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WFO Applications of TAMDAR. Many WFOs have begun to use TAMDAR in their public, aviation and marine forecasts. Many other applications are yet to be realized, such as fire weather, HAZMAT support, and convective warnings. FSL Web Access.

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Wfo applications of tamdar
WFO Applications of TAMDAR

  • Many WFOs have begun to use TAMDAR in their public, aviation and marine forecasts.

  • Many other applications are yet to be realized, such as fire weather, HAZMAT support, and convective warnings.


Fsl web access
FSL Web Access

  • Total soundings accessed by NWS Central Region offices are now more than double before the GLFE began.

  • Sounding requests from TAMDAR airports rose from 279 in December 2004 to more than 700 in February and March 2005


Area forecast discussions
Area Forecast Discussions

  • NWS meteorologists have mentioned the use of TAMDAR in their area forecast discussions about fifty times each month.


Tamdar data use
TAMDAR Data Use

  • TAMDAR has been used in forecasting

    • Fog formation

    • Model comparison and verification

    • Lake effect snow

    • Precipitation type – Ice Storm

    • Precipitation type - Snowstorm

    • Use in Local Models


Fog formation
Fog Formation

AREA FORECAST DISCUSSION

NWS GREEN BAY WI

345 AM CST MON MAR 21 2005

.SHORT TERM...TODAY THROUGH TUESDAY. RELATIVELY QUIET

TONIGHT COMPARED TO THE LAST FEW DAYS. NORTHEAST LOW LEVEL

FLOW CONTINUES TO PRODUCE SOME CLOUDINESS OVER THE

NORTHEAST HALF OF THE FORECAST AREA. SOME LAKE EFFECT

SNOW FLURRIES SEEN OVER THE LAKE ON RADAR SHOULD STAY THERE.

DONT THINK FOG WILL DEVELOP BEFORE SUNRISE DUE TO GRADIENT

WIND AND DRY TAMDAR SOUNDINGS FROM LATE EVENING FLIGHTS

INTO CENTRAL WISCONSIN AIRPORT.


Fog formation1
Fog Formation

AREA FORECAST DISCUSSIONNWS NORTHERN INDIANAAFDIWX 645 PM EST SAT MAR 26 2005

.AVIATION... FOG/LOW CLOUDS A CONCERN FOR AVIATION TONIGHT AS

DEWPOINT DEPRESSIONS 5-8DEG WITH LIGHT WINDS AS SUNSET

APPROACHES. HWVR, FAIRLY WIDESPREAD LOW/MID CLOUDS

LINGERING ACROSS THE AREA, AND HIGH CLOUDS SPREADING NE

TOWARD THE MDWST SHOULD LIMIT RADIATIONAL COOLING TONIGHT.

ALSO, TAMDAR SOUNDINGS FROM SBN/FWA THIS EVE SHOWING DWPTS

DECREASING WITH HEIGHT IN LOWEST 50MB AGL


Model comparison verification
Model Comparison & Verification

  • AREA FORECAST DISCUSSIONNWS GRAND RAPIDS MIAFDGRR 308 AM EST THU MAR 17 2005

    THE SHORT RANGE MODELS ARE SIMILAR THIS MORNING AND BASICALLY HAVE THE NORTHWEST US SHORT WAVE INDUCING A SFC LOW IN THE PLAINS TODAY AND THEN THAT LOW MOVES EAST THROUGH THE CWA BY LATE SATURDAY. GFS AND ETA MODEL SOUNDINGS LINE UP VERY NICELY WITH CURRRENT TAMDAR SOUNDINGS OVER THE SOUTHERN GREAT LAKES AND SHOW A REMARKABLY SIMILAR PROFILE.


Lake effect snow
Lake Effect Snow

AREA FORECAST DISCUSSIONNWS MARQUETTE MIAFDMQT 1032 AM EST SUN MAR 13 2005

.DISCUSSION... MAIN UPDATE CONCERN IS LAKE EFFECT.

A POLAR VORTEX WAS LOCATED OVER FAR NW ONTARIO IN THE

TROUGH...WITH A SHRTWV LOCATED NEAR PICKLE LAKE ONTARIO.

HEIGHTS CONTINUE TO RISE OVER UPPER MICHIGAN AHEAD OF THIS

SHRTWV...NOW APPROXIMATELY AT 525 DAM (NEAR 10 DAM INCREASE

SINCE 00Z). THESE RISING HEIGHTS HAVE ALSO YIELDED RISING 850MB

TEMPERATURES WITH READINGS AROUND -15C OVER WESTERN LAKE

SUPERIOR AND -18C OVER THE EASTERN PORTION. LAKE EFFECT

CONTINUES DUE TO THE INSTABILITY...BUT DRY AIR AS SEEN ON A

12Z TAMDAR SOUNDING AT CMX AND THE 12Z GRB SOUNDING HAS

KEPT THE LAKE EFFECT LIGHT.


Precipitation type ice storm
Precipitation type – Ice Storm

Forum posting from Andrew Just at NWS Marquette

Yesterday morning (December 30th) at the Marquette NWS office, we constantly

looked at the latest TAMDAR soundings to get a measure of the amount of both

dry air over the Western Great Lakes Region and how warm the air was aloft. The

reason for this was the concern for a period of freezing rain across Upper Michigan,

and whether some of the precipitation would start off as snow or sleet due to

evaporative cooling. Surface observations told us when the freezing rain would

transition over to rain, however the frequent soundings gave us more of an idea

how long the freezing rain would last. Because the soundings showed potential for

a couple of hours of freezing rain with little in the way of snow or sleet, we upgraded

the winter weather advisories to ice storm warnings. These warnings would

eventually verify during the afternoon, with reports of anywhere from 0.25 to 0.5 inch

of ice along with plenty of accidents on the roads.


Precipitation type snowstorm
Precipitation type - Snowstorm

Comments received from Dan Baumgardt, Science Officer, NWS La Crosse

On December 5, 2004, there was some question on the precipitation type during the

night. The models were indicating that the warm air would advance northward into

the region...but the TAMDAR flights that evening showed that the cold air was

holding.  As a result, the snow changing to all rain forecast was changed to all snow

and accumulations were added to the forecast.  The area ended up seeing all snow

during this event; thus, the TAMDAR data proved to be a very valuable data during

this event.


Use in local model
Use in Local Model

AREA FORECAST DISCUSSION...UPDATENWS CLEVELAND OHIOAFDCLE 940 PM EST WED MAR 2 2005

PREV UPDATE... AM SOMEWHAT CONCERNED ABOUT THE CONTINUED

MOISTURE OVR ONTARIO ROTATING INTO THE AREA. ALTHOUGH THE

FORECAST AREA IS NOW GENERALLY UNDER WEAK NVA WITH THE

VORT NOW TO THE SE OF THE AREA...AM NOT CONFIDENT THAT THE

MOISTURE WILL EXIT/DISSIPATE AS FAST AS THE MDLS SUGGEST. THE

18Z NAM INSISTS ON STRONG LOW LVL CVRG AND UPWARD MOTION

ACROSS NW PA. COMBINED WITH THE LK HURON FETCH AND STRONGLY

CYCLONIC FLOW CONTINUING INTO THE EARLY MORNING THINK THAT

LCLY HVY SNOW WILL CONTINUE THRU MIDNIGHT. DATA FROM TAMDAR

FLIGHT INTO ERI AT 23Z ALSO SHOWS INVERSION STILL ABOVE 6000 FT

SO THERE IS STILL PLENTY OF LOW LVL INSTABILITY. NWS MQT WRF

RUN FROM 18Z USING THE TAMDAR DATA CONTINUES TO SHOW

SIGNIFICANT PCPN FOR NW PA OVERNIGHT.


Sounding comparisons
Sounding Comparisons

  • TAMDAR was compared with NWS radiosondes at 1100 UTC and 2300 UTC Saturday, 4/9/05

  • Comparisons at Minneapolis and International Falls were favorable, with little questionable data seen.


International falls minnesota
International Falls, Minnesota

  • 2300 UTC April 9, 2005

  • Temperature differences at 925, 850, and 700mb were 0.8C, 1.1C, and 0.4C

  • Dewpoint differences were 1.0C, 0.8C, and 0C

  • Wind speed and direction differences were negligable


Minneapolis minnesota
Minneapolis, Minnesota

  • 1100 UTC April 9, 2005

  • Radiosonde compared to two TAMDAR soundings from short duration flights.

  • Average temperature differences at 950, 925, and 850 mb were 0.3C, 0.8C, and 0.2C

  • Average dewpoint differences were 0.7C, 1.1C, and 6.5C (sharp gradient at 850mb)

  • Wind direction differences averaged 10 to 20 degrees, speeds differed by up to 19 knots in strong, turbulent low level jet


Need to address
Need to Address

  • Update Mesaba Flight Schedule

  • Inform WFOs of change to GLFE duration

  • Get TAMDAR used for Severe Weather support by WFOs, CWSUs, AWC, SPC and airline meteorology units – believe this to be extremely important for success


Mesaba schedule
Mesaba Schedule

  • Current Mesaba schedule on GLFE web page is from December 2004

  • Some flight times and routes have been changed

  • This should be updated immediately


Inform wfos of duration of glfe
Inform WFOs of duration of GLFE

  • Will need to inform users to date change of GLFE. This may affect participation (should improve it), local model runs, and survey times

  • Other users such as the media and universities should also be informed


Severe weather applications
Severe Weather Applications

  • TAMDAR should prove to be even more valuable during the convective season

  • Reduction of data due to icing should be greatly reduced

  • Events such as squall lines and mesoscale convective complexes are often poorly handed by models and forecasters due to lack of data. TAMDAR should be of great value


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