Alert archive / Tennessee / Special Weather Statements in 2017
Special Weather Statement, NWS Memphis, TN
NWS Memphis, TN issued this special weather statement at Jul 23, 2017, 4:54 PM CDT for Shelby County, Tennessee. It was in force for 21 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 23, 2017, 4:54 PM CDT (21:54 UTC)
- Expired
- Jul 23, 2017, 5:15 PM CDT
- In force
- 21 min
- Issued by
- NWS Memphis, TN
County Shelby County, TN
The radar
The Memphis radar (KNQA), 20 km from the middle of the area, began a volume at 21:56 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
Little Rock, AR (KBYH), launched 12:00Z, 9.9 hours before the alert went out and 43 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
- 1403 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1121 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- 5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Memphis, TN wrote its last area forecast discussion before this special weather statement went out at Jul 23, 3:34 PM CDT, 1 hour 20 minutes earlier.
Area forecast discussion, Jul 23, 3:34 PM CDT, 1 hour 20 minutes before
Area Forecast Discussion
National Weather Service Memphis TN
334 PM CDT Sun Jul 23 2017
.DISCUSSION...Dangerous heat has returned across the Mid-South
this afternoon as low level moisture pooling (dewpoints in the
middle 70s to around 80 degrees) ahead of a weak surface front
combined with a very hot airmass in place with temperatures in the
middle to upper 90s has resulted in heat index values between 105
to 109 degrees across much of the area and an area of 110 to 116
degrees across portions of East/Northeast Arkansas, the Missouri
Bootheel, and Southwest Tennessee including areas comprising the
Memphis Metro Area.
Isolated to scattered showers and thunderstorms have developed
across the Lower Mississippi Valley as convective temperatures
have been reached in a very hot and humid airmass. Surface based
CAPE values are in excess of 4000 J/kg but overall shear remains
relatively weak resulting in pulse type thunderstorms occurring
across the forecast area. This convective activity will bring some
relief in the form of cooler temperatures and lower heat index
values where precipitation occurs. Will continue the heat
headlines through 8 PM CDT this evening unless convective trends
suggest otherwise. Moderately steep 700-500 mb layer mid level
lapse rates will support a potential for a few severe
thunderstorms with damaging winds as the primary severe weather
threat along with a secondary threat of localized heavy rainfall.
Additional showers and thunderstorms will be possible later
tonight into Monday as the surface boundary sinks into the region.
A few of the thunderstorms on Monday will have the potential to
become severe with damaging winds and localized heavy rainfall
possible with the stronger storms.
Long term models indicate shower and thunderstorm chances will
persist through at least late this week. There is some potential
for heat index values to approach 105 degrees (advisory criteria)
for mid to late week, especially along and west of the Mississippi
River as the upper level ridge attempts to build back in across
portions of the Lower Mississippi Valley. Later shifts will
continue to monitor the heat and convective trends in subsequent
forecasts. Temperatures this upcoming week are expected to remain
slightly cooler than this weekend with improvement anticipated
towards next weekend.
CJC
&&
.AVIATION...
/18z TAFs/
A moist and unstable air mass will support isolated to scattered
showers and thunderstorms across the Mid-South this afternoon.
Coverage will be somewhat spotty during the daytime hours, but may
increase this evening. There are indications that complex of
storms will develop over the Ohio Valley along a weak cold front
and move south after 00z. Confidence is low on the southern extent
of this convection but the general consensus is that it will be
dissipating by the time it reaches MEM/TUP. Brief reductions in
ceiling and visibility are possible with any thunderstorms during
this time and we could see some brief low ceilings toward morning,
primarily in the vicinity of MKL. Additional showers and
thunderstorms are expected Monday, especially in the afternoon.
Johnson
&&
.MEG WATCHES/WARNINGS/ADVISORIES...
AR...Heat Advisory until 8 PM CDT this evening for Lawrence-Lee AR-
Phillips-Randolph.
Excessive Heat Warning until 8 PM CDT this evening for Clay-
Craighead-Crittenden-Cross-Greene-Mississippi-Poinsett-St.
Francis.
MO...Excessive Heat Warning until 8 PM CDT this evening for Dunklin-
Pemiscot.
MS...Heat Advisory until 8 PM CDT this evening for Alcorn-Benton MS-
Calhoun-Chickasaw-Coahoma-Itawamba-Lafayette-Lee MS-
Marshall-Monroe-Panola-Pontotoc-Prentiss-Quitman-
Tallahatchie-Tate-Tippah-Tishomingo-Tunica-Union-Yalobusha.
Excessive Heat Warning until 8 PM CDT this evening for DeSoto.
TN...Heat Advisory until 8 PM CDT this evening for Benton TN-Carroll-
Chester-Crockett-Decatur-Gibson-Hardeman-Hardin-Haywood-
Henderson-Henry-Lake-Madison-McNairy-Obion-Weakley.
Excessive Heat Warning until 8 PM CDT this evening for Dyer-
Fayette-Lauderdale-Shelby-Tipton.
&&Hazardous weather outlook, Jul 23, 3:39 PM CDT, 1 hour 15 minutes before
Hazardous Weather Outlook National Weather Service Memphis TN 339 PM CDT Sun Jul 23 2017 ARZ008-009-017-018-026>028-035-036-048-049-058-MOZ113-115- MSZ001>017-020>024-TNZ001>004-019>022-048>055-088>092-242245- Alcorn-Benton MS-Benton TN-Calhoun-Carroll-Chester-Chickasaw-Clay- Coahoma-Craighead-Crittenden-Crockett-Cross-DeSoto-Decatur- Dunklin-Dyer-Fayette-Gibson-Greene-Hardeman-Hardin-Haywood- Henderson-Henry-Itawamba-Lafayette-Lake-Lauderdale-Lawrence- Lee AR-Lee MS-Madison-Marshall-McNairy-Mississippi-Monroe-Obion- Panola-Pemiscot-Phillips-Poinsett-Pontotoc-Prentiss-Quitman- Randolph-Shelby-St. Francis-Tallahatchie-Tate-Tippah-Tipton- Tishomingo-Tunica-Union-Weakley-Yalobusha- 339 PM CDT Sun Jul 23 2017 This hazardous weather outlook is for portions of East Arkansas... the Missouri Bootheel...North Mississippi...and West Tennessee. .DAY ONE...This Afternoon and Tonight Dangerous heat index values between 105 to 114 degrees are expected through early this evening. An Excessive Heat Warning and and Heat Advisory is in effect through early this evening. There is a marginal risk for severe thunderstorms across much of the Mid-South into tonight. Damaging winds will be the primary severe weather threat with a secondary threat for heavy rainfall. .DAYS TWO THROUGH SEVEN...Monday through Saturday There is a marginal risk for severe thunderstorms across much of the Mid South on Monday. Damaging winds will be the primary severe weather threat with a secondary threat for heavy rainfall. Heat indices at or above 105 degrees again by midweek. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated at this time.
In the hours before
Special weather statement, Jul 23, 3:27 PM CDT, 1 hour 27 minutes before
Special Weather Statement National Weather Service Memphis TN 327 PM CDT SUN JUL 23 2017 ARZ028-TNZ048-232100- Mississippi AR-Lauderdale TN- 327 PM CDT SUN JUL 23 2017 ...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED UNTIL 400 PM CDT FOR... Northeastern Mississippi County in eastern Arkansas... North central Lauderdale County in western Tennessee... At 326 PM CDT...a strong thunderstorm producing winds at least 40 mph was located near Blytheville. This storm was nearly stationary. Very heavy rain and continuous cloud to ground lightning are also possible with this thunderstorm. People in northeastern Mississippi and north central Lauderdale Counties should monitor this storm closely. LAT...LON 3600 8974 3581 8962 3576 8997 3600 9003 TIME...MOT...LOC 2026Z 331DEG 3KT 3590 8988 JOHNSON
Special weather statement, Jul 23, 4:35 PM CDT, 19 minutes before
Special Weather Statement National Weather Service Memphis TN 435 PM CDT SUN JUL 23 2017 ARZ028-TNZ048-232200- Mississippi AR-Lauderdale TN- 435 PM CDT SUN JUL 23 2017 ...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED UNTIL 500 PM CDT FOR... Central Mississippi County in eastern Arkansas... West central Lauderdale County in western Tennessee... At 435 PM CDT...a strong thunderstorm producing pea size hail and winds to 45 mph was located near Osceola, moving southwest at 10 mph. Very heavy rain is also possible with this thunderstorm. People in central Mississippi and west central Lauderdale Counties should monitor this storm closely. LAT...LON 3588 8998 3578 8983 3559 8991 3569 9024 TIME...MOT...LOC 2135Z 026DEG 10KT 3575 9000
Special weather statement, Jul 23, 4:38 PM CDT, 16 minutes before
Special Weather Statement
National Weather Service Memphis TN
438 PM CDT SUN JUL 23 2017
TNZ050-051-232215-
Crockett TN-Haywood TN-
438 PM CDT SUN JUL 23 2017
...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED UNTIL 515 PM CDT
FOR...
Southwestern Crockett County in western Tennessee...
Northern Haywood County in western Tennessee...
At 437 PM CDT...a strong thunderstorm producing dime to nickel size
hail and winds to 55 mph was located near Belle Eagle, or 11 miles
north of Brownsville. This storm was nearly stationary.
People in southwestern Crockett and northern Haywood Counties should
monitor this storm closely.
LAT...LON 3582 8915 3566 8915 3569 8945 3582 8938
3582 8936 3584 8936 3585 8935
TIME...MOT...LOC 2137Z 036DEG 1KT 3577 8927Special weather statement, Jul 23, 4:54 PM CDT, 0 minutes before
Special Weather Statement National Weather Service Memphis TN 454 PM CDT SUN JUL 23 2017 TNZ088-232215- Shelby TN- 454 PM CDT SUN JUL 23 2017 ...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED UNTIL 515 PM CDT FOR... Eastern Shelby County in western Tennessee... At 453 PM CDT...a strong thunderstorm producing winds up to 45 mph was located near Bartlett. This storm was nearly stationary. Very heavy rain will occur with this thunderstorm. People in eastern Shelby County should monitor this storm closely. LAT...LON 3513 8964 3506 8993 3525 9004 3536 8965 TIME...MOT...LOC 2153Z 123DEG 1KT 3518 8990
The office that day
Everything else NWS Memphis, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 1:34 PM CDT | Excessive Heat Warning | MEG | Dyer, Fayette, Lauderdale, Shelby, Tipton | 6 hr |
| Jul 23, 3:27 PM CDT | Special Weather Statement | MEG | Lauderdale | 33 min |
| Jul 23, 3:54 PM CDT | Severe Thunderstorm Warning | MEG | Lauderdale | 36 min |
| Jul 23, 4:38 PM CDT | Special Weather Statement | MEG | Crockett | 37 min |
| Jul 23, 5:03 PM CDT | Areal Flood Advisory | MEG | Shelby | 57 min |
| Jul 23, 5:10 PM CDT | Special Weather Statement | MEG | Madison | 35 min |
| Jul 23, 5:18 PM CDT | Special Weather Statement | MEG | Shelby | 27 min |
| Jul 23, 5:28 PM CDT | Special Weather Statement | MEG | Henderson | 32 min |
| Jul 23, 5:32 PM CDT | Severe Thunderstorm Warning | MEG | Henderson, Madison | 43 min |
| Jul 23, 5:35 PM CDT | Severe Thunderstorm Warning | MEG | Fayette, Shelby, Tipton | 40 min |
| Jul 23, 5:39 PM CDT | Severe Thunderstorm Warning | MEG | Carroll, Decatur, Henderson | 51 min |
| Jul 23, 5:57 PM CDT | Areal Flood Advisory | MEG | Carroll, Henderson | 2 hr |
| Jul 23, 6:10 PM CDT | Special Weather Statement | MEG | Chester | 35 min |
| Jul 23, 6:21 PM CDT | Severe Thunderstorm Warning | MEG | Hardeman, Haywood, Madison | 39 min |
| Jul 23, 6:40 PM CDT | Special Weather Statement | MEG | Madison | 35 min |
| Jul 23, 4:35 PM CDT | Special Weather Statement | MEG | Mississippi | 25 min |
| Jul 23, 6:06 PM CDT | Special Weather Statement | MEG | Mississippi | 24 min |
| Jul 23, 6:12 PM CDT | Special Weather Statement | MEG | Dunklin | 33 min |
Nearby
Special Weather Statements in Tennessee, 2017Every special weather statement in 2017
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.