Alert archive / Florida / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 184, NWS Jacksonville, FL

June 30, 2015Hamilton County, Suwannee County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 30, 2015, 7:22 PM EDT for Hamilton County, Suwannee 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
Jun 30, 2015, 7:22 PM EDT (23:22 UTC)
Expired
Jun 30, 2015, 8:00 PM EDT
In force
38 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon

Counties Hamilton County, FL, Suwannee County, FL

The radar

The Moody AFB radar (KVAX), 61 km from the middle of the area, began a volume at 23:24 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.

IssuedProductOfficeLasted
Jun 30, 1:57 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 11.4 hours before the alert went out and 123 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 2015-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 848 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 2015-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.1939Sfc1 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
848 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
913 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
-26 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 Jun 30, 1:31 PM EDT, 5 hours 51 minutes earlier.

Area forecast discussion, Jun 30, 1:31 PM EDT, 5 hours 51 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
131 PM EDT TUE JUN 30 2015

.SHORT TERM.../TONIGHT AND WEDNESDAY/...
OLD FRONTAL SYSTEM IN THE AREA WILL MOVE NORTH WITH THE CONVECTION
ALONG IT STRONG TO POSSIBLY SEVERE THIS AFTERNOON. A MESOSCALE
CONVECTIVE SYSTEM OVER SOUTH-CENTRAL ALABAMA WILL DROP EAST-
SOUTHEAST INTO THE NWS JACKSONVILLE AREA OF RESPONSIBILITY THROUGH
THE EARLY EVENING WITH A POSSIBLE SECOND ROUND OF SEVERE WEATHER
AS IT APPROACHES THIS EVENING. THE BOW ECHO LOOKS LIKE IT MIGHT
WEAKEN AS IT APPROACHES THE EAST COAST AND IT DOES WEAKEN OVER
THE COASTAL WATERS. SO LOOKS LIKE THE BEST CHANCE OF A SECOND
ROUND OF SEVERE WEATHER WILL BE OVER THE SUWANNEE VALLEY AND
INTERIOR SOUTHEAST GEORGIA. CONVECTION SHOULD TOTALLY END BY
MIDNIGHT WITH CLEARING SKIES IN MOST AREAS. OVERNIGHT LOWS WILL BE
IN THE MID 70S AND THE CHANCE OF PRECIPITATION WILL BE AROUND 60
PERCENT EARLY IN THE EVENING.

THE BROAD EAST COAST UPPER LEVEL TROUGH WILL REMAIN IN PLACE WITH
A GENERALLY WEST TO WEST-NORTHWEST UPPER LEVEL FLOW. THINGS SHOULD
BE A LITTLE MORE SUBSIDENT TOMORROW WITH POPS GENERALLY IN THE
20-30 PERCENT RANGE OVER GEORGIA AND THE 30-40 PERCENT RANGE OF
FLORIDA. HIGHS WILL GENERALLY BE IN THE LOWER TO MID 90S WITH
LESS CLOUD COVERAGE AND LATER ONSET OF CONVECTION.

/WEDNESDAY NIGHT THROUGH THURSDAY NIGHT/...
THE BROAD UPPER LEVEL TROUGH COVERING THE EASTERN UNITED
STATES WILL REMAIN FAIRLY STATIONARY WITH A FEW IMPULSES
ROUNDING IT'S BASE IMPACTING THE LOCAL REGION. THE AXIS
OF THE WESTERN EXTENSION OF THE BERMUDA RIDGE WILL STAY
OVER SOUTH CENTRAL FLORIDA KEEPING LOW LEVEL WINDS OUT
OF THE WEST TO SOUTHWEST. WITH AMPLE MOISTURE IN PLACE
ALONG WITH INCREASED INSTABILITY, WE SEE A FAIRLY ACTIVE
PERIOD FOR CONVECTION.  HENCE...THERE WILL BE A CONTINUED
PATTERN OF SCATTERED LATE NIGHT AND MORNING STORMS NEAR
GULF COAST SPREADING INLAND TOWARDS EAST COAST DURING
THE AFTERNOON/EVE. TEMPS WILL AVERAGE SLIGHTLY ABOVE
NORMAL DUE TO CLOUD COVER AND TSTMS/RAINFALL.

.LONG TERM /FRIDAY THROUGH MONDAY/...
BERMUDA RIDGE WILL GRADUALLY BUILD INTO THE FL PENINSULA
AS THE TROUGH OVER THE AREA DEAMPLIFIES. WILL TRANSISTION
TO A LIGHTER S AND SW FLOW WHICH RESULTS IN MORE DIURNAL
TYPE SCATTERED CONVECTION EACH DAY WITH BEST COVERAGE
ACROSS THE INLAND AREAS WHERE SEABREEZES AND OTHER
OUTFLOWS MERGE. RISING HEIGHTS RESULTS IN TEMPS
WARMING TO ABOVE NORMAL WITH HIGHS MOSTLY IN THE MID 90S.

&&

.AVIATION...
WILL MAINTAIN TEMPO GROUPS FOR ALL OF THE LOCAL FIELDS THROUGH
ABOUT 02 UTC. CEILINGS WILL CONVECTION ARE EXPECTED TO BE IN THE
3.0-5.0 KFT RANGE AND LOOK FOR GUSTY WINDS THIS EVENING IF THE BOW
ECHO MOVES OVER THE LOCAL FIELDS.

&&

.MARINE...
THE LOCAL AREA REMAINS SQUEEZED BETWEEN THE BERMUDA-AZORES RIDGE
TO OUR SOUTH AND GENERAL LOW PRESSURE TO OUR NORTH. WE SHOULD
MAINTAIN A SOUTHWESTERLY FLOW PATTERN THROUGH THE LATER PORTION OF
THE WEEK AND MAYBE A BIT MORE SOUTHERLY OVER THE WEEKEND AND THE
RIDGE NOSES OFFSHORE.

RIP CURRENTS: LOW RISK THROUGH WEDNESDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  72  93  73  93 /  60  20  20  50
SSI  75  92  77  89 /  60  30  30  30
JAX  74  93  73  93 /  60  30  20  50
SGJ  74  91  76  91 /  60  30  20  40
GNV  72  91  73  93 /  50  30  20  50
OCF  73  92  73  92 /  40  30  20  60

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...NONE.
GA...NONE.
AM...NONE.
&&

CORDERO/SANDRIK/WALSH
Hazardous weather outlook, Jun 30, 5:29 PM EDT, 1 hour 53 minutes before
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In the hours before

Local storm report, Jun 30, 5:45 PM EDT, 1 hour 37 minutes before
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Special weather statement, Jun 30, 5:45 PM EDT, 1 hour 37 minutes before
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Local storm report, Jun 30, 5:52 PM EDT, 1 hour 30 minutes before
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Local storm report, Jun 30, 6:19 PM EDT, 1 hour 3 minutes before
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Special weather statement, Jun 30, 6:30 PM EDT, 52 minutes before
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Special weather statement, Jun 30, 7:12 PM EDT, 10 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 30, 11:59 AM EDTSpecial Weather StatementJAXAlachua, Baker, Columbia, Union31 min
Jun 30, 12:27 PM EDTSpecial Weather StatementJAXBradford, Clay33 min
Jun 30, 12:43 PM EDTSpecial Weather StatementJAXColumbia, Hamilton, Suwannee47 min
Jun 30, 1:02 PM EDTSevere Thunderstorm WarningJAXColumbia, Hamilton, Suwannee28 min
Jun 30, 1:12 PM EDTSevere Thunderstorm WarningJAXHamilton48 min
Jun 30, 1:29 PM EDTSevere Thunderstorm WarningJAXBaker, Columbia, Hamilton46 min
Jun 30, 1:59 PM EDTSevere Thunderstorm WarningJAXColumbia, Hamilton, Suwannee46 min
Jun 30, 2:13 PM EDTSevere Thunderstorm WarningJAXNassau32 min
Jun 30, 2:20 PM EDTSpecial Marine WarningJAX115 min
Jun 30, 2:29 PM EDTSevere Thunderstorm WarningJAXBaker, Columbia, Suwannee46 min
Jun 30, 2:43 PM EDTSpecial Weather StatementJAXNassau47 min
Jun 30, 2:54 PM EDTSpecial Marine WarningJAX2 hr
Jun 30, 3:15 PM EDTSpecial Weather StatementJAXBradford, Clay, Union60 min
Jun 30, 3:33 PM EDTSpecial Weather StatementJAXDuval42 min
Jun 30, 3:54 PM EDTSpecial Weather StatementJAXSuwannee36 min
Jun 30, 4:01 PM EDTSevere Thunderstorm WarningJAXDuval, Saint Johns14 min
Jun 30, 4:06 PM EDTSpecial Weather StatementJAXSaint Johns24 min
Jun 30, 4:13 PM EDTSpecial Marine WarningJAX92 min
Jun 30, 4:15 PM EDTSpecial Weather StatementJAXMarion45 min
Jun 30, 4:31 PM EDTSpecial Weather StatementJAXSaint Johns29 min
Jun 30, 5:01 PM EDTSpecial Marine WarningJAX59 min
Jun 30, 7:12 PM EDTSpecial Weather StatementJAXSuwannee48 min
Jun 30, 7:52 PM EDTSpecial Weather StatementJAXColumbia23 min
Jun 30, 12:22 PM EDTSpecial Weather StatementJAXAtkinson38 min
Jun 30, 12:53 PM EDTSpecial Weather StatementJAXClinch, Echols, Ware52 min
Jun 30, 1:35 PM EDTSpecial Weather StatementJAXAtkinson, Coffee40 min
Jun 30, 2:36 PM EDTSpecial Weather StatementJAXAppling, Bacon, Jeff Davis39 min
Jun 30, 2:44 PM EDTSpecial Weather StatementJAXJeff Davis46 min
Jun 30, 2:58 PM EDTSpecial Weather StatementJAXGlynn32 min
Jun 30, 3:03 PM EDTSpecial Weather StatementJAXCamden27 min
Jun 30, 3:09 PM EDTSpecial Weather StatementJAXAtkinson51 min
Jun 30, 3:26 PM EDTSevere Thunderstorm WarningJAXAppling, Jeff Davis23 min
Jun 30, 3:46 PM EDTSpecial Weather StatementJAXCoffee44 min
Jun 30, 3:50 PM EDTSpecial Weather StatementJAXAppling25 min
Jun 30, 4:14 PM EDTSpecial Weather StatementJAXAppling, Bacon, Coffee46 min
Jun 30, 5:45 PM EDTSpecial Weather StatementJAXCoffee45 min
Jun 30, 6:30 PM EDTSpecial Weather StatementJAXAtkinson45 min

Nearby

Severe Thunderstorm Warnings in Florida, 2015Every severe thunderstorm warning in 2015

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.