Alert archive / Florida / Special Weather Statements in 2011

Special Weather Statement, NWS Tampa Bay, FL

August 9, 2011Manatee County, Florida

NWS Tampa Bay, FL issued this special weather statement at Aug 9, 2011, 2:46 PM EDT for Manatee County, Florida. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 9, 2011, 2:46 PM EDT (18:46 UTC)
Expired: Aug 9, 2011, 3:30 PM EDT
In force: 44 min
Issued by: NWS Tampa Bay, FL

County Manatee County, FL

The radar

The Tampa radar (KTBW), 18 km from the middle of the area, began a volume at 18:47 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, 6.8 hours before the alert went out and 18 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3252 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 563 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 9, 1:51 PM EDT, 55 minutes earlier.

Area forecast discussion, Aug 9, 1:51 PM EDT, 55 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
151 PM EDT TUE AUG 9 2011

.SYNOPSIS...
THE PATTERN ALOFT EARLY THIS AFTERNOON HAS A SHORT WAVE TROUGH
APPROACHING THE PACIFIC NORTHWEST...A BROAD RIDGE DOMINATING
MUCH OF THE SOUTHERN U.S. AND A LOW OVER ONTARIO TROUGHING TOWARD
THE MID-ATLANTIC STATES. AT THE SURFACE...HIGH PRESSURE SPRAWLS
ACROSS THE NORTH PLAINS WITH ONE FRONTAL BOUNDARY FROM THE
CENTRAL PLAINS TO UPPER GREAT LAKES AND A SECOND BOUNDARY ARCING
FROM THE ROCKIES ACROSS THE SOUTHERN PLAINS TO THE LOWER GREAT LAKES
AND MID-ATLANTIC COAST. HIGH PRESSURE OVER THE OPEN ATLANTIC...NORTH
OF LATITUDE 20...RIDGES WEST OVER CUBA TO THE GULF.

&&

.SHORT TERM (TONIGHT - THURSDAY)...
THE EAST COAST UPPER TROUGHING DROPS DOWN OVER THE SE U.S. COAST...
PUSHING THE SOUTHERN MOST FRONT/BOUNDARY WITH IT AS A SURFACE
TROUGH...AS THE CUBAN RIDGE AXIS LINGERS IN PLACE TRHOUGH WED.
THESE FEATURES MAINTAIN WESTERLY FLOW WITH DEEP MOISTURE. THEN BY
THU...THE UPPER TROUGH SLIDES OFFSHORE WITH SOME DRIER AIR ALOFT
WORKING IN ON NW FLOW. THE SURFACE TROUGH WEAKENS OVER THE SE
COAST WITH THE RIDGE AXIS LIFTING INTO THE STRAITS OR FAR SOUTHERN
FL...WITH WESTERLY LOW LEVEL FLOW GENERALLY CONTINUING BUT LESS
ROBUST.

CLOUDY THIS AFTERNOON AS NUMEROUS SHOWERS AND STORMS HAVE FILLED IN
MOST OF THE AREA. THESE WILL DIMINISH SOME AS THEY CONTINUE THROUGH
THE OVERNIGHT HOURS. HAVE LOWERED THE AFTERNOON HIGHS...TEMPERATURES
ARE STRUGGLING TO REACH THE 80S.

PATTERN CONTINUES WITH SIMILAR CONDITIONS WED WITH NUMEROUS SHOWERS
AND STORMS ALTHOUGH A BIT LESS SO AND HAVE MADE POPS 60 PERCENT CWA
WIDE. DRIER AIR BEGINS THU WITH DECREASING CLOUDS AND SHOWERS AND
STORMS IN THE LOW TO MID CATEGORY RANGE.

.LONG TERM (THURSDAY NIGHT-TUESDAY)...
THE LONG TERM PERIOD BEGINS WITH A TROUGH MOVING TOWARDS THE EAST
COAST AND THE SURFACE RIDGE OVER EXTREME SOUTH FLORIDA. ON FRIDAY
THE UPPER TROUGH WEAKENS/LIFTS NORTHWARD ALLOWING THE SURFACE RIDGE
TO DRIFT SLIGHTLY NORTHWARD. SOME DRIER AIR SHOULD BE MOVING IN BY
MIDDAY WHICH WILL HELP KEEP RAIN CHANCES AROUND 30%. HAVE INCLUDED
AN AREA OF 40% POPS OVER OUR SOUTHERN COUNTIES WHERE FLOW (ALTHOUGH
LIGHT) WILL BE MORE EASTERLY.

THE RIDGE SHIFTS OVERHEAD ON SATURDAY AND MOISTURE REMAINS RATHER
LIMITED...SO POPS REMAIN IN THE 30-40% RANGE. ANOTHER TROUGH MOVES
THROUGH THE GREAT LAKES AND TOWARDS THE MID ATLANTIC COAST LATE
SATURDAY/EARLY SUNDAY. THIS PUSHES THE SURFACE RIDGE BACK TO THE
SOUTH AS WELL AS INCREASES MOISTURE...SO POPS BACK UP TO 40%
AREA-WIDE SUNDAY AFTERNOON. THE TROUGH DOESN'T SHIFT OFF THE EAST
COAST UNTIL MONDAY EVENING...SO SIMILAR CONDITIONS EXPECTED ON
MONDAY.

WITH AVERAGE TO BELOW AVERAGE RAIN CHANCES THROUGHOUT THE
EXTENDED...TEMPS WILL CONTINUE TO RUN SEVERAL DEGREES ABOVE NORMAL
EACH DAY.

&&

.AVIATION...
SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL CONTINUE INTO
EARLY THIS EVENING THEN BECOME ISOLATED OVERNIGHT BEFORE MORE
CONVECTION DEVELOPS OVER THE COASTAL WATERS AND MOVES ONSHORE LATE
TONIGHT AND WEDNESDAY MORNING. MVFR/LOCAL IFR CONDITIONS WILL BE
POSSIBLE IN THE CONVECTION...OTHERWISE VFR CONDITIONS ARE EXPECTED.

&&

.MARINE...
WEST TO NW WINDS CONTINUE FOR THE NEXT COUPLE OF DAYS AS THE TROUGH
TO THE NORTH WEAKENS AND THE RIDGE TO THE SOUTH LIFTS NORTH WITH A
RELAXING GRADIENT. STILL SOME WIND ON THE GULF BUT SPEEDS SHOULD BE
COMING DOWN TO AROUND 15KT TONIGHT...AND WILL LET THE CAUTION
HEADLINE EXPIRE WITH THE AFTERNOON FORECAST ISSUANCE...AND CONTINUE
FOR WED. WINDS THEN RUN 1OKT OR LESS AS THEY SHIFT TO EAST LATE IN
THE WEEK AND THEN BACK TO WEST BY SUN.

&&

.FIRE WEATHER...
NO CONCERNS.

&&

.PRELIMINARY POINT TEMPS/POPS...
TPA  80  91  80  93 /  40  60  30  40
FMY  78  91  77  93 /  30  60  30  40
GIF  77  93  77  95 /  40  60  30  40
SRQ  80  90  79  92 /  40  60  30  40
BKV  75  92  75  95 /  40  60  20  30
SPG  82  91  82  93 /  40  60  30  40

&&

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

&&

SHORT TERM/MARINE/FIRE WEATHER...09/RUDE
LONG TERM...23/MCNATT
AVIATION...69/CLOSE

Hazardous weather outlook, Aug 9, 5:41 AM EDT, 9 hours 5 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
541 AM EDT TUE AUG 9 2011

FLZ039-042-043-048>052-055>057-060>062-065-091600-
LEVY-CITRUS-SUMTER-HERNANDO-PASCO-PINELLAS-HILLSBOROUGH-POLK-
MANATEE-HARDEE-HIGHLANDS-SARASOTA-DE SOTO-CHARLOTTE-LEE-
541 AM EDT TUE AUG 9 2011

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

.DAY ONE...TODAY AND TONIGHT.

...THUNDERSTORM IMPACT...
NUMEROUS THUNDERSTORMS WILL BE POSSIBLE TODAY AND TONIGHT UNDER A
WARM AND MOIST WESTERLY FLOW. HEAVY RAINS...GUSTY WINDS AND
FREQUENT DEADLY LIGHTNING WILL BE THE MAIN HAZARDS WITH THE
STORMS.

...RIP CURRENT IMPACT...
THERE IS A MODERATE RISK OF RIP CURRENTS AT AREA BEACHES TODAY
WITH A MODERATE WESTERLY FLOW IN PLACE. A RIP CURRENT IS A 10 TO
30 YARD WIDE CHANNEL OF WATER THAT CAN PULL EVEN A STRONG SWIMMER
INTO DEEPER WATER. TO AVOID GETTING CAUGHT IN A RIP CURRENT...SWIM
AT GUARDED BEACHES AND HEED THE ADVICE OF THE BEACH PATROL. AT
UNGUARDED BEACHES AND NEAR PIERS...JETTIES...AND INLETS...DO NOT
GO INTO THE SURF MUCH ABOVE YOUR KNEES.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

...THUNDERSTORM IMPACT...
SCATTERED TO NUMEROUS THUNDERSTORMS WILL BE POSSIBLE EACH DAY AND
NIGHT WITH GUSTY WINDS...HEAVY RAINS AND FREQUENT DEADLY LIGHTNING
POSSIBLE.

...EXCESSIVE HEAT IMPACT...
AFTERNOON TEMPERATURES WILL CLIMB INTO THE LOWER TO MID 90S FOR
THE END OF THE WEEK. THIS WILL ALLOW HEAT INDEX VALUES TO BE
GENERALLY AROUND 105.

...RIP CURRENT IMPACT...
WESTERLY WINDS WILL BRING A MODERATE RISK OF RIP CURRENTS TO AREA
BEACHES THROUGH THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS SHOULD MONITOR THE WEATHER AND SELF ACTIVATE IF NEEDED.

COLSON

In the hours before

Special weather statement, Aug 9, 11:06 AM EDT, 3 hours 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
1106 AM EDT TUE AUG 9 2011

FLZ051-052-091545-
POLK-HILLSBOROUGH-
1106 AM EDT TUE AUG 9 2011

...STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN HILLSBOROUGH AND
POLK COUNTIES...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES THUNDERSTORMS
LOCATED ALONG A LINE EXTENDING FROM LOUGHMAN TO FORT LONESOME...OR
ALONG A LINE EXTENDING FROM INTERCESSION CITY TO 20 MILES SOUTHEAST
OF BRANDON...MOVING EAST AT 20 MPH...WILL AFFECT WINTER HAVEN...
MULBERRY...LAKE ALFRED AND INWOOD...UNTIL 1145 AM EDT.

GUSTY WINDS 35 TO 45 MPH WILL OCCUR. TORRENTIAL RAINS WILL REDUCE
VISIBILITY TO NEAR ZERO AND WILL CAUSE PONDING OF WATER ON ROADWAYS.

&&

LAT...LON 2802 8138 2805 8145 2800 8141 2801 8139
      2800 8138 2797 8137 2765 8173 2765 8226
      2827 8156 2820 8152 2815 8152 2815 8146
      2809 8144 2808 8134
TIME...MOT...LOC 1506Z 274DEG 17KT 2821 8151 2769 8208

Special weather statement, Aug 9, 12:10 PM EDT, 2 hours 36 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
1210 PM EDT TUE AUG 9 2011

FLZ055-056-091700-
HARDEE-MANATEE-
1210 PM EDT TUE AUG 9 2011

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR EASTERN MANATEE
AND CENTRAL HARDEE COUNTIES FOR A STRONG THUNDERSTORM WITH STRONG
WIND GUSTS VALID UNTIL 100 PM EDT...

AT 1209 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES A
STRONG THUNDERSTORM LOCATED NEAR MYAKKA HEAD...OR 16 MILES WEST OF
WAUCHULA...MOVING EAST AT 20 MPH WILL AFFECT MYAKKA HEAD...DUETTE...
ONA AND WAUCHULA.

GUSTY WINDS OF 45 TO 55 MPH CAN BE EXPECTED WHICH CAN CAUSE UNSECURED
OBJECTS TO BLOW AROUND...SNAP TREE LIMBS AND CAUSE POWER OUTAGES.
FREQUENT LIGHTNING IS EXPECTED. TO BE SAFE GO INDOORS IMMEDIATELY.
IF CAUGHT OUTSIDE...FIND A LOW SPOT...AND STAY AWAY FROM TALL
OBJECTS. TORRENTIAL RAINS WILL REDUCE VISIBILITY TO NEAR ZERO AND
WILL CAUSE PONDING OF WATER ON ROADWAYS.

&&

LAT...LON 2761 8175 2738 8178 2744 8218 2762 8216
TIME...MOT...LOC 1610Z 275DEG 19KT 2752 8207

Special weather statement, Aug 9, 2:29 PM EDT, 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
229 PM EDT TUE AUG 9 2011

FLZ050-051-091915-
HILLSBOROUGH-PINELLAS-
229 PM EDT TUE AUG 9 2011

...STRONG THUNDERSTORMS WILL AFFECT SOUTHERN PINELLAS AND WESTERN
HILLSBOROUGH COUNTIES...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES THUNDERSTORMS
LOCATED NEAR HIGHPOINT...OR NEAR PINELLAS PARK...MOVING EAST AT 20
MPH...WILL AFFECT SEMINOLE...PINELLAS PARK...MADEIRA BEACH AND
LEALMAN...UNTIL 315 PM EDT.

THIS INCLUDES INTERSTATE 275 BETWEEN EXITS 6 AND 32.

GUSTY WINDS 35 TO 45 MPH WILL OCCUR. FREQUENT LIGHTNING IS EXPECTED.
TO BE SAFE GO INDOORS IMMEDIATELY. IF CAUGHT OUTSIDE...FIND A LOW
SPOT...AND STAY AWAY FROM TALL OBJECTS. WHEN DRIVING THROUGH HEAVY
RAIN...SLOW DOWN. ALWAYS LEAVE A SAFE DISTANCE BETWEEN YOU AND OTHER
VEHICLES.

WIND GUSTS OF 37 MPH HAVE BEEN MEASURED AT INDIAN SHORES IN PINELLAS
COUNTY AND GUSTS TO 38 MPH AT SAINT PETE-CLEARWATER AIRPORT.

TORRENTIAL DOWNPOURS WILL DROP UP TO 2 INCHES IN AN HOUR.

&&

LAT...LON 2800 8277 2797 8267 2795 8271 2788 8261
      2788 8255 2793 8254 2791 8248 2785 8246
      2789 8241 2788 8237 2784 8241 2785 8246
      2780 8245 2780 8259 2770 8263 2769 8271
      2763 8266 2763 8268 2786 8286
TIME...MOT...LOC 1828Z 280DEG 19KT 2789 8269

JOHNSON

Special weather statement, Aug 9, 2:46 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
246 PM EDT TUE AUG 9 2011

FLZ051-055-091930-
HILLSBOROUGH-MANATEE-
246 PM EDT TUE AUG 9 2011

...STRONG THUNDERSTORMS WILL AFFECT NORTHEASTERN MANATEE AND
SOUTHEASTERN HILLSBOROUGH COUNTIES...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES THUNDERSTORMS
LOCATED 6 MILES WEST OF RUSKIN...OR 9 MILES EAST OF SAINT
PETERSBURG...MOVING EAST AT 30 MPH...WILL AFFECT APOLLO BEACH...
RUSKIN...SUN CITY CENTER AND WIMAUMA...UNTIL 330 PM EDT.

GUSTY WINDS 35 TO 45 MPH WILL OCCUR. FREQUENT LIGHTNING IS EXPECTED.
TO BE SAFE GO INDOORS IMMEDIATELY. IF CAUGHT OUTSIDE...FIND A LOW
SPOT...AND STAY AWAY FROM TALL OBJECTS. WHEN DRIVING THROUGH HEAVY
RAIN...SLOW DOWN. ALWAYS LEAVE A SAFE DISTANCE BETWEEN YOU AND OTHER
VEHICLES.

&&

LAT...LON 2773 8206 2747 8205 2765 8254 2778 8243
TIME...MOT...LOC 1847Z 287DEG 28KT 2771 8249

JOHNSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 10:41 AM EDT	Special Marine Warning	TBW		34 min
Aug 9, 11:06 AM EDT	Special Weather Statement	TBW	Polk	39 min
Aug 9, 12:10 PM EDT	Special Weather Statement	TBW	Hardee	50 min
Aug 9, 1:45 PM EDT	Areal Flood Advisory	TBW	Hillsborough, Pasco	60 min
Aug 9, 2:13 PM EDT	Areal Flood Advisory	TBW	Pinellas	3 hr
Aug 9, 2:22 PM EDT	Special Marine Warning	TBW		23 min
Aug 9, 2:24 PM EDT	Special Marine Warning	TBW		51 min
Aug 9, 2:46 PM EDT	Areal Flood Advisory	TBW	Hillsborough	3 hr
Aug 9, 2:49 PM EDT	Severe Thunderstorm Warning	TBW	Hillsborough, Manatee	41 min
Aug 9, 3:04 PM EDT	Special Weather Statement	TBW	Manatee, Sarasota	41 min
Aug 9, 3:05 PM EDT	Special Marine Warning	TBW		29 min
Aug 9, 3:16 PM EDT	Areal Flood Advisory	TBW	Hillsborough, Manatee	119 min
Aug 9, 3:24 PM EDT	Special Weather Statement	TBW	Manatee	51 min
Aug 9, 3:46 PM EDT	Severe Thunderstorm Warning	TBW	DeSoto, Hardee, Manatee	29 min
Aug 9, 4:39 PM EDT	Special Weather Statement	TBW	Highlands	51 min
Aug 9, 5:01 PM EDT	Special Marine Warning	TBW		44 min
Aug 9, 6:41 PM EDT	Special Marine Warning	TBW		34 min

Nearby

Special Weather Statements in Florida, 2011 Every special weather statement in 2011

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.