A weak cold front moving through Florida produced a line of showers and thunderstorms that moved through South Florida during the afternoon hours. A strong thunderstorm produced small hail as it moved coastal Palm Beach county.
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The episode as NWS MFL wrote it up.
A weak cold front moving through Florida produced a line of showers and thunderstorms that moved through South Florida during the afternoon hours. A strong thunderstorm produced small hail as it moved coastal Palm Beach county.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Miami, FL wrote its last area forecast discussion before the first event at Feb 9, 1:13 PM EST, 2 hours 2 minutes earlier.
Area Forecast Discussion
National Weather Service Miami FL
113 PM EST Thu Feb 9 2017
.AVIATION...
Diffuse front continues to move into South Florida, with low level
stratus continuing to stream into the region. Thus far shower
activity has been mainly off of Southwest Florida, with a thin
line of showers about to approach KAPF with VCSH assigned and very
brief IFR conditions possible for KAPF with passage of showers or
low stratus over the next couple of hours. For the Atlantic coast
terminals, ceilings in the 2-4 kft possible this afternoon with a
light passing shower, with MVFR ceilings possible on occasion or
scattered stratus occasionally. This evening and tonight a
clearing trend is expected with the front passing into the Florida
straits early Friday morning. Westerly winds this afternoon will
transition to northwesterly later this afternoon and evening then
becoming north northeast around 03-06z.
60/BD
&&
.PREV DISCUSSION... /issued 1219 PM EST Thu Feb 9 2017/
UPDATE...
Updated the short term forecast late in the morning to reflect the
conditions in advance of the diffuse cold front moving across the
Florida peninsula and adjacent waters. Only passing isolated
showers are anticipated this afternoon and early evening, with
regional radars currently indicating only spotty activity, and
mainly across the Gulf waters of southwest Florida. Low stratus is
currently occurring across South Florida and local waters, with a
gradual clearing trend expected late this evening and over night
with the frontal passage.
For the coastal waters, a Small Craft Advisory is in effect for
the Gulf and Atlantic waters. Increasing winds and seas are
forecast with the frontal passage, with hazardous seas forecast
after 00z this evening. Across the Gulf waters hazardous
conditions are mainly expected across the off shore waters, but
the near shore waters were included in the SCA due to uncertainty
and could be affected by 20 knot winds in the outer portions. Lake
Okeechobee and Biscayne Bay were not included in the advisory, but
may be as conditions change tonight into Friday.
60/BD
PREV DISCUSSION... /issued 705 AM EST Thu Feb 9 2017/
AVIATION...
Latest split channel satellite imagery indicates widespread dense
fog across most of the South Florida peninsula with periods of
IFR ceiling and visibility restrictions possible all terminals
through at least 13z and could persist to near 14z, will amend as
needed. A diffuse cold front will pass into and across South
Florida later today, although IFR restrictions not anticipated.
Light southwesterly winds this morning will transition to
northwesterly around 18z and increasing to 10 to 15 knot range
with higher gusts possible.
60/BD
PREV DISCUSSION... /issued 451 AM EST Thu Feb 9 2017/
DISCUSSION...
Today through Friday: Latest surface analysis shows a cold front
draped along the Southeast CONUS from the Carolinas down towards
southern Texas. This feature will be the main influence for our
weather during the next 24-hours. Persistent light west-southwest
flow, ahead of the front, has helped to increase low level
moisture. With clear skies and good radiational cooling in place,
temperatures will continue to fall to their dewpoint through the
next several hours. Fog, with visibility down to near 1/4 mile,
has already been reported between mile marker 30 and 50 on I-75.
Areas of fog should become more widespread with time, affecting
all zones though day break. The SREF model progs the fog to erode
between 7 and 10 am, as the sun begins to heat the surface.
Limited moisture today and weak instability may be enough to
produce a few spotty showers this afternoon. Hi-Res models
indicate most of the activity to remain over the central and
northern portions of the CWA. Maximum temperatures will be toasty
again today with only a few clouds around and light westerly flow.
Forecast highs are in the low to mid 80s, around 6 to 8 degrees
above normal for this time of year. These values will also be
approaching daily maximum records. Both the GFS and ECMWF have
been consistent with dropping the aforementioned cold front
southward over the region tonight. On Friday, behind the frontal
boundary, winds will shift to the north, advecting in a cooler and
drier airmass. Max temps are may only reach the mid 70s, a couple
degrees cooler than normal.
Saturday through mid next week: A rather seasonal and benign weather
patten is expected to develop. Long range models build an upper
level ridging pattern over the southeast CONUS. Subsidence aloft
should help to bring a slow warning trend back to South Florida.
Surface high pressure drifting across the western Atlantic will
generate light easterly low-level flow over our region. Otherwise,
dry conditions are forecast to prevail. Our next chance for
measurable precipitation appears to be mid to late next week,
when the next cold front approaches.
MARINE...
West winds will gradually veer to the northwest 10-20 KT by this
afternoon. Small craft should exercise caution. A passing cold
front tonight into Friday morning will increase northerly winds
and waves across the waters. Wave heights tonight may range from 6
to 9 feet, highest along the Gulf Stream. Seas will begin to
slowly lower late Friday through the weekend.
AVIATION...
Light westerly wind, saturated low-levels, and clear skies are
allowing fog to develop early this morning, and expect IFR/LIFR at
climatologically favored KTMB and KAPF to continue through at
least 13z. Restrictions also possible pretty much everywhere but
KFLL, but confidence is too low to include in TAFs ATTM. After fog
gives way, expect occasional 4-12 KFT CIGS to occur during the
afternoon, before clearing skies tonight. SW winds this morning
will turn WNW, with some gusts approaching 20 KT this afternoon as
a cold front moves through the area. Late tonight, guidance
suggests onshore flow developing along east coast terminals, but
this should hold off until after daybreak Friday.
&&
.PRELIMINARY POINT TEMPS/POPS...
West Palm Beach 62 75 63 76 / 10 0 0 0
Fort Lauderdale 67 74 65 76 / 10 0 0 0
Miami 65 76 64 78 / 10 0 0 0
Naples 58 78 57 79 / 0 0 0 0
&&
.MFL WATCHES/WARNINGS/ADVISORIES...
FL...None.
AM...Small Craft Advisory from 7 PM this evening to 1 PM EST Friday
for AMZ650-651-670-671.
GM...Small Craft Advisory from 7 PM this evening to 1 PM EST Friday
for GMZ656-657-676.
&&
AVIATION...60/BDHazardous Weather Outlook for South Florida National Weather Service Miami FL 1025 AM EST Thu Feb 9 2017 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 100330- Lake Okeechobee-Biscayne Bay- Coastal waters from Jupiter Inlet to Deerfield Beach FL out 20 NM- Coastal waters from Deerfield Beach to Ocean Reef FL out 20 NM- Waters from Jupiter Inlet to Deerfield Beach FL from 20 to 60 NM- Waters from Deerfield Beach to Ocean Reef FL from 20 to 60 NM excluding the territorial waters of Bahamas-Glades-Hendry- Inland Palm Beach-Metro Palm Beach-Coastal Collier-Inland Collier- Inland Broward-Metro Broward-Inland Miami-Dade-Metro Miami-Dade- Mainland Monroe-Coastal Palm Beach-Coastal Broward-Coastal Miami- Dade-Far South Miami-Dade- Coastal waters from Chokoloskee to Bonita Beach FL out 20 NM- Coastal waters from East Cape Sable to Chokoloskee FL out 20 NM- Waters from Chokoloskee to Bonita Beach FL from 20 to 60 NM- 1025 AM EST Thu Feb 9 2017 ...HAZARDOUS MARINE CONDITIONS POSSIBLE TONIGHT... This hazardous weather outlook is for South Florida. .DAY ONE...Today and Tonight Wind: Northerly winds may exceed 20 knots overnight across much of South Florida's Atlantic and Gulf waters. Waves: Seas may build to 5 to 8 feet, except for the Gulf Stream waters with seas from 7 to 9 feet possible. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Hazardous marine conditions due to winds and seas are likely Friday and Friday night. Onshore winds on Atlantic beaches Friday could lead to at least a Moderate Risk for Rip Currents. Similar conditions may persist into the weekend. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. For more information...visit the National Weather Service in Miami website at www.weather.gov/miami.
The Miami radar (KAMX), 96 km away, was scanning. The volume nearest the first event began at 20:14 UTC.
1 hail. Local standard time, as filed.
Pea to dime sized hail was reported near the intersection of Jog Road and Linton Boulevard in Delray Beach. Additional pea sized hail reports were received around the same time across the western side of the city.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2017Every state in 2017This day in weather historyWarnings in Florida, February 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 679502.