Alert archive / Florida / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 299, NWS Jacksonville, FL

August 22, 2015Columbia County, Gilchrist County, Suwannee County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 22, 2015, 11:27 PM EDT for Columbia County, Gilchrist County, Suwannee County, Florida. It was in force for 63 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
Aug 22, 2015, 11:27 PM EDT (03:27 UTC)
Expired
Aug 23, 2015, 12:30 AM EDT
In force
63 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon

Counties Columbia County, FL, Gilchrist County, FL, Suwannee County, FL

The radar

The Moody AFB radar (KVAX), 95 km from the middle of the area, began a volume at 03:28 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 00:00Z, 3.5 hours before the alert went out and 117 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 00:00Z on 2015-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1980 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 00:00Z on 2015-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
1980 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
1031 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
14 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 Aug 22, 9:06 PM EDT, 2 hours 21 minutes earlier.

Area forecast discussion, Aug 22, 9:06 PM EDT, 2 hours 21 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
906 PM EDT SAT AUG 22 2015

.UPDATE...
ISOLATED TO SCATTERED ACTIVITY HAS DIMINISHED ACROSS NORTHEAST
FLORIDA HAS DIMINISHED. FURTHER NORTH...A CLUSTER OF STORMS THAT
DEVELOPED LATE IN THE AFTN ACROSS SOUTH CAROLINA/GEORGIA CLOSE
TO A DECAYING SURFACE FRONT HAVE MOVED SOUTH INTO SE GEORGIA
PRODUCING STRONG WINDS. THIS CLUSTER WILL BEGIN TO WEAKEN OVER
THE NEXT HOUR OR TWO AS IT APPROACHED NE FLORIDA. WILL INCLUDE
SCATTERED TSTMS OVER NE FLORIDA LATE THIS EVENING FOR THIS
POTENTIAL. LOWS IN THE MID 70S WILL GENERALLY PREVAIL.

&&

.AVIATION...
VFR WILL PREVAIL FOR THE NEXT 24 HOURS. WILL USE VCTS FOR SSI
FOR THE NEXT HOUR OR SO WITH MOST OF THE ACTIVITY REMAINING TO
THE WEST.

&&

.MARINE...
ONSHORE WINDS 5 TO 10 KNOTS WILL PREVAIL FOR THE NEXT 24 HOURS.

RIP CURRENTS: LOW RISK.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  75  93  74  95 /  10  50  30  30
SSI  78  88  78  91 /  40  20  30  20
JAX  75  92  75  93 /  40  40  30  30
SGJ  77  89  76  90 /  10  20  30  30
GNV  75  93  74  94 /  30  50  40  30
OCF  75  93  74  94 /  30  50  30  40

&&

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

ALLEN/SHULER/GUILLET
Hazardous weather outlook, Aug 22, 9:58 AM EDT, 13 hours 29 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
958 AM EDT SAT AUG 22 2015

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125-
GAZ132>136-149>154-162>166-230845-
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-
958 AM EDT SAT AUG 22 2015

...STRONG TO SEVERE THUNDERSTORMS POSSIBLE SUNDAY AFTERNOON AND
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST FLORIDA...
SOUTHEAST GEORGIA AND THE ADJACENT COASTAL WATERS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

WIDELY SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE
EXPECTED...MOSTLY AT INLAND LOCATIONS. A FEW STRONG THUNDERSTORMS
ARE POSSIBLE...MOSTLY ALONG THE INTERSTATE 75 CORRIDOR DURING THE
LATE AFTERNOON AND EARLY EVENING HOURS. STRONGER ACTIVITY WILL BE
CAPABLE OF PRODUCING GUSTY WINDS...FREQUENT LIGHTNING...AND
LOCALIZED FLOODING DUE TO EXPECTED SLOW MOVEMENT OF THUNDERSTORMS.

HEAT INDEX VALUES WILL PEAK AT 102-107 DEGREES THIS AFTERNOON.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...
SCATTERED TO NUMEROUS AFTERNOON AND EVENING THUNDERSTORMS ARE
EXPECTED ON SUNDAY. STRONG TO LOCALLY SEVERE THUNDERSTORMS WILL BE
POSSIBLE...WITH DAMAGING WIND GUSTS AND FREQUENT LIGHTNING STRIKES
BEING THE PRIMARY THREATS AS ACTIVITY MOVES GENERALLY
SOUTHEASTWARD AT 10-15 MPH.

A FRONTAL BOUNDARY WILL STALL OVER OUR REGION NEXT WEEK...CREATING
SCATTERED MAINLY AFTERNOON AND EVENING THUNDERSTORMS. STRONG
THUNDERSTORMS WILL BE POSSIBLE EACH DAY...MAINLY OVER NORTHEAST
AND NORTH CENTRAL FLORIDA AND COASTAL SOUTHEAST GEORGIA. STRONGER
ACTIVITY WILL BE CAPABLE OF PRODUCING GUSTY WINDS AND FREQUENT
LIGHTNING STRIKES.

LONG PERIOD SWELLS FROM DISTANT HURRICANE DANNY MAY REACH OUR
COASTAL WATERS TOWARDS MIDWEEK...WHICH WOULD INCREASE THE THREAT
FOR RIP CURRENTS AT AREA BEACHES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE
IN JACKSONVILLE WEBSITE ON THE INTERNET AT WEATHER.GOV/JAX.

PLW

In the hours before

Special weather statement, Aug 22, 9:52 PM EDT, 1 hour 35 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Special weather statement, Aug 22, 9:58 PM EDT, 1 hour 29 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Special weather statement, Aug 22, 10:08 PM EDT, 1 hour 19 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Special weather statement, Aug 22, 10:32 PM EDT, 55 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Local storm report, Aug 22, 10:59 PM EDT, 28 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Special weather statement, Aug 22, 11:12 PM EDT, 15 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 9:15 PM EDTSevere Thunderstorm WarningJAXNassau45 min
Aug 22, 9:50 PM EDTSpecial Weather StatementJAXHamilton40 min
Aug 22, 9:58 PM EDTSpecial Weather StatementJAXDuval32 min
Aug 22, 10:08 PM EDTSpecial Weather StatementJAXUnion52 min
Aug 22, 10:18 PM EDTSevere Thunderstorm WarningJAXColumbia, Hamilton, Suwannee57 min
Aug 22, 10:32 PM EDTSpecial Weather StatementJAXUnion58 min
Aug 22, 10:49 PM EDTAreal Flood AdvisoryJAXHamilton86 min
Aug 22, 10:53 PM EDTSevere Thunderstorm WarningJAXColumbia, Hamilton, Suwannee37 min
Aug 22, 11:12 PM EDTSpecial Weather StatementJAXSuwannee63 min
Aug 22, 11:14 PM EDTAreal Flood AdvisoryJAXColumbia, Hamilton, Suwannee91 min
Aug 22, 11:56 PM EDTAreal Flood AdvisoryJAXColumbia, Gilchrist, Suwannee94 min
Aug 23, 12:20 AM EDTSpecial Weather StatementJAXGilchrist55 min
Aug 23, 12:29 AM EDTAreal Flood AdvisoryJAXGilchrist91 min
Aug 23, 3:44 PM EDTSpecial Weather StatementJAXSuwannee46 min
Aug 23, 4:00 PM EDTSpecial Weather StatementJAXHamilton45 min
Aug 23, 4:26 PM EDTSpecial Marine WarningJAX49 min
Aug 23, 4:31 PM EDTSpecial Weather StatementJAXColumbia44 min
Aug 23, 4:37 PM EDTSpecial Marine WarningJAX53 min
Aug 23, 4:50 PM EDTSevere Thunderstorm WarningJAXBaker, Columbia40 min
Aug 23, 4:59 PM EDTSpecial Weather StatementJAXAlachua, Baker, Bradford, Columbia, Union46 min
Aug 23, 5:03 PM EDTSevere Thunderstorm WarningJAXNassau27 min
Aug 23, 5:13 PM EDTSpecial Marine WarningJAX92 min
Aug 23, 5:17 PM EDTSevere Thunderstorm WarningJAXDuval, Nassau58 min
Aug 23, 5:39 PM EDTSpecial Weather StatementJAXAlachua, Bradford, Clay, Union51 min
Aug 23, 6:05 PM EDTSevere Thunderstorm WarningJAXDuval, Saint Johns25 min
Aug 23, 6:24 PM EDTSpecial Weather StatementJAXClay, Putnam, Saint Johns51 min
Aug 23, 6:25 PM EDTSpecial Marine WarningJAX95 min
Aug 23, 6:35 PM EDTSpecial Weather StatementJAXDuval40 min
Aug 23, 7:26 PM EDTSpecial Weather StatementJAXFlagler, Putnam, Saint Johns49 min
Aug 23, 7:41 PM EDTAreal Flood AdvisoryJAXFlagler, Marion, Putnam, Saint Johns2 hr
Aug 22, 8:13 PM EDTSevere Thunderstorm WarningJAXBrantley, Glynn, Wayne32 min
Aug 22, 8:35 PM EDTSevere Thunderstorm WarningJAXCamden40 min
Aug 22, 8:45 PM EDTSpecial Weather StatementJAXBrantley, Ware30 min
Aug 22, 9:01 PM EDTSevere Thunderstorm WarningJAXBrantley, Charlton, Pierce, Ware29 min
Aug 22, 9:51 PM EDTSpecial Weather StatementJAXCharlton39 min
Aug 22, 9:52 PM EDTSpecial Weather StatementJAXClinch, Ware38 min
Aug 23, 1:49 PM EDTSpecial Weather StatementJAXCoffee56 min
Aug 23, 2:15 PM EDTSpecial Weather StatementJAXAppling45 min
Aug 23, 2:46 PM EDTSpecial Weather StatementJAXAtkinson44 min
Aug 23, 3:12 PM EDTSpecial Weather StatementJAXBrantley, Pierce, Wayne48 min
Aug 23, 3:37 PM EDTSevere Thunderstorm WarningJAXClinch38 min
Aug 23, 4:04 PM EDTSpecial Weather StatementJAXBrantley41 min
Aug 23, 4:18 PM EDTSpecial Weather StatementJAXCharlton, Clinch, Ware42 min
Aug 23, 4:42 PM EDTSpecial Weather StatementJAXCamden, Glynn33 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.