Alert archive / Florida / Special Weather Statements in 2018

Special Weather Statement, NWS Jacksonville, FL

March 20, 2018Gilchrist County, Florida

NWS Jacksonville, FL issued this special weather statement at Mar 20, 2018, 12:39 PM EDT for Gilchrist County, Florida. It was in force for 51 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
Mar 20, 2018, 12:39 PM EDT (16:39 UTC)
Expired
Mar 20, 2018, 1:30 PM EDT
In force
51 min
Issued by
NWS Jacksonville, FL

County Gilchrist County, FL

The radar

The Moody AFB radar (KVAX), 120 km from the middle of the area, began a volume at 16:41 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

Jacksonville, FL (KJAX), launched 12:00Z, 4.7 hours before the alert went out and 136 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, Jacksonville, FL at 12:00Z on 2018-03-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1315 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, Jacksonville, FL at 12:00Z on 2018-03-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 257 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
1315 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
494 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
257 m²/s²
0-3 km storm-relative helicity
271 m²/s²
Significant tornado parameter
2.1
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 Jacksonville, FL wrote its last area forecast discussion before this special weather statement went out at Mar 20, 10:43 AM EDT, 1 hour 56 minutes earlier.

Area forecast discussion, Mar 20, 10:43 AM EDT, 1 hour 56 minutes before
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In the hours before

Special weather statement, Mar 20, 10:04 AM EDT, 2 hours 35 minutes before
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Special weather statement, Mar 20, 11:05 AM EDT, 1 hour 34 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
1105 AM EDT TUE MAR 20 2018

FLZ021>023-030-035-201545-
Columbia FL-Baker FL-Union FL-Suwannee FL-Gilchrist FL-
1105 AM EDT TUE MAR 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL GILCHRIST...
SOUTHERN BAKER...NORTHWESTERN UNION...SOUTHERN COLUMBIA AND
SOUTHEASTERN SUWANNEE COUNTIES UNTIL 1145 AM EDT...

At 1105 AM EDT, Doppler radar was tracking a strong thunderstorm near
Ichetucknee Spring, moving northeast at 70 mph.

Wind gusts of 45 to 55 mph can be expected along with possible minor
damage. Doppler radar has indicated weak rotation within this storm.
Tornadoes may develop with little or no advanced warning.

Locations impacted include...
Lake City, Ichetucknee Spring, Columbia, Macclenny, Glen St. Mary,
Palestine Community, Watertown, Lulu, Olustee and Sanderson.

LAT...LON 3043 8221 3038 8219 3038 8218 3036 8216
      3037 8213 3037 8210 3036 8209 3036 8205
      3022 8205 2990 8283 3006 8293
TIME...MOT...LOC 1505Z 242DEG 60KT 3003 8280

HESS
Special weather statement, Mar 20, 12:18 PM EDT, 21 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
1218 PM EDT TUE MAR 20 2018

FLZ022>025-030-GAZ164-201700-
Columbia FL-Inland Duval FL-Baker FL-Union FL-Inland Nassau FL-
Charlton GA-
1218 PM EDT TUE MAR 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN NASSAU...SOUTHERN
BAKER...NORTHERN UNION...EAST CENTRAL COLUMBIA...SOUTHWESTERN DUVAL
AND SOUTH CENTRAL CHARLTON COUNTIES UNTIL 100 PM EDT...

At 1218 PM EDT, Doppler radar was tracking a strong thunderstorm over
Olustee, or 11 miles northwest of Lake Butler, moving northeast at 50
mph.

Wind gusts of 45 to 55 mph can be expected along with possible minor
damage. Doppler radar has indicated weak rotation within this storm.
Tornadoes may develop with little or no advanced warning.

Locations impacted include...
Macclenny, Glen St. Mary, Palestine Community, Maxville, Lulu,
Olustee, Sanderson, Bryceville, Baldwin and Whitehouse Air Field.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3018 8200 3019 8205 3017 8205 3004 8247
      3020 8256 3054 8195 3024 8182
TIME...MOT...LOC 1618Z 244DEG 42KT 3017 8241

HESS
Special weather statement, Mar 20, 12:32 PM EDT, 7 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
1232 PM EDT TUE MAR 20 2018

FLZ031-032-036-201715-
Alachua FL-Bradford FL-Clay FL-
1232 PM EDT TUE MAR 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL ALACHUA...SOUTHERN
BRADFORD AND SOUTHWESTERN CLAY COUNTIES UNTIL 115 PM EDT...

At 1232 PM EDT, Doppler radar was tracking a strong thunderstorm near
Alachua, or 9 miles west of Gainesville, moving northeast at 45 mph.

Wind gusts of 45 to 55 mph can be expected along with possible minor
damage. Doppler radar has indicated weak rotation within this storm.
Tornadoes may develop with little or no advanced warning.

Locations impacted include...
Gainesville, Starke, Keystone Heights, Alachua, University Of
Florida, Camp Blanding, Kingsley, Sampson, Gainesville Airport and
Lake Geneva.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 2957 8251 2973 8261 3009 8197 2985 8182
TIME...MOT...LOC 1632Z 241DEG 39KT 2969 8249

HESS
Special weather statement, Mar 20, 12:39 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
1239 PM EDT TUE MAR 20 2018

FLZ021-022-030-035-036-201730-
Columbia FL-Union FL-Suwannee FL-Alachua FL-Gilchrist FL-
1239 PM EDT TUE MAR 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN GILCHRIST...NORTHWESTERN
ALACHUA...SOUTHWESTERN UNION...SOUTHERN COLUMBIA AND SOUTHEASTERN
SUWANNEE COUNTIES UNTIL 130 PM EDT...

At 1239 PM EDT, Doppler radar was tracking a strong thunderstorm 10
miles west of Bell, moving northeast at 45 mph.

Nickel size hail and wind gusts of 45 to 55 mph can be expected along
with possible minor damage.

Locations impacted include...
Bell, Worthington Spring, Ichetucknee Spring, High Springs, Fort
White, Worthington Springs, Upland Pines, Providence, La Crosse and
Hildreth.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 2972 8294 2973 8295 2974 8294 2977 8295
      2980 8292 2981 8293 2983 8292 2983 8289
      2988 8287 2990 8290 2989 8292 2995 8292
      3013 8251 2984 8238 2970 8296 2971 8295
      2972 8296
TIME...MOT...LOC 1639Z 246DEG 41KT 2979 8303

HESS

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 20, 3:21 AM EDTWind AdvisoryJAXBaker, Bradford, Duval, Flagler, Gilchrist, Nassau and 2 more11 hr
Mar 20, 3:28 AM EDTGale WarningJAX48 hr
Mar 20, 3:28 AM EDTSmall Craft AdvisoryJAX33 hr
Mar 20, 10:04 AM EDTSpecial Weather StatementJAXFlagler41 min
Mar 20, 11:05 AM EDTSpecial Weather StatementJAXBaker40 min
Mar 20, 12:18 PM EDTSpecial Weather StatementJAXBaker42 min
Mar 20, 12:32 PM EDTSpecial Weather StatementJAXAlachua, Bradford43 min
Mar 20, 12:34 PM EDTSpecial Marine WarningJAX56 min
Mar 20, 12:50 PM EDTSpecial Marine WarningJAX55 min
Mar 20, 1:11 PM EDTSpecial Weather StatementJAXBradford, Clay, Duval49 min
Mar 20, 1:14 PM EDTSpecial Marine WarningJAX91 min
Mar 20, 1:17 PM EDTSpecial Weather StatementJAXColumbia, Suwannee43 min
Mar 20, 1:20 PM EDTSevere Thunderstorm WarningJAXBradford, Clay, Duval, Saint Johns40 min
Mar 20, 1:26 PM EDTSevere Thunderstorm WarningJAXMarion49 min
Mar 20, 1:29 PM EDTSevere Thunderstorm WarningJAXAlachua, Gilchrist, Marion46 min
Mar 20, 1:51 PM EDTSevere Thunderstorm WarningJAXAlachua, Bradford, Union39 min
Mar 20, 2:15 PM EDTSpecial Weather StatementJAXGilchrist45 min
Mar 20, 2:17 PM EDTSpecial Weather StatementJAXBaker, Columbia, Nassau43 min
Mar 20, 2:19 PM EDTSpecial Marine WarningJAX86 min
Mar 20, 2:23 PM EDTSevere Thunderstorm WarningJAXAlachua, Baker, Bradford, Columbia, Gilchrist, Suwannee and 1 more52 min
Mar 20, 2:26 PM EDTSevere Thunderstorm WarningJAXBaker, Nassau34 min
Mar 20, 2:28 PM EDTSpecial Weather StatementJAXMarion32 min
Mar 20, 2:57 PM EDTSevere Thunderstorm WarningJAXBaker, Duval, Nassau48 min
Mar 20, 3:18 PM EDTSpecial Weather StatementJAXBradford, Clay, Union42 min
Mar 20, 3:32 PM EDTSpecial Marine WarningJAX58 min
Mar 20, 3:35 PM EDTSpecial Weather StatementJAXMarion, Putnam40 min
Mar 20, 3:38 PM EDTSpecial Weather StatementJAXNassau22 min
Mar 20, 4:11 PM EDTSpecial Weather StatementJAXFlagler, Marion, Putnam64 min
Mar 20, 4:35 PM EDTSpecial Marine WarningJAX85 min
Mar 20, 4:40 PM EDTSevere Thunderstorm WarningJAXFlagler, Saint Johns23 min
Mar 20, 5:57 PM EDTSpecial Marine WarningJAX63 min
Mar 19, 8:22 PM EDTSpecial Weather StatementJAXWayne38 min
Mar 20, 1:28 PM EDTSpecial Weather StatementJAXAtkinson47 min
Mar 20, 1:47 PM EDTSevere Thunderstorm WarningJAXAtkinson, Bacon, Brantley, Coffee, Pierce, Ware43 min
Mar 20, 2:13 PM EDTSevere Thunderstorm WarningJAXAppling, Bacon, Pierce, Ware, Wayne47 min
Mar 20, 2:49 PM EDTTornado WarningJAXWayne26 min
Mar 20, 2:59 PM EDTSpecial Weather StatementJAXCamden46 min
Mar 20, 3:16 PM EDTSpecial Weather StatementJAXWayne29 min
Mar 20, 3:41 PM EDTSpecial Weather StatementJAXGlynn19 min
Mar 20, 4:34 PM EDTSpecial Weather StatementJAXWayne26 min
Mar 20, 5:07 PM EDTSpecial Weather StatementJAXBrantley38 min
Mar 20, 5:28 PM EDTSevere Thunderstorm WarningJAXBrantley, Glynn, Wayne32 min
Mar 20, 5:59 PM EDTSpecial Weather StatementJAXGlynn46 min

Nearby

Special Weather Statements in Florida, 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.