Alert archive / Texas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 281, NWS Fort Worth, TX

July 2, 2017Grayson County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Jul 2, 2017, 10:58 PM CDT for Grayson County, Texas. It was in force for 47 min. 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 2, 2017, 10:58 PM CDT (03:58 UTC)
Expired: Jul 2, 2017, 11:45 PM CDT
In force: 47 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Grayson County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 131 km from the middle of the area, began a volume at 03:59 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

Fort Worth, TX (KFWD), launched 00:00Z, 4.0 hours before the alert went out and 105 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: 1618 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 1837 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.4

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 Jul 2, 9:13 PM CDT, 1 hour 45 minutes earlier.

Area forecast discussion, Jul 2, 9:13 PM CDT, 1 hour 45 minutes before

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Hazardous weather outlook, Jul 2, 9:13 PM CDT, 1 hour 45 minutes before

Hazardous Weather Outlook
National Weather Service Fort Worth TX
913 PM CDT Sun Jul 2 2017

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-040215-
Montague-Cooke-Grayson-Fannin-Lamar-Young-Jack-Wise-Denton-Collin-
Hunt-Delta-Hopkins-Stephens-Palo Pinto-Parker-Tarrant-Dallas-
Rockwall-Kaufman-Van Zandt-Rains-Eastland-Erath-Hood-Somervell-
Johnson-Ellis-Henderson-Comanche-Mills-Hamilton-Bosque-Hill-Navarro-
Freestone-Anderson-Lampasas-Coryell-Bell-McLennan-Falls-Limestone-
Leon-Milam-Robertson-
913 PM CDT Sun Jul 2 2017

This Hazardous Weather Outlook is for North and Central Texas.

.DAY ONE...Tonight.
A cluster of thunderstorms will affect areas that are both north of
I-20 and east of I-35 during the overnight hours. Some strong to
severe storms with damaging winds and hail will be possible. In
addition, flooding resulting from very heavy rainfall will be of
concern, expecially across northeast Texas.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.
Daytime temperatures will steadily climb early this week. With
considerable humidity, heat index values will exceed 100 both Monday
and Tuesday. On Independence Day, some locations will see the heat
index top 105.

Thunderstorm chances will continue Monday through Wednesday,
primarily along and north of the I-20 corridor. Lightning will be
the primary hazard for outdoor activities during the holiday period,
but gusty winds will also accompany the stronger storms. The
thunderstorm potential will continue into Thursday primarily east of
the I-35 corridor.

.SPOTTER INFORMATION STATEMENT...
Limited spotter activation may be requested tonight north of the
I-20 corridor.

Stalley

In the hours before

Special weather statement, Jul 2, 10:17 PM CDT, 41 minutes before

Special Weather Statement
National Weather Service Fort Worth TX
1017 PM CDT SUN JUL 2 2017

TXZ092-093-030400-
Grayson TX-Cooke TX-
1017 PM CDT SUN JUL 2 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN COOKE AND CENTRAL
GRAYSON COUNTIES UNTIL 1100 PM CDT...

At 1016 PM CDT, Doppler radar was tracking a strong thunderstorm near
Marietta, moving southeast at 30 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

This strong thunderstorm will be near...
  Sherman, Pottsboro and Knollwood around 1045 PM CDT.

Other locations impacted by this storm include Sadler.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3387 9688 3387 9680 3382 9676 3384 9669
      3392 9666 3389 9660 3384 9662 3382 9653
      3377 9650 3377 9642 3373 9638 3364 9638
      3372 9711 3380 9709 3382 9705 3385 9709
      3385 9701 3389 9698 3395 9699 3396 9692
TIME...MOT...LOC 0316Z 297DEG 24KT 3388 9705

Dunn

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 10:17 PM CDT	Special Weather Statement	FWD	Grayson	43 min
Jul 2, 11:44 PM CDT	Areal Flood Advisory	FWD	Grayson	2 hr
Jul 2, 11:46 PM CDT	Special Weather Statement	FWD	Fannin, Grayson	29 min
Jul 3, 12:02 AM CDT	Areal Flood Advisory	FWD	Lamar	118 min
Jul 3, 12:16 AM CDT	Special Weather Statement	FWD	Delta, Fannin, Lamar	44 min
Jul 3, 12:24 AM CDT	Severe Thunderstorm Warning	FWD	Fannin	36 min
Jul 3, 12:38 AM CDT	Severe Thunderstorm Warning	FWD	Delta, Lamar	52 min
Jul 3, 1:03 AM CDT	Special Weather Statement	FWD	Delta, Hopkins, Hunt	42 min
Jul 3, 2:28 AM CDT	Special Weather Statement	FWD	Fannin	32 min
Jul 3, 2:41 AM CDT	Areal Flood Advisory	FWD	Fannin, Lamar	4 hr
Jul 3, 2:59 AM CDT	Special Weather Statement	FWD	Fannin	31 min
Jul 3, 3:07 AM CDT	Severe Thunderstorm Warning	FWD	Fannin	38 min
Jul 3, 3:34 AM CDT	Severe Thunderstorm Warning	FWD	Fannin, Lamar	56 min
Jul 3, 3:48 AM CDT	Flash Flood Warning	FWD	Fannin, Lamar	3 hr
Jul 3, 3:58 AM CDT	Severe Thunderstorm Warning	FWD	Lamar	47 min
Jul 3, 4:54 AM CDT	Special Weather Statement	FWD	Delta, Lamar	81 min
Jul 3, 6:16 AM CDT	Special Weather Statement	FWD	Delta, Lamar	59 min
Jul 3, 6:46 AM CDT	Flash Flood Warning	FWD	Fannin, Lamar	119 min
Jul 3, 7:40 AM CDT	Special Weather Statement	FWD	Lamar	65 min
Jul 3, 7:57 AM CDT	Special Weather Statement	FWD	Delta, Hopkins	48 min

Nearby

Severe Thunderstorm Warnings in Texas, 2017 Every severe thunderstorm 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.