Mark Brady. Drawings & Pictures 1790–1890: Recent Acquisitions. Exh. cat., W. M. Brady & Co. New York, 1996, unpaginated, no. 2, ill. (color), dates it to the artist's Roman period, between 1785 and 1801–6.
Philip Conisbee. "La peinture de plein air avant Corot." Corot, un artiste et son temps. Paris, 1998, pp. 361, 364 n. 27, p. 371 (fig. 10), notes that the inscription on the verso indicates that, contrary to advice Denis offered to Granet, this work was not painted directly from nature, adding that the motif of the surprised horseman is drawn from sources at least as early as the time of Poussin.
Anna Ottani Cavina. Paysages d'Italie: Les peintres du plein air (1780–1830). Exh. cat., Galeries Nationales du Grand Palais. Paris, 2001, pp. 128–29, no. 82, ill. (color).
Valentina Branchini. "Simon Denis (1755–1813) in Italia: Dipinti e Disegni di Paesaggio." PhD diss., Università di Bologna, 2002–3, pp. 16, 27, 118, 121–22, no. 51, ill., calls it "Temporale sulla campagna romana"; compares the inscription on the verso to one on a drawing by Denis (sale, Sotheby's, Monaco, June 18–19, 1992, part of no. 183, ill.).
Cara Dufour Denison in The Thaw Collection: Master Drawings and Oil Sketches, Acquisitions Since 1994. Exh. cat., Pierpont Morgan Library. New York, 2002, pp. 164–65, no. 74, ill. (color), notes that, according to the inscription on the verso, the sketch is based on an earlier drawing.
Esther Bell. "Catalogue Raisonné of the Thaw Collection." Studying Nature: Oil Sketches from the Thaw Collection. New York, 2011, p. 116, no. 43, ill. (color), calls it "Landscape near Rome During a Storm".
Geneviève Lacambre. "Two Series of Studies in Oil on Paper Numbered by Pierre-Henri de Valenciennes and Simon Denis." Studying Nature: Oil Sketches from the Thaw Collection. New York, 2011, pp. 74–75, 81, no. 46, figs. 57, 57 verso, and ill. p. 64 (color, overall and detail), calls it "Landscape near Rome During a Storm" and deduces that the number 46 on the verso situates it within the range of works similarly inscribed 38 through 74, whose primary motif is the sky.