Alert archive / Texas / Flash Flood Warnings in 2015

Flash Flood Warning 13, NWS Fort Worth, TX

April 24, 2015Grayson County, Texas

NWS Fort Worth, TX issued this flash flood warning at Apr 24, 2015, 6:32 PM CDT for Grayson County, Texas. It was in force for 3 hr. 1 report 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: Apr 24, 2015, 6:32 PM CDT (23:32 UTC)
Expired: Apr 24, 2015, 9:30 PM CDT
In force: 3 hr
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Flood severity: None

County Grayson County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 142 km from the middle of the area, began a volume at 23:34 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.

What was reported inside it

Time	Report	Where	Remark
Apr 24, 7:30 PM CDT	FLASH FLOOD	Sherman, TX	SEVERAL ROADS CLOSED IN GRAYSON COUNTY FROM ONGOING FLOODING, DEEPEST SPOTS ABOUT 1.5 FEET

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

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 11.5 hours before the alert went out and 118 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: 1508 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 506 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 309 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 4.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

256 
WGUS54 KFWD 242332
FFWFWD
TXC181-250230-
/O.NEW.KFWD.FF.W.0013.150424T2332Z-150425T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FORT WORTH TX
632 PM CDT FRI APR 24 2015

THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  GRAYSON COUNTY IN NORTH CENTRAL TEXAS...

* UNTIL 930 PM CDT
    
* AT 628 PM CDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING 
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO THREE INCHES OF RAIN HAVE 
  ALREADY FALLEN. FLASH FLOODING IS EXPECTED.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  SHERMAN...DENISON...WHITESBORO...VAN ALSTYNE...HOWE...POTTSBORO...
  COLLINSVILLE...WHITEWRIGHT...GUNTER...BELLS...TOM BEAN...
  KNOLLWOOD...DORCHESTER...SOUTHMAYD...TIOGA...SADLER AND LUELLA.

ADDITIONAL RAINFALL AMOUNTS OF UP TO 1 INCH ARE POSSIBLE IN THE 
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 3377 9650 3378 9643 3376 9641 3375 9641
      3373 9638 3340 9639 3342 9694 3364 9694
      3381 9653

$$

AJS

The office that day

Everything else NWS Fort Worth, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 23, 8:36 PM CDT	River Flood Warning	FWD	Leon, Robertson	9 days
Apr 24, 5:13 AM CDT	Areal Flood Advisory	FWD	Denton, Wise	2 hr
Apr 24, 6:19 AM CDT	Areal Flood Advisory	FWD	Collin	56 min
Apr 24, 9:12 AM CDT	River Flood Warning	FWD	Collin	49 hr
Apr 24, 11:28 AM CDT	Flash Flood Warning	FWD	Denton, Wise	3 hr
Apr 24, 12:02 PM CDT	Flash Flood Warning	FWD	Collin	3 hr
Apr 24, 12:06 PM CDT	Flash Flood Watch	FWD	Collin, Cooke, Dallas, Delta, Denton, Fannin and 12 more	9 hr
Apr 24, 2:37 PM CDT	Areal Flood Advisory	FWD	Cooke, Grayson	3 hr
Apr 24, 3:08 PM CDT	River Flood Warning	FWD	Denton	45 hr
Apr 24, 3:23 PM CDT	Areal Flood Advisory	FWD	Fannin, Lamar	112 min
Apr 24, 4:27 PM CDT	Severe Thunderstorm Warning	FWD	Comanche, Eastland	63 min
Apr 24, 4:33 PM CDT	Flash Flood Warning	FWD	Fannin, Grayson	117 min
Apr 24, 4:41 PM CDT	Special Weather Statement	FWD	Parker	34 min
Apr 24, 4:48 PM CDT	River Flood Warning	FWD	Hunt	45 hr
Apr 24, 4:50 PM CDT	Tornado Warning	FWD	Comanche, Eastland	25 min
Apr 24, 4:55 PM CDT	Areal Flood Advisory	FWD	Montague	65 min
Apr 24, 5:03 PM CDT	Severe Thunderstorm Warning	FWD	Erath	57 min
Apr 24, 5:07 PM CDT	Special Weather Statement	FWD	Tarrant	38 min
Apr 24, 5:22 PM CDT	Areal Flood Advisory	FWD	Denton, Tarrant	53 min
Apr 24, 5:33 PM CDT	Special Weather Statement	FWD	Cooke	27 min
Apr 24, 5:37 PM CDT	Severe Thunderstorm Warning	FWD	Erath, Hood, Somervell	53 min
Apr 24, 5:39 PM CDT	Areal Flood Advisory	FWD	Cooke	66 min
Apr 24, 5:44 PM CDT	Special Weather Statement	FWD	Denton	31 min
Apr 24, 5:48 PM CDT	Special Weather Statement	FWD	Parker	27 min
Apr 24, 6:03 PM CDT	Severe Thunderstorm Warning	FWD	Johnson, Parker, Tarrant	57 min
Apr 24, 6:07 PM CDT	Special Weather Statement	FWD	Denton	23 min
Apr 24, 6:09 PM CDT	Flash Flood Warning	FWD	Denton	2 hr
Apr 24, 6:23 PM CDT	Areal Flood Advisory	FWD	Parker, Tarrant	2 hr
Apr 24, 6:28 PM CDT	Tornado Warning	FWD	Tarrant	19 min
Apr 24, 6:38 PM CDT	Severe Thunderstorm Warning	FWD	Dallas, Ellis	67 min
Apr 24, 6:43 PM CDT	Tornado Warning	FWD	Ellis, Johnson	32 min
Apr 24, 6:56 PM CDT	Areal Flood Advisory	FWD	Dallas	2 hr

Nearby

Flash Flood Warnings in Texas, 2015 Every flash flood 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.