An unstable and moist airmass was over the local area under a very slow steering motion. Precipitable water was near 2 inches.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS JAX wrote it up.
An unstable and moist airmass was over the local area under a very slow steering motion. Precipitable water was near 2 inches. When the sea breezes merged just west of the St. Johns River and east of Highway 301 in northeast Florida during the late afternoon and evening, numerous storms erupted. Heavy rainfall caused localized flooding, and one severe storm developed that produce quarter size hail over Putnam county.
The local office's own words before the first event, 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 the first event at May 31, 1:30 PM EST, 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSONVILLE FL 230 PM EDT MON MAY 31 2010 .SYNOPSIS...UPPER LOW OVER TN CONTINUES TO WEAKEN AS TROF CONTINUES INTO THE N CENTRAL GOMEX. CONVECTION HAS DEVELOPED MOSTLY ALONG THE E COAST SEABREEZE WITH ADDITIONAL ENHANCEMENT IN BOTH COVERAGE AND INTENSITY ACROSS EXTREME SE GA. LITTLE IN THE WAY OF CONVECTION IS PRESENT OVER W AREAS...BUT STORMS ARE FIRING OVER THE TAE AREA IN RESPONSE TO UPSTREAM VORTICITY MAX. OUTSIDE OF RAIN AREAS... TEMPERATURES ARE IN THE UPPER 80S. .SHORT TERM...VORTICITY MAX TO THE W OF THE AREA WILL MOVE ENE AND MAY BRING AN INCREASE IN TSTM COVERAGE TO SE GA BEFORE DAYTIME HEATING IS LOST. SOME OF THESE STORMS MAY BE STRONG. PATCHES TO AREAS OF FOG WILL DEVELOP AFTER MIDNIGHT...ESPECIALLY IN RECENT RAIN AREAS. UPPER LOW N OF THE AREA WILL BECOME COMPLETELY ABSORBED IN WEAKENING TROF ON TUE. AS A RESULT...CONVECTION WILL BECOME EVEN MORE DIURNAL IN NATURE. IN ADDITION...SFC FLOW WILL BECOME MORE S TO SW...WHICH SHOULD PREVENT MOST MORNING COASTAL SHOWERS FROM MAKING IT ONSHORE THE ATLANTIC COAST. AS HEIGHTS RISE A BIT...MAX TEMPS WILL FOLLOW SUIT WITH MORE LOCATIONS HITTING 90. AS LOW-LEVEL FLOW BECOMES MORE SW...THERE WILL BE AN INCREASING CHANCE OF MORNING CONVECTION OVER OUR SW COUNTIES. THIS WILL DEVELOP AND SPREAD ACROSS THE LAND AREAS THRU THE AFTERNOON... ENCOUNTERING THE ATLANTIC SEABREEZE. .LONG TERM...DIURNAL CONVECTIVE PATTERN WILL CONTINUE. BROAD E U.S. TROF WILL GRADUALLY SHIFT E WITH RISING HEIGHTS. THIS...ALONG WITH INCREASING SW FLOW...WILL LEAD TO WARMER TEMPERATURES BY SUN AND MON...WITH READINGS POSSIBLY 5 TO 7 DEGREES ABOVE NORMAL. GFS DOES KEEP A CUT OFF UPPER LOW OVER THE GOMEX...AND THIS SHOULD CONTINUE TO FEED ENUF MOISTURE INTO THE AREA FOR DAYTIME STORMS TO PERSIST. && .AVIATION...EAST COAST SEABREEZE HAS BEEN VERY ACTIVE THIS MORNING AS IT MOVED THROUGH...BUT ACTIVITY HAS LARGELY SHIFTED WEST OF THE ATLANTIC TERMINALS. SHOULD THUNDERSTORMS ACQUIRE 40K FOOT TOPS LATER TODAY...ACTIVITY COULD PUSH BACK TOWARD THE COAST IN DEVELOPING SOUTHWEST STEERING FLOW. FOR THIS REASON...HAVE LEFT IN VCTS FOR THESE SITES THROUGH 00Z. OTHERWISE...TSRA WILL BE MOSTLY CONFINED TO VQQ FOR THE SHORT TERM AND GNV LATER THIS AFTERNOON. MAY NEED AMENDMENTS FOR MORE SUBSTANTIAL ACTIVITY BUT FOR NOW HAVE KEPT TEMPOS IN MVFR RANGE. HAVE ALSO INCLUDED MVFR VSBY AND CIGS FOR INTERIOR SITES AS LOCAL GFE FOG TOOLS ARE HITTING POTENTIAL HARD. && .MARINE...SEAS CONTINUING TO RUN AROUND A FOOT BELOW WAVEWATCH GUIDANCE AND WILL CONTINUE THIS TREND THROUGH THE FIRST 24 HOURS OF THE FORECAST. THIS WILL RESULT IN CONDITIONS REMAINING BELOW SCEC FOR THIS FORECAST ISSUANCE. FLOW TO BECOME MORE SOUTHERLY TONIGHT AND TUESDAY AND THIS LOOKS TO PERSIST THROUGH MUCH OF THE WEEK. NOCTURNAL SURGES WILL TAKE WINDS TO THE CUSP OF SCEC BUT THESE WILL BE VERY SHORT TERM EVENTS AND NO FLAGS ARE ANTICIPATED AT THIS TIME. WITH SEAS DIMINISHING THROUGH THE WEEK...LOOKS AS THOUGH RIP CURRENT RISK WILL RETURN TO LOW BY TUESDAY AFTERNOON. && .PRELIMINARY POINT TEMPS/POPS... AMG 68 90 68 90 / 40 50 30 50 SSI 73 85 73 86 / 40 30 30 40 JAX 70 89 70 88 / 40 40 30 50 SGJ 72 87 72 85 / 40 40 30 40 GNV 68 91 68 90 / 20 40 20 50 OCF 69 91 69 90 / 20 50 30 50 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...NONE. GA...NONE. AM...NONE. && CARROLL/DEESE/MCALLISTER
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE JACKSONVILLE FL 1020 AM EDT MON MAY 31 2010 FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-011000- ALACHUA-APPLING-ATKINSON-BACON-BAKER-BRADFORD-BRANTLEY- CAMDEN (COASTAL)-CAMDEN (INLAND)-CHARLTON-CLAY-CLINCH-COFFEE- COLUMBIA-DUVAL-ECHOLS-FLAGLER-GILCHRIST-GLYNN (COASTAL)- GLYNN (INLAND)-HAMILTON-JEFF DAVIS-MARION-NASSAU-PIERCE-PUTNAM- ST JOHNS-SUWANNEE-UNION-WARE-WAYNE- 1020 AM EDT MON MAY 31 2010 THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA. .DAY ONE...TODAY AND TONIGHT... ...MODERATE RISK OF RIP CURRENTS AT AREAS BEACHES TODAY... ...ISOLATED STRONG TO SEVERE STORMS POSSIBLE TODAY WITH LOCALLY HEAVY RAINFALL.... SCATTERED TO NUMEROUS THUNDERSTORMS ARE EXPECTED THIS AFTERNOON ACROSS NORTHEAST FLORIDA AND SOUTHEAST GEORGIA. THE STRONGEST STORMS WILL PRODUCE FREQUENT LIGHTNING...GUSTY WINDS...LOCALLY HEAVY RAINFALL AND SMALL HAIL. A FEW STORMS MAY BECOME SEVERE... PARTICULARLY ACROSS SOUTHEAST GEORGIA AND ALONG THE ATLANTIC COAST SEABREEZE. STORM MOTION WILL BE TO THE NORTHEAST AT 10 MPH...AND STORMS THAT DEVELOP OVER INLAND AREAS WILL LIKELY MOVE BACK TOWARD THE ATLANTIC COAST BY LATE AFTERNOON AND EARLY EVENING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY... SCATTERED THUNDERSTORMS ARE EXPECTED EACH AFTERNOON ACROSS NORTHEAST FLORIDA AND SOUTHEAST GEORGIA. THE STRONGEST STORMS WILL PRODUCE FREQUENT LIGHTNING...GUSTY WINDS...HEAVY RAINFALL AND POSSIBLY SMALL HAIL. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE REQUESTED TO SELF-ACTIVATE IF WARNINGS ARE ISSUED. FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN JACKSONVILLE WEBSITE ON THE INTERNET AT WEATHER.GOV/JAX. ECZ/SEC
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
225 PM EDT MON MAY 31 2010
FLZ024-311915-
NASSAU-
225 PM EDT MON MAY 31 2010
...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR CENTRAL NASSAU
COUNTY FOR STRONG WINDS...SMALL HAIL AND EXCESSIVE LIGHTNING VALID
UNTIL 315 PM EDT...
AT 225 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED 4 MILES NORTHEAST OF CALLAHAN...MOVING
NORTHEAST AT 10 MPH. THIS STRONG THUNDERSTORM WILL ALSO AFFECT AREAS
AROUND CALLAHAN THROUGH 315 PM EDT. HAIL UP TO THREE QUARTER INCH IN
DIAMETER...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 3074 8186 3071 8165 3058 8172 3050 8182
3053 8188
TIME...MOT...LOC 1825Z 209DEG 8KT 3062 8179
DEESEThe Jacksonville radar (KJAX), 34 km away, was scanning. The volume nearest the first event began at 18:58 UTC.
2 heavy rain, 1 hail. Local standard time, as filed.
A spotter measured 4.25 inches of rainfall in 1 hour. The measurement was taken at the intersection of Blanding Blvd. and Aurora Blvd in Orange Park.
A store clerk along U.S. Highway 17 southwest of San Mateo reported quarter size hail. The hail lasted for a short duration. Numerous power outages were reported in the area. The time of the event was based on radar imagery.
A hourly rainfall amount of 2.5 inches was measured in southeast Palm Coast between 10 pm and 11 pm. There was also some street flooding on the northbound lane of U.S. Highway 1 in Bunnell.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2010Every state in 2010This day in weather historyWarnings in Florida, May 2010
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 223158, 223157, 223159.