Alert archive / Tennessee / Flash Flood Warnings in 2010

Flash Flood Warning 224, NWS Memphis, TN

July 12, 2010Shelby County, Tennessee; DeSoto County, Mississippi; Crittenden County, Arkansas

NWS Memphis, TN issued this flash flood warning at Jul 12, 2010, 7:54 AM CDT for Shelby County, Tennessee; DeSoto County, Mississippi; Crittenden County, Arkansas. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 12, 2010, 7:54 AM CDT (12:54 UTC)
Expired: Jul 12, 2010, 10:00 AM CDT
In force: 2 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

Counties Crittenden County, AR, DeSoto County, MS, Shelby County, TN

The radar

The Memphis radar (KNQA), 33 km from the middle of the area, began a volume at 12:55 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 (KLZK), launched 12:00Z, 0.9 hours before the alert went out and 31 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1840 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 956 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jul 12, 6:11 AM CDT, 1 hour 43 minutes earlier.

Area forecast discussion, Jul 12, 6:11 AM CDT, 1 hour 43 minutes before

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Hazardous weather outlook, Jul 12, 4:36 AM CDT, 3 hours 18 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MEMPHIS TN
436 AM CDT MON JUL 12 2010

ARZ008-009-017-018-026>028-035-036-048-049-058-MOZ113-115-
MSZ001>017-020>024-TNZ001>004-019>021-048>055-088>092-131145-
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-
436 AM CDT MON JUL 12 2010

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

.DAY ONE...TODAY AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS WEST OF THE
MISSISSIPPI RIVER TODAY AND TONIGHT. DAMAGING WINDS WILL BE
PRIMARY SEVERE THREAT. HEAVY RAIN AND LOCALIZED FLASH FLOODING
WILL BE POSSIBLE TODAY...FOLLOWED BY AN INCREASE THREAT OF FLASH
FLOODING TONIGHT.

A FLASH FLOOD WATCH IS IN EFFECT TONIGHT FOR NORTHEAST ARKANSAS...
THE MISSOURI BOOTHEEL AND NORTHWEST TENNESSEE. FLASH FLOODING WILL
STILL BE POSSIBLE FOR AREAS OF THE MIDSOUTH OUTSIDE OF THE FLASH
FLOOD WATCH...BUT FLASH FLOODING OVER THESE AREAS WILL LIKELY BE
MORE LOCALIZED.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE FLASH FLOOD THREAT SHOULD DIMINISH BY MIDDAY TUESDAY. HOT AND
HUMID CONDITIONS WILL PREVAIL ACROSS THE MIDSOUTH FROM MIDWEEK THROUGH
THE WEEKEND. AFTERNOON HEAT INDICES MAY REACH HEAT ADVISORY CRITERIA
BY THE MIDDLE OF THE WEEK.

A FEW STRONG THUNDERSTORMS WILL BE POSSIBLE THROUGH THE WEEKEND...
MAINLY EAST OF THE MISSISSIPPI RIVER DURING THE AFTERNOON HOURS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUESTED TODAY AND TONIGHT WEST OF THE
MISSISSIPPI RIVER AND OVER NORTHWEST TENNESSEE.

PWB

In the hours before

Special weather statement, Jul 12, 2:14 AM CDT, 5 hours 40 minutes before

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Local storm report, Jul 12, 4:54 AM CDT, 3 hours before

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Local storm report, Jul 12, 7:24 AM CDT, 30 minutes before

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Local storm report, Jul 12, 7:51 AM CDT, 3 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 8:13 PM CDT	Flash Flood Warning	MEG	Carroll, Gibson, Henry, Weakley	2 hr
Jul 12, 2:47 AM CDT	Flash Flood Warning	MEG	Shelby	3 hr
Jul 12, 3:42 AM CDT	Flash Flood Warning	MEG	Shelby	3 hr
Jul 12, 4:21 AM CDT	Flash Flood Watch	MEG	Carroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more	30 hr
Jul 12, 5:39 AM CDT	Flash Flood Warning	MEG	Shelby, Tipton	3 hr
Jul 12, 6:36 AM CDT	Flash Flood Warning	MEG	Shelby	84 min
Jul 12, 8:45 AM CDT	Flash Flood Warning	MEG	Shelby, Tipton	60 min
Jul 12, 8:51 AM CDT	Flash Flood Warning	MEG	Fayette, Hardeman, Shelby	114 min
Jul 12, 4:16 PM CDT	Areal Flood Advisory	MEG	Tipton	3 hr
Jul 12, 4:17 PM CDT	Severe Thunderstorm Warning	MEG	Crockett, Haywood, Lauderdale, Madison, Tipton	43 min
Jul 12, 4:46 PM CDT	Severe Thunderstorm Warning	MEG	Fayette, Haywood, Shelby, Tipton	24 min
Jul 12, 5:52 PM CDT	Severe Thunderstorm Warning	MEG	Chester, Decatur, Henderson, Madison	38 min
Jul 11, 8:55 PM CDT	Severe Thunderstorm Warning	MEG	Greene, Lawrence, Randolph	34 min
Jul 11, 9:20 PM CDT	Flash Flood Warning	MEG	Clay, Greene, Lawrence, Randolph	3 hr
Jul 11, 10:15 PM CDT	Flash Flood Warning	MEG	Craighead, Greene, Mississippi	117 min
Jul 11, 10:22 PM CDT	Flash Flood Warning	MEG	Lawrence, Randolph	113 min
Jul 12, 1:40 AM CDT	Flash Flood Warning	MEG	Cross, Poinsett	5 hr
Jul 12, 3:52 AM CDT	Flash Flood Warning	MEG	Greene, Lawrence, Randolph	3 hr
Jul 12, 2:24 PM CDT	Severe Thunderstorm Warning	MEG	Craighead, Greene, Lawrence, Poinsett	51 min
Jul 12, 3:18 PM CDT	Severe Thunderstorm Warning	MEG	Clay, Craighead, Greene, Mississippi	30 min
Jul 12, 4:55 PM CDT	Severe Thunderstorm Warning	MEG	Lawrence	25 min
Jul 12, 4:57 PM CDT	Flash Flood Warning	MEG	Lawrence, Randolph	2 hr
Jul 12, 6:35 PM CDT	Severe Thunderstorm Warning	MEG	Lee, St. Francis	40 min
Jul 12, 6:42 PM CDT	Severe Thunderstorm Warning	MEG	Cross, Poinsett	48 min

Nearby

Flash Flood Warnings in Tennessee, 2010 Flash Flood Warnings in Mississippi, 2010 Flash Flood Warnings in Arkansas, 2010 Every flash flood warning in 2010

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.