Alert archive / Mississippi / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 217, NWS Memphis, TN
NWS Memphis, TN issued this severe thunderstorm warning at Aug 18, 2015, 5:36 PM CDT for Calhoun County, Chickasaw County, Mississippi. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 18, 2015, 5:36 PM CDT (22:36 UTC)
- Expired
- Aug 18, 2015, 6:15 PM CDT
- In force
- 39 min
- Issued by
- NWS Memphis, TN
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Calhoun County, MS, Chickasaw County, MS
The radar
The Columbus AFB radar (KGWX), 75 km from the middle of the area, began a volume at 22:36 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, 10.6 hours before the alert went out and 125 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
- 425 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 1076 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 18, 3:38 PM CDT, 1 hour 58 minutes earlier.
Area forecast discussion, Aug 18, 3:38 PM CDT, 1 hour 58 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MEMPHIS TN 338 PM CDT TUE AUG 18 2015 .DISCUSSION...WATER VAPOR SATELLITE/WSR-88D VAD WIND PROFILES THIS AFTERNOON INDICATE A SUBTLE MID LEVEL SHORTWAVE MOVING THROUGH THE LOWER MISSISSIPPI VALLEY. AS A RESULT...SCATTERED SHOWERS AND THUNDERSTORMS HAVE DEVELOPED ACROSS THE MID SOUTH WITH THE GREATEST COVERAGE ACROSS NORTH MISSISSIPPI. AS OF 3 PM CDT...TEMPERATURES ACROSS THE MID SOUTH ARE IN THE UPPER 80S TO LOWER 90S ACROSS MOST AREAS WHERE RAIN HASN/T OCCURRED JUST YET. A WEAK SUBTLE MID LEVEL SHORTWAVE WILL MOVE ACROSS THE MID SOUTH FOR THE REMAINDER OF THE AFTERNOON INTO THIS EVENING. OVERALL FORCING REMAINS WEAK AND CONVECTION IS BEING PREDOMINANTLY DRIVEN BY DAYTIME HEATING. CONSEQUENTLY...ANTICIPATING OVERALL COVERAGE TO DIMINISH SOMEWHAT TOWARDS SUNSET. SHORT TERM MODEL TRENDS CONTINUE TO INDICATE WEAKENING MID LEVEL HEIGHTS ACROSS THE MID SOUTH AS AN UPPER LEVEL TROUGH MOVES ACROSS THE UPPER AND MIDDLE MISSISSIPPI VALLEYS WEDNESDAY INTO WEDNESDAY NIGHT. AT THE SURFACE...A COLD FRONT OVER THE MIDDLE/UPPER MISSISSIPPI VALLEYS IS EXPECTED TO DROP INTO THE MID SOUTH WEDNESDAY NIGHT INTO THURSDAY. THIS WILL RESULT IN INCREASED CHANCES FOR SHOWERS AND THUNDERSTORMS WEDNESDAY INTO WEDNESDAY NIGHT WITH RAIN CHANCES GRADUALLY SHIFTING MAINLY ALONG AND SOUTH OF I-40 ON THURSDAY. BEST FORCING/KINEMATICS WILL REMAIN TO THE NORTH OF THE REGION WITH ANY CONVECTION BEING DRIVEN PREDOMINANTLY BY THERMODYNAMICS. 0-6 KM SHEAR VALUES AROUND 35 KTS SUPPORT SOME ORGANIZATION AND PERHAPS A POTENTIAL FOR STRONG TO SEVERE THUNDERSTORMS ESPECIALLY WEDNESDAY AFTERNOON INTO WEDNESDAY EVENING. THE AFOREMENTIONED FRONT IS EXPECTED TO PUSH BACK NORTH OF THE AREA FRIDAY INTO SATURDAY WITH SHOWER AND THUNDERSTORM CHANCES INCREASING AGAIN...FOLLOWED BY ANOTHER PASSAGE OF A FRONT LATE FOR THE UPCOMING WEEKEND. CJC && .AVIATION... 18Z TAFS DEEP SOUTHERLY TROPICAL FLOW WILL PREVAIL THROUGH THE NEXT 24 HOURS. BEST SHRA/TSRA CHANCES WILL REMAIN NEAR TUP. WEDNESDAY MORNING WILL LIKELY SEE AN EXPANSION OF SHRA/TSRA CHANCES WITH DAYTIME HEATING AND THE APPROACH OF A MIDLEVEL TROF. PWB && .MEG WATCHES/WARNINGS/ADVISORIES... AR...NONE. MO...NONE. MS...NONE. TN...NONE. &&
Hazardous weather outlook, Aug 18, 3:40 PM CDT, 1 hour 56 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MEMPHIS TN 340 PM CDT TUE AUG 18 2015 ARZ008-009-017-018-026>028-035-036-048-049-058-MOZ113-115- MSZ001>017-020>024-TNZ001>004-019>022-048>055-088>092-191045- 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- 340 PM CDT TUE AUG 18 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST ARKANSAS... THE MISSOURI BOOTHEEL...NORTH MISSISSIPPI...AND WEST TENNESSEE. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS MUCH OF THE MID SOUTH ON WEDNESDAY...ESPECIALLY WEDNESDAY AFTERNOON INTO WEDNESDAY EVENING. DAMAGING WINDS WILL BE THE PRIMARY THREAT FOR ANY THUNDERSTORMS WHICH REACH SEVERE LIMITS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED WEDNESDAY AFTERNOON INTO WEDNESDAY EVENING.
In the hours before
Special weather statement, Aug 18, 4:03 PM CDT, 1 hour 33 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MEMPHIS TN 403 PM CDT TUE AUG 18 2015 MSZ001-002-008-TNZ088-089-182130- TATE MS-MARSHALL MS-DESOTO MS-FAYETTE TN-SHELBY TN- 403 PM CDT TUE AUG 18 2015 ...THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A SIGNIFICANT WEATHER ADVISORY UNTIL UNTIL 430 PM CDT FOR... NORTH CENTRAL TATE COUNTY IN NORTHWESTERN MISSISSIPPI... NORTHWESTERN MARSHALL COUNTY IN NORTHWESTERN MISSISSIPPI... EASTERN DESOTO COUNTY IN NORTHWESTERN MISSISSIPPI... SOUTHERN FAYETTE COUNTY IN WEST TENNESSEE... SOUTHEASTERN SHELBY COUNTY IN WEST TENNESSEE... AT 403 PM CDT...A STRONG THUNDERSTORM PRODUCING PEA SIZE HAIL OR LARGER AND WINDS AT LEAST 40 MPH WAS LOCATED NEAR BYHALIA...OR 10 MILES SOUTHEAST OF OLIVE BRANCH...MOVING NORTHEAST AT 25 MPH. VERY HEAVY RAIN ALONG WITH CONTINUOUS CLOUD TO GROUND LIGHTNING ARE ALSO POSSIBLE WITH THIS THUNDERSTORM. PEOPLE IN NORTH CENTRAL TATE...NORTHWESTERN MARSHALL...EASTERN DESOTO...SOUTHERN FAYETTE AND SOUTHEASTERN SHELBY COUNTIES SHOULD MONITOR THIS STORM CLOSELY. LAT...LON 3477 8963 3474 8995 3513 8989 3508 8927 TIME...MOT...LOC 2103Z 213DEG 24KT 3482 8975
Special weather statement, Aug 18, 4:51 PM CDT, 45 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEMPHIS TN
451 PM CDT TUE AUG 18 2015
MSZ015-022>024-182230-
CALHOUN MS-CHICKASAW MS-PONTOTOC MS-MONROE MS-
451 PM CDT TUE AUG 18 2015
...THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY UNTIL UNTIL 530 PM CDT FOR...
CALHOUN COUNTY IN NORTHEASTERN MISSISSIPPI...
CHICKASAW COUNTY IN NORTHEASTERN MISSISSIPPI...
SOUTHERN PONTOTOC COUNTY IN NORTHEASTERN MISSISSIPPI...
NORTHWESTERN MONROE COUNTY IN NORTHEASTERN MISSISSIPPI...
AT 451 PM CDT...A STRONG THUNDERSTORM PRODUCING PEA SIZE HAIL OR
LARGER AND WINDS AT LEAST 40 MPH WAS LOCATED NEAR BRUCE...OR 17 MILES
SOUTHEAST OF WATER VALLEY...MOVING EAST AT 25 MPH.
VERY HEAVY RAIN ALONG WITH CONTINUOUS CLOUD TO GROUND LIGHTNING ARE
ALSO POSSIBLE WITH THIS THUNDERSTORM.
PEOPLE IN CALHOUN...CHICKASAW...SOUTHERN PONTOTOC AND NORTHWESTERN
MONROE COUNTIES SHOULD MONITOR THIS STORM CLOSELY.
LAT...LON 3415 8950 3414 8882 3408 8882 3408 8872
3409 8872 3409 8871 3381 8872 3381 8893
3375 8893 3375 8903 3374 8904 3372 8950
TIME...MOT...LOC 2151Z 272DEG 20KT 3404 8935Special weather statement, Aug 18, 5:32 PM CDT, 4 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>The office that day
Everything else NWS Memphis, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 4:03 PM CDT | Special Weather Statement | MEG | Marshall | 27 min |
| Aug 18, 4:51 PM CDT | Special Weather Statement | MEG | Calhoun, Chickasaw | 39 min |
| Aug 18, 5:10 PM CDT | Severe Thunderstorm Warning | MEG | Chickasaw | 32 min |
| Aug 18, 5:32 PM CDT | Special Weather Statement | MEG | Monroe | 28 min |
Nearby
Severe Thunderstorm Warnings in Mississippi, 2015Every severe thunderstorm warning in 2015
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.