Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 269, NWS Tulsa, OK

May 18, 20177 counties in Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 18, 2017, 10:22 PM CDT for 7 counties in Oklahoma. It was in force for 38 min. 13 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: May 18, 2017, 10:22 PM CDT (03:22 UTC)
Expired: May 18, 2017, 11:00 PM CDT
In force: 38 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cherokee County, OK, Mayes County, OK, Muskogee County, OK, Okmulgee County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Tulsa radar (KINX), 25 km from the middle of the area, began a volume at 03:24 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
May 18, 10:30 PM CDT	TSTM WND GST 67	5 Sse Haskell, OK
May 18, 10:34 PM CDT	TORNADO	5 S Redbird, OK	A TORNADO UPROOTED TREES...BLEW OVER A CENTER PIVOT IRRIGATION SYSTEM...AND SNAPPED POWER POLES.
May 18, 10:34 PM CDT	TORNADO	5 S Redbird, OK	A TORNADO UPROOTED TREES...BLEW OVER A CENTER PIVOT IRRIGATION SYSTEM...AND SNAPPED POWER POLES. BASED ON THIS DAMAGE...THE RATING IS EF-1.
May 18, 10:37 PM CDT	TSTM WND DMG	Porter, OK	WAGONER COUNTY EM REPORTS AT LEAST 2 TO 3 MOBILE HOMES WERE OVERTURNED.
May 18, 10:39 PM CDT	TSTM WND GST 86	Porter, OK
May 18, 10:40 PM CDT	TORNADO	1 E Porter, OK	A TORNADO DESTROYED OUTBUILDINGS...ROLLED MOBILE HOMES...UPROOTED TREES...DAMAGED HOMES...AND BLEW DOWN POWER POLES.
May 18, 10:40 PM CDT	TORNADO	1 E Porter, OK	A TORNADO DESTROYED OUTBUILDINGS...ROLLED MOBILE HOMES...UPROOTED TREES...DAMAGED HOMES...AND BLEW DOWN POWER POLES. BASED ON THIS DAMAGE...THE RATING IS EF-1.
May 18, 10:43 PM CDT	TSTM WND DMG	4 Ne Porter, OK	BARN DESTROYED
May 18, 10:46 PM CDT	TSTM WND DMG	Wagoner, OK	WAGONER COUNTY EM REPORTED SEVERAL HOMES DAMAGED IN WAGONER. SEVERAL BUSINESSES IN DOWNTOWN WAGONER HAD MINOR DAMAGE AS WELL.
May 18, 10:50 PM CDT	TSTM WND DMG	Wagoner, OK	CAR FLIPPED, DAMAGE TO PHILLIPS 66 GAS STATION. POSSIBLE TORNADO
May 18, 10:52 PM CDT	TORNADO	4 Ese Wagoner, OK	A TORNADO DAMAGED HOMES...DESTROYED OUTBUILDINGS...AND UPROOTED OR SNAPPED NUMEROUS TREES.
May 18, 10:52 PM CDT	TORNADO	4 Ese Wagoner, OK	A TORNADO DAMAGED HOMES...DESTROYED OUTBUILDINGS...AND UPROOTED OR SNAPPED NUMEROUS TREES. BASED ON THIS DAMAGE...THE RATING IS EF-1.
May 18, 10:52 PM CDT	TORNADO	6 Wsw Hulbert, OK	A TORNADO DAMAGED HOMES...SNAPPED AND UPROOTED TREES...DESTROYED OUTBUILDINGS...AND BLEW DOWN POWER POLES. BASED ON THIS DAMAGE...THE RATING IS EF-1.

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 6 storm reports to this severe thunderstorm warning; the first came 8 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
May 18, 6:02 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 3.4 hours before the alert went out and 202 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: 2055 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1439 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

369 
WUUS54 KTSA 190322
SVRTSA
OKC021-097-101-111-131-143-145-190400-
/O.NEW.KTSA.SV.W.0269.170519T0322Z-170519T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
1022 PM CDT THU MAY 18 2017

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Southwestern Rogers County in northeastern Oklahoma...
  Southwestern Mayes County in northeastern Oklahoma...
  Wagoner County in northeastern Oklahoma...
  West central Cherokee County in east central Oklahoma...
  Northwestern Muskogee County in east central Oklahoma...
  Northeastern Okmulgee County in northeastern Oklahoma...
  Southeastern Tulsa County in northeastern Oklahoma...

* Until 1100 PM CDT

* At 1022 PM CDT, severe thunderstorms were located along a line
  extending from Tulsa to 2 miles west of Stonebluff, moving east at
  40 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations in or near the path include...
  Tulsa...                          Broken Arrow...
  Muskogee...                       Sand Springs...
  Claremore...                      Wagoner...
  Owasso...                         Bixby...
  Jenks...                          Coweta...
  Catoosa...                        Verdigris...
  Haskell...                        Inola...
  Okay...                           Hulbert...
  Porter...                         Taft...
  Tullahassee...                    Stonebluff...

This includes Interstate 44 between mile markers 217 and 252.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until midnight CDT for northeastern
and east central Oklahoma...and east central Oklahoma.

LAT...LON 3587 9508 3566 9577 3605 9603 3607 9603
      3607 9605 3614 9609 3616 9604 3616 9600
      3618 9600 3636 9558
TIME...MOT...LOC 0322Z 249DEG 35KT 3611 9597 3590 9577 

HAIL...1.00IN
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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 18, 9:19 PM CDT, 1 hour 3 minutes earlier.

Area forecast discussion, May 18, 9:19 PM CDT, 1 hour 3 minutes before

Area Forecast Discussion
National Weather Service Tulsa OK
919 PM CDT Thu May 18 2017

...UPDATE...

.DISCUSSION...
Strong to severe thunderstorms continue this evening with heavy
rainfall occurring in the stronger clusters. A marginal wind/hail
threat will likely persist into the overnight hours as storms
progress eastward into instability axis. In addition, given the
rainfall rates, the threat for localized flash flooding will also
be possible.

A quick look at the latest 00Z NAM indicates another round of
severe thunderstorms late Friday afternoon into Friday night.
Flash flooding could become a major concern, especially given the
rainfall that is ongoing. Update out shortly given latest radar
trends.

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...Flash Flood Watch through Saturday morning for OKZ054>067-070-
     071.

AR...None.
&&

SHORT TERM...12

Hazardous weather outlook, May 18, 4:55 PM CDT, 5 hours 27 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
455 PM CDT Thu May 18 2017

ARZ001-002-010-011-019-020-029-OKZ049-053>076-191145-
Adair OK-Benton AR-Carroll AR-Cherokee OK-Choctaw OK-Craig OK-
Crawford AR-Creek OK-Delaware OK-Franklin AR-Haskell OK-Latimer OK-
Le Flore OK-Madison AR-Mayes OK-McIntosh OK-Muskogee OK-Nowata OK-
Okfuskee OK-Okmulgee OK-Osage OK-Ottawa OK-Pawnee OK-Pittsburg OK-
Pushmataha OK-Rogers OK-Sebastian AR-Sequoyah OK-Tulsa OK-Wagoner OK-
Washington OK-Washington AR-
455 PM CDT Thu May 18 2017

...SEVERE STORM POTENTIAL INCREASES THIS EVENING AND CONTINUES
INTO FRIDAY...

This Outlook is for Northwest and West Central Arkansas as well as
much of Eastern Oklahoma.

.DAY ONE...This evening through Tonight.

TORNADO.
	RISK...Limited.
 	AREA...West of highway 75.
    ONSET...after 6 PM.

SEVERE THUNDERSTORM.
	RISK...Elevated.
	AREA...Eastern Oklahoma and to a lesser extent Northwest Arkansas.
	ONSET...after 6 PM.

FLASH FLOOD.
	RISK...Limited.
	AREA...Northeast Oklahoma.
	ONSET...after midnight.

HEAVY RAIN.
	RISK...Elevated.
	AREA...Northeast Oklahoma.
	ONSET...after 6 PM.

SIGNIFICANT WINDS.
	RISK...Limited.
	AREA...Eastern Oklahoma and Western Arkansas.
	ONSET...ongoing.

DISCUSSION...

An enhanced to moderate risk of severe storms is forecast by early
evening into tonight across Eastern Oklahoma. Very large hail, in
excess of 2 inches in diameter, damaging winds and isolated
tornadoes are possible, with the greatest risk northwest of Tulsa. A
slight risk of severe storms is forecast for Western Arkansas late
tonight. Damaging winds and marginally severe hail would be the main
threats, mainly after midnight.

Strong to severe storms have develop this afternoon over western and
central Oklahoma.  These storms are expected to move east into the
region early this evening. The best chance for discrete surface
based cells, and thus the highest tornado and largest hail threat,
will be to the west of highway 75 this evening.

Storms are expected to gradually grow into clusters or lines this
evening as they move deeper into Eastern Oklahoma. Damaging winds
and large hail would be the main threats. An isolated tornado could
occur with any bowing line segments.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
Activation of the Regional Spotter Network Expected.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
FRIDAY and SATURDAY...Severe Thunderstorm Potential...High Wind
                        Potential...Heavy Rain Potential.
SUNDAY...No Hazards.
MONDAY...Severe Thunderstorm Potential.
TUESDAY...Thunderstorm Potential.
WEDNESDAY...No Hazards.

EXTENDED DISCUSSION...

Another round of strong to severe storms are expected Friday into
early Saturday as upper level system approaches the region.
Storms will fire along the dryline and cold front, becoming more
numerous with time. All modes of severe will be possible,
especially early when storms are more discrete, with storms again
merging into a line as they move east. Severe threat will
transition to more of a wind and heavy rain/flooding threat as
the night goes on. Convection will linger into Saturday while
gradually weakening, across northwest Arkansas and southeast
Oklahoma.

A system dropping through the region in northwest flow will bring
another round of storm potential Monday and Tuesday. A limited
risk for severe weather can be expected with this system.

weather.gov/tulsa Contains additional information.

In the hours before

Local storm report, May 18, 9:39 PM CDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
939 PM CDT THU MAY 18 2017

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

0930 PM     TSTM WND GST     TULSA                   36.13N 95.92W
05/18/2017  E70 MPH          TULSA              OK   BROADCAST MEDIA

            TULSA HILLS

&&

JDS

Local storm report, May 18, 9:47 PM CDT, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
947 PM CDT THU MAY 18 2017

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

0939 PM     TSTM WND GST     4 NE TULSA              36.17N 95.87W
05/18/2017  M65 MPH          TULSA              OK   MESONET

&&

JDS

Local storm report, May 18, 10:02 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1002 PM CDT THU MAY 18 2017

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

0945 PM     HAIL             4 NE PRYOR              36.35N 95.27W
05/18/2017  E0.75 INCH       MAYES              OK   EMERGENCY MNGR

&&

JDS

Local storm report, May 18, 10:12 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1012 PM CDT THU MAY 18 2017

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

1005 PM     TSTM WND GST     2 S WYNONA              36.52N 96.33W
05/18/2017  M59 MPH          OSAGE              OK   MESONET

&&

JDS

Local storm report, May 18, 10:14 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1014 PM CDT THU MAY 18 2017

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

1010 PM     HAIL             OOLOGAH                 36.45N 95.71W
05/18/2017  E0.75 INCH       ROGERS             OK   PUBLIC

1009 PM     TSTM WND DMG     HANNA                   35.21N 95.89W
05/18/2017                   MCINTOSH           OK   BROADCAST MEDIA

            POWER LINES DOWN.

0953 PM     TSTM WND DMG     4 S SPERRY              36.24N 95.99W
05/18/2017                   TULSA              OK   PUBLIC

            TREE UPROOTED IN TURLEY.

0933 PM     TSTM WND GST     1 NW JENKS              36.03N 95.98W
05/18/2017  M62 MPH          TULSA              OK   ASOS

            MEASURED AT RIVERSIDE AIRPORT.

&&

KAH

Local storm report, May 18, 10:22 PM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1022 PM CDT THU MAY 18 2017

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

1015 PM     TSTM WND GST     4 WNW EUFAULA           35.31N 95.65W
05/18/2017  M66 MPH          MCINTOSH           OK   MESONET

&&

JDS

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 18, 7:17 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	43 min
May 18, 7:43 PM CDT	Special Weather Statement	TSA	Osage	32 min
May 18, 8:00 PM CDT	Special Weather Statement	TSA	Creek, Tulsa	45 min
May 18, 8:06 PM CDT	Special Weather Statement	TSA	Okfuskee	24 min
May 18, 8:10 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Rogers, Tulsa	35 min
May 18, 8:33 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	42 min
May 18, 8:42 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Rogers, Tulsa, Wagoner, Washington	48 min
May 18, 9:05 PM CDT	Areal Flood Advisory	TSA	Creek, Okfuskee, Okmulgee, Tulsa	115 min
May 18, 9:06 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okmulgee, Osage, Pawnee, Tulsa, Wagoner	24 min
May 18, 9:12 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee	48 min
May 18, 9:26 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okmulgee, Osage, Rogers, Tulsa, Wagoner and 1 more	49 min
May 18, 9:35 PM CDT	Special Weather Statement	TSA	Craig, Nowata	25 min
May 18, 9:40 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Pittsburg	65 min
May 18, 9:48 PM CDT	Tornado Warning	TSA	Pittsburg	42 min
May 18, 9:54 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Muskogee, Okfuskee, Okmulgee	36 min
May 18, 10:00 PM CDT	Tornado Warning	TSA	McIntosh	30 min
May 18, 10:18 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Haskell, Latimer, McIntosh, Muskogee, Pittsburg and 1 more	57 min
May 18, 10:23 PM CDT	Tornado Warning	TSA	Muskogee, Wagoner	37 min
May 18, 10:28 PM CDT	Tornado Warning	TSA	Cherokee, McIntosh, Muskogee, Sequoyah	47 min
May 18, 10:37 PM CDT	Tornado Warning	TSA	Cherokee, Mayes, Muskogee, Wagoner	38 min
May 18, 10:42 PM CDT	Areal Flood Advisory	TSA	Rogers	3 hr
May 18, 10:57 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Delaware, Haskell, LeFlore, Mayes and 3 more	48 min
May 18, 11:00 PM CDT	Tornado Warning	TSA	Adair, Cherokee	45 min
May 18, 11:01 PM CDT	Tornado Warning	TSA	Cherokee, Delaware, Mayes, Wagoner	44 min
May 18, 11:12 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Mayes, Ottawa, Rogers	48 min
May 18, 11:12 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore, Pittsburg, Pushmataha	48 min
May 18, 11:31 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Delaware, Sequoyah	59 min
May 18, 11:32 PM CDT	Tornado Warning	TSA	Delaware	43 min
May 18, 11:34 PM CDT	Tornado Warning	TSA	Adair, Delaware	41 min
May 18, 11:42 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Pittsburg	48 min
May 18, 11:48 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	42 min
May 18, 11:58 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, LeFlore, Pittsburg, Pushmataha	62 min
May 19, 2:16 AM CDT	Special Weather Statement	TSA	Pawnee	44 min
May 19, 3:26 AM CDT	Special Weather Statement	TSA	Tulsa	34 min
May 19, 3:58 AM CDT	Special Weather Statement	TSA	Tulsa	32 min
May 19, 8:46 AM CDT	River Flood Warning	TSA	Osage	23 hr
May 19, 8:46 AM CDT	River Flood Warning	TSA	Osage, Tulsa	62 hr
May 19, 8:46 AM CDT	River Flood Warning	TSA	Tulsa	71 hr
May 19, 8:46 AM CDT	River Flood Warning	TSA	Creek	38 hr
May 19, 8:56 AM CDT	River Flood Warning	TSA	Washington	71 hr
May 19, 8:56 AM CDT	River Flood Warning	TSA	Rogers, Tulsa	4 days
May 19, 8:56 AM CDT	River Flood Warning	TSA	Ottawa	5 days
May 19, 10:57 AM CDT	Special Weather Statement	TSA	Tulsa	33 min
May 19, 11:07 AM CDT	Special Weather Statement	TSA	Osage	23 min
May 19, 1:18 PM CDT	Special Weather Statement	TSA	Muskogee	27 min
May 19, 1:47 PM CDT	Special Weather Statement	TSA	Cherokee, Delaware, Mayes	43 min
May 19, 2:10 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Delaware, Mayes	26 min
May 19, 2:21 PM CDT	River Flood Advisory	TSA	Cherokee	3 days
May 19, 2:34 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Delaware	41 min
May 19, 3:46 PM CDT	Special Weather Statement	TSA	Adair	29 min
May 19, 4:03 PM CDT	Special Weather Statement	TSA	Okfuskee, Okmulgee	27 min
May 19, 4:18 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee, Tulsa, Wagoner	42 min
May 19, 4:42 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee	48 min
May 19, 5:01 PM CDT	Special Weather Statement	TSA	Wagoner	29 min
May 19, 5:15 PM CDT	Special Weather Statement	TSA	Mayes, Okmulgee, Wagoner	30 min
May 19, 5:16 PM CDT	Areal Flood Advisory	TSA	Creek, Mayes, Muskogee, Okfuskee, Okmulgee, Rogers and 2 more	119 min
May 19, 5:20 PM CDT	Severe Thunderstorm Warning	TSA	Delaware, Mayes	2 min
May 19, 5:24 PM CDT	Severe Thunderstorm Warning	TSA	Delaware, Mayes	51 min
May 19, 6:04 PM CDT	Flash Flood Warning	TSA	Creek, Okfuskee, Okmulgee	8 hr
May 19, 6:15 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Delaware, Mayes, Muskogee, Ottawa, Wagoner	60 min
May 19, 6:19 PM CDT	Special Weather Statement	TSA	Okfuskee	26 min
May 19, 6:28 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee	62 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.