Alert archive / Florida / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 81, NWS Jacksonville, FL

April 4, 2017Marion County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 4, 2017, 11:30 AM EDT for Marion County, Florida. It was in force for 45 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: Apr 4, 2017, 11:30 AM EDT (15:30 UTC)
Expired: Apr 4, 2017, 12:15 PM EDT
In force: 45 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Marion County, FL

The radar

The Jacksonville radar (KJAX), 146 km from the middle of the area, began a volume at 15:34 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, 3.5 hours before the alert went out and 148 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: 130 J/kg
Mixed-layer CIN: -199 J/kg
Mixed-layer LCL: 740 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 236 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Apr 4, 9:17 AM EDT, 2 hours 13 minutes earlier.

Area forecast discussion, Apr 4, 9:17 AM EDT, 2 hours 13 minutes before

Area Forecast Discussion
National Weather Service Jacksonville FL
917 AM EDT Tue Apr 4 2017

.UPDATE...

Frontal boundary will slowly sink South across NE FL Today. Short
wave energy at 500 mb is helping to keep convection going along
this boundary this morning. This upper energy weakens into this
afternoon, leading to dissipating convection. Temperatures will be
held nearly steady for awhile this morning, but decreasing cloud
cover from North to South will allow temperatures to rise into
the afternoon.

&&

.AVIATION...

Showers and storms will continue this morning into early afternoon,
mainly South of KJAX. Reductions along with gusty winds are
expected in these storms.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  84  68  85  57 /  10  30  50  70
SSI  77  69  83  62 /  20  20  30  70
JAX  82  70  90  64 /  60  20  20  70
SGJ  80  69  90  66 /  90  20  10  50
GNV  82  68  90  63 /  90  30  10  70
OCF  85  68  91  65 /  80  20  10  60

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AM...Small Craft Advisory until 4 PM EDT this afternoon for 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.

&&

Struble

Hazardous weather outlook, Apr 4, 4:01 AM EDT, 7 hours 29 minutes before

Hazardous Weather Outlook
National Weather Service Jacksonville FL
401 AM EDT Tue Apr 4 2017

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125-
GAZ132>136-149>154-162>166-051000-
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-
Hamilton-Suwannee-Columbia-Baker-Inland Nassau-Inland Duval-Union-
Bradford-Clay-St. Johns-Gilchrist-Alachua-Putnam-Flagler-Marion-
Coastal Nassau-Coastal Duval-Coffee-Jeff Davis-Bacon-Appling-
Wayne-Atkinson-Ware-Pierce-Brantley-Inland Glynn-Coastal Glynn-
Echols-Clinch-Charlton-Inland Camden-Coastal Camden-
401 AM EDT Tue Apr 4 2017

...SMALL CRAFT ADVISORY FOR THE OFFSHORE WATERS...

...SEVERE THUNDERSTORMS POSSIBLE ON WEDNESDAY AND WEDNESDAY NIGHT...

This Hazardous Weather Outlook is for Northeast Florida,
Southeast Georgia and the Adjacent Coastal Waters.

.DAY ONE...Today and Tonight...

Band of Strong Thunderstorms with locally heavy rainfall and gusty
winds from the FL/GA border southward across Northeast Florida
will continue this morning before fading this afternoon. A few
storms may become strong to severe at times with damaging winds
and large hail. Locally heavy rainfall is possible with temporary
and minor flooding issues at times.

Small Craft Advisory will remain in effect through the afternoon
for the offshore waters.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

Another strong frontal boundary will approach Wednesday and push
through the region Wednesday Night and early Thursday with another
round of strong to severe thunderstorms expected. Stronger
activity will be capable of producing damaging wind gusts,
isolated tornadoes and locally heavy rainfall.

Windy conditions are expected Wednesday through Friday and Small
Craft Advisories are expected over the coastal waters, with near
Gale Force wind gusts possible. Wind Advisories may be required
for the land areas on Wednesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

For additional information, visit the National Weather Service in
Jacksonville website on the internet at weather.gov/jax.

In the hours before

Local storm report, Apr 4, 10:37 AM EDT, 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1037 AM EDT TUE APR 04 2017

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

0845 AM     TSTM WND DMG     1 SSW GAINESVILLE       29.67N 82.34W
04/04/2017                   ALACHUA            FL   BROADCAST MEDIA

            TREE DOWN ACROSS ROAD BLOCKING TRAFFIC AT NW 13TH ST AND
            NW 16TH AVE IN GAINESVILLE.

&&

WCORLESS

Local storm report, Apr 4, 10:43 AM EDT, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1043 AM EDT TUE APR 04 2017

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

1030 AM     FLOOD            1 ESE FLAGLER BEACH     29.47N 81.12W
04/04/2017                   XXX                XX   EMERGENCY MNGR

            TRAFFIC ALONG HIGHWAY A1A SLOWED DUE TO FLOODING CAUSED
            BY TRAPPED RAINWATER.

&&

WCORLESS

Special weather statement, Apr 4, 10:46 AM EDT, 44 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
1046 AM EDT TUE APR 4 2017

FLZ036-037-040-041530-
Putnam FL-Alachua FL-Marion FL-
1046 AM EDT TUE APR 4 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN ALACHUA...
SOUTHWESTERN PUTNAM AND NORTHERN MARION COUNTIES UNTIL 1130 AM EDT...

At 1046 AM EDT, Doppler radar was tracking a strong thunderstorm over
Williston Municipal Airport, or over Williston, moving east at 25
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...
Fort McCoy, Salt Springs, Citra, Lake Delancy, Sparr, Anthony, Cross
Creek, Orange Springs, Reddick and McIntosh.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2926 8241 2948 8241 2955 8176 2933 8165
      2932 8168 2929 8165 2924 8164
TIME...MOT...LOC 1446Z 269DEG 21KT 2935 8247

NELSON

Local storm report, Apr 4, 11:05 AM EDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1105 AM EDT TUE APR 04 2017

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

1015 AM     HEAVY RAIN       7 SSW LAKE CITY         30.10N 82.69W
04/04/2017  M8.10 INCH       COLUMBIA           FL   COCORAHS

            DAILY RAINFALL AMOUNT OF 8.10 INCHES REPORTED BY COCORAHS
            OBSERVER 8 MILES SSW OF LAKE CITY.

&&

WCORLESS

Local storm report, Apr 4, 11:07 AM EDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1107 AM EDT TUE APR 04 2017

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

1015 AM     HEAVY RAIN       4 SW GLEN ST. MARY      30.23N 82.21W
04/04/2017  M6.13 INCH       BAKER              FL   COCORAHS

            DAILY RAINFALL AMOUNT OF 6.13 INCHES REPORTED BY COCORAHS
            OBSERVER 4 MILES SW OF GLEN ST MARY.

&&

WCORLESS

Special weather statement, Apr 4, 11:07 AM EDT, 23 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
1107 AM EDT TUE APR 4 2017

FLZ037-038-041615-
Putnam FL-Flagler FL-
1107 AM EDT TUE APR 4 2017

...SIGNIFICANT WEATHER ADVISORY FOR FLAGLER AND SOUTHEASTERN PUTNAM
COUNTIES UNTIL 1215 PM EDT...

At 1107 AM EDT, Doppler radar was tracking a strong thunderstorm near
Lake Delancy, or near Salt Springs, moving east at 25 mph.

Excessive cloud-to-ground lightning and Wind gusts of 45 to 55 mph
can be expected along with possible minor damage.

Locations impacted include...
Palm Coast, Flagler Beach, Bunnell, Crescent City, Pomona Park,
Andalusia, Fruitland, Welaka, Beverly Beach and Espanola.

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 2946 8110 2946 8112 2943 8110 2941 8115
      2927 8115 2926 8141 2940 8142 2938 8145
      2932 8168 2934 8168 2934 8166 2936 8166
      2937 8167 2937 8173 2949 8175 2964 8115
      2952 8110
TIME...MOT...LOC 1507Z 265DEG 20KT 2937 8182

NELSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 3, 8:17 PM EDT	Special Weather Statement	JAX	Hamilton, Suwannee	43 min
Apr 3, 8:34 PM EDT	Severe Thunderstorm Warning	JAX	Hamilton, Suwannee	41 min
Apr 3, 9:17 PM EDT	Special Marine Warning	JAX		88 min
Apr 3, 9:23 PM EDT	Special Weather Statement	JAX	Hamilton	52 min
Apr 3, 9:58 PM EDT	Special Weather Statement	JAX	Suwannee	47 min
Apr 3, 10:39 PM EDT	Special Weather Statement	JAX	Columbia, Suwannee	51 min
Apr 3, 11:27 PM EDT	Special Weather Statement	JAX	Suwannee	48 min
Apr 4, 12:22 AM EDT	Special Weather Statement	JAX	Suwannee	38 min
Apr 4, 12:59 AM EDT	Severe Thunderstorm Warning	JAX	Columbia, Suwannee	46 min
Apr 4, 1:34 AM EDT	Severe Thunderstorm Warning	JAX	Bradford, Columbia, Union	41 min
Apr 4, 1:48 AM EDT	Special Weather Statement	JAX	Columbia, Suwannee	42 min
Apr 4, 2:51 AM EDT	Areal Flood Advisory	JAX	Suwannee	3 hr
Apr 4, 2:56 AM EDT	Special Weather Statement	JAX	Duval	49 min
Apr 4, 3:43 AM EDT	Special Marine Warning	JAX		92 min
Apr 4, 3:46 AM EDT	Special Weather Statement	JAX	Duval	59 min
Apr 4, 4:01 AM EDT	Special Weather Statement	JAX	Duval	74 min
Apr 4, 4:34 AM EDT	Severe Thunderstorm Warning	JAX	Duval, Saint Johns	41 min
Apr 4, 5:24 AM EDT	Special Weather Statement	JAX	Duval	51 min
Apr 4, 5:36 AM EDT	Areal Flood Warning	JAX	Baker, Bradford, Columbia, Hamilton, Suwannee, Union	6 hr
Apr 4, 5:47 AM EDT	Areal Flood Advisory	JAX	Clay, Duval, Saint Johns	3 hr
Apr 4, 6:19 AM EDT	Special Weather Statement	JAX	Duval	41 min
Apr 4, 6:23 AM EDT	Severe Thunderstorm Warning	JAX	Duval, Saint Johns	22 min
Apr 4, 6:27 AM EDT	Special Marine Warning	JAX		63 min
Apr 4, 6:40 AM EDT	Special Weather Statement	JAX	Bradford, Clay, Saint Johns, Union	50 min
Apr 4, 6:52 AM EDT	Severe Thunderstorm Warning	JAX	Columbia, Gilchrist, Suwannee	36 min
Apr 4, 6:59 AM EDT	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Clay, Putnam	46 min
Apr 4, 7:09 AM EDT	Special Marine Warning	JAX		111 min
Apr 4, 7:09 AM EDT	Severe Thunderstorm Warning	JAX	Duval	17 min
Apr 4, 7:31 AM EDT	Areal Flood Advisory	JAX	Alachua, Bradford, Clay, Columbia, Gilchrist, Putnam and 2 more	119 min
Apr 4, 7:35 AM EDT	Special Weather Statement	JAX	Saint Johns	55 min
Apr 4, 7:39 AM EDT	Special Weather Statement	JAX	Alachua, Clay	66 min
Apr 4, 7:42 AM EDT	Special Weather Statement	JAX	Baker, Columbia, Suwannee, Union	63 min
Apr 4, 7:46 AM EDT	Severe Thunderstorm Warning	JAX	Alachua, Bradford	44 min
Apr 4, 8:00 AM EDT	Severe Thunderstorm Warning	JAX	Alachua	45 min
Apr 4, 8:24 AM EDT	Areal Flood Warning	JAX	Alachua, Bradford, Columbia, Gilchrist, Union	3 hr
Apr 4, 8:37 AM EDT	Special Weather Statement	JAX	Flagler	38 min
Apr 4, 8:40 AM EDT	Severe Thunderstorm Warning	JAX	Alachua, Putnam	65 min
Apr 4, 9:00 AM EDT	Severe Thunderstorm Warning	JAX	Alachua, Marion	45 min
Apr 4, 9:10 AM EDT	Tornado Warning	JAX	Marion	35 min
Apr 4, 9:12 AM EDT	Special Marine Warning	JAX		2 hr
Apr 4, 9:21 AM EDT	Tornado Warning	JAX	Alachua, Marion	24 min
Apr 4, 9:24 AM EDT	Special Weather Statement	JAX	Flagler	51 min
Apr 4, 9:34 AM EDT	Areal Flood Advisory	JAX	Alachua, Bradford, Clay, Columbia, Gilchrist, Putnam and 2 more	3 hr
Apr 4, 9:43 AM EDT	Severe Thunderstorm Warning	JAX	Alachua, Marion, Putnam	62 min
Apr 4, 10:15 AM EDT	Special Weather Statement	JAX	Flagler, Putnam	45 min
Apr 4, 10:46 AM EDT	Special Weather Statement	JAX	Marion	44 min
Apr 4, 10:54 AM EDT	Areal Flood Advisory	JAX	Alachua, Flagler, Marion, Putnam, Saint Johns	81 min
Apr 4, 11:07 AM EDT	Special Weather Statement	JAX	Flagler	68 min
Apr 4, 11:30 AM EDT	Areal Flood Advisory	JAX	Baker, Bradford, Clay, Columbia, Duval, Hamilton and 2 more	60 min
Apr 4, 12:12 PM EDT	Severe Thunderstorm Warning	JAX	Marion, Putnam	63 min
Apr 4, 12:34 PM EDT	Areal Flood Advisory	JAX	Alachua, Baker, Bradford, Columbia, Gilchrist, Hamilton and 2 more	116 min
Apr 4, 12:38 PM EDT	Areal Flood Advisory	JAX	Alachua, Bradford, Clay, Flagler, Marion, Putnam	2 hr
Apr 4, 1:01 PM EDT	Special Weather Statement	JAX	Flagler	44 min
Apr 4, 1:22 PM EDT	Special Marine Warning	JAX		53 min
Apr 4, 3:23 PM EDT	Severe Thunderstorm Warning	JAX	Marion	52 min
Apr 4, 4:08 PM EDT	Special Weather Statement	JAX	Marion	37 min
Apr 4, 4:27 PM EDT	Severe Thunderstorm Warning	JAX	Marion	9 min
Apr 4, 5:46 PM EDT	Special Weather Statement	JAX	Suwannee	29 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.