Alert archive / West Virginia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 77, NWS Pittsburgh, PA

June 21, 20214 counties in West Virginia; Belmont County, Monroe County, Ohio; Greene County, Washington County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 21, 2021, 4:19 PM EDT for 4 counties in West Virginia; Belmont County, Monroe County, Ohio; Greene County, Washington County, Pennsylvania. It was in force for 41 min. 3 reports 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: Jun 21, 2021, 4:19 PM EDT (20:19 UTC)
Expired: Jun 21, 2021, 5:00 PM EDT
In force: 41 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Belmont County, OH, Monroe County, OH, Greene County, PA, Washington County, PA, Marshall County, WV, Monongalia County, WV, Ohio County, WV, Wetzel County, WV

The radar

The Pittsburgh radar (KPBZ), 83 km from the middle of the area, began a volume at 20:20 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.

What was reported inside it

Time	Report	Where	Remark
Jun 21, 4:39 PM EDT	TSTM WND DMG	1 N Nebo, PA	TREES DOWN ACROSS WALKER HILL ROAD
Jun 21, 4:39 PM EDT	TSTM WND DMG	Bristoria, PA	UTILITY LINES DOWN ALONG BRISTORIA ROAD
Jun 21, 5:03 PM EDT	TSTM WND DMG	Aleppo, PA	MULTIPLE TREES DOWN ACROSS THE COUNTY.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 20 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 21, 12:31 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 8.3 hours before the alert went out and 75 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: 931 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 988 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 260 m²/s²
0-3 km storm-relative helicity: 277 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

As transmitted.

115 
WUUS51 KPBZ 212019
SVRPBZ
OHC013-111-PAC059-125-WVC051-061-069-103-212100-
/O.NEW.KPBZ.SV.W.0077.210621T2019Z-210621T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pittsburgh PA
419 PM EDT Mon Jun 21 2021

The National Weather Service in Pittsburgh has issued a

* Severe Thunderstorm Warning for...
  Northeastern Monroe County in east central Ohio...
  Southeastern Belmont County in east central Ohio...
  Southwestern Washington County in southwestern Pennsylvania...
  Greene County in southwestern Pennsylvania...
  Northwestern Monongalia County in northern West Virginia...
  Ohio County in northern West Virginia...
  Northern Wetzel County in northern West Virginia...
  Marshall County in northern West Virginia...

* Until 500 PM EDT.

* At 419 PM EDT, a severe thunderstorm was located near Moundsville,
  moving east at 45 mph.

  HAZARD...Wind gusts to 60 mph.

  SOURCE...Radar.

  IMPACT...Expect damage to trees and power lines, resulting in some 
           power outages.

* Locations impacted include...
  Moundsville...                    Waynesburg...
  Shadyside...                      McMechen...
  Powhatan Point...                 Glen Dale...
  Rogersville...                    West Finley...
  Clarington...                     Aleppo...
  Blacksville...                    Cameron...

This includes Interstate 79 in Pennsylvania between mile markers 7
and 17.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Move to an interior room on the lowest floor of a building.

Please report severe weather by calling 412-262-1988, posting to 
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH. 

&&

LAT...LON 3972 8098 3996 8085 4003 8054 3991 8006
      3972 8010
TIME...MOT...LOC 2019Z 276DEG 46KT 3989 8069 

HAIL...<.75IN
WIND...60MPH
 
$$

1 follow-up statement

740 
WWUS51 KPBZ 212039
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
439 PM EDT Mon Jun 21 2021

WVC069-212048-
/O.CAN.KPBZ.SV.W.0077.000000T0000Z-210621T2100Z/
Ohio WV-
439 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR OHIO COUNTY IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
east central Ohio...southwestern Pennsylvania...and northern West
Virginia.

LAT...LON 3972 8098 3991 8087 4001 8046 3991 8006
      3972 8010
TIME...MOT...LOC 2038Z 276DEG 46KT 3986 8036 

$$

OHC013-111-PAC059-125-WVC051-061-103-212100-
/O.CON.KPBZ.SV.W.0077.000000T0000Z-210621T2100Z/
Monroe OH-Belmont OH-Washington PA-Greene PA-Monongalia WV-Wetzel WV-
Marshall WV-
439 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR NORTHEASTERN MONROE...SOUTHEASTERN BELMONT...SOUTHWESTERN
WASHINGTON...GREENE...NORTHWESTERN MONONGALIA...NORTHERN WETZEL AND
MARSHALL COUNTIES...

At 438 PM EDT, a severe thunderstorm was located 9 miles west of
Waynesburg, moving east at 55 mph.

HAZARD...Wind gusts to 60 mph.

SOURCE...Radar.

IMPACT...Expect damage to trees and power lines, resulting in some 
         power outages.

Locations impacted include...
Moundsville...                    Waynesburg...
Powhatan Point...                 Glen Dale...
Rogersville...                    West Finley...
Clarington...                     Aleppo...
Blacksville...                    Cameron...
New Freeport...                   Nineveh...

This includes Interstate 79 in Pennsylvania between mile markers 7
and 17.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Move to an interior room on the lowest floor of a building.

Please report severe weather by calling 412-262-1988, posting to 
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH. 

&&

LAT...LON 3972 8098 3991 8087 4001 8046 3991 8006
      3972 8010
TIME...MOT...LOC 2038Z 276DEG 46KT 3986 8036 

HAIL...<.75IN
WIND...60MPH
 
$$

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 Pittsburgh, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 21, 12:53 PM EDT, 3 hours 26 minutes earlier.

Area forecast discussion, Jun 21, 12:53 PM EDT, 3 hours 26 minutes before

Area Forecast Discussion
National Weather Service Pittsburgh PA
1253 PM EDT Mon Jun 21 2021

.SYNOPSIS...
Thunderstorms, potentially strong to severe, are expected this
afternoon and early evening with a crossing cold front. Cooler and
dry conditions expected Tuesday followed by a warming trend through
the week.

&&

.NEAR TERM /THROUGH TONIGHT/...
Sfc low pressure across the Great Lakes will shift northeastward
into southern Ontario as a trailing cold front crosses the upper
Ohio Valley today. Convection ahead of the front is already underway
and with ML CAPE values in excess of 2000 J/kg, 35kts, effective
shear, and steep low level lapse rates, severe weather will be
possible with damaging winds the primary threat. Tornadoes will also
be possible with discreet storms as latest hodographs and expected
storm motion will be ideal for streamwise vorticity into storms.
Large hail isn't completely out of the question with discreet cells
ahead of the front but 50dbz cores would need to be at least 35kft or
so before that became a possibility. A Severe Thunderstorm Watch has
been issued for the entire forecast area and runs until 7PM this
evening.

Minor flooding is also possible given high PWATs, but quick storm
motion should prevent more widespread concerns.

Storms will end with FROPA this evening followed by post- frontal
showers overnight.

&&

.SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/...
Dry and seasonably cool conditions expected Tuesday in the wake of
the front with afternoon temperatures in the 60s for most of the
area, and lows dipping into the 40s Tuesday night.

&&

.LONG TERM /WEDNESDAY THROUGH MONDAY/...
Building sfc high pressure will promote continued dry weather through
the work week under relatively low amplitude ern CONUS troughing.
High temperatures will rapidly moderate back into the 80s by
Thursday.

The next rain chance will come with the progged approach of a weekend
long wave trough.

&&

.AVIATION /18Z MONDAY THROUGH SATURDAY/...
A shortwave trough and sfc cold front will approach and pass the
region through tonight and provide increased chances for showers and
thunderstorms. Timing for convection should peak during the aftn
just ahead of a prefrontal trough associated with a SW to W wind
wind shift, with any thunderstorms capable of producing erratic,
gusty wind and rapidly lower vsbys. Conditions will generally dry out
after the prefrontal trough passage, though iso/sct showers will
remain possible as the cold front passes shortly thereafter.

Showers will dissipate after cold fropa, but the lagging upper trough
may maintain light rain S/E of PIT into Tuesday morning. MVFR to
localized IFR cigs are likely overnight amid strong cold advection.
Diurnal heating/mixing of drier air with developing high pressure
will return most terminals to VFR by Tuesday aftn.

.Outlook...
VFR conditions are likely for much of the week under the influence of
high pressure.

&&

.PBZ WATCHES/WARNINGS/ADVISORIES...
PA...None.
OH...None.
WV...None.

&&

Hazardous weather outlook, Jun 21, 4:04 PM EDT, 15 minutes before

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
404 PM EDT Mon Jun 21 2021

OHZ059-068-069-PAZ015-016-021>023-029-031-073>076-WVZ002>004-012-021-
509>514-222015-
Belmont-Noble-Monroe-Clarion-Jefferson PA-Allegheny-Armstrong-
Indiana-Washington-Greene-Westmoreland-
Higher Elevations of Westmoreland-Fayette-
Higher Elevations of Fayette-Brooke-Ohio-Marshall-Wetzel-Marion-
Monongalia-Ridges of Eastern Monongalia and Northwestern Preston-
Preston-Eastern Preston-Western Tucker-Eastern Tucker-
404 PM EDT Mon Jun 21 2021

...SEVERE THUNDERSTORM WATCH 299 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for east central Ohio, northwest
Pennsylvania, southwest Pennsylvania, western Pennsylvania,
northern West Virginia and the northern panhandle of West Virginia.

.DAY ONE...Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

OHZ039>041-048>050-057-058-PAZ007>009-013-014-020-WVZ001-222015-
Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH-
Muskingum-Guernsey-Mercer-Venango-Forest-Lawrence-Butler-Beaver-
Hancock-
404 PM EDT Mon Jun 21 2021

This Hazardous Weather Outlook is for east central Ohio, northwest
Pennsylvania, southwest Pennsylvania, western Pennsylvania and
northern West Virginia.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

In the hours before

Local storm report, Jun 21, 3:55 PM EDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
355 PM EDT MON JUN 21 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0310 PM     TSTM WND DMG     1 N WEIRTON             40.41N  80.57W
06/21/2021                   HANCOCK            WV   LAW ENFORCEMENT

            TREES DOWN ON GREENBRIER ROAD

&&

EVENT NUMBER PBZ2101754

AMILLER

Local storm report, Jun 21, 4:07 PM EDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
407 PM EDT MON JUN 21 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0338 PM     TSTM WND DMG     1 ENE SPRING CHURCH     40.61N  79.47W
06/21/2021                   ARMSTRONG          PA   SOCIAL MEDIA

            VIDEO OF TREES COMING DOWN FROM WIND

0340 PM     TSTM WND DMG     PITTSBURGH              40.44N  79.98W
06/21/2021                   ALLEGHENY          PA   SOCIAL MEDIA

            LARGE TREE BLOCKING THE BOULEVARD OF THE ALLIES

&&

EVENT NUMBER PBZ2101755
EVENT NUMBER PBZ2101756

AMILLER

Local storm report, Jun 21, 4:09 PM EDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
409 PM EDT MON JUN 21 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0305 PM     TSTM WND DMG     GABBY HEIGHTS           40.15N  80.26W
06/21/2021                   WASHINGTON         PA   911 CALL CENTER

            TREE AND WIRES DOWN

&&

EVENT NUMBER PBZ2101757

07

Local storm report, Jun 21, 4:10 PM EDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE PITTSBURGH PA
410 PM EDT MON JUN 21 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0305 PM     TSTM WND DMG     SEWICKLEY               40.54N  80.18W
06/21/2021                   ALLEGHENY          PA   911 CALL CENTER

            TREE AND WIRES DOWN

&&

CORRECTED COUNTY/STATE...LOCATION

EVENT NUMBER PBZ2101757

07

Local storm report, Jun 21, 4:15 PM EDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
415 PM EDT MON JUN 21 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0404 PM     TSTM WND DMG     WHITE OAK               40.34N  79.80W
06/21/2021                   ALLEGHENY          PA   911 CALL CENTER

            SOME SIDING BLOWN OFF HOUSE

&&

EVENT NUMBER PBZ2101758

07

Local storm report, Jun 21, 4:18 PM EDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
418 PM EDT MON JUN 21 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0345 PM     TSTM WND DMG     LAWRENCEVILLE           40.47N  79.96W
06/21/2021                   ALLEGHENY          PA   PUBLIC

            LARGE TREE LIMBS DOWN

&&

EVENT NUMBER PBZ2101759

07

The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 21, 1:24 PM EDT	Special Weather Statement	PBZ	Marion	36 min
Jun 21, 1:51 PM EDT	Special Weather Statement	PBZ	Preston	24 min
Jun 21, 1:57 PM EDT	Severe Thunderstorm Warning	PBZ	Hancock	48 min
Jun 21, 2:08 PM EDT	Severe Thunderstorm Warning	PBZ	Preston	22 min
Jun 21, 2:21 PM EDT	Severe Thunderstorm Warning	PBZ	Hancock	24 min
Jun 21, 2:37 PM EDT	Severe Thunderstorm Warning	PBZ	Hancock	23 min
Jun 21, 3:00 PM EDT	Severe Thunderstorm Warning	PBZ	Brooke, Hancock, Ohio	30 min
Jun 21, 3:29 PM EDT	Severe Thunderstorm Warning	PBZ	Brooke, Ohio	46 min
Jun 21, 3:53 PM EDT	Severe Thunderstorm Warning	PBZ	Brooke, Marshall, Ohio	37 min
Jun 21, 4:57 PM EDT	Severe Thunderstorm Warning	PBZ	Marshall	29 min
Jun 21, 5:05 PM EDT	Areal Flood Advisory	PBZ	Marshall	3 hr
Jun 21, 5:08 PM EDT	Areal Flood Advisory	PBZ	Marion, Monongalia, Preston, Wetzel	3 hr
Jun 21, 5:41 PM EDT	Special Weather Statement	PBZ	Marion, Monongalia	34 min
Jun 21, 6:07 PM EDT	Severe Thunderstorm Warning	PBZ	Marion, Monongalia, Preston	23 min
Jun 21, 6:12 PM EDT	Areal Flood Advisory	PBZ	Marshall, Ohio	2 hr
Jun 21, 6:26 PM EDT	Special Weather Statement	PBZ	Preston	34 min
Jun 21, 6:39 PM EDT	Areal Flood Advisory	PBZ	Brooke, Marshall, Ohio	2 hr
Jun 21, 6:56 PM EDT	Flash Flood Warning	PBZ	Monongalia	2 hr
Jun 21, 7:46 PM EDT	Areal Flood Warning	PBZ	Marion, Monongalia, Preston, Wetzel	3 hr
Jun 21, 7:27 AM EDT	Special Weather Statement	PBZ	Columbiana	33 min
Jun 21, 1:09 PM EDT	Special Weather Statement	PBZ	Carroll, Columbiana, Coshocton, Tuscarawas	36 min
Jun 21, 1:33 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Columbiana, Tuscarawas	27 min
Jun 21, 1:45 PM EDT	Special Weather Statement	PBZ	Carroll, Coshocton, Tuscarawas	30 min
Jun 21, 2:33 PM EDT	Special Weather Statement	PBZ	Harrison, Jefferson	42 min
Jun 20, 8:55 PM EDT	Special Weather Statement	PBZ	Armstrong	20 min
Jun 21, 2:15 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer, Venango	30 min
Jun 21, 2:45 PM EDT	Severe Thunderstorm Warning	PBZ	Forest, Venango	30 min
Jun 21, 2:51 PM EDT	Tornado Warning	PBZ	Allegheny, Beaver, Butler	9 min
Jun 21, 2:55 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Beaver, Butler, Westmoreland	35 min
Jun 21, 2:58 PM EDT	Tornado Warning	PBZ	Allegheny, Butler	17 min
Jun 21, 3:21 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Indiana, Westmoreland	24 min
Jun 21, 3:25 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Westmoreland	35 min
Jun 21, 3:37 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Jefferson, Westmoreland	23 min
Jun 21, 3:45 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Westmoreland	45 min
Jun 21, 3:47 PM EDT	Special Weather Statement	PBZ	Washington	28 min
Jun 21, 3:55 PM EDT	Areal Flood Advisory	PBZ	Allegheny, Westmoreland	111 min
Jun 21, 3:55 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Westmoreland	35 min
Jun 21, 3:57 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Jefferson	33 min
Jun 21, 4:05 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	25 min
Jun 21, 4:13 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	32 min
Jun 21, 4:18 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington, Westmoreland	27 min
Jun 21, 4:27 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	33 min
Jun 21, 4:28 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	32 min
Jun 21, 4:41 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington, Westmoreland	49 min
Jun 21, 4:43 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	32 min
Jun 21, 5:03 PM EDT	Tornado Warning	PBZ	Greene	6 min
Jun 21, 6:43 PM EDT	Special Weather Statement	PBZ	Fayette	32 min
Jun 21, 7:23 PM EDT	Flash Flood Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	3 hr

Nearby

Severe Thunderstorm Warnings in West Virginia, 2021 Severe Thunderstorm Warnings in Ohio, 2021 Severe Thunderstorm Warnings in Pennsylvania, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.