Presentation on theme: "Conditional Climatology Tools"— Presentation transcript:
1 Conditional Climatology Tools AvnFPS 3.2Intent is for Aviation FP’s, SOO’s, RAM’s and anyone else that interested.We assume that you’ve seen the Camtasia presentation and are at least somewhat familiar with the new software.The case we’ll look at today has a handout that you hopefully downloaded and have available – if not, it’s not a big deal.Please mute your phone and feel free to mark a question on the screen at any time (make question mark on screen)This session should last about 1 hour.
2 ContributorsWhile we enjoyed putting training together – we’re not a bunch of monkeys. Thought some may think otherwise.
3 Contributors Mike Graf (NWS Headquarters) Jerry Griffin (NWS Training Center)David Hotz (WFO Morristown, TN)Todd Lericos (WFO Caribou)Cammye Sims (WFO San Antonio)Mark Struthworf (WFO Salt Lake City)Jeff Tongue (WFO New York City)Aviation Services branch at Headquarters tasked this group of operational NWS meteorologists to developed a training package.We all helped put this together and believe that it will help you. Integration of new techniques and software into the operational field offices of NWS is a difficult task – our intent is to help you show these benefits to your staff.
4 Objectives Describe Conditional Climatology DefinitionBenefits/LimitationsDiscuss new AvnFPS 3.2 climatology toolsWind RoseCIG/VSBY DistributionsCIG/VSBY TrendsDiscuss current forecast methods/limitationsAdding Conditional Climatology to the Forecast ToolkitInterpret and apply the outputCase studiesLocal case studiesA brief section on what Conditional Climatology is and some Benefits/LimitationsDiscuss the tools spending most of our time on the CIG/VSBY Trends toolDiscuss current cig and visby forecast methods/limitationsLeading to why Conditional Climatology is neededFinal we have a brief case study that explain the how to integrate that and serve as model for you to use for your own cases.
5 What is Conditional Climatology? A distribution of variables now and in the future based on one or more given conditions.Examples:Pattern RecognitionConceptual ModelsLocal Rules of ThumbForecaster ExperienceIf you look in the glossary, you won’t find a definition for Conditional Climatology. This is our definition - A distribution of variables now and in the future based on one or more given conditions.If you think about it – a lot of tools we use are conditional climatology. From read sky at night, sailors delight to the Norwegian cyclone model associating over running and strataform clouds and precip with a warm front.Our experience of knowing how the atmosphere behaves in a certain situation is conditional climatology. We know what happens when these conditions are present. That’s what we’re trying to do here.
6 Role of Conditional Climatology in Aviation Forecasting Conditional Climatology Tables - USAF1970’s to presentNumerical modelsMOS2000’sIntegration of CC back into the aviation forecast processIn terms of Aviation Forecasting, Conditional Climatology is not new.However, It seemed to have gotten lost as we moved into the numerical model era over the past 30 years.Raw model output and MOS have squeezed CC a bit out of the picture.Unfortunately, as we’ll see, numerical techniques have significant limitations when is comes to Ceiling and visibility forecasting.Thus – re-integrating these old proven techniques can provide us with significant value and improvement of our forecasts.
7 Benefits of Conditional Climatology? Guidance on event duration, intensity and trendsLimits over forecasting of rare eventsIncreases forecaster confidenceBetter results than just using persistence forecasting or NWP/MOS guidanceHere are some of the benefits we see.The bottom line is that CC is not a magic solution – but that it can when applied correctly with other techniques to provided improved forecasts.
8 Limitations of Conditional Climatology Can not be used alone!Does not discriminate physical processesMay not be useful in extreme or rare weather eventsNot fool proofAgain – were not advocating that CC will always help or that forecasters should always use it.The fact is that CC often is not of much help…but can be especially useful during those significant high impact aviation events.CC really helps when you have low confidence in a forecast or when:you need to select timingwhen you need to chose a most likely scenario.
9 Wind Rose ToolThe first tool we’ll discuss is the wind rose tool. While we don’t envision forecasters looking at these when making a TAF, we do think that focal point should make them available in a seasonal aspect. Perhaps post them on your internal web and have your forecasters look at them to get a seasonal refresher.Here we have afternoon winds (15-03Z) at San Antonio in July. Note the prevailing SSE directionWe found that configuring the tool to 16 points is best.You should note that these are not the “common” wind rose displays that you’re use to seeing. The area covered by the shading is relate to the frequency of occurrence and that the percentage rings are logarithmically space – please look at the documentation for more details.***SOOs and FPs – these data (which is output-able in ascii text) may be helpful for local research studies.
10 Applied Wind RoseHere an interesting Aviation application – the same period is used – but this time we only display the wind rose when IFR conditions are occurring. Note that the easterly direction is much more likely to occur.
11 CIG/VSBY Distribution Tool The second tool - is probably the most easiest to understand. These are cumulate frequencies.Again – you may wish to use these in season refresher – here we see the fall season for KMCI. Note the times here of increased of IFR in the morning and the relative quick drop off of the through the morning.
14 Why are we here?Look like anyone you know?SOO Intern Lead General
15 Why are we here? SOO Intern Lead General The SOO is killing me with all this TrainingWhy are we here? , Why was this training developed in addition to the Camtasia “knobology” trainingOur group was made up of operational forecasters and we’re attempting to help improve our forecasting skills with relation to Aviation and TAF’s. We felt we need to help the focal points and SOO’s to fully understand these new tools so that you can help your local staff’s make the most of these new tools in AVNFPS 3.2SOO Intern Lead General
16 CIG/VSBY Trend ToolThe ceiling and Visibility trend tool is by far the most powerful and unfortunately more complicated tool.It can directly affect probably our most difficult forecast challenges – ceiling height and visibility.
17 How Do You Forecast Ceiling Height and Visibility???? Before we look at the AVNFPS 3.2 tool – lets look at how a TAF ceiling and visibility forecast is prepared.
18 How Do You Forecast Ceiling Height and Visibility????
19 How Do You Forecast Ceiling Height and Visibility????
20 How Do You Forecast Ceiling Height and Visibility????
21 How Do You Forecast Ceiling Height and Visibility????
22 How Do You Forecast Ceiling Height and Visibility????
23 What Tools Do you Use?If you ask your forecasters or yourself what they use to forecast ceiling heights or visibility – you’ll get some interesting answers. As we all know, forecasting ceiling and visibility to nearest 100 ft for ceiling and ¼ mile for visibility is not an easy task.PAUSE TO ASK QUESTION OF PARTICIPANTS –Round robin with all attendees OR select one or two offices.
24 What Tools Do you Use? Current Observations Satellite MOS Soundings / BUFKITModel DataLocal StudiesAdvectionConvectionPersistenceThese are some that we came up with – with the emphasis on the current observations including radar and satellite. Also MOS is a critical factor.Of course forecaster experience is critical too !
25 What Tools Do you Use? Current Observations Satellite MOS Soundings / BUFKITModel DataLocal StudiesAdvectionConvectionPersistenceAnd as any aviation forecaster, if they chose to admit it, a hot pair of dice always helps!
26 Using NWP Model Data to forecast clouds The majority of our Forecasting relies on NWP. What would we do if we didn’t get model data for a week???
27 Models Relative Humidity??? Model Clouds??? Probably the most common method to forecast clouds is to use the vertical RH distribution. Most do not look at model clouds. Unfortunately models do not predict clouds or RH, they predict mixing ratios. Post processing takes mixing ratio and converts it into RH, dew point temperature and at NCEP – clouds. A reference for this is at the end.
28 Model Soundings? This is a NAM sounding. Notice the High RH near the surface.Would you forecast IFR?
29 BUFKIT – RH and CloudsNote that the model (NAM) thinks it is clear ! At least there are no “model” clouds.
30 Relative Humidity = Clouds? Another case – Would you forecast IFR???
31 Adding “Model” CloudsModel clouds agree in IFR.
32 RH with respect to ICE or Water? Hopefully you recall form College – Clausius-Clapeyron equationGFS output is with respect to ICE in AWIPS.NAM and RUC are with respect to WATER !Plot a 300 MB RH field for yourself and see!In BUFKIT – you can calculate RH with RESPECT to ICE on the Left and With Respect to Water on the Right.RH With Respect to Water RH With Respect to Ice
33 RH Time SectionRH is NOT a great tool for cloud forecasting.
34 Model Clouds and BasesTime sections are also available for both RH and clouds in the BUFKIT overview section.
35 How good are NWP Models at predicting: Moisture?It’s Horizontal and Vertical Distribution?Cloud Ceilings?BUT – models “stink” at forecasting moisture profiles and clouds.
36 Model Output Statistics! Good idea.Removes biases.Adds Climatology.MOS provides valuable improvement to “raw” model data – remember, bufkit is Raw model data.
37 MAV MOSIs the “Weather” in Caribou the same as State College PA or New York City? Is the Weather in Atlanta the same as San Antonio?Regional Equations are used for Ceiling and VisibilityMOS equations are Regional (forecasters often do not realize this. We’re in Zone 18. Same equation is used at all the locations in zone 18. BIG Problem. (they had to do it this way to get enough statically sound regression equations)Also note that the Visby and Ceiling Equations are INDEPENDENT.Summer (Apr-Sept)Winter (Oct-Mar)
39 MAV MOSModel “Run time” plus 3 Hour Observation is Critical (03Z, 09Z, 15Z or 21Z)Use the Ceiling and Visibility Category Probabilities.Try to play up the fact that the 03,09,15 and 21z METARS are critical to the MOS calculations.For example – the 03Z Observation has a strong influence on the 00Z MOS (at least through the first few periods.If a low ceiling goes scattered for at at 03Z for a few minutes (sucker hole) – the MOS ceiling prediction will be off significantly!!
40 MOS - Ceiling and Visibility Category Probabilities. Standard MOS bulletins list only the most likely category of ceiling and vis.However, MOS actually calculates a probability for all Cig/Vvis categories (these are listed in AVNFPS)It is important to look at the distribution of possibilities in all categories rather than just the most likely category.This can help with confidence in MOS statistics– note that confidence in MOS should vary from day to day.For example, if the most likely flight category is a 3, but the probability for cat 3 is 28% and Category 2 is 27% and category 4 is 27% - then your confidence in MOS is low.
41 NGM MOS Look at NGM Synoptic Pattern Period of Record used for equation Development is Extensive02Z and 14Z Observations are criticalNGM MOS (FWC’s) are often “better” than the GFS “MAV” because of their long period of record and incorporation of climatology.
42 We need more Rules of thumb? “in this situation, the cloud base “usually” remains IFR until late morning.”CLIMATOLOGY!!!“Conditional” ClimatologyRules of thumb (like don’t forecast IFR until the second night of on shore flow is really just applied climo.MOS does better with climo, and it helps in these situations.But we can improve further (CC).
43 Example 18Z TAF John F. Kennedy International Airport May 31, 2006
44 JFK International is located in southern Queens in New York City.
46 Local Visible from 1631ZNote extent of stratus onshore.
47 17Z METARMETAR KJFK Z 14009KT 10SM BKN007 BKN250 19/16 A3020 RMK AO2 SLP226 T17UTC ObservationIFR Ceilings / VFR Vis with SE Flow
48 Situation SE Flow Prevails When and How Low does the Ceiling and Visibility Go??
49 12Z NAM-eta (Fcst Hr = 05) Valid 17Z NAM ModelValid at current time – No clouds
50 15Z RUC (Fcst Hr = 02) Valid 17Z RUC Model Valid at current time – No clouds
51 12Z NAM-eta (Fcst Hr = 14) Valid 02Z NAM model9- hours later (14 forecast point in model).High RH in lower levels – some clouds present.
52 15Z RUC (Fcst Hr = 11) Valid 02Z RUC model 9- hours later (11 forecast point in model).High RH in lower levels – no clouds present.
53 GFS MOSMOS forecast: Note the declining conditions after 03-06z. Cig and Vis are not in sync.[****NOTE to presenter: Point out that CIG and VIS calculations are done independently and that they sometimes do not make meteorological sense. For example, MOS cig/vis catagories will NOT pick up on things like stratus build-down.]
54 NGM MOSNote that Cig values are all over the place. Vis shows a general downward trend.
55 Current TAF KJFK 311509Z 311512 14009KT P6SM BKN007 TEMPO 1617 SCT007 FM KT P6SM SCT010 SCT080 SCT140FM0200 VRB04KT 1SM BR SCT004 SCT040FM0600 VRB03KT 3/4SM BR BKN004TEMPO /2SM FG VV002=This was the actual TAFStarts IFR Tempo VFR17z VFR02z VFR06z LIFR
56 Un-restricted Visibility Joint Distribution(default)May-Jun16-18ZSE Wind’Un-restricted Visibility[Explain tool briefly to get audience familiar with what they are looking at]NOTE :JOINT DISTRIBUTION: with default settings.COUNT is 19 events
59 Un-restricted Visibility Ceiling DistributionApr-mid Jun13-22ZS-E Wind’Un-restricted VisibilityKey – You must expand out your dates, times and in this case – wind direction. Note that the count value is now up to 70!Alteration to default involvedExpanding Month spanExpanding Time frameExpanding Wind directionAdjusting Ceiling to fit in IFR category
60 Un-restricted Visibility Visibility DistributionApr-mid Jun13-22ZS-E Wind’Un-restricted VisibilityVisibility distribution still shows that Ceiling is the primary cause of the restriction.
61 What Would You Forecast? [***NOTE to presenter: Be sure highlight that the probability of VFR is inherent in this graph as the white space above the bars (i.e. 100-probability of MVFR and below)][Ask question to audience; What would you forecast? (round robin or pick an office)]
62 What Was Forecast? FTUS41 KOKX 311700 TAFJFK TAF KJFK Z KT P6SM BKN007TEMPO 1923 SCT007FM KT 3SM BR BKN005FM0600 VRB03KT 1SM BR OVC004TEMPO /2SM FG VV002FM KT 5SM HZ BKN008FM KT P6SM SCT010 SCT050=This was the actual forecast that without the benefit of CC. The forecaster was thinking that the sun would continue to result in scattered varying broken ceiling.Starts IFR Tempo VFR02z IFR06z LIFR14z IFR17z VFR
63 TAF based on Climatology? KJFK Z KT P6SM BKN007FM KT 3SM BR OVC004FM KT 1/2SM FG VV002……ACTUAL TAF (no CC)KJFK Z KT P6SM BKN007TEMPO 1923 SCT007FM KT 3SM BR BKN005FM0600 VRB03KT 1SM BR OVC004TEMPO /2SM FG VV002FM KT 5SM HZ BKN008FM KT P6SM SCT010 SCT050=We assume that the weather situation is steady state. Looking at the Conditional Climo Ceiling chart – there’s less than a 20% chance of VFR. Knowing that the flow stays on-shore, we forecast persistence until the Conditional Climo tells us that something will change – in this cast at 23Z LIFR becomes an increasingly more likely category.Actual TAF issued is listed here for comparison.
64 KJFK 311751Z 15007KT 10SM BKN007 19/16 A3020 RMK AO2 SLP225 T01890161 10194 20172 56004= KJFK Z 15007KT 10SM VCFG BKN007 19/16 A3019 RMK AO2 SLP222 VIS S 2 1/2 T =KJFK Z 15009KT 8SM BKN007 19/16 A3017 RMK AO2 SLP217 T =KJFK Z 16011KT 8SM OVC007 18/16 A3016 RMK AO2 SLP213 T =KJFK Z 15011KT 1/2SM BR OVC005 18/16 A3013 RMK AO2 SFC VIS 6 SLP203 T =KJFK Z 15011KT 1/8SM BR OVC003 18/16 A3013 RMK AO2 SFC VIS 6=KJFK Z 15011KT 1/2SM BR OVC003 17/16 A3013 RMK AO2 SFC VIS 6 SFC VIS E-SE 2 1/2 $=KJFK Z 15007KT 1/2SM R04R/3500VP6000FT BR OVC003 17/16 A3014 RMK AO2 SFC VIS 1 1/2 SLP204 T =KJFK Z 15009KT 1/2SM R04R/2000V3500FT BR OVC003 17/16 A3014 RMK AO2 SFC VIS 3/4 SLP204 T =KJFK Z 15006KT 1/2SM R04R/2200V3500FT BR OVC003 17/16 A3013 RMK AO2 SFC VIS 3/4 SLP203 T =KJFK Z 19009KT 1/4SM R04R/2000V2800FT FG VV002 17/16 A3014 RMK AO2 SFC VIS 1/2 SLP205 T $=KJFK Z 18005KT 1/4SM R04R/1800V2200FT FG VV002 17/16 A3014 RMK AO2 SFC VIS 1/2 $=KJFK Z 19006KT 1/8SM R04R/2000V2200FT FG VV002 17/16 A3013 RMK AO2 SFC VIS 1/4 $=KJFK Z 18007KT 1/8SM R04R/2200V2600FT FG VV002 17/16 A3013 RMK AO2 SFC VIS 1/2 SLP203 T $=KJFK Z 17007KT 0SM R04R/1600V1800FT FG VV001 17/16 A3013 RMK AO2 SFC VIS 1/4 $=KJFK Z 18007KT 0SM R04R/1400V1600FT FG VV001 17/17 A3013 RMK AO2 SFC VIS 1/4 SLP201 T $=KJFK Z 17005KT 0SM R04R/1600V2000FT -DZ FG VV001 17/17 A3013 RMK AO2 SFC VIS 1/8 DZB35 SLP203 P0000 T $=KJFK Z 14006KT 0SM R04R/1600FT FG VV001 17/17 A3012 RMK AO2 SFC VIS 1/4 DZE50 SLP199 P T $=KJFK Z 15005KT 0SM R04R/1200V1400FT FG VV001 17/17 A3010 RMK AO2 SFC VIS 1/8 SLP193 T $=KJFK Z 18005KT 0SM R04R/1400FT FG VV001 17/17 A3008 RMK AO2 SFC VIS 1/8 SLP187 T $=KJFK Z 18007KT 0SM R04R/2200V2600FT FG VV001 17/17 A3007 RMK AO2 SFC VIS 1/2 SLP182 T $=KJFK Z 17007KT 0SM R04R/1600V2000FT FG VV001 17/17 A3007 RMK AO2 SFC VIS 1/4 $=KJFK Z 18007KT 0SM R04R/2000V3500FT FG VV001 17/17 A3007 RMK AO2 SFC VIS 1/4 $=KJFK Z 20007KT 0SM R04R/2200V2600FT FG VV002 17/17 A3007 RMK AO2 SFC VIS 1/2 SLP182 T $=KJFK Z 20006KT 0SM R04R/1800V2000FT FG VV002 17/17 A3007 RMK AO2 SFC VIS 1/4 $=KJFK Z 21006KT 0SM R04R/1800V2000FT FG VV001 18/17 A3007 RMK AO2 SFC VIS 1/4 $=KJFK Z 21004KT 0SM R04R/1400FT FG VV001 18/17 A3007 RMK AO2 SFC VIS 1/4 SLP183 T $=KJFK Z 22006KT 0SM R04R/1000FT FG VV001 18/18 A3006 RMK AO2 SFC VIS 1/8 SLP180 T $=KJFK Z 20005KT 0SM R04R/1000V2000FT FG VV001 19/18 A3006 RMK AO2 SFC VIS 1/4 SLP179 T =KJFK Z 19006KT 0SM R04R/1400V2400FT FG VV001 19/18 A3006 RMK AO2 SFC VIS 1/4=KJFK Z 21007KT 0SM R04R/2000V5500FT BR OVC002 19/18 A3005 RMK AO2 SFC VIS 3/4=KJFK Z 19007KT 0SM R04R/1600V4500FT BR OVC002 19/18 A3004 RMK AO2 SFC VIS 1 1/4 SLP173 T =KJFK Z 18007KT 0SM R04R/2200VP6000FT BR BKN003 21/19 A3003 RMK AO2 SFC VIS 1 SLP170 SFC VIS SE-SW 1/2 CIG 002V004 T =KJFK Z 17006KT 3SM HZ BKN003 22/19 A3003 RMK AO2 SFC VIS 4 SFC VIS SW-W 1 1/2 BKN V SCT= KJFK Z 19006KT 5SM HZ SCT003 22/18 A3002 RMK AO2 SLP166 SCT V BKN T = KJFK Z 17009KT 8SM FEW008 24/19 A3000 RMK AO2 SLP158 T = KJFK Z 18009KT 10SM FEW045 SCT250 24/19 A2998 RMK AO2 SLP151 CB DSNT N T = KJFK Z 17010KT 10SM FEW045 SCT250 25/19 A2996 RMK AO2 SLP145 CB DSNT NE TCU DSNT N T = KJFK Z 18015KT 10SM SCT250 25/19 A2994 RMK AO2 SLP137 T = KJFK Z 18020G24KT 10SM FEW045 SCT250 24/19 A2990 RMK AO2 SLP124 TCU DSNT W T =It stayed IFR for the ceiling until 2155Z, an hour earlier than conditional climatology indicated. *the forecaster did not forecast LIFR until 06Z.Note that KJFK has a 400 ft tall tower and that augmented observations get affect by tower visibility.
65 Best times to use Conditional Climatology During “steady state” quiet weather situations.Fog/Stratus eventsRadiation FogAdvection FogMarine StratusPrevailing WindDetermining Onset and Dissipation Times.Seasonal Refresher and New Forecasters orientation.New TAF sites, where 30-years of data exists[ NOTE to presenter: good time to try and dispel the myth that CC is only useful in Radiation fog conditions, Point to the Salt Lake case study in the Camtasia training as an example of how to use in a changing weather environment.]
66 What You Need to DoDevelop local Case Studies with your Airports and TAFs to learn how best to integrate the NEW tools into your TAF’s and your forecast operations.
67 SummaryConditional Climatology improves the TAF process through increased forecaster confidence.Must correctly integrate Conditional Climatology with Observations, NWP, MOS and other techniques.Conditional Climatology can improve TAF quality and service.
68 AVNFPS 3.2 Web Pages Main Page: Supplemental Instructions:Here is a link to the AVNFPS 3.2 web page and a link to the supplemental instructions on this page.I would encourage you all to take a look through this web page.It have a great deal of supplemental material, tips and tricks.