| Current Conditions | ||
| Temp |  | 8.6 C |
| RH | | 9 % |
| Wind | | NE 10 mph |
| Road | | Open (4x4) |
|
Menu of Text Products for the Hawaiian Islands and the Tropical Pacific/Atlantic Oceans: |
|
Narrow the Menu List Select Time Limit: 12 hours | 24 hours | 48 hours | 72 hours | No time limit Select Product Type: All | Routine Bulletins/FCSTS | Warnings/Watches/Advisories | HAWN Weather | Tropical | Marine | Aviation | Daily Obs | Special |
|
|
Hawaiian Islands Synoptic Discussion and Guidance 713 FXHW60 PHFO 281940 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 940 AM HST Wed Jun 28 2017 .SYNOPSIS... Breezy trade winds associated with high pressure north of the state will continue through Friday, before slightly trending down over the upcoming weekend. Dry and stable conditions will limit shower activity over the state through Thursday. Showery weather will become more likely beginning Thursday night and continuing through the weekend. Windward and mountain areas will be the focus for most of the shower activity. && .DISCUSSION... Upper level ridging over the state is supporting continued dry and stable conditions aloft this morning. A near typical inversion height around 6 to 7 thousand feet is keeping clouds and showers limited in areal extent. These mainly dry conditions are expected to continue statewide in the short term as the surface trade wind flow remains in place due to the persistent surface ridge far to the north. Limited moisture riding along in these trade winds supports a forecast of mainly sunny and breezy conditions today. For tonight and Thursday, little change in conditions is depicted. However, on Thursday night, all of the more reliable model guidance is showing an increase in moisture moving across the state from the northeast and east. Thus, there is an increasing likelihood for showery weather to return, especially windward and mountain areas. The trades will be strong enough for some of the showers to reach leeward areas as well. These wetter trade wind conditions will likely continue into the weekend. There will probably be daily variations in the shower distribution and trade wind fluctuation, but for now will keep a generally wetter trend in the forecast, which can be refined as the time approaches. On Monday, the guidance is in agreement showing a batch of drier and more stable air moving over the state in increasing trades, thus giving our area breezy conditions, with locally strong gusts as high pressure remains north of the state. && .AVIATION... Fresh to locally strong trade winds will continue today. AIRMET TANGO remains posted for low level turbulence over and immediately south through west of the mountains. Morning soundings show a strong low level inversion between 6-7 kft. The elevated wind speeds and a stable atmosphere will help support the formation of mountain waves downstream of the ranges. Any cloud build ups and isolated showers will favor the windward and mountain areas. Expect prevailing VFR conditions across the islands today. Some passing clouds and showers may bring brief MVFR conditions, mainly CIGS due to low stable clouds. && .MARINE... The Small Craft Advisory (SCA) includes the Kaiwi Channel, Maui windward waters, Oahu leeward waters, the typical windy zones around Maui and the Big Island. The SCA is in effect through Thursday, and may continue for some zones into Friday, followed by slightly weaker trade winds this weekend. The locally strong trades will produce choppy surf along east facing shores through the rest of the work week. A small short- period northwest swell is also forecast from Friday into this weekend. Small pulses of swell energy from the southeast through southwest will continue bringing near normal summertime surf along south facing shores. Reinforcing long-period south swells will generate a slight bump in surf heights from Thursday into the weekend. && .HFO WATCHES/WARNINGS/ADVISORIES... Small Craft Advisory until 6 PM HST Thursday for Oahu Leeward Waters-Kaiwi Channel-Maui County Windward Waters-Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters. && $$ Discussion...Brenchley Aviation...Eaton Marine...Foster Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
|