Alert archive / Florida / Special Weather Statements in 2020

Special Weather Statement, NWS Key West, FL

January 31, 2020

NWS Key West, FL issued this special weather statement at Jan 31, 2020, 10:58 PM EST. It was in force for 62 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 31, 2020, 10:58 PM EST (03:58 UTC)
Expired: Feb 1, 2020, 12:00 AM EST
In force: 62 min
Issued by: NWS Key West, FL

The radar

The Miami radar (KAMX), 65 km from the middle of the area, began a volume at 04:03 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

Miami, FL (KMFL), launched 00:00Z, 4.0 hours before the alert went out and 91 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: 76 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 991 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

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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 Key West, FL wrote its last area forecast discussion before this special weather statement went out at Jan 31, 3:58 PM EST, 7 hours earlier.

Area forecast discussion, Jan 31, 3:58 PM EST, 7 hours before

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Hazardous weather outlook, Jan 31, 5:05 AM EST, 17 hours 53 minutes before

Hazardous Weather Outlook
National Weather Service Key West FL
505 AM EST Fri Jan 31 2020

FLZ076>078-GMZ031>035-042>044-052>055-072>075-011100-
Monroe Upper Keys-Monroe Middle Keys-Monroe Lower Keys-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
Bayside and Gulf side from Craig Key to west end of Seven Mile
Bridge-
Gulf waters from East Cape Sable to Chokoloskee 20 to 60 NM out
and beyond 5 fathoms-
Gulf of Mexico including Dry Tortugas and Rebecca Shoal Channel-
Gulf of Mexico from west end of Seven Mile Bridge to Halfmoon
Shoal out to 5 Fathoms-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
Straits of Florida from Ocean Reef to Craig Key out 20 NM-
Straits of Florida from Craig Key to west end of Seven Mile
Bridge out 20 NM-
Straits of Florida from west end of Seven Mile Bridge to south of
Halfmoon Shoal out 20 NM-
Straits of Florida from Halfmoon Shoal to 20 NM west of Dry
Tortugas out 20 NM-
Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out-
Straits of Florida from Craig Key to west end of Seven Mile
Bridge 20 to 60 NM out-
Straits of Florida from west end of Seven Mile Bridge to south of
Halfmoon Shoal 20 to 60 NM out-
Straits of Florida from Halfmoon Shoal to 20 NM west of Dry
Tortugas 20 to 60 NM out-
505 AM EST Fri Jan 31 2020

This Hazardous Weather Outlook is for the Florida Keys and
adjacent coastal waters.

.DAY ONE...TODAY AND TONIGHT

Scattered thunderstorms will be possible across the Florida Keys
and adjacent waters this afternoon and tonight. The primary
thunderstorm hazards will be cloud to surface lightning strikes
and strong gusty winds. A few thunderstorms may become severe,
producing damaging winds. An isolated tornado or two will also be
possible tonight. The Storm Prediction Center is forecasting
a slight risk for severe thunderstorms across the Keys for this
afternoon and tonight.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

Isolated thunderstorms will be possible across the Florida Keys
and adjacent waters on Saturday. The primary thunderstorm hazards
will be cloud to surface lightning strikes and strong gusty
winds. A couple of thunderstorms may become strong to severe,
producing damaging winds. The Storm Prediction Center is
forecasting a slight risk for severe thunderstorms across the Keys
for Saturday.

A Small Craft Advisory will likely be required for all of the Keys
waters from late Saturday through at least Sunday morning, due to
strong northwest to north winds and building seas behind a cold
front. Winds and seas should decrease below advisory levels by
Monday.

For Monday through Thursday, no hazardous weather is expected at
this time.

.SPOTTER INFORMATION STATEMENT...

Spotters should report any hazardous weather observed to the
National Weather Service in Key West according to standard
operating procedures.

In the hours before

Special weather statement, Jan 31, 8:58 PM EST, 2 hours before

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Local storm report, Jan 31, 9:19 PM EST, 1 hour 39 minutes before

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Local storm report, Jan 31, 9:44 PM EST, 1 hour 14 minutes before

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Special weather statement, Jan 31, 9:58 PM EST, 1 hour before

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Local storm report, Jan 31, 10:06 PM EST, 52 minutes before

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Special weather statement, Jan 31, 10:58 PM EST, 0 minutes before

Special Weather Statement
National Weather Service Key West FL
1058 PM EST Fri Jan 31 2020

FLZ076-077-010500-
Monroe Upper Keys FL-Monroe Middle Keys FL-
1058 PM EST Fri Jan 31 2020

...SIGNIFICANT WEATHER ADVISORY FOR MIDDLE KEYS IN MONROE AND UPPER
KEYS IN MONROE COUNTIES UNTIL MIDNIGHT EST...

At 1058 PM EST, National Weather Service Meteorologists detected
strong thunderstorms along a line extending from 10 miles southeast
of Mahogany Hammock to 10 miles southeast of Flamingo to Grassy Key
to 14 miles south of Bahia Honda Key. Movement was east at 35 mph.

Winds in excess of 45 mph will be possible with these storms.

Locations impacted include...
Marathon, East End Of Long Key Viaduct, East End Of Channel 5 Bridge,
West End Of Channel 5 Bridge, Jewfish Creek Bridge, Long Key Viaduct,
Key Largo, Channel 5 Bridge, West End Of Long Key Viaduct and
Plantation.

This includes US 1 between mile markers 51 and 112.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A Severe Thunderstorm Watch remains in effect until 300 AM EST for
Florida.

LAT...LON 2528 8025 2513 8034 2493 8055 2479 8078
      2478 8086 2466 8106 2467 8111 2477 8103
      2487 8077 2493 8071 2495 8065 2508 8050
      2524 8050 2522 8048 2526 8043 2523 8038
      2529 8039 2528 8033 2535 8026
TIME...MOT...LOC 0358Z 269DEG 29KT 2521 8077 2502 8081 2476 8097 2446
8121

Haner

The office that day

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

Issued	Product	Office	Lasted
Jan 31, 7:07 PM EST	Special Marine Warning	KEY	53 min
Jan 31, 7:51 PM EST	Special Marine Warning	KEY	54 min
Jan 31, 8:05 PM EST	Special Marine Warning	KEY	55 min
Jan 31, 8:54 PM EST	Special Marine Warning	KEY	66 min
Jan 31, 8:58 PM EST	Special Weather Statement	KEY	62 min
Jan 31, 9:54 PM EST	Special Marine Warning	KEY	66 min
Jan 31, 9:58 PM EST	Special Weather Statement	KEY	62 min
Jan 31, 10:55 PM EST	Special Marine Warning	KEY	65 min
Jan 31, 11:21 PM EST	Special Marine Warning	KEY	54 min
Jan 31, 11:55 PM EST	Special Marine Warning	KEY	65 min
Feb 1, 4:17 AM EST	Small Craft Advisory	KEY	36 hr
Feb 1, 9:13 AM EST	Special Marine Warning	KEY	62 min
Feb 1, 10:16 AM EST	Special Marine Warning	KEY	59 min
Feb 1, 11:23 AM EST	Special Marine Warning	KEY	48 min
Feb 1, 12:56 PM EST	Special Marine Warning	KEY	29 min
Feb 1, 5:01 PM EST	Special Marine Warning	KEY	59 min

Nearby

Special Weather Statements in Florida, 2020 Every special weather statement in 2020

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.