Alert archive / Florida / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 34, NWS Tampa Bay, FL

July 4, 2019Hillsborough County, Pasco County, Pinellas County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Jul 4, 2019, 2:48 PM EDT for Hillsborough County, Pasco County, Pinellas County, Florida. It was in force for 22 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 4, 2019, 2:48 PM EDT (18:48 UTC)
Expired
Jul 4, 2019, 3:10 PM EDT
In force
22 min
Issued by
NWS Tampa Bay, FL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Hillsborough County, FL, Pasco County, FL, Pinellas County, FL

The radar

The Tampa radar (KTBW), 39 km from the middle of the area, began a volume at 18:48 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 6.8 hours before the alert went out and 202 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, Cape Canaveral, FL at 12:00Z on 2019-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 443 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, Cape Canaveral, FL at 12:00Z on 2019-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 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
443 J/kg
Mixed-layer CIN
-103 J/kg
Mixed-layer LCL
1277 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
4 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 4, 1:24 PM EDT, 1 hour 24 minutes earlier.

Area forecast discussion, Jul 4, 1:24 PM EDT, 1 hour 24 minutes before
Area Forecast Discussion
National Weather Service Tampa Bay Ruskin FL
124 PM EDT Thu Jul 4 2019

.AVIATION...
04/18Z TAF cycle. TSRA ongoing near TPA/PIE and will spread to the
rest of the terminals through the afternoon with some TEMPO MVFR
20-23Z. TSRA end 02-03Z. Winds are or will shortly become SW then
W or NW toward evening. Light and VRBL overnight then SE or S aft
14Z.

&&

.Prev Discussion... /issued 813 AM EDT Thu Jul 4 2019/

..HEAT ADVISORY FROM NOON UNTIL 6 PM FOR HEAT INDICES OF 108 TO 112
   DEGREES...

UPDATE...
Latest RAP model has mid level ridging across the region through
this evening while at the surface high pressure in the Gulf of
Mexico moves toward the TX coast in response to Atlantic high
pressure building in from the east. This will shift prevailing
northeast and east winds to southeasterly - although becoming
westerly in an afternoon sea breeze. Forecast PWAT values will be
high...in a 1.9-2.0 inch range.

Another hot day is on tap with highs reaching the mid 90s and
resulting in heat indices of 108-112 degrees...with a heat
advisory in place. The abundant moisture and daytime heating will
support showers and thunderstorms with sea breeze boundaries
providing a focus. Coverage will be scattered to occasionally
numerous and concentrated along and east of the I-75 corridor.
Current forecast looks on track but may make minor adjustments
through out the morning.

MARINE...
Prevailing northeast and east winds become southeasterly...
although shifting to westerly in afternoon sea breezes. Main
concern will be isolated-scattered thunderstorms with higher
winds and seas.

&&

.Preliminary Point Temps/PoPs...
TPA  93  79  91  78 /  30  50  40  50
FMY  94  77  93  76 /  20  40  40  50
GIF  96  77  94  76 /  40  20  30  40
SRQ  92  78  92  77 /  40  40  40  50
BKV  95  75  93  74 /  50  40  50  50
SPG  93  80  91  78 /  30  50  30  50

&&

.TBW WATCHES/WARNINGS/ADVISORIES...
FL...Heat Advisory until 6 PM EDT this evening for Coastal Charlotte-
     Coastal Citrus-Coastal Hernando-Coastal Hillsborough-
     Coastal Lee-Coastal Levy-Coastal Manatee-Coastal Pasco-
     Coastal Sarasota-DeSoto-Hardee-Highlands-Inland Charlotte-
     Inland Citrus-Inland Hernando-Inland Hillsborough-Inland
     Lee-Inland Levy-Inland Manatee-Inland Pasco-Inland Sarasota-
     Pinellas-Polk-Sumter.

Gulf waters...None.
&&

09/RKR

In the hours before

Special weather statement, Jul 4, 1:54 PM EDT, 54 minutes before
Special Weather Statement
National Weather Service Tampa Bay Area Ruskin FL
154 PM EDT Thu Jul 4 2019

FLZ050-151-251-041845-
Coastal Hillsborough FL-Pinellas FL-Inland Hillsborough FL-
154 PM EDT Thu Jul 4 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PINELLAS AND
NORTHWESTERN HILLSBOROUGH COUNTIES UNTIL 245 PM EDT...

At 154 PM EDT, Doppler radar was tracking a strong thunderstorm over
Citrus Park, or 7 miles northwest of Tampa. This storm was nearly
stationary.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Tampa, Clearwater, Temple Terrace, Lutz, Keystone, Greater Northdale,
Tampa International Airport, Egypt Lake-Leto, Citrus Park, Greater
Carrollwood, Lake Magdalene, University, East Lake, West Park,
Oldsmar, Busch Gardens, University Of Tampa, Town N Country, Raymond
James Stadium and Ybor City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2817 8267 2817 8264 2812 8237 2793 8242
      2796 8268
TIME...MOT...LOC 1754Z 192DEG 1KT 2805 8255

TBW
Local storm report, Jul 4, 2:20 PM EDT, 28 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 8:05 PM EDTSpecial Weather StatementTBWPolk40 min
Jul 4, 3:40 AM EDTHeat AdvisoryTBWCharlotte, Citrus, DeSoto, Hardee, Hernando, Highlands and 9 more14 hr
Jul 4, 1:54 PM EDTSpecial Weather StatementTBWHillsborough51 min
Jul 4, 2:29 PM EDTAreal Flood AdvisoryTBWHillsborough61 min
Jul 4, 2:42 PM EDTSevere Thunderstorm WarningTBWHillsborough, Pinellas19 min
Jul 4, 2:45 PM EDTSpecial Marine WarningTBW45 min
Jul 4, 3:30 PM EDTSpecial Marine WarningTBW42 min
Jul 4, 3:35 PM EDTSpecial Weather StatementTBWCitrus40 min
Jul 4, 3:40 PM EDTSpecial Weather StatementTBWHernando35 min
Jul 4, 3:46 PM EDTSpecial Weather StatementTBWPasco29 min
Jul 4, 4:05 PM EDTSpecial Weather StatementTBWSumter40 min
Jul 4, 4:26 PM EDTSpecial Weather StatementTBWLevy34 min
Jul 4, 4:52 PM EDTSpecial Weather StatementTBWSumter38 min
Jul 4, 5:02 PM EDTSpecial Weather StatementTBWLevy28 min
Jul 4, 5:27 PM EDTAreal Flood AdvisoryTBWLevy63 min
Jul 4, 5:44 PM EDTSpecial Weather StatementTBWLevy46 min
Jul 4, 7:16 PM EDTSpecial Weather StatementTBWLee29 min
Jul 4, 7:30 PM EDTSpecial Marine WarningTBW32 min

Nearby

Severe Thunderstorm Warnings in Florida, 2019Every severe thunderstorm warning in 2019

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.