Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Nashville, TN

March 17, 2021Marshall County, Tennessee

NWS Nashville, TN issued this special weather statement at Mar 17, 2021, 9:54 PM CDT for Marshall County, Tennessee. It was in force for 36 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: Mar 17, 2021, 9:54 PM CDT (02:54 UTC)
Expired: Mar 17, 2021, 10:30 PM CDT
In force: 36 min
Issued by: NWS Nashville, TN

County Marshall County, TN

The radar

The Northeast Alabama radar (KHTX), 76 km from the middle of the area, began a volume at 02:57 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.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 2.9 hours before the alert went out and 90 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: 51 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 623 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 249 m²/s²
0-3 km storm-relative helicity: 168 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 Nashville, TN wrote its last area forecast discussion before this special weather statement went out at Mar 17, 8:49 PM CDT, 1 hour 5 minutes earlier.

Area forecast discussion, Mar 17, 8:49 PM CDT, 1 hour 5 minutes before

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Hazardous weather outlook, Mar 17, 9:36 AM CDT, 12 hours 18 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
936 AM CDT Wed Mar 17 2021

TNZ005>011-023>034-056>066-075-077>080-093>095-181000-
Stewart-Montgomery-Robertson-Sumner-Macon-Clay-Pickett-Houston-
Humphreys-Dickson-Cheatham-Davidson-Wilson-Trousdale-Smith-Jackson-
Putnam-Overton-Fentress-Perry-Hickman-Lewis-Williamson-Maury-
Marshall-Rutherford-Cannon-De Kalb-White-Cumberland-Bedford-Coffee-
Warren-Grundy-Van Buren-Wayne-Lawrence-Giles-
936 AM CDT Wed Mar 17 2021

This Hazardous Weather Outlook is for Middle Tennessee.

.DAY ONE...Today and tonight.

Strong to severe thunderstorms will be possible today, especially
during evening into early overnight hours across all of Middle
Tennessee. Damaging winds, large hail, tornadoes, and localized
flash flooding will all be possible.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed. Please relay any
information about observed severe weather to the NWS while following
all local, state, and CDC guidelines.

Spotter Thunderstorm Reporting Criteria...
Tornado
Funnel Cloud
Flooding
Hail >= 1/2 Inch
Winds > 50 MPH (Measured)
Structural Damage
Trees or Power Lines Down

JB Wright

In the hours before

Special weather statement, Mar 17, 4:34 PM CDT, 5 hours 20 minutes before

Special Weather Statement
National Weather Service Nashville TN
434 PM CDT Wed Mar 17 2021

TNZ093>095-172215-
Lawrence TN-Wayne TN-Giles TN-
434 PM CDT Wed Mar 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN WAYNE...LAWRENCE AND
GILES COUNTIES UNTIL 515 PM CDT...

At 433 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 9 miles south of Collinwood to 13 miles
northwest of Athens. Movement was northeast at 45 mph.

Pea size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Lawrenceburg, Pulaski, Loretto, Summertown, Ardmore, St. Joseph,
Elkton, Minor Hill, Ethridge, Lynnville, Henryville, Goodspring,
Leoma, Westpoint, Frankewing, Iron City and Prospect.

This includes Interstate 65 between mile markers 1 and 22.

LAT...LON 3501 8778 3540 8758 3540 8752 3542 8751
      3542 8745 3546 8745 3546 8733 3543 8723
      3544 8716 3545 8714 3544 8707 3541 8699
      3542 8696 3541 8692 3534 8690 3531 8691
      3530 8686 3532 8685 3529 8683 3499 8684
TIME...MOT...LOC 2133Z 210DEG 38KT 3504 8773 3494 8709

Schaper

Special weather statement, Mar 17, 4:52 PM CDT, 5 hours 2 minutes before

Special Weather Statement
National Weather Service Nashville TN
452 PM CDT Wed Mar 17 2021

TNZ007-008-027-028-059-062-172230-
Rutherford TN-Robertson TN-Williamson TN-Davidson TN-Wilson TN-
Sumner TN-
452 PM CDT Wed Mar 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR DAVIDSON...NORTHWESTERN
RUTHERFORD...SUMNER...NORTHERN WILLIAMSON...WESTERN WILSON AND
EASTERN ROBERTSON COUNTIES UNTIL 530 PM CDT...

At 451 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Cross Plains to near Fairview. Movement
was east at 40 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Murfreesboro, Franklin, Gallatin, Lebanon, Springfield, Nashville,
Madison, Hendersonville, Smyrna, Brentwood, La Vergne, Mount Juliet,
Goodlettsville, White House, Millersville, Greenbrier, Nolensville,
Forest Hills, Oak Hill and Belle Meade.

LAT...LON 3664 8624 3583 8647 3585 8717 3605 8705
      3604 8704 3609 8704 3613 8700 3618 8699
      3661 8676 3665 8659 3663 8657 3665 8651
TIME...MOT...LOC 2151Z 264DEG 36KT 3656 8672 3593 8705

13

Special weather statement, Mar 17, 5:10 PM CDT, 4 hours 44 minutes before

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Special weather statement, Mar 17, 9:54 PM CDT, 0 minutes before

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The office that day

Everything else NWS Nashville, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 17, 9:07 PM CDT	Areal Flood Advisory	OHX	Bedford, Giles, Lawrence, Lewis, Marshall, Maury and 1 more	3 hr
Mar 18, 5:00 AM CDT	River Flood Advisory	OHX	Bedford	4 hr
Mar 18, 5:02 AM CDT	River Flood Advisory	OHX	Giles	28 hr
Mar 18, 7:17 AM CDT	River Flood Advisory	OHX	Lawrence	7 hr
Mar 18, 8:23 AM CDT	River Flood Advisory	OHX	Grundy	6 hr
Mar 18, 4:22 PM CDT	River Flood Advisory	OHX	Decatur, Hardin, Perry, Wayne	34 days

Nearby

Special Weather Statements in Tennessee, 2021 Every special weather statement in 2021

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.