Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
wet, windy, cold, thunderstorm, snowy weather returning ?
#11
Good Advice Tom. I ran the generator yesterday. A week of high winds, lightning, and flash flooding can beat up a 19th century power grid pretty badly, and with dark rainy clouds and heavy rain forecast we're unlikely to get any solar power or hot water for the next week. And look at the cold that is coming!

Area Forecast Discussion
National Weather Service Honolulu HI
404 AM HST Sun Mar 7 2021

.SYNOPSIS...
Unsettled weather is likely for the upcoming week as an upper
level disturbance interacts with tropical moisture. Breezy trade
winds will give way to light and variable winds by mid week as a
surface trough forms over the state. Strong northeast winds will
then follow Friday over Kauai, and to the remaining islands over
next weekend.

&&

.DISCUSSION...
Although the evening has been rather tame, there are a couple of
spots that we are watching closely. The two areas are windward
Kauai and windward Haleakala above Hana, where heavy showers are
occurring.

There has been a significant shift in the wind forecast during the
second half of the week. Instead of strong and gusty trade winds
through the week, models are suggesting a surface trough forming
over the islands Tuesday and remaining in the vicinity of the
state through Friday. Strong and gusty northeast winds are
expected to build back in to the area next weekend as high
pressure passes north of the islands.

Another addition to the forecast is a slight chance of
thunderstorms has been introduced for the Big Island and windward
Maui starting this afternoon and remaining in forecast through at
least Monday. The rest of the forecast package is pretty much the
same, that is it will be showery for most of the week. This
prolonged period of unsettled weather will likely warrant a Flash
Flood Watch for most if not all of the islands and a Winter
Weather Advisory for the Big Island Summits.

An east to west oriented upper level trough with cold temperatures
of around minus 13 degrees C is located just north of the islands
this morning. An upper low is forecast to form later today west
of Kauai as enhanced low level moisture moves toward the Big
Island from the southeast. This moisture will then spread up the
island chain through Monday night. The upper low then drifts over
the islands by Wednesday night and stalls through Friday. The
combination of the cold temperatures aloft and the moist air mass
near the surface will likely result in an extended period of heavy
rains and possible thunderstorms.

&&

https://forecast.weather.gov/product.php?site=HFO&issuedby=HFO&product=AFD&format=CI&version=1&glossary=1
Reply
#12
Thanks, terracore, for the detailed discussion from the NWS. I've never understood why their official forecasts for Puna such as the one in this link are so conservative and often underestimate rainfall by a wide margin:

https://forecast.weather.gov//MapClick.php?lat=19.58308121001252&lon=-154.98001098632812&site=hfo&smap=1&marine=0&unit=0&lg=en#.YEUVGmhKjIV

I find Weather Underground to be more realistic.
Reply
#13
From my amateur research, the models are all over the place (when it comes to severity) on this one. The NWS should have a more accurate outlook in a day or two. Regardless, the crap weather is starting shortly, and will likely significantly progress in it's intensity this evening.
Reply
#14
FLASH FLOOD WATCH
ISSUED: 11:21 AM MAR. 7, 2021 – NATIONAL WEATHER SERVICE
...FLASH FLOOD WATCH IN EFFECT FROM 6 PM HST THIS EVENING THROUGH
LATE TUESDAY NIGHT...

The National Weather Service in Honolulu has issued a

* Flash Flood Watch for the Big Island.

* From 6 PM HST this evening through late Tuesday night

* Deep moisture will spread over the Big Island from the southeast
tonight and Monday, then linger into at least Tuesday, bringing
the potential for persistent heavy rain that could lead to flash
flooding.

* Flood prone roads and other low lying areas may be closed due to
elevated runoff and overflowing streams. Landslides may also occur
in areas with steep terrain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be prepared to take action if a Flash Flood Warning is issued. If
you experience heavy rain or rising waters, head to higher ground
immediately.

A Flash Flood Watch means that conditions are favorable for flash
flooding. Flash Flooding is LIFE THREATENING. Do not cross fast
flowing water in your vehicle or on foot.
Reply
#15
Harry just posted this :

"Incredible, but the models are showing a completely saturated atmosphere to well above our mountain tops tonight through the next 120 hours... dang, we're going to get swamped."
Reply
#16
We got 4+" yesterday, most of that was in the evening. The rain was overflowing our gutters for a few hours. It lightened up a bit after midnight, getting "only" an inch until dawn.
Reply
#17
Here in central HPP we got 3.2 yesterday and .94 since midnight. Same peak hours as terracore. Weather Underground is predicting 5 inches for today, then tapering off to 2.2 tomorrow. My dogs will be spending a lot of time with their legs crossed.
Reply
#18
Down on lower Makuu 1.68 yesterday and.67 so far today.

My weather station if you want live weather.

https://www.wunderground.com/dashboard/pws/KHIKEAAU41
Reply
#19
Your web page on Wunderground is really cool, Obie. I hope the low wind speed trend continues as we are far less likely to have power outages at that level. Early in the runup to this event, higher winds were anticipated.
Reply
#20
If you go here, you can zoom in and find one closer to you.

https://www.wunderground.com/wundermap
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)