Alert archive / Florida / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 124, NWS Jacksonville, FL

June 18, 2001Alachua County, Putnam County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 18, 2001, 6:27 PM EDT for Alachua County, Putnam County, Florida. It was in force for 63 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jun 18, 2001, 6:27 PM EDT (22:27 UTC)
Expired
Jun 18, 2001, 7:30 PM EDT
In force
63 min
Issued by
NWS Jacksonville, FL
Area
Whole counties

Counties Alachua County, FL, Putnam County, FL

The radar

The Jacksonville radar (KJAX), 100 km from the middle of the area, began a volume at 22:28 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.

What was reported inside it

TimeReportWhereRemark
Jun 18, 6:30 PM EDTHail 0.75Palatka, FL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 10.5 hours before the alert went out and 101 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 2001-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1481 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 2001-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 76 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
1481 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
552 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
76 m²/s²
0-3 km storm-relative helicity
92 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 18, 3:15 PM EDT, 3 hours 12 minutes earlier.

Area forecast discussion, Jun 18, 3:15 PM EDT, 3 hours 12 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
315 PM EDT MON JUN 18 2001

CURRENTLY...WATER VAPOR WATER VAPOR SATELLITE LOOP AND 250
STREAMLINES SHOWED S SHORT WAVE GENERATING SHOWERS AND
THUNDERSTORMS AS IT ROTATE AROUND A RIDGE WHICH WAS OVER THE WESTERN
ATLANTIC OFF THE SOUTHEASTERN UNITED STATES. THIS SHORT WAVE WILL
MOVE OUT OF THE AREA LATER TONIGHT SO THE SHOWERS AND THUNDERSTORMS
OVER THAT AREA SHOULD BEGIN TO DIMINISH BY EARLY EVENING.

FOR THE REMAINDER OF THIS PACKAGE A GOOD EASTERLY TO SOUTHEASTERLY
SURFACE FLOW...COMBINED WITH SEA BREEZE INTERACTION SHOULD PRODUCE
MORNING CLOUDINESS ALONG COASTAL AREAS AND A CHANCE TO GOOD CHANCE
OF AFTERNOON SHOWERS AND THUNDERSTORMS. AFTERNOON MAX TEMPERATURES
SHOULD RANGE IN THE UPPER 80S AND LOWER 90S WITH OVERNIGHT LOWS IN
THE 70S.

PRELIM
AMG 70/89/71/91 2534
SSI 73/83/74/84 3434
JAX 72/86/72/86 3533
GNV 70/90/71/91 3533 33

.JAX...
.FL...NONE.
.GA...NONE.

SCOTT

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 1:55 PM EDTSevere Thunderstorm WarningJAXNassau50 min
Jun 18, 5:02 PM EDTSevere Thunderstorm WarningJAXAlachua43 min
Jun 18, 5:32 PM EDTSevere Thunderstorm WarningJAXMarion43 min
Jun 18, 5:52 PM EDTSevere Thunderstorm WarningJAXAlachua38 min
Jun 18, 6:15 PM EDTSevere Thunderstorm WarningJAXMarion60 min
Jun 18, 6:48 PM EDTSevere Thunderstorm WarningJAXBradford, Clay42 min
Jun 18, 7:12 PM EDTSevere Thunderstorm WarningJAXMarion48 min
Jun 18, 2:13 PM EDTSevere Thunderstorm WarningJAXAtkinson47 min

Nearby

Severe Thunderstorm Warnings in Florida, 2001Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.