Met Brief, 20130819 Lenny Pfister Nick Heath. Weather today/yesterday.

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Presentation transcript:

Met Brief, Lenny Pfister Nick Heath

Weather today/yesterday

Trough in northern great plains generated string of MCSs across southern CA 500mb ridge in west is typical, but northern position of closed circulation is not.

Dry trough keeps Gulf moisture away for today. Core of precipitable water is in eastern Gulf.

Forecast for this PM holding as clearing occurs behind the upper level trough that generated MCS in the north yesterday and this morning.

Today, expect precip to be concentrated in eastern portion of SEUS. Note very weak flow, high is offshore (925 mb winds also light and variable).

Precip over past few days. Ground is moist, any heating will at least generate puffy clouds. Chemistry impact?

Weather Wednesday

By Wednesday, 500mb trough has lifted somewhat, a low (upper level and surface) has developed near Hudson’s bay, and a front is extending from the upper old northwest through SD/Iowa. Closed anticyclonic circulation has weakened with lifting trough, but No MCSs expected except along the frontal boundary. Closed low off Pacific coast starting to move in. Expect T-storms in CA about this time.

Similar basic rain pattern for NCAR WRF (above), GFS (below right), and EC (above right). Bottom line – precip and convection further west (slightly) in SEUS. Do not expect rain over AR. EC underdoes, WRF overdoes the precip.

Detail on precip pattern and flow in SEUS Precip shifted westward relative to today. Weak flow at the surface. This model shows development in NE TN, probably related to dynamics of retreating trough.

Ample CAPE (Convective available potential energy) over SEUS, also the Gulf. Forcing may be stronger in the north (associated with retracting trough), so big systems north of Huntsville are possible. Coastal convection before noon is expected on Wednesday.

Convectively active Gulf on Wednesday. Substantial CAPE. No obvious strong waves present, so expect diurnal pattern, maximizing before noon. There should be convective outflow to sample.

Outflow from recent convection in the Gulf over SEUS region.

Ample high clouds along trailing trough/front associated with HB low. High clouds associated with active convection in Gulf and SEUS. Expect AR to be clear.

Wednesday max temp

Anticyclone well developed and displaced eastward on Sunday. Have had substantial convection over Rockies (and yesterday over Mexico as well).

Slightly westward movement of PW over SEUS. Clear westward propagation of Gulf moisture. The dry air (that has been shutting down the rain here in last few days) retreats with the lifting trough. Expect diurnal type showers on Wednesday. (Peak T-storms probably 2-3 PM based on climo).

Friday

Long term 500mb forecast. Similar pattern in both GFS and EC. Ridge moves eastward – ridge east of climo position. GFS slower in moving CA closed low eastward, but EC has new trough coming into West Coast. Both models develop a TC, related to a current disturbance (20%) near (107,13)

Both models generate a strong low-high pattern over the northern tier. Major effect on SEUS is convection ahead of the front in northern TN. Cannot count on that detail being correct (!) Flow south of that very weak. AR region likely in the clear.

Incoming trough reduces monsoonal moisture in western part of Great Basin, rockies. Still expect ample convection in eastern Rockies. PW is moving into TX. Expect 30% chance of diurnal T-storms, peak around 2-3 PM (though not a sharp peak)

Friday Max Temps

Good pattern for NAM on Friday. Accessible, pronounced closed circulation. There has been active convection in the Rockies over the week, so this is a real possibility

And Beyond

Summary T/O weather to be similar to climo, with 20-30% chance of showers, peaking 2-3 PM both Wednesday and Friday Precip pattern moving further west in SEUS on Wednesday than today, though expect AR/MO to still be free of precip and clear. Low puffy clouds are expected. Upper trough weakens on Wednesday, though still expect southward flow advection into northern part of SEUS Friday trough retracts further and moves east. Expect rain in SEUS in northern TN and near coast (mostly). Advection from northern smoke largely shut off NAM conditions are good for both Wednesday and Friday. Expect ridge to persist and move eastward and persist early next week.

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