Alert archive / Mississippi / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 424, NWS Memphis, TN

October 9, 20097 counties in Mississippi; Phillips County, Arkansas

NWS Memphis, TN issued this severe thunderstorm warning at Oct 9, 2009, 10:48 AM CDT for 7 counties in Mississippi; Phillips County, Arkansas. It was in force for 42 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
Oct 9, 2009, 10:48 AM CDT (15:48 UTC)
Expired
Oct 9, 2009, 11:30 AM CDT
In force
42 min
Issued by
NWS Memphis, TN
Area
Storm-based polygon

Counties Phillips County, AR, Coahoma County, MS, DeSoto County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Tate County, MS, Tunica County, MS

The radar

The Memphis radar (KNQA), 95 km from the middle of the area, began a volume at 15:50 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Oct 9, 8:36 AM CDTTornado WatchSPC4 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 3.8 hours before the alert went out and 40 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.

Skew-T log-pSkew-T log-p diagram, Little Rock, AR at 12:00Z on 2009-10-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 15 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 12:00Z on 2009-10-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -95 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
15 J/kg
Mixed-layer CIN
-387 J/kg
Mixed-layer LCL
468 m above ground
0-6 km bulk shear
72 kt
0-1 km storm-relative helicity
-95 m²/s²
0-3 km storm-relative helicity
146 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.5

Open this sounding in Storm Lab

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 Oct 9, 7:09 AM CDT, 3 hours 39 minutes earlier.

Area forecast discussion, Oct 9, 7:09 AM CDT, 3 hours 39 minutes before
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Hazardous weather outlook, Oct 9, 4:47 AM CDT, 6 hours 1 minute before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MEMPHIS TN
447 AM CDT FRI OCT 9 2009

ARZ008-009-017-018-026>028-035-036-048-049-058-MOZ113-115-
MSZ001>017-020>024-TNZ001>004-019>021-048>055-088>092-101200-
ALCORN-BENTON MS-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-
447 AM CDT FRI OCT 9 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST ARKANSAS...
THE MISSOURI BOOTHEEL...NORTH MISSISSIPPI...AND WEST TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

HEAVY RAINFALL OF 1 TO 4 INCHES MAY CAUSE FLASH FLOODING ACROSS
PARTS OF THE MIDSOUTH THROUGH 7 PM. A FLASH FLOOD WATCH IS IN
EFFECT FOR AREAS ALONG AND NORTH OF A CLARKSDALE MISSISSIPPI TO
IUKA MISSISSIPPI LINE.

THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS ACROSS MUCH OF
THE MIDSOUTH TODAY...BEFORE 10 AM NORTH OF INTERSTATE 40...AND
BETWEEN 8 AM AND 7 PM SOUTH OF INTERSTATE 40. THE MAIN HAZARD WILL
BE ISOLATED DAMAGING WIND OF 60 MPH.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

ADDITIONAL HEAVY RAINFALL ALONG A STATIONARY FRONT MAY CAUSE
FLOODING ALONG AND SOUTH OF INTERSTATE 40 LATE SUNDAY NIGHT
THROUGH WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTER ACTIVATION MAY BE NECESSARY THROUGH 10 AM NORTH OF
INTERSTATE 40...AND BETWEEN 8 PM AND 7 PM SOUTH OF INTERSTATE 40.

PLEASE RELAY ANY REPORTS OF FLOODING TODAY TO THE NATIONAL WEATHER
SERVICE IN MEMPHIS.

MBS

In the hours before

Local storm report, Oct 9, 6:24 AM CDT, 4 hours 24 minutes before
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Special weather statement, Oct 9, 10:08 AM CDT, 40 minutes before
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Special weather statement, Oct 9, 10:41 AM CDT, 7 minutes before
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The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 9, 6:04 AM CDTFlash Flood WarningMEGDeSoto, Tunica6 hr
Oct 9, 11:27 AM CDTSevere Thunderstorm WarningMEGCoahoma, Lafayette, Marshall, Panola, Quitman, Tallahatchie and 2 more63 min
Oct 9, 1:47 PM CDTSevere Thunderstorm WarningMEGCalhoun, Chickasaw, Yalobusha43 min
Oct 9, 2:20 PM CDTSevere Thunderstorm WarningMEGCalhoun, Chickasaw, Monroe40 min
Oct 9, 2:28 PM CDTTornado WarningMEGChickasaw, Monroe32 min
Oct 9, 2:46 PM CDTSevere Thunderstorm WarningMEGChickasaw, Itawamba, Lee, Monroe44 min
Oct 9, 2:48 PM CDTTornado WarningMEGMonroe42 min
Oct 9, 3:38 AM CDTFlash Flood WarningMEGLake6 hr
Oct 9, 9:35 AM CDTFlash Flood WarningMEGLauderdale, Tipton6 hr
Oct 9, 9:49 AM CDTFlash Flood WarningMEGDyer, Lake, Obion6 hr
Oct 8, 11:22 PM CDTSevere Thunderstorm WarningMEGRandolph45 min
Oct 9, 12:22 AM CDTFlash Flood WarningMEGClay, Greene, Lawrence, Randolph14 hr

Nearby

Severe Thunderstorm Warnings in Mississippi, 2009Severe Thunderstorm Warnings in Arkansas, 2009Every severe thunderstorm warning in 2009

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.