Alert archive / Missouri / Tornado Warnings in 2017

Tornado Warning 21, NWS Kansas City, MO

April 15, 2017Atchison County, Missouri

NWS Kansas City, MO issued this tornado warning at Apr 15, 2017, 6:55 PM CDT for Atchison County, Missouri. It was in force for 20 min. 1 report 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: Apr 15, 2017, 6:55 PM CDT (23:55 UTC)
Expired: Apr 15, 2017, 7:15 PM CDT
In force: 20 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

County Atchison County, MO

The radar

The Omaha radar (KOAX), 106 km from the middle of the area, began a volume at 23:58 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
Apr 15, 7:15 PM CDT	FUNNEL CLOUD	8 N Rockport, MO

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 15, 5:05 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.9 hours before the alert went out and 106 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1748 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: -118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

499 
WFUS53 KEAX 152355
TOREAX
MOC005-160015-
/O.NEW.KEAX.TO.W.0021.170415T2355Z-170416T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Kansas City/Pleasant Hill MO
655 PM CDT SAT APR 15 2017

The National Weather Service in Pleasant Hill has issued a

* Tornado Warning for...
  Northwestern Atchison County in northwestern Missouri...

* Until 715 PM CDT
    
* At 654 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Hamburg, or 16 miles northwest of Tarkio, moving
  east at 20 mph.

  HAZARD...Tornado and half dollar size hail. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* Locations impacted include...
  Watson.

This includes Interstate 29 between mile markers 116 and 123.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Pleasant Hill.

&&

LAT...LON 4058 9550 4045 9555 4051 9569 4052 9566
      4054 9565 4056 9567 4056 9569 4052 9571
      4053 9573 4059 9573
TIME...MOT...LOC 2354Z 275DEG 19KT 4056 9565 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

LG

The office that day

Everything else NWS Kansas City, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 15, 6:29 PM CDT	Severe Thunderstorm Warning	EAX	Atchison	46 min

Nearby

Tornado Warnings in Missouri, 2017 Every tornado warning in 2017 Tornadoes 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.