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333:(LI) of -6. The low level wind profile indicated little directional shear, but significant speed shear as present. The 1200 UTC PAH sounding indicated a mean wind of 250o at 25 kt. This is more than favorable for a squall line to produce significant damaging winds over a long period of time and a large area which is what a derecho is.
231:
In addition, widespread crop damage was reported in portions of
Virginia and North Carolina due to very large hail and damaging winds. There were also several spin-up tornadoes confirmed in North Carolina. In Virginia, there were several reports of tornado sightings, but none were actually confirmed.
227:
Moderate to significant damage was observed along the path. The hardest hit area was in
Lynchburg Virginia, where winds of 80 mph were recorded. Significant damages to homes were reported, with roofs being peeled and church steeples being toppled. In addition, numerous trees toppled caused 95%
423:
Portions of southern
Virginia and northern North Carolina suffered the most severe known damage from this derecho. The strong winds blew across the Appalachian mountains, and into farmland. This caused significant crop damage in these farmland areas, as well as toppling numerous trees in forests.
427:
The derecho continued pushing eastward, and it eventually reached the
Lynchburg, Virginia area, where the worst damage overall is reported. In Lynchburg, gusts of nearly 80 mph knocked over two church steeples, peeled back roofs and brick walls, damaged thousands of cars and toppled so many
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Gravity waves weaken considerably when capping is eliminated. Without trapping, the amplitudes of most gravity waves decrease rapidly. Accordingly, this derecho weakened considerably as it entered Ohio and West
Virginia during the late afternoon after the capping had been eradicated by afternoon
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will cause the air to sink to its original position. Repetitive upward and downward motion beneath the inversion often induces gravity waves. Areas of high and low pressure, or components of a gravity wave (i.e., crests and troughs), often propagate with and maintain convection above the capped
341:
During the morning and early afternoon of 4 June 1993, a storm complex moved across southern
Missouri, southern Illinois, western and central Kentucky, and northern middle Tennessee. An associated high precipitation (HP) supercell evolved into a derecho . The derecho moved slightly south of and
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at 1700 UTC and continued into eastern
Kentucky, reaching Somerset at 1810 UTC. The derecho exited Kentucky by 2000 UTC and continued eastward through Ohio and West Virginia. By 0000 UTC, 5 June, the derecho had moved to northeast North Carolina, producing windespread wind damage.
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was on the south end of this system, and was moving to the south. By the 00z analysis, the squall line was in
Virginia and North Carolina, with the outflow boundary extending from The North Carolina/Tennessee border to the islands of North Carolina and the far western
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Throughout the day, the main low pressure system continued moving slowly to the northeast. The stationary boundary which was due east at 12z became tilted a bit to the southeast while very slowly moving northward. The associated outflow boundary with the now mature
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damage. However, with widespread very large hail being present along the entire path of this derecho, there was significant hail damage being reported to vehicles, windows, and especially crops. The total damage cost exceeded 70 million dollars
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trees that power was cut to 95 percent of the city. At least 23 people were hurt by the falling trees, but no deaths were reported in the state. The damage in
Lynchburg alone was estimated at $ 21 million at the time.
349:. Initial storm movement was from the west at 45 kt, although the bow echo complex quickly accelerated as it moved across southeast Missouri (50 kt) and western Kentucky, reaching PAH at 1525 UTC. The derecho reached
532:
116:
Significant damage to structures was reported, including peeled roofs and toppled church steeples. Numerous trees were damaged, causing widespread power outages. Crops were impacted by winds and hail.
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aloft. (The 1200 UTC PAH sounding indicated a strong inversion between the surface and 925 mb.) Gravity waves thrive near boundaries. Convergence near boundaries forces air to rise with
564:
353:
at 1615 UTC, speed having increased to 70 kt. The derecho continued across central
Kentucky and northern middle Tennessee, maintaining an average speed of 60 kt. The storm reached
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parallel to a surface boundary along the Ohio River valley. This serial derecho produced widespread wind damage (and F0/F1 tornadoes) exceeding $ 70 million and injured 79.
623:
326:
216:. In addition, several severe wind reports were received scattered across this swath. In addition, there were a few weak
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swept across the Midwestern and Eastern United States. The most significant damage was reported in portions of southern
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along the cold front and southwest of the main low pressure. To the east of the low pressure, a
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The Governor of Virginia declared a state of emergency for this area due to the severe damage.
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533:"25 years ago: The windstorm that blasted Virginia when 'derecho' was still an obscure word"
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There was significant damage reported along the path. The primary damage type was mostly
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On the morning of June 4th, a storm complex was moving across the mid-west. At the 12z
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373:, as suggested by the 60 kt movement of the derecho. The gravity wave developed in an
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that were confirmed along the path. In addition, widespread large and damaging
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axis extended north to south across the southern plains states. The 1200 UTC
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The first report of wind damage was at 1345 UTC about 20 miles northwest of
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https://www.weather.gov/media/wrh/online_publications/talite/talite1406.pdf
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was analysed near the border of western Missouri and Arkansas. A large
551:"WPC North American surface analysis zoom, pan, animation and archives"
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204:. This derecho caused widespread wind damage reports in a swath from
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507:"SPC Historical Severe Weather Database Browser (SeverePlot 3.0)"
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extended from this low and persisted due eastward across the
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531:Times-Dispatch, JOHN BOYER Richmond (4 June 2018).
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260:extended from the surface low southwestward into
58:100 mph (161 km/h; 44.7 m/s) (
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309:. The derecho was winding down by this point.
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461:"An Analysis of Five Springtime Derechos"
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365:Although the derecho evolved from a HP
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484:"SeverePlot 3.0: Report data listing"
327:Convective Available Potential Energy
30:Wind and tornado reports for derecho.
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459:US Department of Commerce, NOAA.
228:of the city to be without power.
182:Most severe tornado damage; see
70:3.50 in (8.9 cm) (
369:, it was likely sustained by a
292:that would be the foundational
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624:Derechos in the United States
329:(CAPE) of 1,838 J kg-1 and a
224:was observed along the path.
325:(KPAH) sounding indicated a
419:Virginia and North Carolina
317:At 1200 UTC, a weak 500 mb
288:was associated with the HP
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192:On June 4, 1993, a severe
72:Mocksville, North Carolina
415:) across the whole path.
247:Weather Prediction Center
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125:Midwestern United States
537:Richmond Times-Dispatch
381:near the surface, with
236:Meteorological synopsis
88:Strongest tornado
296:for the main derecho.
208:eastward into much of
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313:Environmental factors
128:Eastern United States
112:Types of damage
26:
134:Provincial Breakdown
53:Peak wind gust
17:June 4, 1993 Derecho
565:"Derechos FAQ page"
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389:, and the lack of
212:into Virginia and
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598:Missing or empty
355:Bowling Green, KY
278:Ohio River Valley
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60:Elizabethtown, KY
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351:Hopkinsville, KY
347:Poplar Bluff, MO
282:outflow boundary
274:stationary front
250:surface analysis
241:Surface features
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62:, United States)
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79:Tornado count
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600:|title=
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371:gravity wave
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359:Gallatin, TN
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331:lifted index
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294:thunderstorm
286:triple point
254:low pressure
252:, a surface
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184:Fujita scale
106:$ 70 million
100:Damage costs
67:Largest hail
39:June 4, 1993
383:instability
377:exhibiting
323:Paducah, KY
302:squall line
435:References
375:atmosphere
266:New Mexico
258:cold front
55:(measured)
398:heating.
379:stability
367:supercell
319:shortwave
290:supercell
284:near the
218:tornadoes
202:Lynchburg
618:Category
591:cite web
391:buoyancy
270:Oklahoma
210:Kentucky
206:Missouri
198:Virginia
167:Virginia
152:Kentucky
146:Illinois
140:Missouri
44:Duration
394:layer.
387:capping
194:derecho
157:Indiana
95:tornado
47:7 hours
36:Date(s)
402:Damage
280:. An
264:into
262:Texas
604:help
408:wind
222:hail
142:(SE)
104:est.
413:USD
148:(S)
620::
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589:{{
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93:F1
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