Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 1, NWS Key West, FL

January 17, 2011Monroe County, Florida

NWS Key West, FL issued this severe thunderstorm warning at Jan 17, 2011, 9:54 AM EST for Monroe County, Florida. It was in force for 24 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
Jan 17, 2011, 9:54 AM EST (14:54 UTC)
Expired
Jan 17, 2011, 10:18 AM EST
In force
24 min
Issued by
NWS Key West, FL
Area
Storm-based polygon

County Monroe County, FL

The radar

The Key West radar (KBYX), 74 km from the middle of the area, began a volume at 14:55 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 12:00Z, 2.9 hours before the alert went out and 76 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 12:00Z on 2011-01-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 672 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 12:00Z on 2011-01-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 134 square meters per square second.1939587897Sfc1 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
672 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
502 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
134 m²/s²
0-3 km storm-relative helicity
156 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.0

Open this sounding in Storm Lab

The text

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

043 
WUUS52 KKEY 171454
SVRKEY
FLC087-171530-
/O.NEW.KKEY.SV.W.0001.110117T1454Z-110117T1530Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE KEY WEST FL
954 AM EST MON JAN 17 2011

THE NATIONAL WEATHER SERVICE IN KEY WEST HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MIDDLE KEYS IN MONROE COUNTY IN FLORIDA...
  THIS INCLUDES THE COMMUNITY OF MARATHON...

* UNTIL 1030 AM EST

* AT 951 AM EST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN         
  EXCESS OF 60 MPH.  THIS STORM WAS LOCATED OVER HAWK CHANNEL JUST   
  SOUTH OF MARATHON...MOVING NORTHEAST AT 15 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  KEY COLONY BEACH...GRASSY KEY...AND DUCK KEY.

STRONG WINDS FROM THIS STORM WILL LIKELY PRODUCE LOCALIZED DAMAGE TO 
TREES AND SOME BUILDINGS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE KEY WEST
AT 3 0 5...2 9 5...1 3 1 6...EXTENSION 3.
&&

LAT...LON 2480 8081 2479 8089 2476 8089 2477 8092
      2471 8101 2471 8106 2468 8108 2470 8112
      2472 8111 2474 8103 2478 8094 2478 8092
      2480 8085 2484 8082 2484 8079
TIME...MOT...LOC 1452Z 207DEG 13KT 2469 8101

$$

KASPER
1 follow-up statement
314 
WWUS52 KKEY 171518
SVSKEY

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KEY WEST FL
1018 AM EST MON JAN 17 2011

FLC087-171527-
/O.CAN.KKEY.SV.W.0001.000000T0000Z-110117T1530Z/
MIDDLE KEYS IN MONROE FL-
1018 AM EST MON JAN 17 2011

...THE SEVERE THUNDERSTORM WARNING FOR MIDDLE KEYS IN MONROE COUNTY
IS CANCELED...

THE THUNDERSTORM THAT MOVED THROUGH THE MIDDLE KEYS FROM KEY COLONY 
BEACH TO DUCK KEY HAS MOVED NORTH OVER FLORIDA BAY...AND IS NO 
LONGER SEVERE.

LAT...LON 2480 8081 2479 8089 2476 8089 2477 8092
      2471 8101 2471 8106 2468 8108 2470 8112
      2472 8111 2474 8103 2478 8094 2478 8092
      2480 8085 2484 8082 2484 8079
TIME...MOT...LOC 1517Z 207DEG 13KT 2477 8096

$$

KASPER

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 16, 11:13 PM ESTSpecial Marine WarningKEY35 min
Jan 17, 12:30 AM ESTSpecial Marine WarningKEY60 min
Jan 17, 1:31 AM ESTSpecial Marine WarningKEY59 min
Jan 17, 2:32 AM ESTSpecial Marine WarningKEY58 min
Jan 17, 6:19 AM ESTSpecial Marine WarningKEY26 min
Jan 17, 6:44 AM ESTSpecial Marine WarningKEY31 min
Jan 17, 8:35 AM ESTSpecial Marine WarningKEY40 min
Jan 17, 9:17 AM ESTSpecial Marine WarningKEY58 min
Jan 17, 10:13 AM ESTSpecial Marine WarningKEY62 min
Jan 17, 11:06 AM ESTSpecial Marine WarningKEY54 min
Jan 17, 11:56 AM ESTSpecial Marine WarningKEY64 min
Jan 17, 1:58 PM ESTSpecial Marine WarningKEY62 min
Jan 17, 2:52 PM ESTSpecial Marine WarningKEY53 min
Jan 17, 3:38 PM ESTSpecial Marine WarningKEY51 min
Jan 17, 4:25 PM ESTSpecial Marine WarningKEY65 min
Jan 17, 5:27 PM ESTSpecial Marine WarningKEY63 min
Jan 17, 5:30 PM ESTSpecial Marine WarningKEY60 min
Jan 17, 6:29 PM ESTSpecial Marine WarningKEY61 min
Jan 17, 6:33 PM ESTSpecial Marine WarningKEY57 min

Nearby

Severe Thunderstorm Warnings in Florida, 2011Every severe thunderstorm warning 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.