Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 251, NWS Jacksonville, FL

December 3, 20184 counties in Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Dec 3, 2018, 9:21 AM EST for 4 counties in Florida. It was in force for 39 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
Dec 3, 2018, 9:21 AM EST (14:21 UTC)
Expired
Dec 3, 2018, 10:00 AM EST
In force
39 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Baker County, FL, Bradford County, FL, Clay County, FL, Duval County, FL

The radar

The Jacksonville radar (KJAX), 46 km from the middle of the area, began a volume at 14:23 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 2.4 hours before the alert went out and 224 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, Tallahassee Rgnl, FL at 12:00Z on 2018-12-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 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, Tallahassee Rgnl, FL at 12:00Z on 2018-12-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -23 square meters per square second.1939587897Sfc1 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
2 J/kg
Mixed-layer CIN
-131 J/kg
Mixed-layer LCL
573 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
-23 m²/s²
0-3 km storm-relative helicity
97 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 Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Dec 3, 9:04 AM EST, 17 minutes earlier.

Area forecast discussion, Dec 3, 9:04 AM EST, 17 minutes before
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In the hours before

Special weather statement, Dec 3, 6:39 AM EST, 2 hours 42 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
639 AM EST MON DEC 3 2018

FLZ021>023-030-031245-
Columbia FL-Baker FL-Union FL-Suwannee FL-
639 AM EST MON DEC 3 2018

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN BAKER...NORTHWESTERN
UNION...CENTRAL COLUMBIA AND SOUTHEASTERN SUWANNEE COUNTIES UNTIL 745
AM EST...

* At 639 AM EST, National Weather Service meteorologists were
  tracking strong thunderstorms along a line extending from near
  Watertown to 10 miles north of Steinhatchee. Movement was northeast
  at 45 mph.

* Winds in excess of 45 mph possible with these storms.

* Locations impacted include...
  Lake City, Ichetucknee Spring, Columbia, Taylor, Palestine
  Community, Winfield, Olustee, Mcalpin, Five Points and Watertown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Funnel clouds occasionally touch down and produce tornadoes or
waterspouts. Move indoors and stay away from windows.

To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Jacksonville on
Facebook and Twitter.

&&

LAT...LON 3051 8222 3050 8221 3013 8223 2992 8277
      2994 8279 2993 8281 2991 8283 2991 8286
      2988 8288 2990 8290 2989 8292 2995 8292
      2996 8293 2996 8295 2999 8296 3001 8298
      3001 8300 3003 8301 3008 8307 3009 8310
TIME...MOT...LOC 1139Z 239DEG 37KT 3018 8253 2982 8338

ENYEDI
Special weather statement, Dec 3, 7:46 AM EST, 1 hour 35 minutes before
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Special weather statement, Dec 3, 7:56 AM EST, 1 hour 25 minutes before
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Special weather statement, Dec 3, 8:32 AM EST, 49 minutes before
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Special weather statement, Dec 3, 8:42 AM EST, 39 minutes before
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Special weather statement, Dec 3, 9:11 AM EST, 10 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Dec 3, 3:47 AM ESTSevere Thunderstorm WarningJAXHamilton28 min
Dec 3, 5:39 AM ESTSpecial Weather StatementJAXSuwannee36 min
Dec 3, 5:46 AM ESTTornado WarningJAXColumbia, Suwannee29 min
Dec 3, 6:12 AM ESTSevere Thunderstorm WarningJAXColumbia, Suwannee33 min
Dec 3, 6:17 AM ESTSpecial Marine WarningJAX58 min
Dec 3, 6:39 AM ESTSpecial Weather StatementJAXBaker, Columbia66 min
Dec 3, 6:58 AM ESTTornado WarningJAXColumbia, Suwannee17 min
Dec 3, 7:00 AM ESTSevere Thunderstorm WarningJAXBaker, Columbia30 min
Dec 3, 7:09 AM ESTSpecial Marine WarningJAX66 min
Dec 3, 7:24 AM ESTSevere Thunderstorm WarningJAXColumbia, Gilchrist, Suwannee51 min
Dec 3, 7:46 AM ESTSpecial Weather StatementJAXUnion44 min
Dec 3, 7:56 AM ESTSpecial Weather StatementJAXBaker49 min
Dec 3, 8:14 AM ESTSpecial Marine WarningJAX30 min
Dec 3, 8:32 AM ESTSpecial Weather StatementJAXNassau43 min
Dec 3, 8:42 AM ESTSpecial Weather StatementJAXBaker, Clay, Union48 min
Dec 3, 8:58 AM ESTSevere Thunderstorm WarningJAXBaker, Bradford, Clay, Duval, Union47 min
Dec 3, 9:11 AM ESTSpecial Weather StatementJAXDuval34 min
Dec 3, 9:13 AM ESTSpecial Marine WarningJAX92 min
Dec 3, 9:39 AM ESTSevere Thunderstorm WarningJAXClay, Duval, Saint Johns52 min
Dec 3, 9:47 AM ESTAreal Flood AdvisoryJAXClay, Duval88 min
Dec 3, 10:33 AM ESTSpecial Weather StatementJAXBradford42 min
Dec 3, 10:37 AM ESTSpecial Marine WarningJAX53 min
Dec 3, 10:55 AM ESTSpecial Weather StatementJAXDuval35 min
Dec 3, 11:10 AM ESTAreal Flood WarningJAXClay, Duval, Saint Johns110 min
Dec 3, 11:17 AM ESTSpecial Weather StatementJAXDuval13 min
Dec 3, 11:32 AM ESTSpecial Marine WarningJAX58 min
Dec 3, 11:55 AM ESTSpecial Weather StatementJAXMarion20 min
Dec 3, 11:56 AM ESTSpecial Weather StatementJAXMarion34 min
Dec 3, 12:17 PM ESTSpecial Weather StatementJAXFlagler28 min
Dec 3, 4:57 PM ESTSpecial Weather StatementJAXClay33 min
Dec 3, 5:26 PM ESTSpecial Weather StatementJAXDuval34 min
Dec 2, 7:47 PM ESTAreal Flood WarningJAXCharlton, Clinch, Echols, Ware6 hr
Dec 2, 8:14 PM ESTSpecial Weather StatementJAXBrantley31 min
Dec 2, 9:05 PM ESTAreal Flood AdvisoryJAXBrantley, Glynn, Pierce, Wayne115 min
Dec 2, 9:05 PM ESTRiver Flood WarningJAXEchols18 days
Dec 3, 1:47 AM ESTAreal Flood WarningJAXAtkinson, Bacon, Brantley, Clinch, Echols, Pierce and 1 more118 min
Dec 3, 3:11 AM ESTTornado WarningJAXClinch, Echols34 min
Dec 3, 4:10 AM ESTSpecial Weather StatementJAXClinch50 min
Dec 3, 5:29 AM ESTSpecial Weather StatementJAXCharlton31 min
Dec 3, 5:43 AM ESTSpecial Weather StatementJAXBrantley32 min
Dec 3, 5:57 AM ESTSevere Thunderstorm WarningJAXBrantley, Camden, Glynn33 min
Dec 3, 6:04 AM ESTSpecial Weather StatementJAXCharlton26 min
Dec 3, 6:16 AM ESTTornado WarningJAXCamden, Glynn29 min
Dec 3, 6:29 AM ESTSevere Thunderstorm WarningJAXCamden, Charlton, Glynn46 min
Dec 3, 6:45 AM ESTSevere Thunderstorm WarningJAXGlynn15 min
Dec 3, 7:13 AM ESTTornado WarningJAXCamden, Glynn22 min
Dec 3, 11:22 AM ESTRiver Flood WarningJAXBrantley47 days

Nearby

Severe Thunderstorm Warnings in Florida, 2018Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.