Alert archive / Texas / Special Weather Statements in 2017

Special Weather Statement, NWS Fort Worth, TX

October 21, 2017Fannin County, Texas

NWS Fort Worth, TX issued this special weather statement at Oct 21, 2017, 11:21 PM CDT for Fannin County, Texas. It was in force for 54 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Oct 21, 2017, 11:21 PM CDT (04:21 UTC)
Expired: Oct 22, 2017, 12:15 AM CDT
In force: 54 min
Issued by: NWS Fort Worth, TX

County Fannin County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 172 km from the middle of the area, began a volume at 04:20 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, 4.4 hours before the alert went out and 150 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: 1142 J/kg
Mixed-layer CIN: -102 J/kg
Mixed-layer LCL: 1889 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.9

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Oct 21, 11:12 PM CDT, 9 minutes earlier.

Area forecast discussion, Oct 21, 11:12 PM CDT, 9 minutes before

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Hazardous weather outlook, Oct 21, 10:26 PM CDT, 55 minutes before

Hazardous Weather Outlook
National Weather Service Fort Worth TX
1026 PM CDT Sat Oct 21 2017

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-221100-
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-
1026 PM CDT Sat Oct 21 2017

This Hazardous Weather Outlook is for North and Central Texas.

.DAY ONE...Tonight.
A line of strong to severe thunderstorms will move southeast across
North and Central Texas overnight tonight ahead of a strong cold
front. Damaging winds will be the main threat, but large hail may
also occur. In addition, a few tornadoes may be embedded within the
line. These type of tornadoes are usually fast moving and difficult
to see. Heavy rainfall may also result in localized flash flooding.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.
There will be an elevated fire weather danger on Tuesday with gusty
north winds and low humidity.

There is a low chance of thunderstorms east of I-35 on Friday.

.SPOTTER INFORMATION STATEMENT...
Spotter activation may be needed across North and Central Texas
overnight as the line of strong to severe storms move across the
region.

In the hours before

Special weather statement, Oct 21, 8:33 PM CDT, 2 hours 48 minutes before

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Special weather statement, Oct 21, 9:32 PM CDT, 1 hour 49 minutes before

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Special weather statement, Oct 21, 9:55 PM CDT, 1 hour 26 minutes before

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Special weather statement, Oct 21, 10:07 PM CDT, 1 hour 14 minutes before

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Special weather statement, Oct 21, 10:20 PM CDT, 1 hour 1 minute before

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Special weather statement, Oct 21, 11:21 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 21, 8:33 PM CDT	Special Weather Statement	FWD	Young	57 min
Oct 21, 9:32 PM CDT	Special Weather Statement	FWD	Young	43 min
Oct 21, 9:55 PM CDT	Special Weather Statement	FWD	Jack	35 min
Oct 21, 10:07 PM CDT	Special Weather Statement	FWD	Montague	38 min
Oct 21, 10:20 PM CDT	Special Weather Statement	FWD	Stephens	55 min
Oct 21, 11:24 PM CDT	Special Weather Statement	FWD	Cooke, Grayson	66 min
Oct 21, 11:31 PM CDT	Special Weather Statement	FWD	Stephens	59 min
Oct 21, 11:51 PM CDT	Special Weather Statement	FWD	Collin, Denton	54 min
Oct 21, 11:58 PM CDT	Special Weather Statement	FWD	Collin, Dallas, Rockwall, Tarrant	47 min
Oct 22, 12:12 AM CDT	Special Weather Statement	FWD	Fannin	63 min
Oct 22, 12:46 AM CDT	Special Weather Statement	FWD	Lamar	44 min
Oct 22, 12:50 AM CDT	Special Weather Statement	FWD	Delta	55 min

Nearby

Special Weather Statements in Texas, 2017 Every special weather statement 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.