Weather at time of accident

luvthe9

luvthe9

Veteran
Aug 30, 2002
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KMDW 082353Z COR 10009KT 1/4SM SN FZFG VV001 M03/M04 A3009 RMK AO2 SLP207 R31C/3000FT SNINCR 3/9 4/009 P0000 60000 T10331044 11033 21056 56040
KMDW 082316Z COR 08010KT 1/2SM SN FZFG BKN002 OVC009 M03/M05 A3011 RMK AO2 R31C/3500 SNINCR 2/5 P0000
KMDW 082253Z 09012KT 3/4SM -SN BR BKN004 OVC009 M03/M05 A3012 RMK AO2 SLP216 R31C/5000FT SNINCR 2/5 P0000 T10331050
KMDW 082250Z 08011KT 3/4SM -SN BR SCT004 OVC009 M03/M05 A3012 RMK AO2 R31C/5000FT SNINCR 2/5 P0000
KMDW 082153Z COR 08011KT 1/2SM SN FZFG VV003 M04/M06 A3016 RMK AO2 SLP231 R31C/5000FT SNINCR 1/3 P0000 T10441061
KMDW 082138Z 06011KT 1/2SM SN FZFG VV003 M04/M06 A3017 RMK AO2 R31C4000FT P0000
KMDW 082053Z 08008KT 1/4SM SN FZFG VV002 M05/M07 A3021 RMK AO2 SLP249 R31C/3000FT P0000 60000 T10501067 58051
KMDW 082035Z 08009KT 1/2SM SN FZFG VV004 M05/M07 A3023 RMK AO2 PRESFR R31C/3000V4500FT P0000
KMDW 082007Z 09009KT 1/2SM SN BKN007 OVC019 M04/M09 A3026 RMK AO2 R31C/4000V5500FT P0000
KMDW
 
luvthe9 said:
KMDW 082353Z COR 10009KT 1/4SM SN FZFG VV001 M03/M04 A3009 RMK AO2 SLP207 R31C/3000FT SNINCR 3/9 4/009 P0000 60000 T10331044 11033 21056 56040
KMDW 082316Z COR 08010KT 1/2SM SN FZFG BKN002 OVC009 M03/M05 A3011 RMK AO2 R31C/3500 SNINCR 2/5 P0000
KMDW 082253Z 09012KT 3/4SM -SN BR BKN004 OVC009 M03/M05 A3012 RMK AO2 SLP216 R31C/5000FT SNINCR 2/5 P0000 T10331050
KMDW 082250Z 08011KT 3/4SM -SN BR SCT004 OVC009 M03/M05 A3012 RMK AO2 R31C/5000FT SNINCR 2/5 P0000
KMDW 082153Z COR 08011KT 1/2SM SN FZFG VV003 M04/M06 A3016 RMK AO2 SLP231 R31C/5000FT SNINCR 1/3 P0000 T10441061
KMDW 082138Z 06011KT 1/2SM SN FZFG VV003 M04/M06 A3017 RMK AO2 R31C4000FT P0000
KMDW 082053Z 08008KT 1/4SM SN FZFG VV002 M05/M07 A3021 RMK AO2 SLP249 R31C/3000FT P0000 60000 T10501067 58051
KMDW 082035Z 08009KT 1/2SM SN FZFG VV004 M05/M07 A3023 RMK AO2 PRESFR R31C/3000V4500FT P0000
KMDW 082007Z 09009KT 1/2SM SN BKN007 OVC019 M04/M09 A3026 RMK AO2 R31C/4000V5500FT P0000
KMDW
Click to expand...

Translation?
 
wnbubbleboy said:
Translation?
Click to expand...

I'll break it down so you can translate it for yourself. The last entry read as follows:

KMDW 082007Z 09009KT 1/2SM SN BKN007 OVC019 M04/M09 A3026

translated:

KMDW ( Midway Airport ) 082007Z ( date 08th ) ( time 20:07 zulu or GMT ) 09009KT ( wind from east 90 degrees blowing at 9 knots,or 10mph )1/2SM (visibility 1/2 statue mile) SN ( snowing )BKN007 ( cloud cover broken layer at 700 feet) OVC019 ( another layer of clouds overcast at 1,900 ft ) A3026 (alt setting 30.26 inches)

Put it together and it was snowing with a 10 mph wind from the east, and the clouds were low in layers one broken at 700, one solid at 1900. You could expect to see about half a mile in the snow.

The data is in reverse order so the last entry is actually the 1st and the 1st is actually the last. So the last one shows much worse conditions. it reads;

KMDW 082353Z COR 10009KT 1/4SM SN FZFG VV001 M03/M04 A3009 R

translated:

Midway at 23:52 on the 8th. wind still east 100 degrees at 10 knots ( 12 mph ) 1/4 mile visibility in snow and freezing fog ( FZFG ) veritical Visibility ( VV ) 100 ft. ALt was much lower ( usually a sign of worse weather ) at 30.09
 
rocaduro said:
I'll break it down so you can translate it for yourself. The last entry read as follows:

KMDW 082007Z 09009KT 1/2SM SN BKN007 OVC019 M04/M09 A3026

translated:

KMDW ( Midway Airport ) 082007Z ( date 08th ) ( time 20:07 zulu or GMT ) 09009KT ( wind from east 90 degrees blowing at 9 knots,or 10mph )1/2SM (visibility 1/2 statue mile) SN ( snowing )BKN007 ( cloud cover broken layer at 700 feet) OVC019 ( another layer of clouds overcast at 1,900 ft ) A3026 (alt setting 30.26 inches)

Put it together and it was snowing with a 10 mph wind from the east, and the clouds were low in layers one broken at 700, one solid at 1900. You could expect to see about half a mile in the snow.

The data is in reverse order so the last entry is actually the 1st and the 1st is actually the last. So the last one shows much worse conditions. it reads;

KMDW 082353Z COR 10009KT 1/4SM SN FZFG VV001 M03/M04 A3009 R

translated:

Midway at 23:52 on the 8th. wind still east 100 degrees at 10 knots ( 12 mph ) 1/4 mile visibility in snow and freezing fog ( FZFG ) veritical Visibility ( VV ) 100 ft. ALt was much lower ( usually a sign of worse weather ) at 30.09
Click to expand...


What airport does WN generally designate as the alternate for MDW?
 
desertfox said:
What airport does WN generally designate as the alternate for MDW?
Click to expand...
Alternate airports aren't "canned." A legal alternate has to meet specific weather conditions and forecasts to be designated. On that night I'd expect something in the Kansas City or Omaha area (west of Chicago where the weather had already cleared) to be the nearest legal alternate.

Here's a link to the FAA's official preliminary data that includes the actual weather at the time of the mishap. Scroll down to event number 4.

http://www.faa.gov/data_statistics/acciden...ia/A_1209_N.txt
 
NewHampshire Black Bears said:
Any info on who landed just before WN ??

(time elapsed, conditions, type of a/c and what "paint job")

Thanx,

NH/BB's
Click to expand...

I seem to recall a report that said that a corporate aircraft ("bizjet"--don't know what make/model) was the arrival immediately preceeding WN1248. Also recall that pilot of same reported 'fair to poor" braking conditions on the runway.
 
rocaduro said:
I'll break it down so you can translate it for yourself. The last entry read as follows:

KMDW 082007Z 09009KT 1/2SM SN BKN007 OVC019 M04/M09 A3026

translated:

KMDW ( Midway Airport ) 082007Z ( date 08th ) ( time 20:07 zulu or GMT ) 09009KT ( wind from east 90 degrees blowing at 9 knots,or 10mph )1/2SM (visibility 1/2 statue mile) SN ( snowing )BKN007 ( cloud cover broken layer at 700 feet) OVC019 ( another layer of clouds overcast at 1,900 ft ) A3026 (alt setting 30.26 inches)

Put it together and it was snowing with a 10 mph wind from the east, and the clouds were low in layers one broken at 700, one solid at 1900. You could expect to see about half a mile in the snow.

The data is in reverse order so the last entry is actually the 1st and the 1st is actually the last. So the last one shows much worse conditions. it reads;

KMDW 082353Z COR 10009KT 1/4SM SN FZFG VV001 M03/M04 A3009 R

translated:

Midway at 23:52 on the 8th. wind still east 100 degrees at 10 knots ( 12 mph ) 1/4 mile visibility in snow and freezing fog ( FZFG ) veritical Visibility ( VV ) 100 ft. ALt was much lower ( usually a sign of worse weather ) at 30.09
Click to expand...

Thank you.
 
Relying on braking actions reports is something that cannot be relied on by itself. It allows personal opinion into the decision making process regarding safety. The FAA wants airports to rely on scientific data in regards to braking action on runways to help protect them for liability reasons. The coefficient of friction(Mu)is what is measured for scientific data that is givien to the airlines per the ACM(airport). Anything under 40 for the coefficient of friction is NOTAMable for the FAA. If you look up the performance data between airlines, they also have different conversions between the Mu value and what they consider Good, Fair, Poor, etc. with Pireps.

For example, according to our charts, a Mu value of 30 is considered poor by Southwest, fair by American, Poor by Delta, Fair by US Airways, Fair by United Airlines,Fair by Northwest Airlines, and Good by Continental Airlines.
 
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