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.
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.
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
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.
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.
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.
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
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.