Alert archive / Florida / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 302, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 21, 2008, 5:05 PM EDT for Bradford County, Union County, Florida. It was in force for 40 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 21, 2008, 5:05 PM EDT (21:05 UTC)
- Expired
- Jul 21, 2008, 5:45 PM EDT
- In force
- 40 min
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
Counties Bradford County, FL, Union County, FL
The radar
The Jacksonville radar (KJAX), 77 km from the middle of the area, began a volume at 21:05 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
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 9.1 hours before the alert went out and 200 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
- 1192 J/kg
- Mixed-layer CIN
- -84 J/kg
- Mixed-layer LCL
- 1128 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 35 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 21, 2:45 PM EDT, 2 hours 20 minutes earlier.
Area forecast discussion, Jul 21, 2:45 PM EDT, 2 hours 20 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSONVILLE FL 245 PM EDT MON JUL 21 2008 .SHORT TERM...TONIGHT THROUGH THURSDAY... WARM AND HUMID CONDITIONS WILL STICK WITH US OVERNIGHT. TEMPS WILL REMAIN IN THE 80S THROUGH MUCH OF THE EVENING BEFORE BOTTOMING OUT ONLY IN THE MID 70S TOWARD DAYBREAK. WE WILL CRUISE INTO THE 90S ONCE AGAIN ON TUESDAY. MAXIMUM HEAT INDICES WILL RUN FROM 100 TO 105 DEGREES...WITH THE HIGHEST VALUES OVER SOUTHEAST GEORGIA. MORE MOISTURE IN THE COLUMN TOMORROW SHOULD RESULT IN AT LEAST SCATTERED THUNDERSTORM ACTIVITY. FOCUS WILL LIKELY EXIST ALONG SEABREEZE BOUNDARIES...BUT GFS DEPICTS AN AMPLIFIED 850MB TROUGH DIPPING THROUGH THE AREA LATE IN THE AFTERNOON. THIS SHOULD NOT ONLY ENHANCE ACTIVITY BUT ALSO MAINTAIN IT THROUGH MUCH OF THE EVENING HOURS. WEDNESDAY AND THURSDAY...ALTHOUGH THE LOCAL FORECAST AREA WILL REMAIN JUST SOUTH OF THE REGION OF UPPER LEVEL HEIGHT FALLS ASSOCIATED WITH LONGWAVE TROUGH DIGGING THROUGH THE GREAT LAKES REGION...DEEP CYCLONIC FLOW WILL EXIST OVER THE REGION. CYCLONIC FLOW COMBINED WITH SUFFICIENT INSTABILITY AND MOISTURE WILL LEAD TO SCATTERED TO NUMEROUS AFTERNOON AND EVENING THUNDERSTORMS ON BOTH WEDNESDAY AND THURSDAY. PRECIP AND CLOUDS ON WEDNESDAY AND THURSDAY SHOULD HELP TO LIMIT MAX TEMPS A BIT...CLOSER TO 90 BUT REMAINING HUMID. .LONG TERM...FRIDAY THROUGH MONDAY... THE OVERALL WEATHER PATTERN WILL CHANGE VERY LITTLE AS BOTH SURFACE AND UPPER TROUGHS ARE PROGGED TO REMAIN DRAPED DOWN THE EAST COAST OF THE UNITED STATES. THIS WILL RESULT IN AT LEAST SCATTERED COVERAGE OF AFTERNOON AND EVENING THUNDERSTORMS EACH DAY OF THE EXTENDED. TEMPERATURES WILL CHECK IN AROUND NORMAL LEVELS...MAXES IN THE LOW 90S AND MINS IN THE LOW 70S. .AVIATION...HAVE VCTS AT NE FL TAF SITES INTO THE EVENING HOURS WITH CB MENTIONED AT KSSI. MAY NEED TO INSERT A TEMPO TSRA AT KGNV SHORTLY. HAZE CONTINUES TO PLAGUE THE AREA WITH TEMPORARY VSBY REDUCTIONS INTO THE MVFR RANGE STILL POSSIBLE. && .MARINE...GENERALLY QUIET CONDITIONS WILL CONTINUE WITH NOCTURNAL WIND SURGES MOSTLY STAYING BELOW SMALL CRAFT CAUTION CRITERIA. && .PRELIMINARY POINT TEMPS/POPS... AMG 74 98 72 92 / 10 30 30 50 SSI 78 91 76 88 / 10 30 20 40 JAX 74 95 73 90 / 20 60 20 50 SGJ 75 92 74 90 / 10 50 30 50 GNV 72 94 72 91 / 10 40 30 60 OCF 71 93 72 89 / 10 40 30 50 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...NONE. GA...NONE. AM...NONE. && SHULER/CARROLL/KEEGAN
Hazardous weather outlook, Jul 21, 4:35 AM EDT, 12 hours 30 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE JACKSONVILLE FL 435 AM EDT MON JUL 21 2008 FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-221000- 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- 435 AM EDT MON JUL 21 2008 THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA. .DAY ONE...TODAY AND TONIGHT... ...VERY HOT CONDITIONS TODAY WITH HEAT INDICES AROUND 105 DEGREES... ...ISOLATED STRONG THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING... AFTERNOON MAXIMUM TEMPERATURES IN THE 95 TO 100 DEGREE RANGE WILL LEAD TO HEAT INDICES AROUND 105 DEGREES...MAINLY ACROSS INLAND PORTIONS OF SOUTHEAST GEORGIA. PLEASE USE EXTRA CAUTION IF ENGAGING IN OUTDOOR ACTIVITIES TODAY. ISOLATED STRONG THUNDERSTORMS WILL BE POSSIBLE LATER THIS AFTERNOON AND EVENING...MAINLY ACROSS NORTHEAST FLORIDA. GUSTY WINDS UP TO 50 MPH...LOCALLY HEAVY RAINFALL AND EXCESSIVE CLOUD TO GROUND LIGHTNING WILL BE POSSIBLE. STORM MOTION WILL GENERALLY BE TOWARD THE EAST AT 5 TO 10 MPH OR BECOME ERRATIC DUE TO OUTFLOW AND SEA BREEZE INTERACTIONS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY... SCATTERED TO NUMEROUS THUNDERSTORMS ARE EXPECTED THROUGH THE PERIOD WITH STRONG THUNDERSTORMS POSSIBLE AT TIMES WITH GUSTY WINDS TO 50 MPH...LOCALLY HEAVY RAINFALL AND EXCESSIVE CLOUD TO GROUND LIGHTNING. .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.
In the hours before
Special weather statement, Jul 21, 4:11 PM EDT, 54 minutes before
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</html>Local storm report, Jul 21, 4:51 PM EDT, 14 minutes before
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</html>The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 4:37 PM EDT | Areal Flood Advisory | JAX | Clay | 53 min |
| Jul 21, 4:56 PM EDT | Special Marine Warning | JAX | 61 min | |
| Jul 21, 5:26 PM EDT | Areal Flood Advisory | JAX | Bradford, Clay, Columbia, Union | 64 min |
| Jul 21, 5:36 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Columbia, Union | 18 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2008Every severe thunderstorm warning in 2008
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.