Alert archive / Florida / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 144, NWS Jacksonville, FL

May 24, 2017Clay County, Duval County, Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at May 24, 2017, 11:37 AM EDT for Clay County, Duval County, Saint Johns County, Florida. It was in force for 38 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: May 24, 2017, 11:37 AM EDT (15:37 UTC)
Expired: May 24, 2017, 12:15 PM EDT
In force: 38 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Clay County, FL, Duval County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 46 km from the middle of the area, began a volume at 15:38 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 24, 6:56 AM EDT	Tornado Watch	SPC	8 hr
May 24, 11:03 AM EDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 3.6 hours before the alert went out and 47 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: 868 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 752 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 9.7

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 May 24, 9:39 AM EDT, 1 hour 58 minutes earlier.

Area forecast discussion, May 24, 9:39 AM EDT, 1 hour 58 minutes before

Area Forecast Discussion
National Weather Service Jacksonville FL
939 AM EDT Wed May 24 2017

...SEVERE STORMS TODAY WITH LOCALLY HEAVY RAINFALL...

.UPDATE...Ne Fl/se Ga has been upgraded to an Enhanced risk of
severe storms by SPC. Tornado watch currently in effect for ne
Fl...surface boundary has produced rotating storms this morning.
Additional storms over the Fl panhandle will move into and
strengthen over the area this afternoon as strong upper trough and
surface cold front approaches from the west. Instability and
shear will be adequate for severe storms with tornadoes. Locally
heavy rainfall will occur with areas of localized flooding
possible. Storms will decrease early this evening. Cold front will
move across the area overnight with a lingering chance of showers
and thunderstorms until around midnight.

&&

.AVIATION...Storms will continue to affect ne Fl TAF sites this
morning and continue through the afternoon hours as storms continue
to develop. Storms will move into and develop over se Ga by early
afternoon affecting SSI until early evening. MVFR conditions will
lower to IFR/LIFR conditions in heavy showers and storms. Storms
will decrease this evening by 01z with MVFR cigs expected through
at least 04z.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  80  62  79  58 /  80  50   0   0
SSI  81  68  81  65 /  80  50  10   0
JAX  81  64  83  62 / 100  60  10   0
SGJ  79  65  83  64 / 100  70  10   0
GNV  78  64  82  59 / 100  70  10   0
OCF  79  67  82  60 / 100  80  20   0

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AM...Small Craft Advisory until 2 PM EDT Thursday for Coastal waters
     from Altamaha Sound to Fernandina Beach FL out 20 NM-
     Coastal waters from Fernandina Beach to St. Augustine FL
     out 20 NM-Coastal waters from St. Augustine to Flagler
     Beach FL out 20 NM-Waters from Altamaha Sound GA to
     Fernandina Beach FL from 20 to 60 NM-Waters from Fernandina
     Beach to St. Augustine FL from 20 to 60 NM-Waters from St.
     Augustine to Flagler Beach FL from 20 to 60 NM.

&&

Zibura/Shashy/Corless

Hazardous weather outlook, May 24, 11:16 AM EDT, 21 minutes before

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In the hours before

Special weather statement, May 24, 8:09 AM EDT, 3 hours 28 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
809 AM EDT WED MAY 24 2017

FLZ033-038-241300-
St. Johns FL-Flagler FL-
809 AM EDT WED MAY 24 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN FLAGLER AND
SOUTHEASTERN ST. JOHNS COUNTIES UNTIL 900 AM EDT...

At 809 AM EDT, Doppler radar was tracking a strong thunderstorm near
Hastings, moving northeast at 25 mph.

Wind gusts of 40 to 50 mph can be expected along with possible minor
wind damage.

Locations impacted include...
Saint Augustine Beach, Marineland, Saint Augustine Shores, Butler
Beach, Crescent Beach and Dupont Center.

A tornado watch remains in effect until 300 PM EDT for northeastern
Florida.

LAT...LON 2955 8147 2961 8152 2963 8152 2989 8122
      2967 8115
TIME...MOT...LOC 1209Z 234DEG 21KT 2962 8146

PETERSON

Special weather statement, May 24, 8:36 AM EDT, 3 hours 1 minute before

Special Weather Statement
National Weather Service Jacksonville FL
836 AM EDT WED MAY 24 2017

FLZ036-037-241315-
Putnam FL-Alachua FL-
836 AM EDT WED MAY 24 2017

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL ALACHUA AND
NORTHWESTERN PUTNAM COUNTIES UNTIL 915 AM EDT...

At 836 AM EDT, Doppler radar was tracking a strong thunderstorm over
Hawthorne, or 9 miles south of Melrose, moving northeast at 25 mph.

Wind gusts of 40 to 50 mph can be expected along with possible minor
wind damage.

Locations impacted include...
Palatka, Interlachen, Hawthorne, George's Lake, Florahome, Melrose
Landing, Bardin, Hollister, Johnson and Putnam Hall.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A tornado watch remains in effect until 300 PM EDT for northern and
northeastern Florida.

LAT...LON 2947 8210 2958 8217 2975 8197 2975 8194
      2976 8193 2978 8193 2980 8191 2980 8186
      2984 8181 2964 8166
TIME...MOT...LOC 1236Z 234DEG 20KT 2957 8206

PETERSON

Local storm report, May 24, 8:43 AM EDT, 2 hours 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
843 AM EDT WED MAY 24 2017

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

0500 AM     TSTM WND GST     ST. AUGUSTINE           29.89N 81.31W
05/24/2017  E40 MPH          ST. JOHNS          FL   BROADCAST MEDIA

            TREE LIMB FELL DOWN OVER POWER LINES AND A VEHICLE. WIND
            SPEED ESTIMATED WITH RADAR.

&&

WCORLESS

Special weather statement, May 24, 8:58 AM EDT, 2 hours 39 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
858 AM EDT WED MAY 24 2017

FLZ033-241345-
St. Johns FL-
858 AM EDT WED MAY 24 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN ST. JOHNS COUNTY UNTIL
945 AM EDT...

At 857 AM EDT, Doppler radar was tracking a strong thunderstorm near
Federal Point, or near Hastings, moving northeast at 50 mph. Radar
indicated weak rotation with this storm. Tornadoes can occur with
little or no advanced warning.

Locations impacted include...
Saint Augustine, Hastings, Saint Augustine Beach, Crescent Beach,
Saint Augustine Shores, Butler Beach, Saint Augustine South, Vilano
Beach, Spuds and Anastasia.

LAT...LON 2971 8123 2969 8153 2976 8153 2976 8154
      2983 8154 3001 8133
TIME...MOT...LOC 1257Z 240DEG 49KT 2978 8151

WOLF

Special weather statement, May 24, 10:38 AM EDT, 59 minutes before

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Special weather statement, May 24, 10:39 AM EDT, 58 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 8:35 PM EDT	Special Weather Statement	JAX	Suwannee	40 min
May 23, 8:39 PM EDT	Special Weather Statement	JAX	Baker, Columbia	51 min
May 23, 8:53 PM EDT	Tornado Warning	JAX	Baker, Duval, Nassau	20 min
May 23, 9:12 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Duval, Nassau	17 min
May 23, 9:18 PM EDT	Special Weather Statement	JAX	Columbia	42 min
May 23, 9:28 PM EDT	Special Weather Statement	JAX	Nassau	47 min
May 23, 9:53 PM EDT	Areal Flood Advisory	JAX	Baker, Columbia, Suwannee	3 hr
May 24, 12:30 AM EDT	Special Weather Statement	JAX	Clay	45 min
May 24, 12:51 AM EDT	Special Weather Statement	JAX	Duval	39 min
May 24, 3:13 AM EDT	Special Weather Statement	JAX	Alachua	47 min
May 24, 3:16 AM EDT	Special Weather Statement	JAX	Clay	44 min
May 24, 3:43 AM EDT	Severe Thunderstorm Warning	JAX	Alachua, Clay, Putnam	47 min
May 24, 4:25 AM EDT	Severe Thunderstorm Warning	JAX	Clay, Putnam, Saint Johns	50 min
May 24, 4:58 AM EDT	Severe Thunderstorm Warning	JAX	Saint Johns	20 min
May 24, 4:59 AM EDT	Special Marine Warning	JAX		61 min
May 24, 5:47 AM EDT	Special Weather Statement	JAX	Putnam	43 min
May 24, 6:14 AM EDT	Special Weather Statement	JAX	Putnam	46 min
May 24, 6:18 AM EDT	Tornado Warning	JAX	Putnam, Saint Johns	27 min
May 24, 6:44 AM EDT	Tornado Warning	JAX	Saint Johns	31 min
May 24, 6:49 AM EDT	Special Marine Warning	JAX		56 min
May 24, 7:04 AM EDT	Special Weather Statement	JAX	Flagler	41 min
May 24, 7:46 AM EDT	Special Marine Warning	JAX		89 min
May 24, 8:09 AM EDT	Special Weather Statement	JAX	Saint Johns	51 min
May 24, 8:36 AM EDT	Special Weather Statement	JAX	Putnam	39 min
May 24, 8:56 AM EDT	Areal Flood Advisory	JAX	Putnam	3 hr
May 24, 8:58 AM EDT	Special Weather Statement	JAX	Saint Johns	47 min
May 24, 9:23 AM EDT	Severe Thunderstorm Warning	JAX	Putnam	37 min
May 24, 9:29 AM EDT	Tornado Warning	JAX	Putnam	31 min
May 24, 9:47 AM EDT	Tornado Warning	JAX	Saint Johns	28 min
May 24, 10:07 AM EDT	Tornado Warning	JAX	Saint Johns	23 min
May 24, 10:09 AM EDT	Special Marine Warning	JAX		51 min
May 24, 10:39 AM EDT	Special Weather Statement	JAX	Saint Johns	51 min
May 24, 10:47 AM EDT	Severe Thunderstorm Warning	JAX	Baker, Columbia, Hamilton, Suwannee	43 min
May 24, 10:49 AM EDT	Special Marine Warning	JAX		116 min
May 24, 12:06 PM EDT	Areal Flood Advisory	JAX	Baker, Duval, Nassau	114 min
May 24, 12:11 PM EDT	Special Weather Statement	JAX	Duval	49 min
May 24, 12:18 PM EDT	Special Weather Statement	JAX	Alachua, Bradford, Union	42 min
May 24, 12:42 PM EDT	Special Marine Warning	JAX		93 min
May 24, 12:52 PM EDT	Special Weather Statement	JAX	Clay, Duval	38 min
May 24, 1:19 PM EDT	Areal Flood Warning	JAX	Duval, Nassau	3 hr
May 24, 1:19 PM EDT	Special Weather Statement	JAX	Duval, Saint Johns	26 min
May 24, 1:24 PM EDT	Special Marine Warning	JAX		2 hr
May 24, 1:40 PM EDT	Special Weather Statement	JAX	Alachua, Clay, Flagler, Marion, Putnam, Saint Johns	65 min
May 24, 1:52 PM EDT	Areal Flood Advisory	JAX	Baker, Bradford, Clay, Duval, Saint Johns, Union	3 hr
May 24, 2:44 PM EDT	Special Weather Statement	JAX	Clay, Flagler, Marion, Putnam, Saint Johns	46 min
May 24, 3:25 PM EDT	Special Weather Statement	JAX	Flagler, Putnam, Saint Johns	35 min
May 24, 3:27 PM EDT	Special Marine Warning	JAX		93 min
May 23, 8:15 PM EDT	Tornado Warning	JAX	Pierce, Wayne	45 min
May 23, 8:55 PM EDT	Tornado Warning	JAX	Wayne	35 min
May 24, 10:38 AM EDT	Special Weather Statement	JAX	Atkinson, Clinch	52 min
May 24, 1:13 PM EDT	Special Weather Statement	JAX	Wayne	17 min
May 24, 5:07 PM EDT	Special Weather Statement	JAX	Atkinson, Coffee	38 min
May 24, 5:39 PM EDT	Special Weather Statement	JAX	Appling, Atkinson, Bacon, Coffee	51 min

Nearby

Severe Thunderstorm Warnings in Florida, 2017 Every severe thunderstorm warning in 2017

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.