BBS:      TELESC.NET.BR
Assunto:  MESO: Nws Weather Prediction Center College Park Md
De:       COD Weather Processor
Data:     Wed, 27 May 2026 13:22:19 +0000
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AWUS01 KWNH 271322
FFGMPD
DEZ000-MDZ000-VAZ000-DCZ000-271519-

Mesoscale Precipitation Discussion 0258
NWS Weather Prediction Center College Park MD
920 AM EDT Wed May 27 2026

Areas affected...Maryland, District of Columbia

Concerning...Heavy rainfall...Flash flooding possible

Valid 271319Z - 271519Z

Summary...Isolated flash flood potential will exist as a cluster
of storms over western Maryland moves through the region this
morning.

Discussion...A persistent cluster of thunderstorms was noted via
radar mosaic imagery near Frederick.  These cells have shown
modest signs of intensification in the last few minutes.  They are
being supported by weak mid-level waves moving through zonal flow
over northern VA and near 70F dewpoints that were fostering 1.75-2
inch PW values and ~1000 J/kg MUCAPE.  Despite current rain rates
of 0.5-0.75 inch/hr, moisture values increase with downstream
extent toward the Chesapeake Bay.  Though appreciable steering
flow was supporting fairly quick movement of individual cells
(around 35-40 knots), increasing downstream moisture profiles and
urban ground surfaces/lower FFGs nearer to I-95 (0.75 in/hr) may
support isolated instances of flash flooding this morning.  This
potential should be brief (perhaps extending through 15Z/11a).=20
More upstream convection is possible later today and will be
monitored for any flash flood potential beyond 15Z.

Cook

...Please see https://urldefense.com/v3/__http://www.wpc.ncep.noaa.gov__;!!=
DZ3fjg!5igO96g-vGZ-IIMMg39nVl5zsxBvbZHOry29pAv0nGBaIt3RunBWy5jNiTncz1mP9jIb=
49E2ugkjZCi8kpY0Hxv1RQo$  for graphic product...

ATTN...WFO...LWX...PHI...

ATTN...RFC...RHA...NWC...

LAT...LON   39727661 39527578 38907572 38667657 39187757=20
            39657737=20

=3D =3D =3D
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