Area Forecast Discussion
Issued by NWS Miami, FL
Issued by NWS Miami, FL
Versions:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
636 FXUS62 KMFL 220535 AFDMFL Area Forecast Discussion National Weather Service Miami FL 135 AM EDT Wed May 22 2024 ...New AVIATION... .UPDATE... Issued at 732 PM EDT Tue May 21 2024 A few outflow boundaries still linger over Miami-Dade and Broward county, which could spark a quick shower or two before the evening hours are over. Can`t rule out a brief thunderstorm, mainly along the Atlantic coast, but mesoanalysis and observations suggest the air mass in general is becoming more stable. Overnight lows have been adjusted just a bit lower as rain and cloud cover earlier today brought a much welcomed cooling this afternoon to many Atlantic areas of SoFlo, with some places experiencing up to a 20 degree cooling down with thunderstorm activity. Expect upper 60s over interior areas, and low to mid 70s elsewhere. The rest of the forecast elements look good and no further adjustments are required for the evening update. && .SHORT TERM... (Rest of today through Wednesday) Issued at 1226 PM EDT Tue May 21 2024 A weak frontal boundary remains oriented from east to west just south of the area. Taking a peek aloft, a shortwave remains just to the northeast gradually shifting eastward into the western Atlantic waters. 500mb flow on the posterior side of this feature will maintain westerly to northwesterly mid-level flow across the region today. The combination of stronger easterly/northeasterly flow at the surface and north westerly flow aloft will act to focus sea- breeze driven convection southward across the region, with the greatest chances of precipitation across our southern areas (particularly Miami-Dade County and Mainland Monroe) during the afternoon hours today. Mesoscale models indicate the potential of an SBCAPE gradient in conjunction with the inward propagating Atlantic sea- breeze, enhanced ascent along this boundary will lead to convective initiation during the early afternoon hours. Although overall severe parameters do not appear to be too conducive, there will still be the potential for an isolated strong to severe storm or two across southern portions of the area. DCAPE values of 1000-1200+ J/kg support the potential of wet microbursts with the strongest convective updrafts. In addition, Although the axis of the shortwave has propagated offshore of the CONUS, South Florida will remain on the periphery of the cold pool aloft with 500mb temperatures sitting around -9 C. This could allow for some small hail to fall if a taller core develops. In addition, although antecedent conditions remain fairly dry across the southern portions of the east coast metro area, cannot rule out some pockets of minor urban flooding in vulnerable low lying locations given the relatively light 500mb flow. High temperatures will reach the upper 80s to low 90s across the region, with the warmest temperatures being realized across southwestern Florida. With the shortwave continuing to propagate to the east on Wednesday, 500mb flow will veer more to a northerly direction in nature. Combined with northeasterly surface flow prevailing, sea-breeze circulations will favor convective initiation across the southern inland portions of our area. As the shortwave continues to propagate away, 500mb temperatures will continue to warm with 500mb temps in the -5C to -6C range possible. This will keep the majority of thunderstorm activity in the garden variety form, although localized ascent along boundary collisions could still support the potential of an isolated strong to severe wet microburst if a storm pulses up && .LONG TERM... (Wednesday night through Monday) Issued at 247 AM EDT Tue May 21 2024 During the mid-week period, the mid-level shortwave will remain situated over the western Atlantic waters to the east of the Bahamas. A mid-level ridge will also develop and remain centered over the western Gulf of Mexico during this time frame. Between these two synoptic features, South Florida will remain in a light northerly 500mb flow regime with a lack of synoptic forcing across the area with the subtropical jet located well to the north of our region. At the surface, ridging situated over the southeastern United States will allow for relatively light winds across the region. Therefore, with a lack of the aforementioned synoptic support, mesoscale patterns, such as the sea-breeze circulation, will dictate temperatures and the most probable locations for convective initiation and coverage. Typical thunderstorm hazards, such as heavy rainfall and gusty winds, will be possible, but still cannot rule out isolated strong to severe pulse storms that are able to take advantage of the localized maximized ascent along boundary collisions even in the background of a fairly benign pattern. The mesoscale driven weather pattern will continue for much of the long-term period as surface ridging remains firmly in place and synoptic features remain to the north of South Florida. With the advection of the surface ridge to the east, easterly surface flow across the region will remain dominant. This will act to feature the hottest temperatures across southwestern Florida for the time being as the Atlantic sea-breeze is able to traverse further inland. High temperatures will range from the upper 80s to low 90s across the east coast of South Florida to temperatures in the low to mid 90s across southwestern Florida. Although heat indices will be less oppressive than the past couple of days, heat safety precautions should still be followed, especially for vulnerable populations. && .AVIATION... (06Z TAFS) Issued at 130 AM EDT Wed May 22 2024 Mainly VFR conditions will prevail throughout the forecast period. Light and variable winds overnight will increase out of the east later Wednesday morning. Scattered showers and storms may develop across interior sections this afternoon as the sea breezes push inland. Most of the activity should remain away from the terminals, however, it may get close to KOPF, KMIA, and KTMB during the afternoon and evening hours. At KAPF, winds will increase out of the west southwest this afternoon. && .MARINE... Issued at 1226 PM EDT Tue May 21 2024 Generally benign conditions should prevail across local waters throughout the period. Locally enhanced winds and seas will be possible in and around shower and thunderstorm activity across our && .BEACHES... Issued at 1226 PM EDT Tue May 21 2024 With onshore wind flow returning to the east coast of South Florida, a gradual increase in rip current risks will materialize across the east coast through the remainder of the work-week. A moderate risk of rip currents is forecast for Palm Beach County beaches today. && .PRELIMINARY POINT TEMPS/POPS... Miami 90 77 91 77 / 40 20 30 10 West Kendall 90 74 91 73 / 40 20 30 20 Opa-Locka 90 76 91 76 / 40 20 30 10 Homestead 88 76 89 76 / 40 30 30 20 Fort Lauderdale 89 77 90 77 / 40 10 30 20 N Ft Lauderdale 89 76 91 76 / 40 10 30 10 Pembroke Pines 89 77 91 77 / 40 10 30 10 West Palm Beach 89 73 89 74 / 20 10 20 10 Boca Raton 88 75 89 76 / 30 10 30 10 Naples 92 75 92 76 / 30 30 30 10 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && $$ SHORT TERM...Rizzuto LONG TERM....Hadi AVIATION...CWC