east of the area as the short term begins.
Supporting trough will lift northeast leaving behind rising
heights with an upstream ridge over the southern Plains and
surface high pressure moving across the northern Gulf. The
atmospheric column dries out to under 0.50 inches which will lead
to dry conditions this period. Much cooler temperatures will
continue into Monday with highs in the upper 60s to around 70
degrees. As high pressure moves in, a warmup in anticipated
Tuesday with highs in the mid 70s.

.LONG TERM [Tuesday Night Through Sunday]...

High pressure will slide east into the Atlantic with the approach
of a weak cold front Thursday. Models do indicate a little more
moisture compared to 24 hours ago so introduced a slight chance
for a shower or two along the front. High pressure will quickly
build in for Friday but will be short lived with the approach of a
much stronger system. Increasing clouds expected Saturday with the
main system on approach for Sunday/Sunday night. Some timing
differences between the models but each do show a latter half of
the weekend storm system, increasing confidence for showers and
thunderstorms ahead of the next work week.

.AVIATION [Through 12Z Monday]...

A line of strong thunderstorms is moving through the region.
Mostly MVFR CIGs are expected this morning. Winds are strong today
with 25 to 30 mph gusts possible. VFR conditions will return late
this morning in western locations and this afternoon at VLD.

.MARINE...

Winds have increased ahead of a cold front which will move
through the coastal waters today. Strong to severe thunderstorms
are also possible ahead of the front. Small craft advisories are
in effect through Monday afternoon, at which time wind speeds
should slowly decrease. More favorable marine conditions are
expected beginning Tuesday.

.FIRE WEATHER...

Drier air will be in place this week after a cold front moves
through today. Minimum RH values are expected to remain above the
critical threshold for red flag conditions. High dispersion values
over 75 are possible this afternoon. A wetting rain is expected
today at all locations.

.HYDROLOGY...

One to two inches of rain, with isolated higher amounts, is
expected as the squall line moves through today. Based on these
values, a river point or two could reach action stage, however
river flooding isn't expected. Some ponding of water in low lying
areas could occur, but widespread flooding is not expected.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is requested. Spotters should safely report
significant weather conditions and/or damage by calling the office or
tweeting us @NWSTallahassee.

&&

.PRELIMINARY POINT TEMPS/POPS...

Tallahassee   71  43  69  45  76 / 100   0   0   0   0
Panama City   68  49  69  52  73 /  90   0   0   0   0
Dothan        68  41  66  44  76 / 100   0   0   0   0
Albany        70  43  65  44  75 / 100   0   0   0   0
Valdosta      72  44  65  44  74 / 100   0   0   0   0
Cross City    75  46  66  45  74 / 100   0   0   0   0
Apalachicola  71  48  68  49  72 / 100   0   0   0   0

&&

.TAE WATCHES/WARNINGS/ADVISORIES...
FL...High Rip Current Risk through late tonight for Coastal Bay-
     Coastal Franklin-Coastal Gulf-South Walton.

     High Surf Advisory until 8 AM EDT /7 AM CDT/ Monday for Coastal
     Bay-South Walton.

     High Surf Advisory until 11 AM EDT /10 AM CDT/ Monday for
     Coastal Gulf.

GA...None.
AL...None.
GM...Small Craft Advisory until 2 PM EDT Monday for Apalachee Bay or
     Coastal Waters From Keaton Beach to Ochlockonee River FL
     out to 20 Nm-Coastal Waters From Ochlockonee River to
     Apalachicola Fl out to 20 Nm-Coastal waters from Suwannee
     River to Keaton Beach FL out 20 NM-Coastal waters from
     Mexico Beach to Apalachicola FL out 20 NM-Coastal waters
     from Mexico Beach to Okaloosa Walton County Line FL out 20
     NM-Waters from Suwannee River to Apalachicola FL from 20 to
     60 NM-Waters from Apalachicola to Mexico Beach FL from 20
     to 60 NM-Waters from Mexico Beach to Okaloosa Walton County
     Line FL from 20 to 60 NM.

&&

NEAR TERM...Wool
SHORT TERM...Scholl
LONG TERM...Scholl
AVIATION...McD
MARINE...Scholl
FIRE WEATHER...McD
HYDROLOGY...Barry

In the hours before

Local storm report, Apr 15, 7:33 AM EDT, 2 hours 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
733 AM EDT SUN APR 15 2018

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

0712 AM     TSTM WND DMG     4 WSW ALLANTON          30.01N 85.52W
04/15/2018                   BAY                FL   TRAINED SPOTTER

            TWO TO THREE TREES DOWN ALONG HIGHWAY 98
            NEAR MILE MARKER 133. TREES FELL ON POWER
            LINES, RESULTING IN DOWNED POWER LINES TOO.

&&

JLF

Local storm report, Apr 15, 7:45 AM EDT, 1 hour 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
745 AM EDT SUN APR 15 2018

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

0712 AM     TSTM WND DMG     4 WSW ALLANTON          30.01N 85.52W
04/15/2018                   BAY                FL   TRAINED SPOTTER

            TWO TO THREE TREES DOWN ALONG HIGHWAY 98
            NEAR MILE MARKER 133. TREES FELL ON POWER
            LINES, RESULTING IN DOWNED POWER LINES TOO.
            POSSIBLE TORNADO.

&&

JLF

Local storm report, Apr 15, 8:02 AM EDT, 1 hour 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
802 AM EDT SUN APR 15 2018

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

0655 AM     TSTM WND GST     APALACHICOLA MUNICIPAL  29.73N 85.02W
04/15/2018  M54 MPH          FRANKLIN           FL   ASOS

            ASOS STATION AAF, APALACHICOLA MUNICIPAL
            AIRPORT REPORTED A PEAK GUST OF 54 MPH.

&&

JLF

Local storm report, Apr 15, 9:06 AM EDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
906 AM EDT SUN APR 15 2018

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

0757 AM     TSTM WND DMG     BLOUNTSTOWN             30.45N 85.05W
04/15/2018                   CALHOUN            FL   911 CALL CENTER

            TREE DOWN ON FUQUA CIRCLE.

&&

JLF

Local storm report, Apr 15, 9:08 AM EDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
908 AM EDT SUN APR 15 2018

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

0758 AM     TSTM WND DMG     2 NE NETTLE RIDGE       30.49N 85.02W
04/15/2018                   CALHOUN            FL   911 CALL CENTER

            TREE DOWN ON PARISH LAKE ROAD.

&&

JLF

Local storm report, Apr 15, 9:12 AM EDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
912 AM EDT SUN APR 15 2018

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

0855 AM     TSTM WND GST     DECATUR CO A/P          30.97N 84.64W
04/15/2018  M54 MPH          DECATUR            GA   ASOS

            REPORTED AT KBGE.

&&

DH

The office that day

Everything else NWS Tallahassee, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 15, 8:16 AM EDT	Severe Thunderstorm Warning	TAE	Decatur, Grady, Thomas	44 min
Apr 15, 8:28 AM EDT	Tornado Warning	TAE	Baker, Decatur, Miller, Seminole	32 min
Apr 15, 8:48 AM EDT	Severe Thunderstorm Warning	TAE	Brooks, Colquitt, Grady, Thomas	27 min
Apr 15, 8:55 AM EDT	Tornado Warning	TAE	Baker, Decatur, Miller, Mitchell	35 min
Apr 15, 9:11 AM EDT	Severe Thunderstorm Warning	TAE	Brooks, Colquitt, Thomas	49 min
Apr 15, 10:03 AM EDT	Severe Thunderstorm Warning	TAE	Ben Hill, Berrien, Irwin, Tift, Turner	42 min
Apr 15, 10:11 AM EDT	Severe Thunderstorm Warning	TAE	Berrien, Cook, Lanier, Lowndes	34 min
Apr 15, 2:44 AM EDT	Special Marine Warning	TAE		2 hr
Apr 15, 3:28 AM EDT	Severe Thunderstorm Warning	TAE	Bay, Holmes, Walton, Washington	48 min
Apr 15, 4:38 AM EDT	Special Marine Warning	TAE		2 hr
Apr 15, 6:32 AM EDT	Special Marine Warning	TAE		88 min
Apr 15, 7:09 AM EDT	Tornado Warning	TAE	Bay, Calhoun, Gulf	36 min
Apr 15, 7:29 AM EDT	Special Marine Warning	TAE		2 hr
Apr 15, 8:34 AM EDT	Severe Thunderstorm Warning	TAE	Jefferson, Leon, Madison, Taylor, Wakulla	41 min
Apr 15, 8:37 AM EDT	Special Marine Warning	TAE		113 min
Apr 15, 10:21 AM EDT	Special Marine Warning	TAE		24 min
Apr 15, 10:55 AM EDT	Special Marine Warning	TAE		65 min
Apr 15, 10:58 AM EDT	Severe Thunderstorm Warning	TAE	Dixie, Lafayette	47 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2018 Severe Thunderstorm Warnings in Florida, 2018 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.