Alert archive / Florida / Tornado Warnings in 2011

Tornado Warning 2, NWS Key West, FL

October 17, 2011Monroe County, Florida

NWS Key West, FL issued this tornado warning at Oct 17, 2011, 10:16 PM EDT for Monroe County, Florida. It was in force for 29 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
Oct 17, 2011, 10:16 PM EDT (02:16 UTC)
Expired
Oct 17, 2011, 10:45 PM EDT
In force
29 min
Issued by
NWS Key West, FL
Area
Storm-based polygon

County Monroe County, FL

The radar

The Key West radar (KBYX), 93 km from the middle of the area, began a volume at 02:19 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

Key West, FL (KEYW), launched 00:00Z, 2.3 hours before the alert went out and 96 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, Key West, FL at 00:00Z on 2011-10-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1148 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, Key West, FL at 00:00Z on 2011-10-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 220 square meters per square second.193958Sfc1 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
1148 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
565 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
220 m²/s²
0-3 km storm-relative helicity
295 m²/s²
Significant tornado parameter
1.2
Supercell composite
7.8

Open this sounding in Storm Lab

The text

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

973 
WFUS52 KKEY 180216
TORKEY
FLC087-180245-
/O.NEW.KKEY.TO.W.0002.111018T0216Z-111018T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE KEY WEST FL
1016 PM EDT MON OCT 17 2011

THE NATIONAL WEATHER SERVICE IN KEY WEST HAS ISSUED A

* TORNADO WARNING FOR...
  MIDDLE KEYS IN MONROE COUNTY IN FLORIDA...

* UNTIL 1045 PM EDT

* AT 1016 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO OVER HAWK
  CHANNEL BETWEEN LONG KEY AND TENNESSEE REEF...MOVING NORTHWEST
  AT 10 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  LONG KEY...AND THE COMMUNITY OF LAYTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT
TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.

IF YOU ARE IN A MOBILE HOME OR VEHICLE...EVACUATE IT AND GET INSIDE A
SUBSTANTIAL SHELTER. LIE FLAT IN A LOW SPOT ON THE GROUND AND COVER
YOUR HEAD WITH YOUR HANDS.
&&

LAT...LON 2481 8080 2481 8082 2480 8084 2480 8086
      2481 8085 2484 8081 2485 8079 2484 8078
      2483 8079 2482 8078
TIME...MOT...LOC 0214Z 147DEG 8KT 2477 8079

$$

KASPER
1 follow-up statement
198 
WWUS52 KKEY 180245
SVSKEY

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KEY WEST FL
1045 PM EDT MON OCT 17 2011

FLC087-180252-
/O.EXP.KKEY.TO.W.0002.000000T0000Z-111018T0245Z/
MIDDLE KEYS IN MONROE FL-
1045 PM EDT MON OCT 17 2011

...THE TORNADO WARNING FOR MIDDLE KEYS IN MONROE COUNTY WILL EXPIRE
AT 1045 PM EDT...

AT 1045 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT THE STORM PRODUCING A POSSIBLE TORNADO HAS MOVED ACROSS THE 
LONG KEY VIADUCT AND THE WESTERN END OF LONG KEY...AND IS NOW OVER 
THE EXTREME SOUTHEASTERN GULF OF MEXICO...NORTHWEST OF LONG KEY. AS 
A RESULT...THE TORNADO WARNING FOR LONG KEY HAS BEEN ALLOWED TO 
EXPIRE.

LAT...LON 2481 8080 2481 8082 2480 8084 2480 8086
      2481 8085 2484 8081 2485 8079 2484 8078
      2483 8079 2482 8078
TIME...MOT...LOC 0242Z 144DEG 9KT 2483 8087

$$

KASPER

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 17, 8:34 PM EDTSpecial Marine WarningKEY26 min
Oct 17, 8:44 PM EDTSpecial Marine WarningKEY61 min
Oct 17, 9:05 PM EDTSpecial Marine WarningKEY40 min
Oct 17, 9:19 PM EDTSpecial Marine WarningKEY56 min
Oct 17, 9:43 PM EDTSpecial Marine WarningKEY47 min
Oct 17, 10:12 PM EDTSpecial Marine WarningKEY48 min
Oct 17, 10:22 PM EDTSpecial Marine WarningKEY38 min
Oct 17, 10:55 PM EDTSpecial Marine WarningKEY35 min
Oct 17, 11:08 PM EDTSpecial Marine WarningKEY29 min
Oct 18, 12:06 AM EDTAreal Flood AdvisoryKEYMonroe4 hr
Oct 18, 12:46 AM EDTSpecial Marine WarningKEY59 min
Oct 18, 3:15 AM EDTSpecial Marine WarningKEY43 min
Oct 18, 4:33 AM EDTSpecial Marine WarningKEY37 min
Oct 18, 4:34 AM EDTSmall Craft AdvisoryKEY31 hr
Oct 18, 11:45 AM EDTSpecial Marine WarningKEY60 min
Oct 18, 12:45 PM EDTSpecial Marine WarningKEY60 min
Oct 18, 1:46 PM EDTSpecial Marine WarningKEY59 min
Oct 18, 2:48 PM EDTSpecial Marine WarningKEY57 min
Oct 18, 3:48 PM EDTSpecial Marine WarningKEY57 min
Oct 18, 3:52 PM EDTSpecial Marine WarningKEY53 min
Oct 18, 4:43 PM EDTSpecial Marine WarningKEY62 min
Oct 18, 4:45 PM EDTSpecial Marine WarningKEY60 min
Oct 18, 5:42 PM EDTSpecial Marine WarningKEY63 min
Oct 18, 5:46 PM EDTSpecial Marine WarningKEY29 min
Oct 18, 5:49 PM EDTSpecial Marine WarningKEY86 min
Oct 18, 6:45 PM EDTSpecial Marine WarningKEY30 min
Oct 18, 6:51 PM EDTSpecial Marine WarningKEY24 min

Nearby

Tornado Warnings in Florida, 2011Every tornado warning in 2011Tornadoes 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.