Alert archive / Maine / Mesoscale Discussions in 2024
Mesoscale Discussion 913
The Storm Prediction Center issued this mesoscale discussion at May 23, 2024, 3:29 PM EDT for 8 counties in Maine. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- May 23, 2024, 3:29 PM EDT (19:29 UTC)
- Expired
- May 23, 2024, 5:00 PM EDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 292
Counties Androscoggin County, ME, Hancock County, ME, Kennebec County, ME, Knox County, ME, Lincoln County, ME, Penobscot County, ME, Sagadahoc County, ME, Waldo County, ME
The radar
The Caribou radar (KCBW), 133 km from the middle of the area, began a volume at 19:29 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Gray, ME (KGYX), launched 12:00Z, 7.5 hours before the alert went out and 174 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 434 J/kg
- Mixed-layer CIN
- -131 J/kg
- Mixed-layer LCL
- 1469 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
701
ACUS11 KWNS 231929
SWOMCD
SPC MCD 231929
MEZ000-232100-
Mesoscale Discussion 0913
NWS Storm Prediction Center Norman OK
0229 PM CDT Thu May 23 2024
Areas affected...Parts of southern/eastern ME
Concerning...Severe Thunderstorm Watch 292...
Valid 231929Z - 232100Z
The severe weather threat for Severe Thunderstorm Watch 292
continues.
SUMMARY...Some threat for hail and damaging wind will spread
eastward through the afternoon.
DISCUSSION...A line of strong to potentially severe thunderstorms is
ongoing from southern into northeast Maine this afternoon. The
immediate downstream environment remains somewhat favorable for
organized convection, with MLCAPE approaching 1000 J/kg and modestly
favorable deep-layer shear (as noted on the 17Z/18Z CAR/GYX modified
soundings and regional VWPs), and some threat for hail and damaging
wind will continue into late afternoon.
With cooler onshore flow noted over the Downeast Maine vicinity,
some weakening will be possible with time as storms move into this
region. However, sufficient elevated buoyancy may still support some
threat for isolated marginal hail and/or a strong/damaging gust
before storms move offshore. Isolated storm redevelopment also
remains possible into southern ME behind the outflow, though at this
time any severe threat with this redevelopment is currently expected
to remain marginal and isolated.
..Dean.. 05/23/2024
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...CAR...GYX...
LAT...LON 44466996 45846876 47016855 47236857 47266808 46866769
45846764 44756782 44256824 43856895 43756954 43796993
43927026 44177063 44466996SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 12:03 PM EDT | Mesoscale Discussion | SPC | Androscoggin, Franklin, Kennebec, Oxford, Penobscot, Piscataquis and 1 more | 117 min |
| May 23, 12:48 PM EDT | Severe Thunderstorm Watch | SPC | Androscoggin, Aroostook, Franklin, Hancock, Kennebec, Knox and 8 more | 4 hr |
Nearby
Mesoscale Discussions in Maine, 2024Every mesoscale discussion in 2024
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.