Alert archive / Mississippi / Flash Flood Watches in 2011
Flash Flood Watch 6, NWS Memphis, TN
NWS Memphis, TN issued this flash flood watch at Apr 23, 2011, 9:31 AM CDT for 8 counties in Mississippi; Lake County, Obion County, Tennessee; 4 counties in Arkansas. It took effect at Apr 23, 2011, 12:00 PM CDT. It was in force for 4 days.
The area
The counties it named.
The facts
- Issued
- Apr 23, 2011, 9:31 AM CDT (14:31 UTC)
- In effect from
- Apr 23, 2011, 12:00 PM CDT
- Expired
- Apr 27, 2011, 6:44 PM CDT
- In force
- 4 days
- Issued by
- NWS Memphis, TN
- Flood severity
- None
Counties Clay County, AR, Greene County, AR, Lawrence County, AR, Randolph County, AR, Calhoun County, MS, Chickasaw County, MS, Itawamba County, MS, Lee County, MS, Monroe County, MS, Pontotoc County, MS, Tallahatchie County, MS, Yalobusha County, MS, Lake County, TN, Obion County, TN
The radar
The Memphis radar (KNQA), 45 km from the middle of the area, began a volume at 14:34 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, 2.5 hours before the alert went out and 37 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
- 1696 J/kg
- Mixed-layer CIN
- -99 J/kg
- Mixed-layer LCL
- 677 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 216 m²/s²
- 0-3 km storm-relative helicity
- 243 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 12.4
What forecasters said that day
The local office's own words before this flash flood watch 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 watch went out at Apr 23, 6:38 AM CDT, 2 hours 53 minutes earlier.
Area forecast discussion, Apr 23, 6:38 AM CDT, 2 hours 53 minutes before
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</html>Hazardous weather outlook, Apr 23, 5:02 AM CDT, 4 hours 29 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MEMPHIS TN 502 AM CDT SAT APR 23 2011 ARZ008-009-017-018-026>028-035-036-048-049-058-MOZ113-115- MSZ001>017-020>024-TNZ001>004-019>021-048>055-088>092-241215- 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- 502 AM CDT SAT APR 23 2011 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 FOR SEVERE THUNDERSTORMS TODAY AND TONIGHT GENERALLY ALONG AND NORTH OF THE INTERSTATE TO CORRIDOR. THESE STORMS COULD PRODUCE LARGE HAIL AND DAMAGING WINDS AND SHORT LIVED TORNADOES. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY A MUCH BETTER CHANCE FOR SEVERE THUNDERSTORMS APPEARS PROBABLE EARLY NEXT WEEK. TWO STRONG SYSTEMS WILL TRACK NORTH OF THE MIDSOUTH BETWEEN MONDAY AND WEDNESDAY. DAMAGING WINDS...VERY LARGE HAIL AND TORNADOES ARE POSSIBLE MONDAY. A GREATER THREAT OF STRONG LONG TRACKED TORNADOES IS EXPECTED ON WEDNESDAY ALONG WITH DAMAGING WIND AND LARGE HAIL. MULTIPLE ROUNDS OF THUNDERSTORMS MONDAY THROUGH WEDNESDAY WILL BRING SEVERAL INCHES OF RAIN TO THE MIDSOUTH RESULTING IN THE THREAT FOR FLASH FLOODING. THE HIGHEST THREAT AREA APPEARS TO BE ALONG AND NORTH OF THE TENNESSEE/MISSISSIPPI STATE LINE AT THIS TIME. AREA RIVERS WILL RISE THROUGH NEXT WEEK...AND SIGNIFICANT RIVER FLOODING IS POSSIBLE ON THE MISSISSIPPI BY LATE NEXT WEEK AS HEAVY RAINFALL UPSTREAM OVER THE NEXT FEW DAYS BEGINS TO WORK ITS WAY SOUTH. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED NEXT WEEK. 30/SIRMON
The office that day
Everything else NWS Memphis, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 3:15 PM CDT | Severe Thunderstorm Warning | MEG | Obion, Weakley | 30 min |
| Apr 23, 12:34 PM CDT | Special Weather Statement | MEG | Randolph | 41 min |
| Apr 23, 2:50 PM CDT | Special Weather Statement | MEG | Randolph | 25 min |
| Apr 23, 3:07 PM CDT | Special Weather Statement | MEG | Clay | 23 min |
| Apr 23, 3:34 PM CDT | Areal Flood Advisory | MEG | Clay, Greene | 116 min |
| Apr 23, 4:30 PM CDT | River Flood Warning | MEG | Clay, Greene | 44 days |
| Apr 23, 4:30 PM CDT | River Flood Warning | MEG | St. Francis | 39 days |
Nearby
Flash Flood Watches in Mississippi, 2011Flash Flood Watches in Arkansas, 2011Flash Flood Watches in Tennessee, 2011Every flash flood watch in 2011
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.