Ballyhaise Ground Temp Dec 2008 and Black Ice

Cavanbhoy

Hi can anyone tell me how I could find the ground temps for Ballyhaise on 4th Dec 2008 in the morning and if so would black ice have been possible.Thanks for any help

MetLuver

Here is a link for the Met.ie monthly weather summaries, once there just select year and month/period.

http://http://www.met.ie/climate/monthly-weather-reports.asp

I do remember that around dec 08 was pretty cold a lot of the time so black ice would certainly have been possible.

Lumi

The Met Eireann weather diary entry for 4th Dec 2008 reports that following a showery day, ground temps fell to -2.0C overnight at Ballyhaise so black ice could well have formed
http://www.met.ie/climate/MonthlyWeather/clim-2008-Dec.pdf - see page 8

MetLuver

Here is a clip from p.8 of the pdf showing ground temp at Ballyhaise was -2.

''Thursday 4th: Rain and drizzle cleared during the night to give a showery
day. Slight to sharp frost in inland areas at first. Showers became more frequent
and heavy during the afternoon, some thundery, but many eastern areas
remained dry with sunny spells. Light westerly winds overnight, becoming
fresh southwesterly in northern areas before easing again during the evening
Rainfall: 3 to 14mm, heaviest at Birr
Temperature: max. 6°C to 11°C, min. 2°C to 7°C, ground temperatures
down to -2°C at Ballyhaise
Sunshine: trace to 5 hours, sunniest at Dublin Airport''

Harps

An hourly breakdown here, the air temp was as low as -2.9C so ground temps would have been a few degrees lower again, as people have said black ice definitely likely

http://www.ogimet.com/cgi-bin/gsynres?ind=03979&lang=en&decoded=yes&ndays=2&ano=2008&mes=12&day=04&hora=18

Cavanbhoy

Thank you all for all your help

Hi Harps Could you explain the likehood of black ice on Dec 4th around 8/9 am thanks in layman terms

Larbre34

If this is for a road accident case, you will have to go directly to the Met to get anything remotely admissable.

axe2grind

Just seen this.

IMO opinion extremely unlikely to be black ice on morning of 4th. The quoted ground temperature is measured on grass and it would need to be colder than -2C for black ice especially with 15km/h breeze, air temp of +3C and higher earlier in night during the drizzle.

The low temp Harps referred to is on the morning of the 3rd.

Having said the above I fully agree with Larbre34

highdef

axe2grind wrote: »

Just seen this.

IMO opinion extremely unlikely to be black ice on morning of 4th. The quoted ground temperature is measured on grass and it would need to be colder than -2C for black ice especially with 15km/h breeze, air temp of +3C and higher earlier in night during the drizzle.

The low temp Harps referred to is on the morning of the 3rd.

Having said the above I fully agree with Larbre34

Would have to disagree. There's a stretch of road not far from my home which is very susceptible to black ice, due to elevation, shelter and lack of sun in winter months. I've driven on this stretch of road and it has been like glass even when air temperatures had risen to 3 or 4C during the morning period. There are times when it will stay icy for days on this stretch of road when every other road I would travel on the way to/from Dublin and home would be ice free.