Alert archive / Texas / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 198, NWS Fort Worth, TX

August 14, 2002Johnson County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Aug 14, 2002, 3:55 PM CDT for Johnson County, Texas. It was in force for 65 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Aug 14, 2002, 3:55 PM CDT (20:55 UTC)
Expired: Aug 14, 2002, 5:00 PM CDT
In force: 65 min
Issued by: NWS Fort Worth, TX
Area: Counties, with a storm outline in the text

County Johnson County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 22 km from the middle of the area, began a volume at 20:56 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
Aug 14, 4:25 PM CDT	Hail 1.75	Cleburne, TX

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 8.9 hours before the alert went out and 51 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: 2317 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 724 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Fort Worth, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 14, 3:48 PM CDT, 7 minutes earlier.

Area forecast discussion, Aug 14, 3:48 PM CDT, 7 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FORT WORTH TX
348 PM CDT WED AUG 14 2002

WILL BE BRIEF....

ISOLATED THUNDERSTORMS FORMING ALONG OLD FRONT RUNNING NE-SW ACROSS
METROPLEX.  ONE OR TWO OF THESE STORMS COULD BRIEFLY BECOME SEVERE
THIS EVENING BEFORE DYING AFTER SUNSET.

INTERESTING FORECAST THROUGH SATURDAY AS DISTURBANCE IN NW GOMEX
POSES FORECAST PROBLEMS.  FEEL ETA HAS BEST HANDLE ON CURRENT TRENDS
IN UPPER LEVELS WITH POSITIVELY-TILTED RIDGE BUILDING N OF AREA AND
DIGGING TROUGH/SHORTWAVE OVER TEXAS.  SHORTWAVE OVER TEXAS IS
BECOMING INCREASINGLY NEGATIVELY TILTED AS TROUGH DIGS S AND
DISTURBANCE OVER NW GOMEX PROPAGATES NW.  ETA INDICATES THAT THE TWO
EVENTUALLY MAY MERGE OVER SE TEXAS AND SPREAD LARGE AREA OF PCPN
OVER EASTERN HALF OF CWA THROUGH SATURDAY.  AFTER CONSULTING WITH
HGX HAVE DECIDED TO PLAY DOWN POPS FOR NOW BUT WILL INTRODUCE CHANCE
CATEGORY EXTREME SE CWA THURSDAY AFTERNOON SPREADING OVER EASTERN
HALF OF CWA FRIDAY AND FRIDAY NIGHT. EXPECT PRECIP/CLOUDS TO MOVE
OUT BY SATURDAY.

LONG TERM...RETURN TO SUMMER TIME.  MID TO UPPER 90S OVER CWA SUN
THRU WED.  WARMING 700 MB TEMPS INDICATE SUFFICIENT CAPPING TO
PREVENT THUNDERSTORM FORMATION DURING THE EXTENDED.

DFW   70  94  73  92 /  10   0  30  30
ACT   73  92  74  92 /  10  30  30  30
PRX   68  92  71  90 /  10   0  20  30
DTO   68  93  72  92 /  10   0  20  20
TKI   69  94  72  92 /  10   0  20  20
DAL   71  94  74  93 /  10   0  30  30
TRL   72  94  73  91 /  10   0  30  30
CRS   73  93  74  91 /  10  30  30  30
TPL   74  91  74  95 /  10  30  30  30

ROBBINS

.FWD...
TX...NONE.

In the hours before

Special weather statement, Aug 14, 3:50 PM CDT, 5 minutes before

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-150300-

HAZARDOUS WEATHER OUTLOOK FOR NORTH TEXAS
NATIONAL WEATHER SERVICE FORT WORTH TX
350 PM CDT WED AUG 14 2002

THUNDERSTORMS ARE POSSIBLE THROUGH EARLY EVENING ALONG AND EAST OF A
COMANCHE...TO FORT WORTH...TO SHERMAN LINE. THUNDERSTORMS ARE NOT
EXPECTED TO BECOME SEVERE...BUT WILL PRODUCE DANGEROUS CLOUD TO
GROUND LIGHTNING AND BRIEF HEAVY RAIN. A FEW STORMS COULD ALSO
PRODUCE BRIEF WIND GUSTS TO 45 MPH.

OTHERWISE...HAZARDOUS WEATHER IS NOT EXPECTED ACROSS NORTH TEXAS
THROUGH TONIGHT.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 11:13 PM CDT	Severe Thunderstorm Warning	FWD	Grayson	62 min
Aug 14, 12:02 AM CDT	Severe Thunderstorm Warning	FWD	Cooke	28 min
Aug 14, 1:42 AM CDT	Severe Thunderstorm Warning	FWD	Fannin, Lamar	48 min
Aug 14, 4:32 PM CDT	Flash Flood Warning	FWD	Johnson	3 hr
Aug 14, 5:11 PM CDT	Severe Thunderstorm Warning	FWD	Bosque	64 min
Aug 14, 6:47 PM CDT	Flash Flood Warning	FWD	Erath	118 min

Nearby

Severe Thunderstorm Warnings in Texas, 2002 Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.