Alert archive / Mississippi / Flash Flood Warnings in 2017

Flash Flood Warning 40, NWS Jackson, MS

May 12, 2017Grenada County, Mississippi

NWS Jackson, MS issued this flash flood warning at May 12, 2017, 6:55 PM CDT for Grenada County, Mississippi. It was in force for 2 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 12, 2017, 6:55 PM CDT (23:55 UTC)
Expired: May 12, 2017, 9:00 PM CDT
In force: 2 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

County Grenada County, MS

The radar

The Columbus AFB radar (KGWX), 137 km from the middle of the area, began a volume at 23:57 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.

What was reported inside it

Time	Report	Where	Remark
May 12, 7:30 PM CDT	FLASH FLOOD	1 N Grenada, MS	FLASH FLOODING OCCURRED IN DOWNTOWN GRENADA.
May 12, 7:30 PM CDT	FLASH FLOOD	1 Nne Grenada, MS	6 HOME AND 6 BUSINESSES REPORTED FLOODED IN GRENADA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Little Rock, AR (KBYH), launched 12:00Z, 11.9 hours before the alert went out and 113 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: 113 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

670 
WGUS54 KJAN 122355
FFWJAN
MSC043-130200-
/O.NEW.KJAN.FF.W.0040.170512T2355Z-170513T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jackson MS
655 PM CDT FRI MAY 12 2017

The National Weather Service in Jackson has issued a

* Flash Flood Warning for...
  Grenada County in north central Mississippi...

* Until 900 PM CDT

* At 653 PM CDT, emergency management reported thunderstorms 
  producing heavy rain across the warned area with two homes flooded 
  in the city of Grenada. Up to two inches of rain have already 
  fallen. Flash flooding is either underway or expected to begin 
  shortly.

* Some locations that will experience flooding include...
  Grenada, Gore Springs, Bew Springs, Misterton, Holcomb and Elliott.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3387 8977 3387 8951 3368 8951 3368 8999
      3381 8998 3382 8998 3383 8993 3390 8992
      3390 8977

$$

TW

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 11, 11:43 PM CDT	Special Weather Statement	JAN	Bolivar, Sunflower	32 min
May 12, 2:04 AM CDT	Special Weather Statement	JAN	Montgomery	26 min
May 12, 2:39 AM CDT	Special Weather Statement	JAN	Webster	51 min
May 12, 9:49 AM CDT	Special Weather Statement	JAN	Covington, Jones	41 min
May 12, 10:08 AM CDT	Special Weather Statement	JAN	Jones	52 min
May 12, 10:29 AM CDT	Special Weather Statement	JAN	Jones	46 min
May 12, 10:48 AM CDT	Special Weather Statement	JAN	Jones	42 min
May 12, 2:44 PM CDT	Special Weather Statement	JAN	Lawrence	46 min
May 12, 3:05 PM CDT	Severe Thunderstorm Warning	JAN	Jefferson Davis, Lawrence	40 min
May 12, 3:44 PM CDT	Special Weather Statement	JAN	Jefferson Davis	31 min
May 12, 3:49 PM CDT	Special Weather Statement	JAN	Bolivar	26 min
May 12, 4:12 PM CDT	Special Weather Statement	JAN	Covington	33 min
May 12, 4:17 PM CDT	Special Weather Statement	JAN	Washington	43 min
May 12, 4:52 PM CDT	Special Weather Statement	JAN	Sunflower	23 min
May 12, 5:05 PM CDT	Special Weather Statement	JAN	Washington	25 min
May 12, 5:21 PM CDT	Special Weather Statement	JAN	Leake	24 min
May 12, 5:23 PM CDT	Special Weather Statement	JAN	Sharkey	37 min
May 12, 5:25 PM CDT	Severe Thunderstorm Warning	JAN	Leake, Neshoba, Scott	50 min
May 12, 5:28 PM CDT	Special Weather Statement	JAN	Grenada	32 min
May 12, 5:32 PM CDT	Severe Thunderstorm Warning	JAN	Grenada, Montgomery	24 min
May 12, 6:04 PM CDT	Special Weather Statement	JAN	Carroll	26 min
May 12, 6:15 PM CDT	Severe Thunderstorm Warning	JAN	Attala, Leake, Neshoba, Winston	18 min
May 12, 6:20 PM CDT	Special Weather Statement	JAN	Montgomery	25 min
May 12, 6:26 PM CDT	Special Weather Statement	JAN	Grenada	34 min
May 12, 6:40 PM CDT	Special Weather Statement	JAN	Winston	35 min
May 12, 6:42 PM CDT	Special Weather Statement	JAN	Carroll	33 min
May 12, 6:47 PM CDT	Special Weather Statement	JAN	Yazoo	43 min

Nearby

Flash Flood Warnings in Mississippi, 2017 Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.