Alert archive / Florida / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 30, NWS Tampa Bay, FL

July 1, 2015Highlands County, Polk County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Jul 1, 2015, 6:30 PM EDT for Highlands County, Polk County, Florida. It was in force for 30 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 1, 2015, 6:30 PM EDT (22:30 UTC)
Expired
Jul 1, 2015, 7:00 PM EDT
In force
30 min
Issued by
NWS Tampa Bay, FL
Area
Storm-based polygon

Counties Highlands County, FL, Polk County, FL

The radar

The Tampa radar (KTBW), 87 km from the middle of the area, began a volume at 22:33 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

Tampa Bay, FL (KTBW), launched 12:00Z, 10.5 hours before the alert went out and 87 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, Tampa Bay, FL at 12:00Z on 2015-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2044 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, Tampa Bay, FL at 12:00Z on 2015-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 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
2044 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
1061 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
36 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 Tampa Bay, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 1, 3:14 PM EDT, 3 hours 16 minutes earlier.

Area forecast discussion, Jul 1, 3:14 PM EDT, 3 hours 16 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
314 PM EDT WED JUL 1 2015

.SYNOPSIS...
ALOFT - A STOUT RIDGE SPRAWLED OUT FROM THE GREAT BASIN/ 4
CORNERS REGION...TROUGHING WAS OVER THE EASTERN CONUS WITH AN AXIS
FROM JAMES BAY TO THE SOUTHEAST U.S. COAST...AND A RIDGE FROM THE
ATLANTIC REACHED ACROSS THE BAHAMAS AND THE FLORIDA KEYS TO THE
SOUTH-CENTRAL GULF OF MEXICO. SURFACE - A WAVY FRONTAL BOUNDARY
WAS STRUNG OUT FROM THE CENTRAL ROCKIES THROUGH THE OHIO VALLEY
THEN UP TO THE SAINT LAWRENCE VALLEY. ATLANTIC HIGH PRESSURE
RIDGED ACROSS CENTRAL FL TO MOST OF THE GULF OF MEXICO.

&&

.SHORT TERM (REST OF TODAY-THURSDAY)...
THE WESTERN RIDGE REMAINS CENTERED IN PLACE AS IT SPREADS OUT
FROM THE PACIFIC COAST TO SOUTHERN PLAINS. THE EASTERN TROUGINESS
RESIDES IN PLACE WITH SHORT WAVE TROUGHS ROTATING THROUGH IT/S
BASE...BRUSHING NORTHERN FL AT TIMES. THE UPPER RIDGE CONTINUES
FROM THE ATLANTIC INTO THE GULF... MEANDERING ACROSS FL. THE
FRONTAL BOUNDARY REMAINS OVER THE CENTRAL AND EASTERN CONUS WITH
LITTLE MOVEMENT. THE SURFACE RIDGE REACHES FROM THE ATLANTIC...
ACROSS FL BETWEEN BETWEEN TAMPA BAY AND CHARLOTTE HARBOR...TO THE
WESTERN GULF OF MEXICO.

DEEP LAYER RIDGING...ALOFT AND SURFACE...ROUGHLY BISECTING THE AREA
FROM EAST TO WEST PROVIDES A SPLIT FLOW PATTERN. THERE WILL BE
SOUTHWEST TO WEST WINDS NORTH OF TAMPA BAY WITH SOUTHERLY TO
SOUTHEASTERLY WINDS...BUT SHIFTING TO ONSHORE IN AFTERNOON SEA
BREEZES...SOUTH OF TAMPA BAY. THE ATMOSPHERE WILL BE MOIST WITH
MODEL PWAT VALUES RUNNING 1.6 TO ALMOST 1.9 INCHES. THIS WILL BE
ENOUGH FOR ISOLATED TO SCATTERED BUT OCCASIONALLY NUMEROUS SHOWERS
AND THUNDERSTORMS. EXPECT LIMITED LATE NIGHT CONVECTION ON THE
GULF THAT DRIFTS ON SHORE LATE IN THE MORNING...MORE SO IN THE
NORTH DUE TO PREVAILING SW AND WEST WINDS. ACTIVITY INCREASES IN
THE LATE AFTERNOON INLAND...CLOSER TO THE EAST COAST IN THE NORTH
AND CLOSER TO THE GULF IN THE SOUTH...WHERE IT MAXES OUT DUE TO
SEA BREEZE INTERACTIONS. TEMPERATURES STAY NEAR NORMAL TO SLIGHTLY
ABOVE BY A DEGREE OR TWO.

.LONG TERM (FRIDAY THROUGH NEXT WEDNESDAY)...
A PERSISTENT UPPER LEVEL SYNOPTIC PATTERN WILL CONTINUE THROUGH
MUCH OF THE UPCOMING HOLIDAY WEEKEND WITH LARGE SCALE RIDGING OVER
THE INTER-MOUNTAIN WEST AND DOWNSTREAM TROUGHING OVER THE EASTERN
CONUS. OUR FORECAST AREA SHOULD GENERALLY RESIDE JUST SOUTH OF THE
MAIN INFLUENCE OF THIS TROUGH...KEEPING MORE TYPICAL SUMMER
CONDITIONS IN OUR FORECAST. THE MAIN HAZARDS THROUGH THE PERIOD
WILL BE SCATTERED DIURNAL STORMS...ALTHOUGH THE SURFACE RIDGE
PATTERN ACROSS THE CENTRAL PENINSULA WILL KEEP THE STORM PATTERNS
EACH DAY RATHER INDISTINCT. WITH MANY PLANNING OUTDOOR ACTIVITIES
THIS WEEKEND... JUST EXPECT AND PLAN TO DODGE A STORM OR TWO EACH
DAY...IN ALMOST ANY LOCATION.

TEMPERATURES WILL BE NEAR NORMAL...WITH LOWER 90S COMMON DURING THE
DAY AND HEAT INDICES WITHIN A FEW DEGREES EITHER SIDE OF 100.
ANOTHER ANY SUMMER STORMS CAN BRIEFLY BECOME STRONG WITH FREQUENT
LIGHTNING AND GUSTY WINDS...THERE ARE NO SYNOPTIC INFLUENCES SEEN
THAT WOULD SUGGEST LIKELY STRONG TO SEVERE STORMS ANY OF THE
UPCOMING HOLIDAY WEEKEND DAYS.

&&

.AVIATION...
01/18Z-02/18Z. CONVECTION HAS CLEARED THE NORTHERN TERMINALS BUT
WILL KEEP VCTS INTO MID/LATE AFTERNOON. EXPECT SHRA/TSRA TO SPREAD
INTO OR EAST OF SOUTHERN TERMINAL LATER AND THEN POSSIBLY DRIFT
BACK WEST IN THE EVENING...HAVE SOME TEMPO MVFR AND CARRIED VCTS
INTO THE EVENING. VFR THROUGH REST OF PERIOD WITH VCSH NEAR THE
END.

&&

.MARINE...
A BROAD RIDGE OF HIGH PRESSURE WILL BISECT CENTRAL FL FROM EAST
TO WEST WITH RATHER MODEST WINDS AND SEAS...NO MORE THAN 15 KNOTS
AND LESS THAN 4 FEET. MAIN CONCERN WILL BE ISOLATED TO SCATTERED
SHOWERS AND THUNDERSTORMS. NO HIGHLIGHTS ARE EXPECTED THROUGH THE
PERIOD.

&&

.FIRE WEATHER...
A MOIST AIRMASS WILL PRECLUDE ANY LOW HUMIDITY CONCERNS. HOWEVER
THERE WILL BE LIGHTNING FROM THUNDERSTORMS.

&&

.PRELIMINARY POINT TEMPS/POPS...
TPA  78  93  78  92 /  10  20  20  40
FMY  76  94  76  94 /  40  40  30  40
GIF  75  95  76  95 /  20  40  40  50
SRQ  76  92  78  91 /  10  20  20  30
BKV  72  93  72  93 /  10  30  20  40
SPG  80  92  80  92 /  10  20  20  30

&&

.TBW WATCHES/WARNINGS/ADVISORIES...
FL...NONE.
GULF WATERS...NONE.
&&

SYNOPSIS/SHORT TERM/AVIATION/MARINE/FIRE WEATHER...09/RUDE
LONG TERM/DECISION SUPPORT SERVICES...14/MROCZKA
Hazardous weather outlook, Jul 1, 4:56 AM EDT, 13 hours 34 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
456 AM EDT WED JUL 1 2015

FLZ043-050-052-056-057-061-139-142-148-149-151-155-160-162-165-
239-242-248-249-251-255-260-262-265-GMZ830-836-850-853-856-870-
873-876-020900-
SUMTER-PINELLAS-POLK-HARDEE-HIGHLANDS-DESOTO-COASTAL LEVY-
COASTAL CITRUS-COASTAL HERNANDO-COASTAL PASCO-
COASTAL HILLSBOROUGH-COASTAL MANATEE-COASTAL SARASOTA-
COASTAL CHARLOTTE-COASTAL LEE-INLAND LEVY-INLAND CITRUS-
INLAND HERNANDO-INLAND PASCO-INLAND HILLSBOROUGH-INLAND MANATEE-
INLAND SARASOTA-INLAND CHARLOTTE-INLAND LEE-TAMPA BAY WATERS-
CHARLOTTE HARBOR AND PINE ISLAND SOUND-
COASTAL WATERS FROM TARPON SPRINGS TO SUWANNEE RIVER FL OUT 20 NM-
COASTAL WATERS FROM ENGLEWOOD TO TARPON SPRINGS FL OUT 20 NM-
COASTAL WATERS FROM BONITA BEACH TO ENGLEWOOD FL OUT 20 NM-
WATERS FROM TARPON SPRINGS TO SUWANNEE RIVER FL OUT 20 TO 60 NM-
WATERS FROM ENGLEWOOD TO TARPON SPRINGS FL OUT 20 TO 60 NM-
WATERS FROM BONITA BEACH TO ENGLEWOOD FL OUT 20 TO 60 NM-
456 AM EDT WED JUL 1 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WEST CENTRAL AND SOUTHWEST
FLORIDA.

.DAY ONE...TODAY AND TONIGHT.

...THUNDERSTORM IMPACT...
THUNDERSTORMS ARE EXPECTED. THUNDERSTORMS THAT DEVELOP WILL BE
CAPABLE OF PRODUCING STRONG GUSTY WINDS...LOCALLY HEAVY RAINS...
AND FREQUENT DEADLY LIGHTNING STRIKES.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

...THUNDERSTORM IMPACT...
ON EACH DAY THUNDERSTORMS ARE EXPECTED. THUNDERSTORMS WILL BE
CAPABLE OF PRODUCING STRONG GUSTY WINDS...LOCALLY HEAVY RAINS...
AND FREQUENT DEADLY LIGHTNING STRIKES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.

In the hours before

Local storm report, Jul 1, 5:39 PM EDT, 51 minutes before
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Local storm report, Jul 1, 5:42 PM EDT, 48 minutes before
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Local storm report, Jul 1, 5:45 PM EDT, 45 minutes before
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Special weather statement, Jul 1, 5:50 PM EDT, 40 minutes before
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Local storm report, Jul 1, 5:57 PM EDT, 33 minutes before
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Special weather statement, Jul 1, 6:03 PM EDT, 27 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 1:45 PM EDTSpecial Weather StatementTBWManatee45 min
Jul 1, 3:54 PM EDTSpecial Weather StatementTBWPolk36 min
Jul 1, 4:01 PM EDTSpecial Weather StatementTBWCharlotte29 min
Jul 1, 5:02 PM EDTSpecial Weather StatementTBWHighlands43 min
Jul 1, 5:10 PM EDTSpecial Weather StatementTBWLee50 min
Jul 1, 5:21 PM EDTSevere Thunderstorm WarningTBWLee39 min
Jul 1, 5:47 PM EDTAreal Flood AdvisoryTBWLee58 min
Jul 1, 5:50 PM EDTSpecial Weather StatementTBWHighlands40 min
Jul 1, 6:03 PM EDTSpecial Weather StatementTBWLee27 min
Jul 1, 6:23 PM EDTSpecial Marine WarningTBW52 min
Jul 1, 6:27 PM EDTAreal Flood AdvisoryTBWHighlands63 min
Jul 1, 6:58 PM EDTSpecial Weather StatementTBWDeSoto32 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.