Alert archive / Florida / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 234, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 31, 2011, 3:53 PM EDT for Marion County, Florida. It was in force for 52 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
- Jul 31, 2011, 3:53 PM EDT (19:53 UTC)
- Expired
- Jul 31, 2011, 4:45 PM EDT
- In force
- 52 min
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
County Marion County, FL
The radar
The Jacksonville radar (KJAX), 146 km from the middle of the area, began a volume at 19:56 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, 7.9 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.
- Mixed-layer CAPE
- 2510 J/kg
- Mixed-layer CIN
- -56 J/kg
- Mixed-layer LCL
- 952 m above ground
- 0-6 km bulk shear
- 2 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jul 31, 2:30 PM EDT, 1 hour 23 minutes earlier.
Area forecast discussion, Jul 31, 2:30 PM EDT, 1 hour 23 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSONVILLE FL 230 PM EDT SUN JUL 31 2011 .SHORT TERM...CONVECTIVE TEMPERATURE HAS BEEN REACHED WITH DOPPLER RADARS SHOWING SHOWERS AND THUNDERSTORMS QUICKLY FORMING ACROSS NORTHEAST FLORIDA WITH LIMITED COVERAGE NOTED ACROSS SOUTHEAST GEORGIA. FOR THE REMAINDER OF THIS AFTERNOON...SHOWERS AND STORMS WILL LIKELY QUICKLY FILL IN ACROSS NORTHEAST FLORIDA WITH ACTIVITY INCREASING ACROSS SOUTHEAST GEORGIA LATER THIS AFTERNOON AS A SHORTWAVE TROUGH IS FORECAST TO REACH THIS AREA LATE IN THE DAY. SHOWERS AND STORMS WILL PROVIDE RELIEF FROM THE HEAT AS TEMPERATURES HAVE ALREADY SOARED INTO THE MID AND UPPER 90S WITH HEAT INDICES BETWEEN 100 AND 110 DEGREES. WITH SUCH AN UNSTABLE ATMOSPHERE...SHOWERS AND STORMS WILL LINGER WELL INTO THE EVENING HOURS. THUS...HAVE INCLUDED CHANCE POPS FOR MUCH OF THE FORECAST AREA. STRONG MID/UPPER LEVEL RIDGE THAT HAS BEEN ANCHORED ACROSS THE AREA THE LAST SEVERAL DAYS IS FORECAST TO TEMPORARILY WEAKEN EARLY NEXT WEEK...WITH SERIES OF SHORTWAVE TROUGHS DROPPING SOUTHWARD OVER THE EASTERN SEABOARD AND CARVING A LARGE SCALE TROUGH. ALTHOUGH TEMPERATURES WILL REMAIN ABOVE NORMAL...READINGS WILL NOT BE AS OPPRESSIVE WITH FORECAST HIGHS IN THE LOWER TO MID 90S. STRONGEST DYNAMICS ARE FORECAST TO ARRIVE MONDAY. THIS COUPLED WITH CONTINUED HIGH ATMOSPHERIC MOISTURE WILL WARRANT LIKELY POPS ACROSS THE FORECAST AREA. DRIER AIR WILL BEGIN TO WORK INTO THE AREA FROM THE NORTH ON TUESDAY AS LONG-WAVE TROUGH EXITS OFFSHORE AND HIGH PRESSURE RIDGE SLOWLY RETURNS. HAVE INCLUDED CHANCE POPS ACROSS NORTHEAST DECREASING TO SLIGHT CHANCE POPS ACROSS SOUTHEAST GEORGIA. HOT READINGS WILL RETURN WEDNESDAY WITH UPPER 90S COMMON ACROSS THE INTERIOR. HAVE MAINTAINED LIMITED RAIN CHANCES WITH HIGHEST /30 PERCENT POPS/ RESERVED FOR INTERIOR NORTHEAST FLORIDA. .LONG TERM...HOT TEMPERATURES WITH LIMITED RAIN CHANCES ARE FORECAST THURSDAY. RAIN CHANCES WILL INCREASE FRIDAY AND INTO NEXT WEEKEND AS HIGH PRESSURE RIDGE ONCE AGAIN WEAKENS ACROSS THE FORECAST AREA. LOW PRESSURE SYSTEM WELL EAST OF THE WINDWARD ISLANDS IS FORECAST TO STRENGTHEN INTO A TROPICAL CYCLONE DURING THE NEXT 48 HOURS AS IT TRACKS TOWARDS THE WEST-NORTHWEST. THERE IS MUCH UNCERTAINTY WITH THIS FEATURE AND INTERESTS ARE URGED TO CLOSELY MONITOR THE LATEST FORECAST. && .AVIATION...HAVE TSRA IN ALL TAFS TIL AROUND 00Z AS SCATTERED THUNDERSTORMS CONTINUE TO DEVELOP THIS AFTERNOON. PATCHY FOG POSSIBLE LATE TONIGHT/EARLY MONDAY WITH MVFR VSBYS MAINLY AT GNV AND VQQ. && .MARINE...SW WINDS WILL INCREASE DUE TO NIGHTLY SURGE AGAIN TONIGHT APPROACHING SCEC. NO HEADLINES FOR NOW. WINDS WILL CONTINUE TO BECOME S TO SE DUE TO AFTERNOON SEABREEZES. SEAS WILL REMAIN IN 2 TO 4 FOOT RANGE. RIP CURRENTS: LOW RISK WILL CONTINUE THROUGH MONDAY. && .PRELIMINARY POINT TEMPS/POPS... AMG 76 96 75 97 / 40 60 30 20 SSI 80 91 79 91 / 30 50 40 20 JAX 77 93 75 94 / 30 60 30 30 SGJ 78 91 77 92 / 20 60 30 30 GNV 76 92 75 93 / 40 60 20 40 OCF 75 93 75 93 / 30 50 20 50 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...NONE. GA...NONE. AM...NONE. && ZAPPE/ZIBURA/KEEGAN
Hazardous weather outlook, Jul 31, 5:38 AM EDT, 10 hours 15 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE JACKSONVILLE FL 538 AM EDT SUN JUL 31 2011 FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-010945- HAMILTON-SUWANNEE-COLUMBIA-BAKER-NASSAU-DUVAL-UNION-BRADFORD-CLAY- ST JOHNS-GILCHRIST-ALACHUA-PUTNAM-FLAGLER-MARION-COFFEE- JEFF DAVIS-BACON-APPLING-WAYNE-ATKINSON-WARE-PIERCE-BRANTLEY- INLAND GLYNN-COASTAL GLYNN-ECHOLS-CLINCH-CHARLTON-INLAND CAMDEN- COASTAL CAMDEN- 538 AM EDT SUN JUL 31 2011 ...HEAT INDICES 105 TO 110 TODAY... ...A FEW STORMS MAY BECOME STRONG TODAY AND TOMORROW.... THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA. .DAY ONE...TODAY AND TONIGHT... SCATTERED THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND EARLY EVENING...PARTICULARLY BETWEEN I-75 AND I-95. ISOLATED STRONG WIND GUSTS WILL BE POSSIBLE WITH THESE STORMS. HIGHS IN THE MID TO UPPER 90S WILL RESULT IN HEAT INDICES BETWEEN 105 AND 110 DEGREES TODAY. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY... THUNDERSTORMS WILL BECOME NUMEROUS ON MONDAY. A FEW OF THESE STORMS COULD PRODUCE DAMAGING WIND GUSTS. THUNDERSTORM CHANCES WILL BE LOWER THAN NORMAL TUESDAY THROUGH SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT REQUESTED AT THIS TIME. FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN JACKSONVILLE WEBSITE ON THE INTERNET AT WEATHER.GOV/JAX. JDS
In the hours before
Special weather statement, Jul 31, 2:45 PM EDT, 1 hour 8 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, Jul 31, 3:37 PM EDT, 16 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, Jul 31, 3:39 PM EDT, 14 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, Jul 31, 3:40 PM EDT, 13 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, Jul 31, 3:49 PM EDT, 4 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, Jul 31, 3:50 PM EDT, 3 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
350 PM EDT SUN JUL 31 2011
FLZ040-312030-
MARION-
350 PM EDT SUN JUL 31 2011
...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR SOUTHERN MARION
COUNTY FOR STRONG WINDS AND EXCESSIVE LIGHTNING VALID UNTIL 430 PM
EDT...
AT 350 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG
THUNDERSTORMS CENTERED 5 MILES SOUTH OF OCALA AIRPORT...OR 8 MILES
SOUTHWEST OF OCALA...STATIONARY. THESE STRONG THUNDERSTORMS WILL ALSO
AFFECT AREAS AROUND SUMMERFIELD...SILVER SPRINGS SHORES...SANTOS...
OCALA AIRPORT AND BELLEVIEW THROUGH 430 PM EDT. EXCESSIVE
CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH CAN BE
EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE. HEAVY RAINFALL WILL
PRODUCE PONDING OF WATER ON ROADWAYS AND MINOR FLOODING OF LOW-LYING
AREAS.
REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY
EMERGENCY MANAGEMENT.
LAT...LON 2896 8232 2897 8232 2901 8240 2921 8229
2914 8197 2895 8203
TIME...MOT...LOC 1950Z 033DEG 2KT 2910 8222
STRUBLEThe office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 10:39 PM EDT | Special Weather Statement | JAX | Marion | 51 min |
| Jul 31, 2:06 PM EDT | Special Weather Statement | JAX | Gilchrist | 24 min |
| Jul 31, 2:13 PM EDT | Special Weather Statement | JAX | Saint Johns | 32 min |
| Jul 31, 2:14 PM EDT | Special Weather Statement | JAX | Duval | 31 min |
| Jul 31, 2:25 PM EDT | Special Weather Statement | JAX | Marion | 35 min |
| Jul 31, 2:45 PM EDT | Special Weather Statement | JAX | Duval | 45 min |
| Jul 31, 3:37 PM EDT | Special Weather Statement | JAX | Saint Johns | 38 min |
| Jul 31, 3:39 PM EDT | Special Weather Statement | JAX | Citrus | 51 min |
| Jul 31, 3:40 PM EDT | Special Weather Statement | JAX | Saint Johns | 35 min |
| Jul 31, 3:49 PM EDT | Special Weather Statement | JAX | Baker | 26 min |
| Jul 31, 3:50 PM EDT | Special Weather Statement | JAX | Marion | 40 min |
| Jul 31, 4:09 PM EDT | Special Weather Statement | JAX | Clay | 36 min |
| Jul 31, 4:10 PM EDT | Areal Flood Advisory | JAX | Marion | 2 hr |
| Jul 31, 4:29 PM EDT | Areal Flood Warning | JAX | Marion | 90 min |
| Jul 31, 4:36 PM EDT | Special Weather Statement | JAX | Putnam | 39 min |
| Jul 31, 4:42 PM EDT | Special Weather Statement | JAX | Nassau | 33 min |
| Jul 31, 4:52 PM EDT | Severe Thunderstorm Warning | JAX | Columbia | 23 min |
| Jul 31, 5:10 PM EDT | Special Weather Statement | JAX | Nassau | 50 min |
| Jul 31, 5:21 PM EDT | Severe Thunderstorm Warning | JAX | Columbia | 24 min |
| Jul 31, 6:20 PM EDT | Special Weather Statement | JAX | Columbia | 40 min |
| Jul 31, 3:58 PM EDT | Special Weather Statement | JAX | Camden | 47 min |
| Jul 31, 6:41 PM EDT | Special Weather Statement | JAX | Brantley | 64 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2011Every severe thunderstorm warning in 2011
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.